Human Molecular Genetics, Vol 6, 111-116, Copyright © 1997 by Oxford University Press
G Levy, F Levi-Acobas, S Blanchard, S Gerber, D Larget-Piet, V Chenal, XZ Liu, V Newton, KP Steel, SD Brown, A Munnich, J Kaplan, C Petit and D Weil
Usher syndrome is recognized as the most frequent cause of hereditary
deaf-blindness. Usher syndrome type I (USH1), the most severe form of the
disease, is characterized by profound congenital sensorineural deafness,
constant vestibular dysfunction, and retinitis pigmentosa of prepubertal
onset. This form is genetically heterogeneous and five loci (USH1A-E) have
been mapped thusfar. However, only the gene responsible for USH1 B (which
accounts for approximately 75% of USH1 cases) has been characterized. It
encodes a long-tailed unconventional myosin, myosin VIIA, with a predicted
2215 amino acid sequence. Primers covering the complete myosin VIIA coding
sequence as well as the 3' non coding sequence were designed, allowing
direct sequence analysis of each of the 48 coding exons and flanking splice
sites in seven patients affected by USH1. Four novel mutations were thereby
identified. The possibility should now be considered of a sequence-based
prenatal diagnosis in some of the families affected by this very severe
form of Usher syndrome.
ARTICLES
Myosin VIIA gene: heterogeneity of the mutations responsible for Usher syndrome type IB
Unite de Genetique Moleculaire Humaine (URA CNRS 1968), Institut Pasteur, Paris, France.
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