1. Ataxia-Telangiectasia: Identification and Detection of Founder-Effect Mutations in the ATM Gene in Ethnic Populations
- Author
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Sergi Castellví-Bel, Sharon N. Teraoka, Eva Bernatowska-Matuszkiewicz, Anne Lise Børresen-Dale, Helen H. Chun, Milhan Telatar, Anne K. Junker, Richard A. Gatti, Teresa Liang, Patrick Concannon, Nitin Udar, Zhijun Wang, Oscar Porras, Luciana Chessa, and Mitsunori Watanabe
- Subjects
Male ,Heterozygote ,DNA, Complementary ,Protein truncation mutation screening ,ATM gene ,DNA Mutational Analysis ,Founder mutations ,Cell Cycle Proteins ,Ataxia Telangiectasia Mutated Proteins ,Protein Serine-Threonine Kinases ,Biology ,medicine.disease_cause ,Loss of heterozygosity ,Ataxia Telangiectasia ,Ethnicity ,medicine ,Genetics ,Humans ,Genetics(clinical) ,Allele ,Gene ,Genetics (clinical) ,Mutation ,Mutation detection, rapid assays ,Tumor Suppressor Proteins ,Racial Groups ,Haplotype ,Proteins ,medicine.disease ,DNA-Binding Proteins ,genomic DNA ,Haplotypes ,Ataxia-telangiectasia ,RNA ,Female ,Ethnic populations ,Ataxia-telangiectasia mutations ,Research Article ,Founder effect - Abstract
SummaryTo facilitate the evaluation of ATM heterozygotes for susceptibility to other diseases, such as breast cancer, we have attempted to define the most common mutations and their frequencies in ataxia-telangiectasia (A-T) homozygotes from 10 ethnic populations. Both genomic mutations and their effects on cDNA were characterized. Protein-truncation testing of the entire ATM cDNA detected 92 (66%) truncating mutations in 140 mutant alleles screened. The haplotyping of patients with identical mutations indicates that almost all of these represent common ancestry and that very few spontaneously recurring ATM mutations exist. Assays requiring minimal amounts of genomic DNA were designed to allow rapid screening for common ethnic mutations. These rapid assays detected mutations in 76% of Costa Rican patients (3), 50% of Norwegian patients (1), 25% of Polish patients (4), and 14% of Italian patients (1), as well as in patients of Amish/Mennonite and Irish English backgrounds. Additional mutations were observed in Japanese, Utah Mormon, and African American patients. These assays should facilitate screening for A-T heterozygotes in the populations studied.
- Published
- 1998
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