Friedreich's ataxia.
Alper G, Narayanan V
Pediatric Neurology (2003)
Category: mitochondrial diseases ¤ Added: Aug 06, 2003 ¤ Rating: ◊◊
Friedreich's ataxia, the most common hereditary ataxia, is caused by expansion of a GAA triplet located within the first intron of the frataxin gene on chromosome 9q13. There is a clear correlation between size of the expanded repeat and severity of the phenotype. Frataxin is a mitochondrial protein that plays a role in iron homeostasis. Deficiency of frataxin results in mitochondrial iron accumulation, defects in specific mitochondrial enzymes, enhanced sensitivity to oxidative stress, and eventually free-radical mediated cell death. Friedreich's ataxia is considered a nuclear encoded mitochondrial disease.This review discusses the major and rapid progress made in Friedreich's ataxia from gene mapping and identification of the gene to pathogenesis and encouraging therapeutic implications.