Heterogeneous clinical presentation of the mtDNA NARP/T8993G mutation.
To obtain a better molecular definition of patients with syndromic retinitis pigmentosa, we screened for mitochondrial DNA (mtDNA) alterations of the two ATPase genes and 22 tRNA-coding sequences in 10 patients whose features resembled NARP (neuropathy, ataxia, and retinitis pigmentosa) syndrome. In two patients, one of whom showed features mimicking Kearns-Sayre syndrome, we identified a heteroplasmic T8993G mutation (average 80%) in the mitochondrial ATPase 6 gene. There was no mutated mtDNA in muscle and leukocytes from the mother of one patient or in leukocytes from his brother, suggesting a rapid segregation of the mutated nucleotide. MtDNA analysis should be considered in the differential diagnosis of patients with syndromic retinitis pigmentosa.
Santorelli
F M
FM
H. Houston Merritt Clinical Research Center for Muscular Dystrophy and Related Diseases, Department of Neurology, College of Physicians & Surgeons, Columbia University, New York, NY.
Tanji
K
K
Shanske
S
S
DiMauro
S
S
D000328:Adult; D004272:DNA, Mitochondrial / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D009154:Mutation / Q000235:genetics; D011110:Polymorphism, Genetic / Q000235:genetics*; D012174:Retinitis Pigmentosa / Q000235:genetics*
D004272:DNA, Mitochondrial