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  • Title: Complete FXN deletion in a patient with Friedreich's ataxia.
    Author: van den Ouweland AM, van Minkelen R, Bolman GM, Wouters CH, Becht-Noordermeer C, Deelen WH, Deelen-Manders JM, Ippel EP, Saris J, Halley DJ.
    Journal: Genet Test Mol Biomarkers; 2012 Sep; 16(9):1015-8. PubMed ID: 22691228.
    Abstract:
    Most patients (98%) with Friedreich's ataxia (FRDA) are homozygous for the GAA repeat expansion in FXN. Only a few compound heterozygous patients with an expanded repeat on one allele and a point mutation or an intragenic FXN deletion on the other allele are described. In a minority of the patients only a heterozygous pattern of the repeat expansion can be detected. Using array analysis after GAA repeat expansion testing, we identified a FRDA patient who is compound heterozygous for an expanded GAA repeat and a complete FXN deletion. Since not only repeat expansions and point mutations, but also large rearrangements can be the underlying cause of FRDA, a quantitative test should also be performed in case a patient shows only one allele with an expanded GAA repeat in FXN.
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