title: Friedreich's ataxia phenotype not linked to chromosome 9 and associated with selective autosomal recessive vitamin E deficiency in two inbred Tunisian families.
abstract: Friedreich's ataxia (FA) is an autosomal recessive neurodegenerative disorder, the disease locus (FRDA) of which has been assigned to 9q13-q21.1 by genetic linkage analysis in affected families. We report two large inbred Tunisian families with FA manifestations that did not show the expected linkage. The disease locus could be excluded from a large (12 cMo) region around FRDA. This is the first report providing evidence for nonallelic genetic heterogeneity for the FA clinical phenotype. On subsequent analysis, all patients had very low levels of serum vitamin E whereas the parents and healthy sibs had normal vitamin E levels. This establishes that the selective vitamin E deficiency with normal fat absorption is an autosomal recessive trait, which is associated in the two families reported here with the FA phenotype.
authors.affiliation: Institut National de Neurologie, Tunis, Tunisia.
authors.forename: M
authors.initials: M
authors.lastname: Ben Hamida
authors.forename: S
authors.initials: S
authors.lastname: Belal
authors.forename: G
authors.initials: G
authors.lastname: Sirugo
authors.forename: C
authors.initials: C
authors.lastname: Ben Hamida
authors.forename: K
authors.initials: K
authors.lastname: Panayides
authors.forename: P
authors.initials: P
authors.lastname: Ionannou
authors.forename: J
authors.initials: J
authors.lastname: Beckmann
authors.forename: J L
authors.initials: JL
authors.lastname: Mandel
authors.forename: F
authors.initials: F
authors.lastname: Hentati
authors.forename: M
authors.initials: M
authors.lastname: Koenig
mesh_terms: D000328:Adult; D002899:Chromosomes, Human, Pair 9; D003241:Consanguinity; D005260:Female; D005621:Friedreich Ataxia / Q000150:complications / Q000235:genetics*; D008040:Genetic Linkage; D006801:Humans; D008126:Lod Score; D008297:Male; D010641:Phenotype; D014416:Tunisia; D014811:Vitamin E Deficiency / Q000150:complications / Q000235:genetics*