POLG Pathogenicity Prediction Server
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2 patient data entries in database for mutations Q497H and Q497H.

Entry
#
Mutations
allele 1allele 2
Clinical representationSymptomsAge groupAge of onsetAge of patientAge of deathReference
593E1143G
Q497H2
W748S5
E1143G
Q497H2
W748S5
Ataxia, sensory ataxia, dysarthria, nystagmus, cognitive dysfunction, axonal neuropathy, demyelinating neuropathy. This man presented at age 26 with unsteadiness. Examination showed an ataxic gait, cerebellar dysarthria, myoclonic jerks of his head and facial muscles, mild limitation of horizontal eye movement, and horizontal nystagmus in the direction of gaze, with an additional vertical element when looking down. There were distal amyotrophy, absent reflexes in the legs, and a symmetric loss of all sensory modalities below the knee. Romberg’s test was positive. Episodes of depression. At age 31 he has an almost complete ophthalmoplegia, cerebellar dysarthria, myoclonus involving face and arms, truncal ataxia, and symmetric dysmetria.
-myoclonic seizures
-movement disorder (ataxia)
-sensory ataxia
-demyelinating neuropathy
-ophthalmoplegia
-dysarthria
-nystagmus
adult
2338n/aWinterthun et al, 2005;

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594E1143G
Q497H2
W748S5
E1143G
Q497H2
W748S5
Headaches, a focal epilepsy with secondary generalisation, occipital epilepsy, dysarthria, nystagmus, cognitive dysfunction. Demyelinating neuropathy, axonal neuropathy. headaches preceded by visual symptoms, nausea, vomiting, and unsteadiness diagnosed as migraine. Shortly after, she had the first of a series of tonic-clonic seizures preceded by headache. Examination showed horizontal and vertical nystagmus, gait ataxia.
-epilepsy
-movement disorder (ataxia)
-demyelinating neuropathy
-headache/ migraine
-vomiting
-dysarthria
-nystagmus
juvenile
1518n/aWinterthun et al, 2005;

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1-5 pathogenic cluster assignment of mutations. Mutations displayed without a superscript number are outside of the assigned pathogenic clusters. See cluster definitions for details.

Number of displayed patient cases: 2
Avg age of onset in displayed cases: 19.0
Std dev in onset in displayed cases: 4.0

Search criteria for patient entries:
Mutations Entry IDs Clusters Reference Residue range
Mutations:
Allele 1:Allele 2:
Separate multiple mutations with commas.
Use "PNF" for non-missense mutations.
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