Journal Article

Founder <i>TIGR/myocilin</i> mutations for glaucoma in the Québec population

Mathieu Faucher, Jean-Louis Anctil, Marc-André Rodrigue, Annie Duchesne, Dan Bergeron, Pierre Blondeau, Gilles Côté, Stéphane Dubois, Josée Bergeron, Rose Arseneault, Jean Morissette and Vincent Raymond

in Human Molecular Genetics

Volume 11, issue 18, pages 2077-2090
Published in print September 2002 | ISSN: 0964-6906
Published online September 2002 | e-ISSN: 1460-2083 | DOI:
Founder TIGR/myocilin mutations for glaucoma in the Québec population

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Primary open-angle glaucoma (POAG) is a complex disorder characterized by a progressive and treatable degeneration of the optic nerve. TIGR/myocilin (MYOC) gene mutations are found in ∼4% of all POAG patients. Populations with frequent founder effects, such as the French-Canadians, offer unique advantages to implement genetic testing for the disorder. To assess molecular diagnosis for POAG in this population, we determined the prevalence of TIGR/MYOC mutations in 384 unrelated glaucoma patients, 38 ocular hypertensive subjects and 18 affected families (180 patients). We further analyzed the clinical features associated with these variations. Nine coding sequence variants were defined as mutations causing mostly, but not exclusively, POAG. Four families segregated distinct mutations (Gly367Arg, Gln368Stop, Lys423Glu and Pro481Leu), while 14 unrelated glaucoma patients harbored six known mutations (Thr293Lys, Glu352Lys, Gly367Arg, Gln368Stop, Lys423Glu and Ala445Val) and two novel (Ala427Thr and Arg126Trp). The frequencies of these mutations were respectively 3.8% and 22.2% in the unrelated and family studies. The Gly367Arg and Lys423Glu variants caused the earliest ages at onset. When achievable, assement of relatives of unrelated mutation carriers showed the Arg126Trp and Gly367Arg to be familial. Characteristic allele signatures, indicative of specific founder effects, were observed for five of the six mutations conveyed by at least two patients. Recombination probability estimates suggested that the French-Canadian population had most probably inherited these six mutations from 7–10 Québec settlers. Our data demonstrated that genetic screening for TIGR/MYOC mutations should be offered to glaucoma families and to close relatives of unrelated patients aware of a family history for the disorder.

Journal Article.  10414 words.  Illustrated.

Subjects: Genetics and Genomics

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