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. 1991 Aug;49(2):311–319.

Nonradioactive assay for new microsatellite polymorphisms at the 5' end of the dystrophin gene, and estimation of intragenic recombination.

C Oudet 1, R Heilig 1, A Hanauer 1, J L Mandel 1
PMCID: PMC1683301  PMID: 1867193

Abstract

Indirect tracking of mutation by DNA polymorphisms is still essential for carrier and prenatal diagnosis of Duchenne/Becker muscular dystrophy, at least in the families where no deletion can be detected. Because of the relatively high level of intragenic recombination, informative and easily testable markers at both ends of the gene are necessary for efficient and accurate diagnosis. We report the characterization of two polymorphic microsatellite sequences (TG repeats) at the 5' end of the dystrophin gene, within 40 kb of the muscle-specific promoter. The most useful one (5' DYS MSA) has 10 alleles with a 57% heterozygosity and can be tested on small polyacrylamide gels in a nonradioactive PCR-based assay. Despite its large number of alleles, this microsatellite shows strong linkage disequilibrium with a two-allele polymorphism reported by Roberts et al., an indication of the stability of this type of sequences. We have used the new microsatellites at the 5' end, along with one we reported previously for the 3' end, to type the families in the CEPH (Centre d'Etude du Polymorphisme Humain) panel. While the number of informative families has increased by a factor of about two with respect to the study of Abbs et al., the estimates of the recombination fractions are in good agreement with this previous report, suggesting a 11% recombination across the gene (3% between the 5' end and the pERT87 region, 8% between pERT87 and the 3' end), which is about fivefold more than expected. However, these estimates still have wide confidence limits.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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