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. 1992 Mar 15;89(6):2331–2335. doi: 10.1073/pnas.89.6.2331

Point mutations in the dystrophin gene.

R G Roberts 1, M Bobrow 1, D R Bentley 1
PMCID: PMC48651  PMID: 1549596

Abstract

Defining the range of mutations in genes that cause human disease is essential to determine the mechanisms of genetic variation and the function of gene domains and to perform precise carrier and prenatal diagnosis. The mutations in one-third of Duchenne muscular dystrophy patients remain unknown as they do not involve gross rearrangements of the dystrophin gene. The size and complexity of the gene have prohibited the systematic definition of point mutations. We have developed a method for the identification of these mutations by nested amplification, chemical mismatch detection, and sequencing of reverse transcripts of trace amounts of dystrophin mRNA from peripheral blood lymphocytes. Analysis of the entire coding region (11 kilobases) in seven patients has resulted in detection of a sequence change in each case that is clearly sufficient to cause the disease. All mutations should cause premature translational termination, and the resulting phenotypes are thus equivalent to those caused by frameshifting deletions. The results support a particular functional importance for the C-terminal region of dystrophin. Application of this approach to mutation detection will extend direct carrier and prenatal diagnosis to virtually every affected family.

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