Fluorescence-based oligonucleotide ligation assay for analysis of cystic fibrosis transmembrane conductance regulator gene mutations

Human Mutation
F A EggerdingE S Winn-Deen

Abstract

Isolation of the gene for cystic fibrosis (CF), the cystic fibrosis transmembrane conductance regulator (CFTR), provided a basis for analyzing its molecular pathology and resulted in the identification of > 400 mutations associated with disease. Except for the delta F508 mutation, no other single mutation accounts for > 5% of CF chromosomes in most populations, and most mutation frequencies are < 1%. A strategy based on multiplex PCR followed by multiplex allele-specific oligonucleotide probe ligation was used to detect 30 mutations, distributed throughout ten exons and seven introns of the CFTR gene, that together account for > 96% of CF mutant chromosomes worldwide. Mutations were detected by competitive oligonucleotide probe ligation to detect normal and/or mutant genotypes in one reaction. Three probes (one common and two allelic probes) were needed for analysis of each mutation. Probes hybridized to target DNA were joined by a thermostable ligase if there were no mismatches at their junctions; temperature cycling resulted in a linear increase in product. Common probes were labeled with fluorochromes, and allelic probes each had different lengths. Ligation products were analyzed electrophoretically on a fluorescent DNA sequ...Continue Reading

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