Summary
DNA from 80 Duchenne (DMD) and 15 Becker (BMD) index patients was analyzed with 12 genomic probes and the total cDNA. Deletions were detected in 24 DMD (30%) and 10 BMD patients (67%) by genomic probes alone, mostly p20, pXJ, and/or pERT87. All deletions were confirmed by cDNA probes, and an additional 29 DMD deletions were detected, resulting in a total of 63/95 deletions (66%). The majority of the deletions are localized between kb 6.7 and 9.7 of the cDNA; a smaller group, between kb 0.5 and 3.5. Of the deletions, 90% are detected by the three cDNA probes 1–2a, 7, and 8. This can be applied to strategies for carrier detection and prenatal diagnosis. The order of 13 exon-containing HindIII fragments in the region between probes 7 and 9–10, where most of the deletions are found, could be defined. The deletion patterns in DMD and BMD patients are different and well in accordance with the “reading frame theory” of Monaco and coworkers. Thus our findings indicate that a DMD or BMD phenotype may be predicted according to the breakpoint position and the number of deleted exons.
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Liechti-Gallati, S., Koenig, M., Kunkel, L.M. et al. Molecular deletion patterns in Duchenne and Becker type muscular dystrophy. Hum Genet 81, 343–348 (1989). https://doi.org/10.1007/BF00283688
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DOI: https://doi.org/10.1007/BF00283688