Molecular analysis of Duchenne and Becker muscular dystrophy

Bioessays 7 (2):57-62 (1987)
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Abstract

Duchenne muscular dystrophy (DMD) is a progressive and lethal neuromuscular disorder caused by a defective gene on the X chromosome. There is no effective treatment and the biochemical defect is yet unknown. Mapping of the DMD locus to band Xp21 in the short arm of the X chromosome has given rise to strategies to clone the gene from its known location in the chromosome. Two cloning strategies have led to the isolation of a gene that is the largest of any yet described. Portions of the gene are deleted in about 8% of affected males, and rare translocations that disrupt the gene cause the disease in females. The isolation of expressed sequences from the DMD locus will undoubtedly lead to isolation of the gene product and ultimately to an understanding of the basic defect. In the meantime, DNA probes from the DMD locus provide a new and accurate approach for carrier identification and prenatal diagnosis of this dreaded disease.

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