| 2 patient data entries in database for mutations Q1236H and Q1236H. | Entry #
 | | Mutations |  | allele 1 | allele 2 | 
 | Clinical representation | Symptoms | Age group | Age of onset | Age of patient | Age of death | Reference |  |  |  | 226 | R1096C3 Q1236H
 
 | R1096C3 Q1236H
 
 | Onset at 2 years with encephalopathy, hepatopathy, and myoclonus achalasia.  Diagnosed as Alpers. |  |  | 2 | n/a | n/a | Horvath et al, 2006; [view data] |  | 640 | Q1236H R1096C3
 
 | Q1236H R1096C3
 
 | developmental delay, dementia, seizures, Alpers, Family history of Alpers syndrome. |  |  | 1 | n/a | n/a | Wong et al, 2008; [view data] | 
 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: 2Avg age of onset in displayed cases: 1.5
 Std dev in onset in displayed cases: 0.5
 
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