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. 1989 Apr;44(4):496–503.

Gene deletions in X-linked muscular dystrophy

Mikael Lindlöf, Anne Kiuru, Helena Kääriäinen, Hannu Kalimo, Heikki Lang, Helena Pihko, Juhani Rapola, Hannu Somer, Mirja Somer, Marja-Liisa Savontaus, Albert de la Chapelle
PMCID: PMC1715571  PMID: 2929594

Abstract

Of the approximately 170 families with X-linked muscular dystrophy of the Duchenne (DMD) and Becker (BMD) type in Finland, we have studied 90 unrelated patients for intragenic deletions by using the cDNA probes described by Koenig et al. Forty-five patients (50%) had molecular deletions of one or several of the 65 exon-containing HindIII fragments. In six deletion cases junction fragments of altered size were seen. Thirty-eight (84%) of the 45 deletions were detected using only two (1–2a and 8) of the six cDNA subclones. Using a wheelchair age of 12 years to distinguish between DMD and BMD, we found that the proportions of patients with deletions were similar. Deletions were equally common in familial and sporadic disease. BMD was more commonly caused by deletions in the 5' end of the gene than was DMD. In at least three instances deletions of similar type resulted in diseases of similar severity. Of 14 patients with mental retardation seven had deletions; six of these comprised exons contained in probe 8. We conclude that cDNA hybridization studies provide a powerful diagnostic tool in DMD and BMD and that they promise to produce better insights into molecular-clinical correlations.

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Selected References

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