Frequencies of cystic fibrosis mutations in the Maine population: high proportion of unknown alleles in individuals of French-Canadian ancestry |
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Authors: | J K Bayleran Hailing Yan Catherine A Hopper Elizabeth M Simpson |
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Institution: | (1) Genetics Program, Eastern Maine Medical Center, 489 State Street, Bangor, ME 04401, USA Fax: +1-207-973-7354 E-mail: janetb@jax.org, US;(2) The Jackson Laboratory, 600 Main Street, Bar Harbor, ME 04609, USA, US |
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Abstract: | Cystic fibrosis (CF) is one of the most common severe autosomal recessive disorders in Caucasian populations. A mutation
in the cystic fibrosis transmembrane conductance regulator (CFTR) gene causes this disorder. Reported here is the first analysis
of CF mutations in the Maine population. We have screened 263 CF chromosomes for 16 previously reported mutations. Analysis
of DNA from 124 apparently unrelated CF patients and 15 obligate carrier parents (whose partner and affected child were unavailable
for study) resulted in the identification of 91% of the CF alleles and complete genotyping of 85% of the patients. The frequencies
(%) of these mutations in the Maine population are ΔF508 (75% of the chromosomes), G85E (0.76), R117H (0.76), I148T (1.1),
621+1G→T (1.1), 711+1G→T (3.0), A455E (1.1), 1717-1G→A (1.1), G542X (1.9), G551D (1.9), R560T (0.76), Y1092X (0.38), W1282X
(0.38), and N1303K (1.5). The exon 10 mutation, ΔI507, and the exon 11 mutation, R553X, were not observed. Surprisingly, whereas
only 5% of the alleles remain unidentified in the non-French population, the unidentified proportion in the French population
is 19%. CF testing for the Maine population will be further improved as the as yet unidentified CF mutations in this population
are characterized.
Received: 17 January 1996 / Revised: 28 February 1996 |
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