Clinical and genetic study of Friedreich ataxia in an Australian population

Delatycki, Martin B., Paris, Damien B.B.P., McKinlay Gardner, R.J., Nicholson, Garth A., Nassif, Najah, Storey, Elsdon, MacMillan, John C., Collins, Veronica, Williamson, Robert, and Forrest, Susan M. (1999) Clinical and genetic study of Friedreich ataxia in an Australian population. American Journal of Medical Genetics, 87 (2). pp. 168-174.

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Abstract

Friedreich ataxia is an autosomal recessive disorder caused by mutations in the FRDA gene that encodes a 210-amino acid protein called frataxin. An expansion of a GAA trinucleotide repeat in intron 1 of the gene is present in more than 95% of mutant alleles. Of the 83 people we studied who have mutations in FRDA, 78 are homozygous for an expanded GAA repeat; the other five patients have an expansion in one allele and a point mutation in the other. Here we present a detailed clinical and genetic study of a subset of 51 patients homozygous for an expansion of the GAA repeat. We found a correlation between the size of the smaller of the two expanded alleles and age at onset, age into wheelchair, scoliosis, impaired vibration sense, and the presence of foot deformity. There was no significant correlation between the size of the smaller allele and cardiomyop athy, diabetes mellitus, loss of proprioception, or bladder symptoms. The larger allele size correlated with bladder symptoms and the presence of foot deformity. The duration of disease is correlated with wheelchair use and the presence of diabetes, scoliosis, bladder symptoms and impaired proprioception, and vibration sense but no other complications studied.

Item ID: 34531
Item Type: Article (Refereed Research - C1)
Keywords: Friedreich ataxia, genotype, phenotype
ISSN: 1552-4876
Date Deposited: 27 Aug 2014 04:42
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1109 Neurosciences > 110905 Peripheral Nervous System @ 50%
11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110311 Medical Genetics (excl Cancer Genetics) @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970111 Expanding Knowledge in the Medical and Health Sciences @ 40%
92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920110 Inherited Diseases (incl. Gene Therapy) @ 60%
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