Human Genetics

, Volume 103, Issue 1, pp 102–105

Mutation of the start codon in the FRDA1 gene: linkage analysis of three pedigrees with the ATG to ATT transversion points to a unique common ancestor

  • C. Zühlke
  • Franco Laccone
  • Mireille Cossée
  • Alfried Kohlschütter
  • Michel Koenig
  • Eberhard Schwinger
Original investigation

DOI: 10.1007/s004390050791

Cite this article as:
Zühlke, C., Laccone, F., Cossée, M. et al. Hum Genet (1998) 103: 102. doi:10.1007/s004390050791

Abstract

Friedreich ataxia (FRDA) is a progressive neurodegenerative disorder caused by loss-of-function mutations in the gene encoding frataxin. Most patients with FRDA have trinucleotide repeat expansions in both alleles of the FRDA1 gene. In patients heterozygous for the expansion the second allele may be inactivated by a point mutation. We identified the ATG→ATT (M1I) mutation of the start codon in three independent families. Individuals with symptoms of FRDA in these families are compound heterozygous for the repeat expansion and the ATG mutation. To look for a common founder of the M1I mutation, a detailed linkage analysis employing six polymorphic chromosome 9 markers was performed. We found complete haplotype identity for two of the three chromosomes with the point mutation. The third case shows partial conformity and may be the result of a single recombination event.

Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • C. Zühlke
    • 1
  • Franco Laccone
    • 2
  • Mireille Cossée
    • 3
  • Alfried Kohlschütter
    • 4
  • Michel Koenig
    • 3
  • Eberhard Schwinger
    • 1
  1. 1.Universität Lübeck, Institut für Humangenetik, Ratzeburger Allee 160, D-23538 Lübeck, Germany e-mail: zuehlke@medinf.mu-luebeck.de, Tel.: +49-451-500-2620, Fax: +49-451-500-4187DE
  2. 2.Universität Göttingen, Institut für Humangenetik, Gosslerstrasse 12 D, D-37073 Göttingen, GermanyDE
  3. 3.IGBMC, 1 rue Laurent Fries, F-67404 Strasbourg-Illkirch, FranceFR
  4. 4.Kinderklinik des UKE, Martinistrasse 52, D-20251 Hamburg, GermanyDE