Novel mutation in splicing donor of dystrophin gene first exon in a patient with dilated cardiomyopathy but no clinical signs of skeletal myopathy.
One cause of X-linked dilated cardiomyopathies is mutation of the dystrophin gene. We report the case of a young boy who suffered from dilated cardiomyopathy caused only by dystrophin-deficient cardiac muscle, but who did not present with any clinical signs of skeletal myopathy. Sequence analysis of the patient's dystrophin gene revealed the presence of a novel single point mutation at the first exon-intron boundary, inactivating the 5' splice site consensus sequence of the first intron. The lack of muscle weakness observed clinically can be explained by expression of the brain and Purkinje dystrophin isoforms in skeletal muscle.
Kimura
Shigemi
S
Department of Child Development, Kumamoto University School of Medicine, 1-1-1 Honjou, Kumamoto 860-0811, Japan. kimusige@kaiju.medic.kumamoto-u.ac.jp
Ikezawa
Makoto
M
Ozasa
Shiro
S
Ito
Kaori
K
Ueno
Hiroe
H
Yoshioka
Kowashi
K
Ijiri
Saki
S
Nomura
Keiko
K
Nakamura
Kyoko
K
Matuskura
Makoto
M
Miike
Teruhisa
T
D000293:Adolescent; D002311:Cardiomyopathy, Dilated / Q000235:genetics*; D016384:Consensus Sequence / Q000235:genetics*; D016189:Dystrophin / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000378:metabolism; D009206:Myocardium / Q000378:metabolism / Q000473:pathology; D017354:Point Mutation / Q000235:genetics*; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D022821:RNA Splice Sites / Q000235:genetics*
D016189:Dystrophin; D020033:Protein Isoforms; D022821:RNA Splice Sites