Patient data are sorted by mutation combination frequency.

Reference:	Ashley et al, 2008; [PubMed] 1
Description:	Epilepsy, ataxia
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 16, Age of Patient: n/a, Age of Death: n/a

Reference:	Stewart et al, 2009; [PubMed] 2
Description:	Alpers, Encephalopathy, liver failure.
Mutations:	A467T, A467T
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: n/a

Reference:	Stewart et al, 2009; [PubMed] 3
Description:	PEO, ataxia, ataxic sensory axonal neuropathy, dysarthria, multiple mtDNA deletions. 10% COX deficient fibers, 2% RRF.
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 30, Age of Patient: n/a, Age of Death: n/a

Reference:	Stewart et al, 2009; [PubMed] 4
Description:	PEO, ataxia, seizures, encephalopathy, ptosis, sensory neuropathy, mtDNA multiple deletions. 20% COX deficient fibers, 3% ragged red fibers.
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 12, Age of Patient: n/a, Age of Death: n/a

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Reference:	Tang et al, 2011; [PubMed] 5
Description:	Age 19.6, developmental delay, after 18 years, rapid onset of muscle weakness, ataxia, myoclonic seizures, optic atrophy, diplopia, dysarthria. 102% mtDNA copy number in blood.
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 18, Age of Patient: 20, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 6
Description:	Ataxia, peripheral neuropathy, muscle weakness, easy fatigability, CPEO, abnormal EMG/NCV, ptosis, delayed gastric emptying, diarrhoea, constipation, lactic acidosis, abnormal muscle ultratstructure, ragged red fibers. 75% mtDNA copy number in blood.
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: n/a, Age of Patient: 46, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 7
Description:	Stroke/ischaemic episodes, ataxia, seizures, myoclonic seizures, peripheral neuropathy, CPEO. 114% mtDNA copy number in blood.
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: n/a, Age of Patient: 40, Age of Death: n/a

Reference:	Winterthun et al, 2005; [PubMed] 8
Description:	At age 17, she had an epileptic seizure preceded by tiredness and blurred vision. Visual blurring and poor memory persisted and 5 days later she developed status epilepticus with a focal start in the right arm. Examination showed horizontal nystagmus that did not settle, normal eye movements, and normal peripheral findings except that the deep tendon reflexes were recorded as weak. She returned 3 years later at age 20 with headache and unsteadiness. myoclonus and progressive ophthalmoplegia, ataxia, frequent myoclonic jerks. Cognitive dysfunction, axonal neuropathy.
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 17, Age of Patient: 49, Age of Death: n/a

Reference:	Winterthun et al, 2005; [PubMed] 9
Description:	Headache, tremor, sensory ataxia, dysarthria, nystagmus, ophthalmoplegia, cognitive dysfunction, axonal neuropathy, demyelinating neuropathy. She had headaches with preceding visual symptoms diagnosed as migraine that started at age 16. Episodic, involuntary jerking movements involving head and hands developed soon after. At age 18 she had two tonic clonic seizures preceded by poor concentration, confusion, and increased involuntary movements. Examination recorded titubation and myoclonus of the arms diminished reflexes in the legs, and reduced proprioception at the hallux. She has recurrent seizures and frequent headaches. At age 26 cerebellar and sensory ataxia, dysarthria, limita- tion of horizontal and vertical eye movements, and absent reflexes were recorded. COX negative fibers. At age 37 she was admitted with status epilepticus preceded by headache and visual symptoms in the right visual field. She remains ataxic but ambulant with assistance.
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 16, Age of Patient: 39, Age of Death: n/a

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Reference:	Winterthun et al, 2005; [PubMed] 10
Description:	Headache, tremor. At age 20, he developed unsteadiness and dizziness. Examination showed upper limb tremor and myoclonus, and titubation. At age 31 limitation of horizontal eye movements was recorded; muscle biopsy was reported as showing no ragged red fibers. Subsequently, he developed limb and truncal ataxia, worsening ophthalmoplegia, pain in his extremities with glove and stocking sensory loss, particularly affecting proprioception, and sudden falls with altered consciousness that responded to anticonvulsant treatment. Sensory ataxia. axonal neuropathy, ophthalmoplegia, demyelination neuropathy, cognitive dysfunction, focal occipital epilepsy.
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 10, Age of Patient: 43, Age of Death: n/a

Reference:	Winterthun et al, 2005; [PubMed] 11
Description:	This man developed epilepsy at age 5. At age 16 he developed unsteadiness and was euphoric. He had a right-sided divergent squint and difficulties on upgaze when the right eye would drift outward. Eye movements were otherwise full. There were horizontal nystagmus, absent tendon reflexes, and loss of proprioception distally in the legs. His gait was ataxic. Positive Romberg sign. At age 20 mild dysarthria was noted. Subsequently, he developed finger dysmetria, dysdiadochokinesis and myoclonus involving his arms, diarrhea, weight loss and cachexia, and ophthalmoplegia. Between the ages of 35 and 54 years he had infrequent seizures, but at age 55 he developed treatment-resistant status epilepticus and died. Cognitive dysfunction, axonal neuropathy, status epilepticus.
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 5, Age of Patient: n/a, Age of Death: 55

Reference:	Wong et al, 2008; [PubMed] 12
Description:	Onset 23 years with ataxia, neuropathy, hearing loss, seizures, and VPA liver failure. From "Saneto et al, 2010": Sensory neuropathy, ataxia, seizure onset at 15 years, simple partial seizure and epilepsia partialis continua myoclonus, VPA treatment caused liver failure after 3 months, progressive encephalopathy, Sensorineural hearing loss, dysmetria, intention tremor, hypotonia
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 15, Age of Patient: 23, Age of Death: 23.5

Reference:	Wong et al, 2008; [PubMed] 13
Description:	Onset 32 years with neuropathy, myopathy, SANDO, PEO.
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 32, Age of Patient: n/a, Age of Death: n/a

Reference:	Nguyen et al, 2005; [PubMed] 14
Description:	Refractory seizures, psychomotor regression, liver disease, presented with epilepsia partialis continua, Transient lactic acidemia
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 8.5, Age of Patient: n/a, Age of Death: 9

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Reference:	Milone et al, 2011; [PubMed] 15
Description:	progressive bilateral ptosis, limited eye movements, lower extremities paresthesias, and unsteadiness, Multiple mtDNA deletions detected by PCR in muscle
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 31, Age of Patient: 34, Age of Death: n/a

Reference:	Wolf et al, 2009; [PubMed] 16
Description:	Developemental delay, status epilepticus onset, valproic acid therapy 2 weeks, epilepsia partialis continua, mtDNA depletion in liver
Mutations:	A467T, A467T
Age group:	infantile
Age of Onset: 2.67, Age of Patient: 6, Age of Death: n/a

Reference:	Wolf et al, 2009; [PubMed] 17
Description:	status epilepticus onset, valproic acid therapy 12 weeks, liver failure,
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 9.25, Age of Patient: 11, Age of Death: n/a

Reference:	McHugh et al, 2010; [PubMed] 18
Description:	progressive difficulty walking, hand and foot numbness, ataxia, dysarthria, ptosis, sensory ataxia, with progressive ophthalmoplegia, dysarthria, nystagmus, dysphagia. Dysarthria became evident from age 55 years, and she developed ptosis at 62 years.
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 42, Age of Patient: 62, Age of Death: n/a

Reference:	McHugh et al, 2010; [PubMed] 19
Description:	progressive imbalance, hand and foot numbness, with impotence and dysarthria, progressive diplopia, bilateral ptosis with severe ophthalmoparesis in all directions and diplopia on lateral gaze. There was mild dysarthria and severe sensory ataxia, mild weakness in proximal and distal muscle groups, myopathy, multiple mtDNA deletions in muscle.
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 41, Age of Patient: 46, Age of Death: n/a

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Reference:	Brinjikji et al, 2011; [PubMed] 20
Description:	Elevated CSF protein, occipital stroke, visual field deficit, peripheral neuropathy, migraine, epilepsy, ataxia, myoclonus, progressive gait ataxia, ophthalmoplegia, dysarthria, dysphagia, valproate induced encephalopathy and depression
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 18, Age of Patient: 39, Age of Death: n/a

Reference:	Brinjikji et al, 2011; [PubMed] 21
Description:	Hospitalized at age 7 for headache, fever, lethargy, and seizures, Elevated CSF protein, occipital stroke, visual field deficit, peripheral neuropathy, migraine, epilepsy, The patient began valproate therapy at age 11 and suffered hepatic encephalopathy which resolved after carnitine therapy.
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 7, Age of Patient: 28, Age of Death: n/a

Reference:	Hunter et al, 2011; [PubMed] 22
Description:	Myoclonic Seizures, Focal motor seizures, Epilepsia partialis continua, Developmental Delay or Regression, Abnormal Liver Enzymes, Alpers
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 5, Age of Patient: n/a, Age of Death: 10.83

Reference:	Visser et al, 2011; [PubMed] 23
Description:	Migraine, seizures, dysphasia, magnesium infusion stopped the seizures
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 17, Age of Patient: n/a, Age of Death: n/a

Reference:	Visser et al, 2011; [PubMed] 24
Description:	Seizures, magnesium infusion stopped the seizures
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 19, Age of Patient: n/a, Age of Death: n/a

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Reference:	Tang et al, 2012; [PubMed] 25
Description:	ptosis, PEO, muscle weakness, fatigability, peripheral neuropathy, ataxia, lactic acidosis and diarrhea alternating with constipation, ragged-red fibers,
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: n/a, Age of Patient: 46, Age of Death: n/a

Reference:	Lax et al, 2012a; [PubMed] 26
Description:	CPEO, Ptosis, Peripheral neuropathy, COX-deficient fibers, presence of mitochondrial dna deletions in muscle, Severe sensory and moderate motor neuronopathy, Distal and proximal neurogenic change,
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 41, Age of Patient: 44, Age of Death: n/a

Reference:	Lax et al, 2012a; [PubMed] 27
Description:	CPEO, Ptosis, Peripheral neuropathy, COX-deficient fibers, ragged red fibers, presence of mitochondrial dna deletions in muscle, Sensory and motor neuronopathy, Distal neurogenic change, proximal myopathy.
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 18, Age of Patient: 36, Age of Death: n/a

Reference:	Tzoulis et al, 2006; [PubMed] 28
Description:	Presented with migraine like headaches, ataxia, epilepsy, status epilepticus, nystagmus, myoclonus, neuropathy
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 15, Age of Patient: 20, Age of Death: n/a

Reference:	Boes et al, 2009; [PubMed] 29
Description:	Presented with status epilepticus, cerebellar ataxia and myoclonus, epilepsia partialis continua, Transient liver dysfunction with sodium valproate treatment at age 15, refractory focal motor status at age 17,
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 5, Age of Patient: n/a, Age of Death: 17

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Reference:	Tzoulis et al, 2013; [PubMed] 30
Description:	Epilepsy, stroke-like episodes, ataxia, peripheral neuropathy, progressive external ophthalmoplegia (PEO).
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 16, Age of Patient: n/a, Age of Death: 53

Reference:	Tzoulis et al, 2013; [PubMed] 31
Description:	Epilepsy, ataxia, peripheral neuropathy, progressive external ophthalmoplegia (PEO).
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 15, Age of Patient: 42, Age of Death: n/a

Reference:	Hanisch et al, 2014; [PubMed] 32
Description:	Ataxia, ptosis, pareses, sensory neuropathy, motor neuropathy, axonal neuropathy
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 38, Age of Patient: 40, Age of Death: n/a

Reference:	Tzoulis et al, 2014; [PubMed] 33
Description:	Epilepsy, stroke-like episode, Ataxia, Neuropathy, PEO
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 8, Age of Patient: n/a, Age of Death: 47

Reference:	Tzoulis et al, 2014; [PubMed] 34
Description:	Epilepsy, stroke-like episode, Ataxia, Neuropathy, PEO
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 15, Age of Patient: n/a, Age of Death: 44

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Reference:	Tzoulis et al, 2014; [PubMed] 35
Description:	Epilepsy, stroke-like episode, Ataxia, Neuropathy, PEO
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 16, Age of Patient: n/a, Age of Death: 53

Reference:	Schicks et al, 2010; [PubMed] 36
Description:	early-onset ataxia, epilepsy, sensory neuropathy.
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 12.5, Age of Patient: n/a, Age of Death: n/a

Reference:	Van Goethem et al, 2004; [PubMed] 37
Description:	Increasing gait unsteadiness, mild cognitive decline in the fifth decade. Cataracts. ataxic gait. Deep tendon reflexes were absent. Vibration and position sense were absent at the lower limbs early on, whereas light touch sensation was decreased at a later stage. Pes Cavus. gaze paresis, nystagmus. axonal generalized peripheral neuropathy. brainstem dysfunction.
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: n/a, Age of Patient: 49, Age of Death: n/a

Reference:	Van Goethem et al, 2004; [PubMed] 38
Description:	Increasing gait unsteadiness. ataxic gait. Deep tendon reflexes were absent. Vibration and position sense were absent at the lower limbs early on, whereas light touch sensation was decreased at a later stage. Pes Cavus. Dysarthria. horizontal and vertical gaze-evoked nystagmus. axonal generalized peripheral neuropathy. brainstem dysfunction.
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: n/a, Age of Patient: 47, Age of Death: n/a

Reference:	Van Goethem et al, 2004; [PubMed] 39
Description:	at 18 year of age, he hadstatus epilepticus lasting 8 days, followed by a “Todd paralysis” of the left arm and face. Five years later, he had an acute psychiatric illness, hyperventilation, gastrointestinal symptoms, gait unsteadiness, and disturbed limb coordination. Between 32 and 35 years of age, he lost 13 kg of weight. On exami- nation, he had sensory gait ataxia, limb ataxia, areflexia, generalized dystrophy, and loss of vibration and static joint position sense at the distal lower limbs, severe dysarthria, and a left-sided Babinski sign. Romberg test was positive. intestinal pseudo-obstruction, anorexia, and further weight loss. A few weeks later, he developed stupor (Glasgow coma scale, 5/15), hyperventilation, myoclonic jerks, and seizures necessitating intensive care and artificial ventilation. gastroparesis. dilated cardiomyopathy.
Mutations:	A467T, A467T
Age group:	juvenile
Age of Onset: 18, Age of Patient: n/a, Age of Death: 39

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Reference:	Rajakulendran et al, 2016; [PubMed] 40
Description:	Alpers. Speech and motor delay were noted at the age of two years. At three years she developed epilepsy and six months later experienced migrainous attacks associated with vomiting, vertigo and transient left-sided weakness. At the age of five years she developed status epilepticus. A month later she was noted to have nystagmus, hypotonia of the lower limbs and absent knee jerks. Liver dysfunction.
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 3, Age of Patient: n/a, Age of Death: 5.5

Reference:	Rajakulendran et al, 2016; [PubMed] 41
Description:	MELAS. Occipital headaches. left homonymous hemianopia suggestive of a stroke-like episode. right occipital infarct. Jerking movements of her left arm suggestive of epilepsia partialis continua with dystonia, which was refractory to treatment. She developed an asymptomatic axonal neuropathy, deafness and myopathic weakness. bilateral ptosis, ophthalmoparesis, a dense left homonymous hemianopia, dysarthric speech, increased tone with clawing of the left hand, and distal muscle weakness. In addition, Romberg’s test was positive and she walked with a wide-based gait. ataxic gait. axonal sensory motor neuropathy. ragged red fibres and COX-negative fibres.
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 24, Age of Patient: 31, Age of Death: n/a

Reference:	Rajakulendran et al, 2016; [PubMed] 42
Description:	MEMSA. sensory neuropathy affecting legs. normal development until the age of 6 years when she presented with an encephalopathic illness consisting of impaired consciousness, vomiting and generalised tonic-clonic seizures. One week later she developed a left homonymous hemianopia. She remained stable until the age of 13 years when she developed stimulus sensitive myoclonus, tremor and a progressive cerebellar ataxia. Mildly elevated blood lactate and alanine levels and a sensory axonal peripheral neuropathy. occipital lobe infarcts. COX negative fibres. gaze-evoked nystagmus at 17. hand tremor, stimulus- sensitive myoclonus, head titubation, and gait ataxia.
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 6, Age of Patient: 16, Age of Death: n/a

Reference:	Rajakulendran et al, 2016; [PubMed] 43
Description:	SANDO. Severe axonal neuropathy. COX-negative fibres, ragged red fibres. presented at the age of 20 years with diplopia and bilateral ptosis. Over the next five years he developed dysphagia, slurred speech and an unsteady gait. tingling sensation in hands, feet, leg, trunk and arms. at 44 years demonstrated bilateral ptosis and limitation of eye movements in all directions of gaze. dysarthria. Romberg’s test was positive. ataxic gait. axonal sensory peripheral neuropathy. ragged red fibres and more than 10 COX-negative fibres.
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 20, Age of Patient: 44, Age of Death: n/a

Reference:	Janssen et al, 2016; [PubMed] 44
Description:	At 21 years, presented with a first generalized tonic–clonic seizure. She complained of migraine afterward and developed a convulsive status epilepticus. Visual hallucinations, jerking of the right arm with secondary generalization. She died 7 months after initial presentation.
Mutations:	A467T, A467T
Age group:	adult
Age of Onset: 21, Age of Patient: 21, Age of Death: 21.6

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Reference:	Janssen et al, 2016; [PubMed] 45
Description:	Sudden falls, frequent negative myoclonus, ataxic gait and loss of proprioception in the distal extremities with nerve conduction studies demonstrating a mild axonal sensory polyneuropathy. myoclonic status epilepticus, generalized tonic–clonic seizure.
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 12, Age of Patient: 18, Age of Death: 27

Reference:	Simonati et al, 2003a; [PubMed] 46
Description:	During his early childhood, he had frequent “acetonaemic vomiting” and stunted growth. At age 7 years, he developed EPC and sensory ataxia. epilepsia partialis continua, followed by progressive ataxia Reduced density of the white matter. behavioural problems. Elevated blood lactate. myoclonic seizures. sensory ataxia, absent deep tendon reflexes, cerebellar dysfunction, nystagmus, peripheral vision defect, and a pale optic disk. mild atrophy of the frontal,parietal and visual cortices, focal hyperlucencies of the frontal and occipital cortex, as well as of the thalamus bilaterally, and cerebellar atrophy. COX-negative fibres. partial and generalized seizures as well as myoclonic fits.
Mutations:	A467T, A467T
Age group:	childhood
Age of Onset: 7, Age of Patient: 18, Age of Death: 19

Reference:	Blok et al, 2009; [PubMed] 47
Description:	MELAS-like, features including occipital lobe epilepsy.
Mutations:	A467T, W748S
Age group:	juvenile
Age of Onset: n/a, Age of Patient: 19, Age of Death: n/a

Reference:	Blok et al, 2009; [PubMed] 48
Description:	Occipital lobe epilepsy, myoclonus, cognitive delay, polyneuropathy, cerebellar ataxia.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: n/a, Age of Patient: 40, Age of Death: n/a

Reference:	Blok et al, 2009; [PubMed] 49
Description:	Ptosis, CPEO, polyneuropathy, cerebellar ataxia, dysarthria.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	adult
Age of Onset: n/a, Age of Patient: 47, Age of Death: n/a

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Reference:	Horvath et al, 2006; [PubMed] 50
Description:	Onset at 34 years with PEO, ataxia, dysphagia, myopathy, neuropathy and Diabetes.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 34, Age of Patient: n/a, Age of Death: n/a

Reference:	Kollberg et al, 2006; [PubMed] 51
Description:	Started as an ataxic syndrome, Alpers, ragged red fibers, COX-deficient fibers, mtDNA deletions. mtDNA copy numbers 1.6 fold. She was healthy and developed normally until her late preschool years when she developed slowly progressive ataxia. Occasional myoclonic seizures, and at 13 years of age, valproate treatment was started because of occipital seizures. ataxia, dementia, and cortical blindness. She developed refractory seizures, including multifocal EPC, status epilepticus, and myoclonus.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	childhood
Age of Onset: 5, Age of Patient: 13, Age of Death: 14

Reference:	Kollberg et al, 2006; [PubMed] 52
Description:	psychomotor regression, refractory seizures, stroke-like episodes, hepatopathy, and ataxia. COX-deficient muscle fibers, mtDNA deletions, 160% mtDNA copy number. He was normal until 11 years of age when he developed mild tremor and ataxia. At 13 years of age, he reported occasional migraine-like headaches and was found to have mild ataxia and myoclonus. generalized seizures. mild leftsided hemiparesis, external ophthalmoplegia, and peripheral neuropathy.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	childhood
Age of Onset: 11, Age of Patient: 24, Age of Death: n/a

Reference:	Sarzi et al, 2007; [PubMed] 53
Description:	Feeding difficulties 2 days after birth and trunk hypotonia, dysmorphy, hypotonia, coloboma, heart failure at 2 months, liver insufficiency at 4 months. Liver and muscle mtDNA depletion.
Mutations:	A467T, K561M, W748S
Age group:	infantile
Age of Onset: 0.001, Age of Patient: n/a, Age of Death: 0.5

Reference:	Schulte et al, 2009; [PubMed] 54
Description:	Dysarthria, sensory neuropathy, PEO, minor cognitive dysfunction, depression.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 34, Age of Patient: n/a, Age of Death: n/a

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Reference:	Stewart et al, 2009; [PubMed] 55
Description:	PEO, ataxia, seizures, ptosis, bilateral deafness, myopathy, dysarthria, peripheral neuropathy, multiple mtDNA deletions. 5% COX deficient fibers, 2% RRF.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 39, Age of Patient: n/a, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 56
Description:	Autistic features, headaches/migraines, ataxia, seizures, intractable seizure, optic atrophy, abnormal MRI, dystonia, posterior stroke, abnormal EEG. 101% mtDNA copy number in blood.
Mutations:	A467T, W748S
Age group:	juvenile
Age of Onset: n/a, Age of Patient: 18, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 57
Description:	Hearing loss, Ataxia Neuropathy Spectrum, Seizures, dementia, developmental delay
Mutations:	A467T, Q497H, W748S
SNPs:	E1143G
Age group:	juvenile
Age of Onset: 17, Age of Patient: n/a, Age of Death: n/a

Reference:	Hansen et al, 2012; [PubMed] 58
Description:	gait instability, manual coordination disorder, speech disturbance and secondary generalized motor seizures, tension-type headaches, complete external ophthalmoplegia, cerebellar dysarthria and ataxia, sensory ataxia in Romberg-testing, areflexia of the lower extremities, mild cognitive dysfunction, epileptic seizures, generalised cortical atrophy, sensory axonal neuropathy, dysarthria
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 23, Age of Patient: 48, Age of Death: n/a

Reference:	Kinghorn et al, 2012; [PubMed] 59
Description:	Ataxia, dysarthria, suffered two generalized seizures, and developed severe progressive cognitive decline and psychiatric manifestations including visual and auditory hallucinations, bilateral external ophthalmoplegia, bilateral ptosis, and reduced visual acuities, bilateral sensorineural hearing loss, proximal muscle weakness in all four limbs and was areflexic, severe sensory neuropathy and myopathy,
Mutations:	A467T, W748S
Age group:	juvenile
Age of Onset: n/a, Age of Patient: 18, Age of Death: 65

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Reference:	Kinghorn et al, 2012; [PubMed] 60
Description:	Diplopia, partial ophthalmoparesis in all directions of gaze and dysarthria, sensory neuropathy, COX-deficient fibers, multiple mtDNA deletions,
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: n/a, Age of Patient: 50, Age of Death: n/a

Reference:	Pelayo-Negro et al, 2012; [PubMed] 61
Description:	ataxia, sensory neuropathy, dysarthria, and external ophthalmoparesis
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 30, Age of Patient: 50, Age of Death: n/a

Reference:	Lax et al, 2012a; [PubMed] 62
Description:	CPEO, Ptosis, Peripheral neuropathy, COX-deficient fibers, presence of mitochondrial dna deletions in muscle, ataxia, Severe sensory, moderate motor axonal neuronopathy, Distal neurogenic, proximal myopathy
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 41, Age of Patient: 48, Age of Death: n/a

Reference:	Lax et al, 2012a; [PubMed] 63
Description:	CPEO, Ptosis, Peripheral neuropathy, COX-deficient fibers, ragged red fibers, presence of mitochondrial dna deletions in muscle, Severe sensory and moderate motor neuronopathy, Distal neurogenic change, proximal myopathy
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 34, Age of Patient: 47, Age of Death: n/a

Reference:	Lax et al, 2012a; [PubMed] 64
Description:	Peripheral neuropathy, ataxia, epilepsy, COX-deficient fibers, presence of mitochondrial dna deletions in muscle, Moderate sensory neuronopathy
Mutations:	A467T, W748S
Age group:	juvenile
Age of Onset: 16, Age of Patient: 18, Age of Death: n/a

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Reference:	Lax et al, 2012a; [PubMed] 65
Description:	Peripheral neuropathy, ataxia, epilepsy, presence of mitochondrial dna deletions in muscle,
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 20, Age of Patient: 24, Age of Death: n/a

Reference:	Tzoulis et al, 2006; [PubMed] 66
Description:	Presented with epilepsy and headaches, ataxia, status epilepticus, nystagmus, myoclonus, neuropathy. Sodium valproate treatment 6 weeks prior to death. Liver dysfunction, cause of death status epilepticus and liver failure. Hepatic histology showed acute liver necrosis.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	juvenile
Age of Onset: 19, Age of Patient: n/a, Age of Death: 19

Reference:	Tzoulis et al, 2006; [PubMed] 67
Description:	Presented with epilepsy and headaches, ataxia, epilepsy, status epilepticus, myoclonus, neuropathy. Sodium valproate treatment 7 weeks prior to death. Liver dysfunction and rising liver enzymes and bilirubin terminally, cause of death status epilepticus. Hepatic histology showed centrolobular degeneration.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	juvenile
Age of Onset: 14, Age of Patient: n/a, Age of Death: 23

Reference:	Tzoulis et al, 2006; [PubMed] 68
Description:	Presented with epilepsy, ataxia, status epilepticus, headaches, myoclonus, neuropathy. Sodium valproate treatment for 8 months. Stopped just prior to death. Liver dysfunction, cause of death liver failure. Hepatic histology showed acute liver necrosis.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	childhood
Age of Onset: 10, Age of Patient: n/a, Age of Death: 10

Reference:	Tzoulis et al, 2006; [PubMed] 69
Description:	Presented with epilepsy, headaches, epilepsy, status epilepticus, headaches, nystagmus, and neuropathy. Sodium valproate treatment for 2 months then stopped 2 months prior to death. Liver dysfunction, liver transplant 1 month prior to death, cause of death liver failure. Hepatic histology showed acute liver necrosis.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	adult
Age of Onset: 20, Age of Patient: n/a, Age of Death: 20

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Reference:	Tzoulis et al, 2006; [PubMed] 70
Description:	Presented with epilepsy, status epilepticus, headaches, nystagmus, myoclonus, neuropathy. Sodium valproate treatment 7 weeks prior to death. Liver dysfunction and rising liver enzymes and bilirubin terminally, cause of death status epilepticus. Hepatic histology showed centrolobular degeneration.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	juvenile
Age of Onset: 15, Age of Patient: n/a, Age of Death: 21

Reference:	Tzoulis et al, 2006; [PubMed] 71
Description:	Presented with progressive gait unsteadiness, ataxia, headaches, myoclonus, neuropathy, PEO, ptosis onset at age 44
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	adult
Age of Onset: 36, Age of Patient: 50, Age of Death: n/a

Reference:	Tzoulis et al, 2006; [PubMed] 72
Description:	Presented with progressive gait unsteadiness, ataxia, headaches, neuropathy, PEO ptosis onset age 25
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	adult
Age of Onset: 24, Age of Patient: 43, Age of Death: n/a

Reference:	Paus et al, 2008; [PubMed] 73
Description:	Presented with PEO, mild bilateral ptosis, dysarthria, ataxia, and neuropathy
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	adult
Age of Onset: 36, Age of Patient: 37, Age of Death: n/a

Reference:	Paus et al, 2008; [PubMed] 74
Description:	episodic headache, cognitive decline, and seizures, repeatedly resulting in generalized status epilepticus, ataxia, sensorimotor peripheral neuropathy, dysarthria, PEO with diplopia, mild bilateral ptosis, epilepsy, cognitive impairment, myoclonus,
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 28, Age of Patient: 39, Age of Death: n/a

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Reference:	Rouzier et al, 2013; [PubMed] 75
Description:	R-EPC (refractory epilepsia partialis continua), axonal neuropathy, cerebellar ataxia, hyperintensity of rolandic, occipital and cerebellar cortex and dentate nucleus.
Mutations:	A467T, W748S
Age group:	juvenile
Age of Onset: 17, Age of Patient: n/a, Age of Death: n/a

Reference:	Posada et al, 2010; [PubMed] 76
Description:	Ataxic sensory neuropathy, dysarthria, progressive ophthalmoplegia, paresthesia of lower extremities, unsteady gait, slurred speech, absent deep tendon reflexes, vibrations, ataxic gait and positive Romberg sign. Multiple mtDNA deletions, a marked decrease in mtDNA copy number.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	adult
Age of Onset: 37, Age of Patient: 47, Age of Death: n/a

Reference:	Roshal et al, 2011; [PubMed] 77
Description:	Focal parieto-occipital lobe seizures, migraine headaches, cerebellar ataxia, sensory–motor axonal neuropathy, and impairment of visual perception and cognitive function.
Mutations:	A467T, W748S
Age group:	juvenile
Age of Onset: 15, Age of Patient: 16, Age of Death: n/a

Reference:	Tuladhar et al, 2013; [PubMed] 78
Description:	abnormal gait, ataxia, PEO, and jerky torticollis, mild cerebellar atrophy, sensory neuronopathy.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 43, Age of Patient: 45, Age of Death: n/a

Reference:	Tzoulis et al, 2013; [PubMed] 79
Description:	Ataxia, peripheral neuropathy, progressive external ophthalmoplegia (PEO).
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 24, Age of Patient: 50, Age of Death: n/a

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Reference:	Tzoulis et al, 2013; [PubMed] 80
Description:	Ataxia, peripheral neuropathy, progressive external ophthalmoplegia (PEO).
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 36, Age of Patient: 58, Age of Death: n/a

Reference:	Hanisch et al, 2014; [PubMed] 81
Description:	Ataxia, ptosis, mild cognitive impairment, sensory neuropathy, motor neuropathy, axonal neuropathy, demyelinating neuropathy.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 41, Age of Patient: 45, Age of Death: n/a

Reference:	Hanisch et al, 2014; [PubMed] 82
Description:	Ataxia, ptosis, pareses, diabetes, sensory neuropathy, motor neuropathy, axonal neuropathy, demyelinating neuropathy.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 49, Age of Patient: 56, Age of Death: n/a

Reference:	Lax et al, 2012b; [PubMed] 83
Description:	Ataxia, Epilepsy, Dementia, Encephalopathy, Myoclonus, Fatigue, Depression, Dysarthria, Cardiac failure, cardiomyopathy, Diabetes, arPEO, Ischemic heart disease.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 20, Age of Patient: 24, Age of Death: n/a

Reference:	Sitarz et al, 2014; [PubMed] 84
Description:	Ataxia, neuropathy, PEO, MIRAS.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: n/a, Age of Patient: 39, Age of Death: n/a

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Reference:	Tzoulis et al, 2014; [PubMed] 85
Description:	Epilepsy, stroke-like episode, Ataxia, Neuropathy.
Mutations:	A467T, W748S
Age group:	juvenile
Age of Onset: 13, Age of Patient: n/a, Age of Death: 21

Reference:	Tzoulis et al, 2014; [PubMed] 86
Description:	Epilepsy, stroke-like episode, Ataxia, Neuropathy.
Mutations:	A467T, W748S
Age group:	juvenile
Age of Onset: 14, Age of Patient: n/a, Age of Death: 23

Reference:	Van Goethem et al, 2004; [PubMed] 87
Description:	minor tremor of the hands from age 12 years. In his late 20s, he experienced tingling in both hands, followed by tingling in the legs. In the early fourth decade, he became unsteady at walking, especially in the dark. From his early 40s, his speech became slurred (dysarthria). On examination at age 52 years, he had an ataxic gait, and Romberg test was positive. There was dysarthria and bilateral ophthalmoparesis. generalized areflexia.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	childhood
Age of Onset: 12, Age of Patient: 52, Age of Death: n/a

Reference:	Janssen et al, 2016; [PubMed] 88
Description:	Migraine, ataxia, polyneuropathy. focal seizures with visual symptoms and motor signs, and secondary generalized tonic-clonic seizure. Clinical neurological examination revealed an ataxic gait and areflexia with sensory loss. Convulsive status epilepticus. Cerebral MRI revealed a left occipital and left thalamic lesion.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	juvenile
Age of Onset: 17, Age of Patient: 20, Age of Death: 23

Reference:	Janssen et al, 2016; [PubMed] 89
Description:	Presented with status epilepticus, occipital lobe seizures. Further neurologic examination showed ataxic gait and appendicular ataxia. chronic sensory axonal polyneuropathy. Cognitive decline. At follow-up consultation 6 months after the initial presentation, she had not experienced any more seizures.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	juvenile
Age of Onset: 18, Age of Patient: 18.7, Age of Death: n/a

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Reference:	Janssen et al, 2016; [PubMed] 90
Description:	She had occipital lobe and secondarily generalized seizures. In addition, she had PEO, truncal and appendicular ataxia and peripheral neuropathy with diminished vibration sense and areflexia. She reported sporadic occurrence of seizures with a frequency of once in every few months.
Mutations:	A467T, W748S
Age group:	adult
Age of Onset: 21, Age of Patient: 47, Age of Death: n/a

Reference:	Ashley et al, 2008; [PubMed] 91
Description:	Hepatopathy, Epilepsy, Hepatopathy,
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 1.5, Age of Patient: n/a, Age of Death: n/a

Reference:	de Vries et al, 2007; [PubMed] 92
Description:	Onset at 6 months with FTT, dementia, hypotonia, seizures, hepatopathy, aplasia cutis, delayed myelinisation. Death at 15 months.
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.5, Age of Patient: n/a, Age of Death: 1.3

Reference:	Ferrari et al, 2005; [PubMed] 93
Description:	He developed normally in the first 6 months. Refusal of food and failure to thrive were noted from the 7th month of life. At 1 year of age, increased transaminase levels in the blood were accompanied by liver enlargement and hyperecogenicity. Motor development was delayed. hypoglycaemic episodes and lactic acidosis. A liver biopsy at the age of 16 months revealed steatosis and fibrosis. At 20 months of age, he had numerous episodes of status epilepticus and epilepsia partialis continua. The patient died at 2.5 years of age during an episode of status epilepticus. Alpers’ syndrome.
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.5, Age of Patient: n/a, Age of Death: 2.5

Reference:	Kollberg et al, 2006; [PubMed] 94
Description:	Ragged Red Fibers, COX-Deficient Fibers. The boy had feeding difficulties with failure to thrive since 3 months of age. Delayed motor development. general muscle weakness and ataxia. compromised liver function.
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.33, Age of Patient: n/a, Age of Death: 1.33

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Reference:	Stewart et al, 2009; [PubMed] 95
Description:	Alpers, Epilepsy, developmental delay, COX deficient fibres.
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: n/a

Reference:	Stewart et al, 2009; [PubMed] 96
Description:	Alpers, seizures, developmental delay, liver failure, hypotonia, impaired vision, renal stones, mtDNA depletion in muscle. 5% COX deficient fibers.
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.7, Age of Patient: n/a, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 97
Description:	Developmental delay, dementia, seizures, Alpers
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 98
Description:	Developmental delay, dementia, seizures, Alpers, Ataxia
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 99
Description:	Developmental delay, dementia, seizures, Alpers, Lactic acidosis, Cortical athrophy, hypoglycemia
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 1.5, Age of Patient: n/a, Age of Death: n/a

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Reference:	Wong et al, 2008; [PubMed] 100
Description:	Developmental delay, dementia, seizures, Alpers, Lactic acidosis, Stroke
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 101
Description:	Developmental delay, dementia, seizures, Alpers, Stroke, ataxia, exercise intolerance
Mutations:	A467T, G848S
Age group:	childhood
Age of Onset: 9, Age of Patient: n/a, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 102
Description:	Developmental delay, dementia, seizures, Alpers, hypotonia, failure to thrive
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.8, Age of Patient: n/a, Age of Death: n/a

Reference:	Nguyen et al, 2005; [PubMed] 103
Description:	Refractory seizures, psychomotor regression, liver disease, Transient hypoglycemia, Transient lactic academia, Elevated CSF protein, presented with epilepsia partialis continua,
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.9, Age of Patient: n/a, Age of Death: 1.8

Reference:	Nguyen et al, 2005; [PubMed] 104
Description:	Refractory seizures, psychomotor regression, liver disease, presented with liver failure
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: 1.3

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Reference:	Saneto et al, 2010; [PubMed] 105
Description:	Cyclic vomiting, episodic hypoglycemia then seizure onset at 6 years, generalized seizures, GI dysmotility, eyelid ptosis,ophthalmoplegia, sensorineural hearning loss, absent smooth pursuit eye movements
Mutations:	A467T, G848S
Age group:	childhood
Age of Onset: 6, Age of Patient: 11, Age of Death: n/a

Reference:	Hunter et al, 2011; [PubMed] 106
Description:	Myoclonic Seizures, Epilepsia partialis continua, Developmental Delay or Regression, ataxia, Abnormal Liver Enzymes, Serum Lactate, liver mtDNA depletion, Alpers
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.5, Age of Patient: n/a, Age of Death: 3.33

Reference:	Hunter et al, 2011; [PubMed] 107
Description:	Myoclonic Seizures, Generalized tonic-clonic seizures, Focal motor seizures, Developmental Delay or Regression, hypotonia, tremor, Abnormal Liver Enzymes, Serum Lactate, liver mtDNA depletion, death by liver failure, Alpers
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.83, Age of Patient: n/a, Age of Death: 0.92

Reference:	McCoy et al, 2011; [PubMed] 108
Description:	focal seizures, elevated liver transaminases, Elevated CSF protein, patient died several weeks later
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.8, Age of Patient: n/a, Age of Death: 1

Reference:	Scalais et al, 2012; [PubMed] 109
Description:	presented with hypoglycemia, lactic acidosis, moderate ketosis and liver dysfunction, generalized hypotonia, progressive jaundice and abdominal distension with ascites, status epilepticus with generalized tonico-clonic seizures. She had an intermittent tremor, moderate truncal ataxia with a wide-based gait, myoclonic seizures, epilepsia partialis continua,
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.29, Age of Patient: n/a, Age of Death: 5

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Reference:	de Vries et al, 2008; [PubMed] 110
Description:	Delayed motor and mental development, From the age of 3 years his psychomotor development declined and epilepsy, visual impairment and sensorineuronal deafness, epilepsia partialis continua. Bilateral ptosis, generalized hypotonia, ataxia, absent reflexes and hyperlaxity by age 5.
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 3, Age of Patient: 5, Age of Death: n/a

Reference:	Hasselmann et al, 2010; [PubMed] 111
Description:	Alpers, status epilepticus and somnolence, ataxia with dysmetria and muscular hypotonia. Healthy unrelated parents. Laboratory investigations revealed myoclonic epilepsy with ragged red fibers,
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 2.2, Age of Patient: 3.5, Age of Death: 5.5

Reference:	Tzoulis et al, 2013; [PubMed] 112
Description:	Epilepsy, stroke-like episodes.
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.6, Age of Patient: n/a, Age of Death: 0.6

Reference:	Roels et al, 2009; [PubMed] 113
Description:	mtDNA depletion. severe hypoglycemia, liver biopsy shows micronodular cirrhosis. At 3 y 9 m, status epilepticus develops which occurs again at 4 y and is difficult to control. myoclonia. She dies from bronchopulmonary infection when 5 y old. COX negative fibers.
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.25, Age of Patient: 4, Age of Death: 5

Reference:	Tzoulis et al, 2014; [PubMed] 114
Description:	Epilepsy, stroke-like episode.
Mutations:	A467T, G848S
Age group:	infantile
Age of Onset: 0.6, Age of Patient: n/a, Age of Death: 0.6

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Reference:	Ashley et al, 2008; [PubMed] 115
Description:	Epilepsy, hepatopathy, movement disorder (present but not prominent)
Mutations:	A467T
SNPs:	PNF
Age group:	infantile
Age of Onset: 0.33, Age of Patient: n/a, Age of Death: n/a

Reference:	Ashley et al, 2008; [PubMed] 116
Description:	Epilepsy, hepatopathy, movement disorder (present but not prominent)
Mutations:	A467T
SNPs:	PNF
Age group:	infantile
Age of Onset: 0.58, Age of Patient: n/a, Age of Death: n/a

Reference:	Ashley et al, 2008; [PubMed] 117
Description:	mtDNA depletion (30% in muscle), epilepsy, hepatopathy, movement disorder
Mutations:	A467T, PNF
Age group:	infantile
Age of Onset: 1.5, Age of Patient: n/a, Age of Death: n/a

Reference:	Sarzi et al, 2007; [PubMed] 118
Description:	Myoclonus epilepsy, Epilepsy, Alpers syndrome, steatosis, death at 3 years
Mutations:	A467T
SNPs:	PNF
Age group:	childhood
Age of Onset: 3, Age of Patient: n/a, Age of Death: 3

Reference:	Sarzi et al, 2007; [PubMed] 119
Description:	Seizures, Alpers syndrome, Jaundice at 9 months and liver enlargement.
Mutations:	A467T
SNPs:	PNF
Age group:	infantile
Age of Onset: 0.66, Age of Patient: n/a, Age of Death: n/a

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Reference:	Wong et al, 2008; [PubMed] 120
Description:	Alpers, stroke, hypotonia, Dementia, developmental delay, seizures.
Mutations:	A467T
SNPs:	PNF
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 121
Description:	Developmental delay, dementia, seizures, Alpers
Mutations:	A467T
SNPs:	PNF
Age group:	childhood
Age of Onset: 4, Age of Patient: n/a, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 122
Description:	Developmental delay, dementia, seizures, Alpers, Family history of acute liver failure
Mutations:	A467T
SNPs:	PNF
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 123
Description:	Developmental delay, dementia, seizures, Alpers, Ptosis, ataxia, visual hallucinations
Mutations:	A467T
SNPs:	PNF
Age group:	childhood
Age of Onset: 3, Age of Patient: n/a, Age of Death: n/a

Reference:	Nguyen et al, 2005; [PubMed] 124
Description:	Refractory seizures, psychomotor regression, liver disease, presenting symptom was status epilepticus, Transient hypoglycemia, Transient lactic academia, hypercoagulable state
Mutations:	A467T
SNPs:	PNF
Age group:	infantile
Age of Onset: 0.8, Age of Patient: n/a, Age of Death: 1

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Reference:	Lutz et al, 2009; [PubMed] 125
Description:	speech and motor delay at 1.5 yr, seizure that included eye deviation, jaw clenching, and hypotonia of the trunk and extremities. He experienced repetitive generalized tonic-clonic seizures that evolved into refractory status epilepticus, severe encephalopathy characterized by choreo-athetoid movements, corticovisual impairment, diffuse hypotonia, and severe swallowing dysfunction, elevated plasma lactate, CSF lactate and protein were both elevated, Liver transaminases remained mildly elevated. dysphagia.
Mutations:	A467T
SNPs:	PNF
Age group:	infantile
Age of Onset: 1.5, Age of Patient: n/a, Age of Death: n/a

Reference:	Mousson de Camaret et al, 2011 [PubMed] 126
Description:	Alpers. At 1 year of age, she presented a rightsided clonic status epilepticus resistant to multiple antiepileptic drugs. Carbamazepine worsened myoclonic jerks. A ketogenic diet was well tolerated but was ineffective. At 12 months, dramatic psychomotor regression was observed with poor interaction, major global hypotonia and no eye contact due to cortical blindness. epilepsia partialis continua reinforced by recurrent episodes of tonic clonic seizures. At 16 months of age, liver enlargement was noticed associated with mild cytolysis. The patient died at 27 months of age of respiratory failure.
Mutations:	A467T
SNPs:	PNF
Age group:	infantile
Age of Onset: 0.5, Age of Patient: n/a, Age of Death: 2.25

Reference:	Naviaux and Nguyen, 2004; [PubMed] 127
Description:	At 11 months, she developed otitis media and shortly thereafter she was admitted to the intensive care unit and intubated and treated for 2 days for apnea associated with an episode of absence status epilepticus. Brain computed tomography at that time was normal. Her gait was ataxic after recovery, and she had bouts of epilepsia partialis continua, initially involving the left hand. At 16 months, she suffered another episode of status epilepticus requiring intubation for airway protection and ventilatory support. Head control was lost permanently after this episode. she was found to have cortical blindness, and brain magnetic resonance imaging showed marked cerebral atrophy without focal abnormalities. A liver biopsy showed chronic and acute liver disease with micronodular cirrhosis, hepatocyte dropout, microvesicular fat, and bile ductular proliferation. The diagnosis of Alpers’ syndrome was made at that time. refractory partial seizures, scoliosis, quadriparesis, tracheomalacia, and osteoporosis and was aphasic.
Mutations:	A467T, PNF, PNF
Age group:	infantile
Age of Onset: 0.9, Age of Patient: n/a, Age of Death: 10

Reference:	Naviaux and Nguyen, 2004; [PubMed] 128
Description:	He had been well and developmentally normal until 15 months when he suffered 3 days of a diarrheal illness and required admission for new ataxia and encephalopathy. On the day of admission, he developed status epilepticus and was intubated for 3 weeks for aspiration pneumonia. He developed progressive hepatic failure and cortical blindness. He remained in a vegetative state until he died. Autopsy showed massive cerebellar and cerebral atrophy.
Mutations:	A467T, PNF, PNF
Age group:	infantile
Age of Onset: 1.25, Age of Patient: n/a, Age of Death: 1.3

Reference:	Naviaux and Nguyen, 2004; [PubMed] 129
Description:	His speech and motor development were normal until 19 months of age when he developed an episode of encephalopathy, ataxia, and hypertonia associated with an acute febrile illness. At 30 months, he developed a refractory focal myoclonic seizure disorder. His terminal admission was associated with a documented Rotavirus infection. At this time, he was noted to have cortical blindness, epilepsia partialis continua, and acute liver failure (hepatic failure). lactic acidemia. He was well until 19 months of age, when he experienced an acute febrile illness with anorexia, vomiting, and diarrhea. This was complicated by acute truncal ataxia, lethargy, and hypertonicity.
Mutations:	A467T, PNF, PNF
Age group:	infantile
Age of Onset: 1.58, Age of Patient: n/a, Age of Death: 3.5

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Reference:	Martikainen et al, 2016; [PubMed] 130
Description:	Parkinsons, PEO, short-term memory problems, general cerebral and cerebellar atrophy.
Mutations:	A467T
SNPs:	PNF
Age group:	adult
Age of Onset: 50, Age of Patient: 81, Age of Death: n/a

Reference:	Flemming, et al 2002; [PubMed] 131
Description:	mental and motor developmental delay. At the age of 7 years, strabismus convergens\\ occurred. headache and nausea and\\ then presented with a generalized tonic-clonic seizure. myoclonia, focal motor seizures evolved into epilepsia partialis continua. Alpers. During the first 4 months of his illness, the boy became blind and incontinent and lost his ability to walk freely. During the\\ ensuing years, a further slight loss of mental and motor capabilities and several episodes of status epilepticus occurred.
Mutations:	A467T
SNPs:	PNF
Age group:	childhood
Age of Onset: 4, Age of Patient: 11, Age of Death: n/a

Reference:	Ashley et al, 2008; [PubMed] 132
Description:	Hepatopathy
Mutations:	A467T, T914P
Age group:	juvenile
Age of Onset: 15, Age of Patient: n/a, Age of Death: n/a

Reference:	Ashley et al, 2008; [PubMed] 133
Description:	reported as Alpers, onset at 7 months, presenting encephalopathy with epilepsy, hepatopathy, and movement disorder (ataxia). 39% mtDNA copy number in muscle.
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: 0.58, Age of Patient: n/a, Age of Death: n/a

Reference:	Blok et al, 2009; [PubMed] 134
Description:	Epilepsy, myoclonus, and developmental delay.
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: n/a, Age of Patient: 1, Age of Death: n/a

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Reference:	Horvath et al, 2006; [PubMed] 135
Description:	Onset at 1.5 years with encephalopathy and hepatopathy and cortical blindness. Diagnosed as Alpers.
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: 1.5, Age of Patient: 2, Age of Death: n/a

Reference:	Horvath et al, 2006; [PubMed] 136
Description:	Onset at 4 years with encephalopathy, myoclonus, and SLE.
Mutations:	A467T, T914P
Age group:	childhood
Age of Onset: 4, Age of Patient: 8, Age of Death: n/a

Reference:	Taanman et al, 2009; [PubMed] 137
Description:	Onset at 9 months with alpers, death at 12 months. 8% mtDNA copy number in liver, 8% mtDNA copy number in muscle.
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: 0.8, Age of Patient: n/a, Age of Death: 1

Reference:	Tang et al, 2011; [PubMed] 138
Description:	Developmental delay, headaches/migraines, seizures, hemiparesis, intractable seizure, high CSF lactate, high CSF protein, hearing loss, abnormal EEG, increased signal basal ganglia, abnormal MRI. 88% mtDNA copy number in blood.
Mutations:	A467T, T914P
Age group:	childhood
Age of Onset: n/a, Age of Patient: 5, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 139
Description:	Developmental delay, hypotonia, dementia/encephalopathy, seizures, intractable seizure, lactic acidosis, high CSF lactate, abnormal MRI, no liver problem at 3.5 years. 24% mtDNA copy number in blood.
Mutations:	A467T, T914P
Age group:	childhood
Age of Onset: n/a, Age of Patient: 3, Age of Death: n/a

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Reference:	Tang et al, 2011; [PubMed] 140
Description:	Developmental delay, hypotonia, seizures, myoclonic seizures, hemiparesis, intractable seizure, elevated transaminases, FTT, lactic acidosis, high CSF lactate, elevated pyruvate, high CSF protein, dementia/encephalopathy. 112% mtDNA copy number in muscle, 63% mtDNA copy number in blood.
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: n/a, Age of Patient: 0.9, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 141
Description:	Developmental delay, seizures, myoclonic seizures, intractable seizure, respiratory deficiency/failure, abnormal EEG, abnormal MRI. 60% mtDNA copy number in blood.
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: n/a, Age of Patient: 0.8, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 142
Description:	Seizures, hepatic failure, duplicated cyst of ileum, FTT, diarrhea. 13% mtDNA copy number in liver.
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: n/a, Age of Patient: 4, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 143
Description:	Developmental delay, dementia, seizures, Alpers
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 144
Description:	Onset 2 years with dementia, seizures, and liver failure. Alpers
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: n/a

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Reference:	Nguyen et al, 2006; [PubMed] 145
Description:	Alpers
Mutations:	A467T, T914P
Age group:	unknown
Age of Onset: n/a, Age of Patient: n/a, Age of Death: n/a

Reference:	Dhamija et al, 2011; [PubMed] 146
Description:	myoclonic status epilepticus, myoclonic seizures at 8 months, developmental regression, febrile upper respiratory tract infection, nearly continuous myoclonic jerks, normocephalic, nondysmorphic, diffuse hypotonia, died secondary to complications of hepatic failure.
Mutations:	A467T, T914P
Age group:	infantile
Age of Onset: 0.8, Age of Patient: n/a, Age of Death: 1

Reference:	Baruffini et al, 2011; [PubMed] 147
Description:	Alpers
Mutations:	A467T, G303R
Age group:	infantile
Age of Onset: n/a, Age of Patient: n/a, Age of Death: 0.42

Reference:	Baruffini et al, 2011; [PubMed] 148
Description:	Alpers
Mutations:	A467T, G303R
Age group:	infantile
Age of Onset: n/a, Age of Patient: n/a, Age of Death: 0.92

Reference:	Tzoulis et al, 2010; [PubMed] 149
Description:	Encephalopathy with epilepsy, and liver disease.
Mutations:	A467T, G303R
Age group:	infantile
Age of Onset: 0.9, Age of Patient: n/a, Age of Death: 1.1

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Reference:	Tzoulis et al, 2010; [PubMed] 150
Description:	Encephalopathy with epilepsy, and liver disease.
Mutations:	A467T, G303R
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: 1.4

Reference:	Tzoulis et al, 2010; [PubMed] 151
Description:	Encephalopathy with epilepsy, ataxia.
Mutations:	A467T, G303R
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: 8

Reference:	Sofou et al, 2012; [PubMed] 152
Description:	Psychomotor deterioration, hypotonia, spasticity, Stroke-like episodes, Refractory seizures, Epilepsia Partialis Continua, Status Epilepticus, Myoclonus, severe hepatic dysfunction,
Mutations:	A467T, G303R
Age group:	infantile
Age of Onset: 0.916, Age of Patient: n/a, Age of Death: n/a

Reference:	Tzoulis et al, 2014; [PubMed] 153
Description:	Epilepsy, stroke-like episode, Ataxia.
Mutations:	A467T, G303R
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: 8

Reference:	Tzoulis et al, 2014; [PubMed] 154
Description:	Epilepsy, stroke-like episode.
Mutations:	A467T, G303R
Age group:	infantile
Age of Onset: 0.9, Age of Patient: n/a, Age of Death: 1.1

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Reference:	Ashley et al, 2008; [PubMed] 155
Description:	reported as Alpers, onset at 2 years, presenting encephalopathy with epilepsy, hepatopathy. 22% mtDNA copy number in muscle.
Mutations:	A467T, R852C
SNPs:	G11D
Age group:	infantile
Age of Onset: 2.25, Age of Patient: n/a, Age of Death: n/a

Reference:	Stewart et al, 2009; [PubMed] 156
Description:	Alpers, seizures, abnormal liver function, mild lactic acidosis, normal histology of COX fibers.
Mutations:	A467T, R852C
SNPs:	G11D
Age group:	infantile
Age of Onset: 1.25, Age of Patient: n/a, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 157
Description:	Seizures, myoclonic seizures, intractable seizures, hepatic failure, elevated transaminases, Apnes/Hypoventilation, respiratory deficiency/failure, lactic acidosis, organic aciduria/tiglyglycine, low plasma carnitine, abnormal EEG. 108% mtDNA copy number in blood.
Mutations:	A467T, R852C
SNPs:	G11D
Age group:	infantile
Age of Onset: n/a, Age of Patient: 0.8, Age of Death: n/a

Reference:	Nguyen et al, 2006; [PubMed] 158
Description:	Alpers
Mutations:	A467T, R852C
Age group:	unknown
Age of Onset: n/a, Age of Patient: n/a, Age of Death: n/a

Reference:	Hunter et al, 2011; [PubMed] 159
Description:	Myoclonic Seizures, visual disturbance, motor paresis, Focal motor seizures, Epilepsia partialis continua, Developmental Delay or Regression, ataxia, Serum Lactate, liver mtDNA depletion, Alpers
Mutations:	A467T, R852C
Age group:	infantile
Age of Onset: 1.33, Age of Patient: n/a, Age of Death: 5.08

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Reference:	McCoy et al, 2011; [PubMed] 160
Description:	clonic seizures of the right arm and leg, Coma persisted and was accompanied by hypoglycaemia, tachycardia and oliguria, CSF proteinwas elevated, cortical blindness, anarthria and profound hypotonia, Liver dysfunction, prolonged focal seizures, acute encephalopathy,
Mutations:	A467T, R852C
Age group:	infantile
Age of Onset: 1.75, Age of Patient: n/a, Age of Death: 3.5

Reference:	Luoma et al, 2005; [PubMed] 161
Description:	This 50-year-old woman developed progressive blepharoptosis slowly at the age of 40. She underwent blepharoplasty at the age of 47. Her neurological examination at the age of 50 was normal. Late onset ptosis
Mutations:	A467T
Age group:	adult
Age of Onset: 40, Age of Patient: 50, Age of Death: n/a

Reference:	Luoma et al, 2005; [PubMed] 162
Description:	This 64-year-old woman, the mother of the index patient, developed slowly progressive blepharoptosis at the age of 45. She underwent blepharoplasty at the age of 58. In the neurological examination at the age of 63, she had ptosis, but no other neurological deficits. Late onset ptosis.
Mutations:	A467T
Age group:	adult
Age of Onset: 45, Age of Patient: 64, Age of Death: n/a

Reference:	Luoma et al, 2005; [PubMed] 163
Description:	This 66-year-old woman developed progressive blepharoptosis slowly at the age of 50. She underwent blepharoplasty at the age of 62, and in the same year, she suffered a transitory ischemic attack. At the age of 66, no clinical findings except ptosis were detectable. Late onset ptosis.
Mutations:	A467T
Age group:	adult
Age of Onset: 50, Age of Patient: 66, Age of Death: n/a

Reference:	Luoma et al, 2005; [PubMed] 164
Description:	probable mild blepharoptosis, early onset ptosis
Mutations:	A467T
Age group:	adult
Age of Onset: n/a, Age of Patient: 23, Age of Death: n/a

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Reference:	Galassi et al, 2008; [PubMed] 165
Description:	at age 24 developed PEO and weakness of neck and proximal limb muscles. presence of multiple mtDNA deleted species, unsteady, broad-based gait. At age 32 she had complete PEO, bradykinesia, cogwheel rigidity, slurred speech, dysphagia, dysmetria, positive Romberg sign, reduced arm swing, and intermittent bilateral postural-action tremor. axonal sensorimotor neuropathy, severe depression, insomnia, and nocturnal panic attacks Has also mutation ANT1 gene (V289M)
Mutations:	A467T
Age group:	adult
Age of Onset: 24, Age of Patient: 42, Age of Death: n/a

Reference:	Rouzier et al, 2013; [PubMed] 166
Description:	LS-like, sensorimotor neuropathy. At 56 years old, patient 13 developed a motor neuron disease with severe tetraparesis, dysphonia and respiratory insufficiency leading to death a few years later. Muscular biopsy was strongly evocative of mitochondrial disease with a generalized RC deficiency, multiple mtDNA deletions and decreased mtDNA copy number in the muscle (39%).
Mutations:	A467T
Age group:	adult
Age of Onset: 56, Age of Patient: 56, Age of Death: 60

Reference:	Van Goethem et al, 2003a; [PubMed] 167
Description:	myopathy, PEO, dysarthria.
Mutations:	A467T, L304R
Age group:	juvenile
Age of Onset: 16, Age of Patient: n/a, Age of Death: 37

Reference:	Van Goethem et al, 2003a; [PubMed] 168
Description:	sensory ataxic neuropathy, PEO, dysarthria.
Mutations:	A467T, L304R
Age group:	adult
Age of Onset: 25, Age of Patient: n/a, Age of Death: n/a

Reference:	Van Goethem et al, 2001; [PubMed] 169
Description:	ocular symptoms, psychiatric symptoms, ptosis, opthalmoplegia, muscle weakness, distal sensory neuropathy, areflexia, pes cavus.
Mutations:	A467T, L304R
Age group:	adult
Age of Onset: 25, Age of Patient: 38, Age of Death: n/a

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Reference:	Van Goethem et al, 2001; [PubMed] 170
Description:	ocular symptoms, ptosis, opthalmoplegia, dysphagia, muscle weakness, areflexia, retinopathy.
Mutations:	A467T, L304R
Age group:	adult
Age of Onset: 24, Age of Patient: 34, Age of Death: n/a

Reference:	Van Goethem et al, 2001; [PubMed] 171
Description:	psychiatric symptoms, ptosis, opthalmoplegia, dysphonia, dysphagia, muscle weakness, loss of weight, areflexia.
Mutations:	A467T, L304R
Age group:	juvenile
Age of Onset: 16, Age of Patient: 28, Age of Death: n/a

Reference:	Ashley et al, 2008; [PubMed] 172
Description:	Reported as Alpers, onset at 4 years, presenting encephalopathy with epilepsy.
Mutations:	A467T, L966R
Age group:	childhood
Age of Onset: 4, Age of Patient: n/a, Age of Death: n/a

Reference:	Nguyen et al, 2006; [PubMed] 173
Description:	Alpers
Mutations:	A467T, L966R
Age group:	unknown
Age of Onset: n/a, Age of Patient: n/a, Age of Death: n/a

Reference:	Hunter et al, 2011; [PubMed] 174
Description:	Focal motor seizures, Epilepsia partialis continua, Developmental Delay or Regression, motor paresis, tremor Abnormal Liver Enzymes, Alpers
Mutations:	A467T, L966R
Age group:	infantile
Age of Onset: 1.42, Age of Patient: n/a, Age of Death: 1.58

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Reference:	Hunter et al, 2011; [PubMed] 175
Description:	Generalized tonic-clonic seizures, Focal motor seizures, Epilepsia partialis continua, Developmental Delay or Regression, visual disturbance, Abnormal Liver Enzymes, liver mtDNA depletion, Alpers
Mutations:	A467T, L966R
Age group:	infantile
Age of Onset: 0.75, Age of Patient: n/a, Age of Death: 1.75

Reference:	McCoy et al, 2011; [PubMed] 176
Description:	focal seizures, elevated blood lactate, elevated liver enzymes, Elevated CSF protein, severe lactic acidosis, severe encephalopathy, Death occurred ten days after admission
Mutations:	A467T, L966R
Age group:	infantile
Age of Onset: 1.42, Age of Patient: n/a, Age of Death: 1.42

Reference:	Blok et al, 2009; [PubMed] 177
Description:	Exercise intolerance, CPEO, retinitis pigmentosa, diabetes, limb girdle weakness. 2nd patient with cataract and myopathy
Mutations:	A467T, P587L
SNPs:	T251I
Age group:	adult
Age of Onset: n/a, Age of Patient: 51, Age of Death: n/a

Reference:	Stewart et al, 2009; [PubMed] 178
Description:	PEO, ptosis, proximal weakness, multiple mtDNA deletions-LPCR. 25% COX-deficient fibers
Mutations:	A467T, P587L
SNPs:	T251I
Age group:	adult
Age of Onset: 45, Age of Patient: n/a, Age of Death: n/a

Reference:	Lovan et al, 2013; [PubMed] 179
Description:	diabetes mellitus 2, congestive heart failure, hypothyroidism, hypertension, depression with psychotic features and gastric bypass surgery. gait difficulties, cognitive impairment, ophthalmoplegia, resting tremor and peripheral neuropathy. Shooting pains and numbness in her lower extremities, occasional rectal incontinence. Presyncopal dizziness. Complicated diabetic retinopathy. sensory ataxia secondary to a sensorimotor polyneuropathy, chronic supranuclear ophthalmoplegia, and a resting tremor of her right hand. bilateral ptosis and marked temporal muscle wasting. Her sensory examination found loss of pinprick sensation, temperature and vibration bilaterally up to her hips. She had bilateral vibration loss at her fingertips. She had loss of proprioception at her toes. She had bilateral dysdiadochokinesia with significant ataxia on finger to nose testing. Arreflexic in her lower extremities. On cognitive testing she was found to have moderate dementia with significant deficits in registration and construction as well as ideomotor apraxia.
Mutations:	A467T, P587L
SNPs:	T251I
Age group:	adult
Age of Onset: 55, Age of Patient: 60, Age of Death: n/a

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Reference:	Blok et al, 2009; [PubMed] 180
Description:	Alpers, died at age four. Sister also died at age 4 .
Mutations:	A467T, S305R
Age group:	childhood
Age of Onset: n/a, Age of Patient: n/a, Age of Death: 4

Reference:	Tang et al, 2011; [PubMed] 181
Description:	Liver failure. 51% mtDNA copy number in muscle, 9% mtDNA copy number in liver, 87% mtDNA copy number in blood.
Mutations:	A467T, S305R
Age group:	infantile
Age of Onset: n/a, Age of Patient: 1, Age of Death: n/a

Reference:	Hunter et al, 2011; [PubMed] 182
Description:	Myoclonic Seizures, Focal motor seizures, Developmental Delay or Regression, visual disturbance, Multi-organ failure, pancreatitis Abnormal Liver Enzymes, Serum Lactate, liver mtDNA depletion, Alpers
Mutations:	A467T, S305R
Age group:	childhood
Age of Onset: 3, Age of Patient: n/a, Age of Death: 3.67

Reference:	Blok et al, 2009; [PubMed] 183
Description:	Epilepsy, liver failure, occipital strokes, and growth retardation, death at age 1.
Mutations:	A467T, A957P
Age group:	infantile
Age of Onset: n/a, Age of Patient: n/a, Age of Death: 1

Reference:	de Vries et al, 2007; [PubMed] 184
Description:	Onset at 8 months with FTT, dementia, hypotonia, seizures, hepatopathy, aplasia cutis, delayed myelinisation. Death at 17 months.
Mutations:	A467T, A957P
Age group:	infantile
Age of Onset: 0.6, Age of Patient: n/a, Age of Death: 1.5

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Reference:	Ferrari et al, 2005; [PubMed] 185
Description:	mild motor retardation was first noted at 6 months. At the age of 16 months, he was admitted to a local hospital for status epilepticus. At 18 months, generalized brain atrophy. epilepsia partialis continua, which was partially controlled by carbamazepine, later switched to oxcarbazepine. Elevated blood lactate. Alpers. He died at 2 years of age after severe complications from liver failure.
Mutations:	A467T, A957P
Age group:	infantile
Age of Onset: 0.5, Age of Patient: n/a, Age of Death: 2

Reference:	Horvath et al, 2006; [PubMed] 186
Description:	Onset at 32 years with encephalopathy, PEO, ataxia, dysphagia, myopathy, neuropathy and cardiomyopathy, hearing loss. Death at 41 years.
Mutations:	A467T, R627W
Age group:	adult
Age of Onset: 32, Age of Patient: n/a, Age of Death: 41

Reference:	Horvath et al, 2006; [PubMed] 187
Description:	Onset at 39 years with PEO, ataxia, myopathy, and hearing loss.
Mutations:	A467T, R627W
Age group:	adult
Age of Onset: 39, Age of Patient: n/a, Age of Death: n/a

Reference:	Horvath et al, 2006; [PubMed] 188
Description:	PEO, SANDO (Horvath 2006 or Van goethem 2003) sensory ataxic neuropathy, PEO, dysarthria.
Mutations:	A467T, R627W
Age group:	adult
Age of Onset: 20, Age of Patient: n/a, Age of Death: n/a

Reference:	Kollberg et al, 2006; [PubMed] 189
Description:	The girl was healthy and developed normally until one year of age when, during a mild respiratory infection, she had repeated multifocal partial seizures with clonic jerking and unconsciousness. The episode was later followed by the development of muscular hypotonia and of myoclonus. Mild psychomotor regression, ataxia, and slightly elevated serum transaminases were noticed. At 3 years of age, a mild infection provoked a prolonged status epilepticus, which lasted 3 weeks and included stroke-like features and rightsided hemiparesis. This was followed by a progressive deterioration of cognitive and motor functions and the development of ptosis and external ophthalmoplegia. Alpers. Febrile infections provoked repetitive status epilepticus with seizures in the form of migrating epilepsia partialis continua. mtDNA Deletions.
Mutations:	A467T, R574W
Age group:	infantile
Age of Onset: 1, Age of Patient: 1.5, Age of Death: 4.333

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Reference:	Kollberg et al, 2006; [PubMed] 190
Description:	mtDNA Deletions. She was healthy until 7 months of age when she, in association with pyelonephritis, had onset of myoclonic seizures and weakness of the left arm and leg. leftsided myoclonic seizures progressing to status epilepticus in the form of migrating EPC and unconsciousness. pneumonia and colitis.
Mutations:	A467T, R574W
Age group:	infantile
Age of Onset: 0.583, Age of Patient: 1, Age of Death: 1.166

Reference:	Spinazzola et al, 2009; [PubMed] 191
Description:	Alpers. Alive at 10 years. Sister died at age 27.
Mutations:	A467T, R574W
Age group:	childhood
Age of Onset: 3, Age of Patient: 10, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 192
Description:	Authors report N/A. 6% mtDNA copy number in blood.
Mutations:	A467T, F749S
Age group:	infantile
Age of Onset: n/a, Age of Patient: 0.8, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 193
Description:	Intractable seizure, abrubt onset of seizure. 15% mtDNA copy number in blood.
Mutations:	A467T, F749S
Age group:	childhood
Age of Onset: n/a, Age of Patient: 6, Age of Death: n/a

Reference:	Nguyen et al, 2006; [PubMed] 194
Description:	Alpers
Mutations:	A467T, F749S
Age group:	unknown
Age of Onset: n/a, Age of Patient: n/a, Age of Death: n/a

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Reference:	Blok et al, 2009; [PubMed] 195
Description:	FTT, died after epilepticus.
Mutations:	A467T, R227P
Age group:	infantile
Age of Onset: n/a, Age of Patient: n/a, Age of Death: 1

Reference:	de Vries et al, 2007; [PubMed] 196
Description:	Severe childhood multi-system disorder, epilepsy and failure to thrive, GI problems, hypotonia, retardation.
Mutations:	A467T, R227P
Age group:	infantile
Age of Onset: 0.5, Age of Patient: n/a, Age of Death: 1

Reference:	Ashley et al, 2008; [PubMed] 197
Description:	Onset at 3 years of age, encephalopathy presenting with epilepsy and movement disorder (ataxia).
Mutations:	A467T, C418R
Age group:	childhood
Age of Onset: 3, Age of Patient: n/a, Age of Death: n/a

Reference:	McCoy et al, 2011; [PubMed] 198
Description:	presented in status epilepticus, with a 24 h history of lethargy and vomiting, ataxia diagnosed at 17 months, diffuse encephalopathy,
Mutations:	A467T, C418R
Age group:	infantile
Age of Onset: 1.42, Age of Patient: n/a, Age of Death: 3.58

Reference:	Kurt et al, 2010; [PubMed] 199
Description:	Psychomotor delay, seizures, liver disease, GI dysmotility, lactic acidosis, ptosis, hearing loss.
Mutations:	A467T, P1073L
Age group:	infantile
Age of Onset: 0.01, Age of Patient: n/a, Age of Death: 0.8

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Reference:	Kurt et al, 2010; [PubMed] 200
Description:	Psychomotor delay, status epilepticus, liver disease, GI dysmotility, lactic acidosis, optic atrophy.
Mutations:	A467T, P1073L
Age group:	infantile
Age of Onset: 0.01, Age of Patient: n/a, Age of Death: 3

Reference:	Tang et al, 2011; [PubMed] 201
Description:	Developmental delay, seizures, abnormal MRI, hypotonia, low in blood.
Mutations:	A467T, C1188R
Age group:	childhood
Age of Onset: n/a, Age of Patient: 3, Age of Death: n/a

Reference:	Khan et al, 2012; [PubMed] 202
Description:	developmental delay, prolonged generalized seizure, hypotonia, epilepsia partialis continua, congestive heart failure, respiratory difficulty, autopsy showed enlarged and yellow liver, symmetrical but multifocal ischemic encephalopathy with laminar necrosis and neuronal degeneration in the cerebral cortex, Mitochondrial DNA copy number in blood was 43% of control values
Mutations:	A467T, C1188R
Age group:	infantile
Age of Onset: 0.75, Age of Patient: n/a, Age of Death: 1.17

Reference:	Wong et al, 2008; [PubMed] 203
Description:	Onset 60 years with ataxia, neuropathy, myopathy, hearing loss, cerebellar atrophy, SANDO/SCAE, PEO.
Mutations:	A467T, G737R
Age group:	adult
Age of Onset: 60, Age of Patient: n/a, Age of Death: n/a

Reference:	Milone et al, 2011; [PubMed] 204
Description:	progressive sensory ataxic neuropathy, ophthalmoparesis, cerebellar ataxia, limb weakness, muscle cramps, sensory hearing loss, dysarthria, dysphagia, constipation, and memory loss, brain MRI was abnormal with evidence of generalized cortical and cerebellar atrophy, evidence of a length-dependent sensory > motor polyneuropathy of axonal type, Multiple mtDNA deletions detected by PCR in blood
Mutations:	A467T, G737R
Age group:	adult
Age of Onset: 53, Age of Patient: 58, Age of Death: n/a

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Reference:	Wong et al, 2008; [PubMed] 205
Description:	Onset 48 years with neuropathy, myopathy, SANDO, lactic acidosis PEO.
Mutations:	A467T, R1138C
Age group:	adult
Age of Onset: 48, Age of Patient: n/a, Age of Death: n/a

Reference:	Milone et al, 2011; [PubMed] 206
Description:	Bilateral ptosis, distal lower limbs paresthesias, dysphagia, imbalance, inattention, ophthalmoparesis, Multiple mtDNA deletions detected by PCR in blood and muscle
Mutations:	A467T, R1138C
Age group:	adult
Age of Onset: 46, Age of Patient: 54, Age of Death: n/a

Reference:	Luoma et al, 2005; [PubMed] 207
Description:	developed progressive blepharoptosis at the age of 20 and ophthalmoplegia during subsequent years, at 35, the patient developed progressive unsteadiness of gait. She noted fatigue, myalgia and cramps, which were triggered by moderate exercise. At 44, restless legs syndrome, deficits in memory and concentration, and suffered from recurrent episodes of depression, at 46 showed bilateral blepharoptosis, limited eye movements in all directions except downwards, lateral rotatory nystagmus and slight upbeat nystagmus in upward gaze, but no saccades. She had facial muscle weakness, dysarthria and slight proximal muscle weakness. She had glove and stockinglike hypoesthesia, distally impaired vibration sense, absent ankle reflexes and weak other tendon reflexes, as well as mild dysmetria. Her gait was broad-based, with further impairment with eyes closed. Tandem gait was impaired. deltoid muscle showed myopathic features, structurally abnormal mitochondria with para-crystalline inclusions,
Mutations:	A467T, R627Q
SNPs:	Q1236H
Age group:	adult
Age of Onset: 20, Age of Patient: 46, Age of Death: n/a

Reference:	Hanisch et al, 2014; [PubMed] 208
Description:	Ataxia, ptosis, myalgia, sensory neuropathy, motor neuropathy, axonal neuropathy, demyelinating neuropathy.
Mutations:	A467T, R627Q
Age group:	adult
Age of Onset: 46, Age of Patient: 50, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 209
Description:	Alpers, chorea, microcephaly, leukodystrophy, Seizures, Dementia, developmental delay.
Mutations:	A467T
SNPs:	PNF, Q1236H
Age group:	infantile
Age of Onset: 1.5, Age of Patient: n/a, Age of Death: n/a

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Reference:	Hunter et al, 2011; [PubMed] 210
Description:	Developmental Delay or Regression, hypotonia, vomiting, Abnormal Liver Enzymes, liver mtDNA depletion, clinical diagnosis of infantile hepatopathy
Mutations:	A467T, H277L, R232H
Age group:	infantile
Age of Onset: 0.125, Age of Patient: n/a, Age of Death: 0.25

Reference:	Hunter et al, 2011; [PubMed] 211
Description:	Developmental Delay or Regression, motor paresis, hypotonia, vomiting, Abnormal Liver Enzymes, Serum Lactate, liver mtDNA depletion, clinical diagnosis of infantile hepatopathy
Mutations:	A467T, H277L, R232H
Age group:	infantile
Age of Onset: 0.17, Age of Patient: n/a, Age of Death: 0.25

Reference:	Van Goethem et al, 2001; [PubMed] 212
Description:	ptosis, opthalmoplegia, dysphonia, dysphagia, distal sensory neuropathy, areflexia.
Mutations:	A467T
SNPs:	R3P
Age group:	adult
Age of Onset: 30, Age of Patient: 58, Age of Death: n/a

Reference:	Van Goethem et al, 2001; [PubMed] 213
Description:	ptosis, opthalmoplegia, dysphonia, dysphagia, muscle weakness, loss of weight, distal sensory neuropathy, areflexia.
Mutations:	A467T
SNPs:	R3P
Age group:	adult
Age of Onset: 20, Age of Patient: 61, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 214
Description:	Clinical indications reported as N/A only information provided is age of patient and 71% mtDNA copy number in blood.
Mutations:	A467T, F88L
Age group:	adult
Age of Onset: n/a, Age of Patient: 42, Age of Death: n/a

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Reference:	Tang et al, 2011; [PubMed] 215
Description:	Dementia/encephalopathy, headaches/migraines, ataxia, seizures, peripheral neuropathy, exercise intolerance, muscle weakness, easy fatigability, CPEO, abnormal EMG/NCV, hearing loss, cerebellar atrophy, abnormal MRI. 82% mtDNA copy number in blood.
Mutations:	A143V, A467T
Age group:	adult
Age of Onset: n/a, Age of Patient: 49, Age of Death: n/a

Reference:	de Vries et al, 2007; [PubMed] 216
Description:	Onset at 4 months with FTT, dementia, hypotonia, seizures, myoclonus, GI problems, hepatopathy, hearing loss, delayed myelinisation. Death at 10 months
Mutations:	A467T, R227W
Age group:	infantile
Age of Onset: 0.3, Age of Patient: n/a, Age of Death: 0.8

Reference:	Ashley et al, 2008; [PubMed] 217
Description:	onset at 2 years with encephalopathy no hepatopathy.
Mutations:	A467T, R417T
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: n/a

Reference:	Sarzi et al, 2007; [PubMed] 218
Description:	Alpers, cerebellar ataxia at age 2, seizures at age 3, RC deficiency in liver, hepatocellular insufficiency after valproate treatment at age 3.6, death at age 3.8. 8% mtDNA copy number in liver.
Mutations:	A467T, L428P
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: 3.8

Reference:	Tang et al, 2011; [PubMed] 219
Description:	Hypotonia, hepatic failure, elevated transaminases, respiratory deficiency/failure, FTT, developmental delay, GI reflux, delayed gastric emptying, dicarboxylic aciduria, high CSF protein, abnormal muscle histology, COX deficiency, vomiting. 12% mtDNA copy number in muscle, 42% mtDNA copy number in blood, ETC low. ptosis, poor head control. Central hypotonia, and absent deep tendon reflexes. He developed hypoxia, ascites, tachycardia, intermittent fevers, and sepsis. Some severely cytochrome oxidase-deficient muscle fibers were present.
Mutations:	A467T, S1095R
Age group:	infantile
Age of Onset: 0.333, Age of Patient: n/a, Age of Death: 0.583

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Reference:	Tang et al, 2011; [PubMed] 220
Description:	Encephalopathy/dementia, liver failure, cholestasis, lactic acidosis, altered mental status. 47% mtDNA copy number in muscle, 8% mtDNA copy number in liver, ETC low.
Mutations:	A467T, R807C
Age group:	infantile
Age of Onset: n/a, Age of Patient: 1, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 221
Description:	Developmental delay, hypotonia, seizures, hepatic failure, elevated transaminases, renal tubular disease, failure to thrive. 18% mtDNA copy number in blood.
Mutations:	A467T, R807H
Age group:	infantile
Age of Onset: n/a, Age of Patient: 1, Age of Death: n/a

Reference:	Wong et al, 2008; [PubMed] 222
Description:	Onset 1 years with dementia, seizures, and liver failure. Alpers
Mutations:	A467T, L886P
Age group:	infantile
Age of Onset: 1, Age of Patient: 1, Age of Death: n/a

Reference:	Horvath et al, 2006; [PubMed] 223
Description:	Onset at .5 years with encephalopathy, liver dysfunction, cardiopathy, diagnosed as Alpers, death at 1.3 years.
Mutations:	A467T, K1191N
Age group:	infantile
Age of Onset: 0.5, Age of Patient: n/a, Age of Death: 1.3

Reference:	Stewart et al, 2009; [PubMed] 224
Description:	Alpers, seizures, myoclonus, liver failure, elevated serum lactate, COX deficient fibers present in muscle and liver, mtDNA depletion in liver.
Mutations:	A467T, L605R
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: n/a

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Reference:	Tang et al, 2011; [PubMed] 225
Description:	VPA induced liver failure. 50% mtDNA copy number in muscle.
Mutations:	A467T, G588D
Age group:	infantile
Age of Onset: n/a, Age of Patient: 2, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 226
Description:	Developmental delay, intractable seizure/refractory, hepatic failure, cerebellar atrophy, liver failure. 87% mtDNA copy number in blood.
Mutations:	A467T, H754Q
Age group:	infantile
Age of Onset: n/a, Age of Patient: 2, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 227
Description:	Dementia/encephalopathy, ataxia, peripheral neuropathy, ptosis, abnormal muscle histology, abnormal muscle ultrastructure, abnormal respiratory enzyms, large mitochondrial/ proliferation, COX deficiency, ragged red fibers. 100% mtDNA copy number in blood.
Mutations:	A467T, R597W
Age group:	adult
Age of Onset: n/a, Age of Patient: 26, Age of Death: n/a

Reference:	Tang et al, 2011; [PubMed] 228
Description:	Encephalopathy, seizures, pancreatitis, hepatic failure, elevated transaminases, respiratory deficiency/failure, lactic acidosis, mycoplasma infection, pentobarbital induced liver failure. 57% mtDNA copy number in muscle, 78% mtDNA copy number in blood, Complex IV 20%.
Mutations:	A467T, L1113P
Age group:	infantile
Age of Onset: n/a, Age of Patient: 1, Age of Death: n/a

Reference:	Baruffini et al, 2011; [PubMed] 229
Description:	Seizures onset at age 1, death via VPA induced liver failure at age 2.
Mutations:	A467T, P625R
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: 2

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Reference:	Agostino et al, 2003; [PubMed] 230
Description:	PEO, bilateral ptosis, severe limita- tion of ocular motility, and a mosaic distribution of ragged-red and cytochrome c oxidase–negative fibers in the muscle biopsy. All patients had multiple deletions of muscle mtDNA.
Mutations:	A467T, S1104C
Age group:	adult
Age of Onset: 48, Age of Patient: n/a, Age of Death: n/a

Reference:	Di Fonzo et al, 2003; [PubMed] 231
Description:	PEO, age of onset 65 years.
Mutations:	A467T, G268A
Age group:	adult
Age of Onset: 65, Age of Patient: n/a, Age of Death: n/a

Reference:	Echaniz-Laguna et al, 2010; [PubMed] 232
Description:	presented with blurred vision, elevated CSF protein, she successively developed various neurological signs, ie, bilateral external ophthalmoplegia, ataxia, hearing impairment, and severe depression, ptosis, myopathy, cardiomyopathy, and dysphagia, Muscle biopsy performed at 63 years of age showed numerous ragged-red fibers and multiple mtDNA deletions
Mutations:	A467T, R275Q
Age group:	adult
Age of Onset: 30, Age of Patient: 63, Age of Death: n/a

Reference:	Lax et al, 2012a; [PubMed] 233
Description:	CPEO, Ptosis, Peripheral neuropathy, COX-deficient fibers, ragged red fibers, presence of mitochondrial dna deletions in muscle, Sensory and motor neuronopathy, Distal and proximal neurogenic change
Mutations:	A467T, R1096C
Age group:	juvenile
Age of Onset: 17, Age of Patient: 42, Age of Death: n/a

Reference:	Amiot et al, 2009; [PubMed] 234
Description:	Peripheral neuropathy, PEO, ataxia
Mutations:	A467T, M919T
Age group:	adult
Age of Onset: 23, Age of Patient: 41, Age of Death: n/a

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Reference:	Sitarz et al, 2014; [PubMed] 235
Description:	Epilepsy, Ataxia, Myopathy.
Mutations:	A467T, S1104F
Age group:	childhood
Age of Onset: n/a, Age of Patient: 5, Age of Death: n/a

Reference:	McFarland et al, 2008; [PubMed] 236
Description:	Presented with epilepsy following minor head trauma, 2 months after valproate treatment developed persistent vomiting and encephalopathy, deranged liver function tests, prolonged clotting, elevated ammonia, and a high plasma lactate, Hepatic dysfunction progressed,
Mutations:	A467T, Q879H, T885S
SNPs:	E1143G
Age group:	infantile
Age of Onset: 2, Age of Patient: n/a, Age of Death: n/a

Patient data are sorted by mutation combination frequency.

Reference:	Blok et al, 2009; [PubMed] 1
Description:	Ptosis, CPEO, polyneuropathy, cerebellar ataxia, dysarthria.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	adult
Age of Onset: n/a, Age of Patient: 47, Age of Death: n/a

Reference:	Ferrari et al, 2005; [PubMed] 2
Description:	An apparently myogenic torticollis was noticed after a few months of life; at 10 months, he had two episodes of sudden head drop, followed by the onset of psychomotor arrest/ regression, hypotonia, ataxia and focal myoclonus of the right upper limb. In the following weeks, the myoclonus became subcontinuous, and was associated with rapidly progressive, severe generalized hypotonia and weakness requiring ventilatory assistance. Seizures were partially controlled with a combination of topiramate, clobazam and phenylbarbiturate. symmetrical lesions of the basal ganglia, thalami, cerebellar dentate nuclei and left occipital cortical and subcortical regions. abnormal accumulation of lactic acid in the putamen and a reduction of the N-acetyl aspartate. cholestatic jaundice, hypoglycaemia and hypocoagulation. The diagnostic conclusion was Alpers syndrome.
Mutations:	W748S
SNPs:	E1143G, PNF
Age group:	infantile
Age of Onset: 0.2, Age of Patient: n/a, Age of Death: 2.5

Reference:	Ferrari et al, 2005; [PubMed] 3
Description:	disease-free interval in the first 4 months after birth, followed by persistent vomiting, epileptic crises with loss of eye contact, and myoclonus in the upper limbs with secondary generalization and loss of consciousness. Persistent myoclonus in the upper limbs was associated with profound hypotonia and loss of eye contact. cortical atrophy and leukoencephalopathy in the subcortical areas of the frontal lobes. progressive hepatic failure with enlarged liver, hypoalbuminaemia and predominantly cholestatic jaundice led to the death of the child at 8 months of age.
Mutations:	W748S
SNPs:	E1143G, PNF
Age group:	infantile
Age of Onset: 0.3, Age of Patient: n/a, Age of Death: 0.67

Reference:	Isohanni et al, 2011; [PubMed] 4
Description:	Partial status epilepticus, epilepsia partialis, continua, hemiparesis, myoclonus, loss of vision, optical atrophy, pschomotor regression, liver dysfunction, death via pneumonia.
Mutations:	G848S, W748S
SNPs:	E1143G
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: 11

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Reference:	Isohanni et al, 2011; [PubMed] 5
Description:	developmental delay, vomiting, partial status epilepticus, epilepsia partialis continua, myoclonus, ataxia, alive at age 3.
Mutations:	T914P, W748S
SNPs:	E1143G
Age group:	infantile
Age of Onset: 2.5, Age of Patient: 3, Age of Death: n/a

Reference:	Isohanni et al, 2011; [PubMed] 6
Description:	epilepsy, vomiting, lowered consciousness, partial status epilepticus, epilepsia partialis continua, myoclonus, pschomotor regression, liver failure before valproate treatment, death via pneumonia. 72-76% mtDNA copy number in muscle.
Mutations:	R807C, W748S
SNPs:	E1143G
Age group:	infantile
Age of Onset: 1, Age of Patient: n/a, Age of Death: 3

Reference:	Kollberg et al, 2006; [PubMed] 7
Description:	Alpers, age of onset 6 months, age of death 13 months. 41% mtDNA copy number. During the first 6 months of life, he was considered healthy, but was irritable with colic-like symptoms. failure to thrive, delayed motor development. myoclonus. leftsided hemiparesis.
Mutations:	R232H, W748S
SNPs:	E1143G
Age group:	infantile
Age of Onset: 0.5, Age of Patient: n/a, Age of Death: 1.08

Reference:	Kollberg et al, 2006; [PubMed] 8
Description:	Ragged Red Fibers, COX-Deficient Fibers. mtDNA depletion. He was healthy and his development was normal until 5 months of age. He developed failure to thrive and muscular hypotonia. At 4 years of age, he developed myoclonus, which was first limited to the right eye and the right side of the mouth, but then progressed to epilepsia partialis continua of the entire left side of the body without loss of consciousness. He has developed a complex movement disorder and cognitive impairment, but contact, speech, and memory functions have been retained. He also had ptosis and uncontrolled and uncoordinated movements, especially in his arms.
Mutations:	E1163G, W748S
SNPs:	E1143G
Age group:	infantile
Age of Onset: 0.417, Age of Patient: n/a, Age of Death: n/a

Reference:	Kollberg et al, 2006; [PubMed] 9
Description:	Started as an ataxic syndrome, Alpers, ragged red fibers, COX-deficient fibers, mtDNA deletions. mtDNA copy numbers 1.6 fold. She was healthy and developed normally until her late preschool years when she developed slowly progressive ataxia. Occasional myoclonic seizures, and at 13 years of age, valproate treatment was started because of occipital seizures. ataxia, dementia, and cortical blindness. She developed refractory seizures, including multifocal EPC, status epilepticus, and myoclonus.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	childhood
Age of Onset: 5, Age of Patient: 13, Age of Death: 14

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Reference:	Kollberg et al, 2006; [PubMed] 10
Description:	psychomotor regression, refractory seizures, stroke-like episodes, hepatopathy, and ataxia. COX-deficient muscle fibers, mtDNA deletions, 160% mtDNA copy number. He was normal until 11 years of age when he developed mild tremor and ataxia. At 13 years of age, he reported occasional migraine-like headaches and was found to have mild ataxia and myoclonus. generalized seizures. mild leftsided hemiparesis, external ophthalmoplegia, and peripheral neuropathy.
Mutations:	A467T, W748S
SNPs:	E1143G
Age group:	childhood
Age of Onset: 11, Age of Patient: 24, Age of Death: n/a

Reference:	Naimi et al, 2006; [PubMed] 11
Description:	SCAE, age of onset 20, death at 27, ptosis and multiple deletions in muscle.
Mutations:	L304R, W748S
SNPs:	E1143G
Age group:	adult
Age of Onset: 20, Age of Patient: n/a, Age of Death: 27

Reference:	Sarzi et al, 2007; [PubMed] 12
Description:	Myoclonus, epilepsy, Psychomotor retardation, Alpers syndrome, steatosis
Mutations:	W748S
SNPs:	E1143G, PNF
Age group:	infantile
Age of Onset: 0.25, Age of Patient: n/a, Age of Death: n/a