Localization of Friedreich ataxia phenotype with selective vitamin E deficiency to chromosome 8q by homozygosity mapping

C. B. Hamida, N. Doerflinger, S. Belal, C. Linder, L. Reutenauer, C. Dib, G. Gyapay, A. Vignal, D. Le Paslier, D. Cohen, M. Pandolfo, V. Mokini, G. Novelli, F. Hentati, M. B. Hamida, J. L. Mandel, M. Koenig

Research output: Contribution to journalArticle

Abstract

Friedreich ataxia and ataxia with selective vitamin E deficiency (AVED) share very similar clinical phenotypes. We have mapped the AVED locus to proximal 8q with only three large consanguinous Tunisian families, representing to our knowledge the first use of homozygosity mapping for primary linkage analysis. Subsequently, three additional families showed linkage with the same markers. A maximum lod score of 17.9 was obtained at θ = 0 for the haplotype D8S260-D8S510, consisting of the two closest markers. With only 6 families, the AVED locus is therefore mapped precisely as illustrated by the lod-1 confidence interval of 2.4 cM on either side of D8S260-D8S510. Isolation of a yeast artificial chromosome contig >800 kilobases (kb) showed that D8S260 and D8S510 are less than 400 kb apart.

Original languageEnglish
Pages (from-to)195-200
Number of pages6
JournalNature Genetics
Volume5
Issue number2
DOIs
Publication statusPublished - 1993

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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    Hamida, C. B., Doerflinger, N., Belal, S., Linder, C., Reutenauer, L., Dib, C., Gyapay, G., Vignal, A., Le Paslier, D., Cohen, D., Pandolfo, M., Mokini, V., Novelli, G., Hentati, F., Hamida, M. B., Mandel, J. L., & Koenig, M. (1993). Localization of Friedreich ataxia phenotype with selective vitamin E deficiency to chromosome 8q by homozygosity mapping. Nature Genetics, 5(2), 195-200. https://doi.org/10.1038/ng1093-195