[Detection of micro mutation in dystrophin gene of DMD female carrier].
We attempted to identify a mutation in dystrophin gene in a female patient who was suspected a Duchenne muscular dystrophy (DMD) carrier with muscle weakness of upper limbs and congestive heart failure. We examined the mutation hot spots in DMD gene, exon 3, 6, 8, 13, 17, 19, 43, 44, 45, 47, 48, 49, 50, 52, 60 by multiplex PCR which had been a diagnostic screening strategy, and detected an extra band in exon 43 product. We also detected an extra band in exon 43 products by SSCP analysis for detection of small mutations which could not be detected by multiplex PCR. As a result of sequencing a PCR product of an exon 43, we confirmed an allele having the insertion of a 2 base of AT in Intron42, which is described for the first time. Although we can not conclude that this insertion is responsible for DMD, but it may cause abnormal splicing. In carrier detection of DMD without genetic information of proband, it is difficult to detect mutations by multiplex PCR solely. Therefore, SSCP of PCR products are recommended to detect mutation in DMD carrier.
Department of Clinical Pathology, Showa University, School of Medicine, Shinagawa-ku, Tokyo 142-8666.
Akitoshi
A
Miyamoto
Kazumi
K
Taguchi
Soutaro
S
Hieda
Mitsuru
M
Kawamura
Kunihiko
K
Fukuchi
Kunihide
K
Gomi
D000368:Aged; D016189:Dystrophin / Q000235:genetics*; D005260:Female; D006579:Heterozygote; D006801:Humans; D020388:Muscular Dystrophy, Duchenne / Q000235:genetics*; D009154:Mutation; D016133:Polymerase Chain Reaction
D016189:Dystrophin