Molecular-genetic study of Duchenne and Becker muscular dystrophies: Deletion analysis of 45 Japanese patients and segregation analyses in their families with RFLPs based on the data from normal Japanese females

S. Sugino*, S. Fujishita, N. Kamimura, T. Matsumoto, M. C. Wapenaar, H. X. Deng, N. Shibuya, T. Miike, N. Niikawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

This study consisted of 1) molecular deletion analyses in patients with Duchenne muscular dystrophy (DMD) and Becker muscular dystrophy (BMD) using the entire cDNA for the DMD gene as hybridization probes, 2) RFLP analyses in a large number of Japanese normal women using 11 DMD-linked cloned DNAs as probes, and 3) segregation analyses with these RFLP data in 17 DMD families in which prenatal or carrier diagnosis was required. The deletion study showed that 18 (43%) of 42 male DMD patients had a deletion within the DMD gene, while no detectable deletion was found in 3 BMD patients. These deletions were preferentially observed at the 5' end of the DMD gene, while no deletion was found in the 3' portion of the gene. Of a total of 15 RFLPs detected with the 11 probes, one was a new RFLP (probe/enzyme: P20/MspI). In 6 RFLPs the allele frequencies in the Japanese were statistically different from those in the Caucasian. Based on the RFLP data combined with the result of the deletion study, an estimated diagnostic rate for prenatal diagnosis and/or carrier detection in the Japanese DMD families was 63%. The real diagnostic rate obtained from the prenatal and carrier diagnoses, which were practically performed in 17 families, corresponded to the estimation. A protocol useful for the diagnosis in Japanese DMD families is presented.

Original languageEnglish (US)
Pages (from-to)555-561
Number of pages7
JournalAmerican Journal of Medical Genetics
Volume34
Issue number4
DOIs
StatePublished - 1989

Keywords

  • DNA deletion
  • carrier detection
  • prenatal diagnosis
  • restriction fragment length polymorphisms

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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