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RFLPs for Duchenne muscular dystrophy cDNA clones 9 and 10

RFLPs for Duchenne muscular dystrophy cDNA clones 9 and 10

American Journal of Human Genetics 46(6): 1090-1094

ISSN/ISBN: 0002-9297

PMID: 1971151

The complete 14-kb cDNA for the gene causing the X-linked recessive muscular dystrophy (MD) type Duchenne (DMD) and Becker (BMD) has recently been cloned and made available for deletion/duplication screening in patients. It detects 65 exon-containing nonpolymorphic HindIII fragments spread over a gene locus of about 2,000 kb. When the entire DMD cDNA is used, deletions/duplications can be found in about 65%-70% of affected patients, permitting direct carrier detection by densitometric scanning. But in cases where no deletion/duplication is detectable, RFLP analysis, specially favored within the gene, will be the method for carrier-status determination. Clones 9 and 10-1.2-kb and 0.7-kb fragments, respectively, of the 14-kb DMD cDNA--have been hybridized with human genomic DNA digested by nine different restriction enzymes. Five RFLPs, involving Asp700, PvuII, XbaI, and EcoRV sites, were detected, and Mendelian inheritance could be demonstrated. Since clones 9 and 10 are localized telomeric to the mutation-hot-spot region, their polymorphisms are thought to be very helpful as flanking markers for indirect carrier detection in families with a family history of DMD/BMD. Moreover, these RFLPs can be used for direct carrier detection or exclusion in families with patients showing a deletion/duplication in the region of p9 or p10.

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Accession: 018079705

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