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Sporadic cardiac and skeletal myopathy caused by a de novo desmin mutation
Author(s) -
Park KyeYoon,
Dalakas Marinos C,
SeminoMora Christina,
Lee HeeSuk,
Litvak Svetlana,
Takeda Kazuyo,
Ferrans Victor J,
Goldfarb Lev G
Publication year - 2000
Publication title -
clinical genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.543
H-Index - 102
eISSN - 1399-0004
pISSN - 0009-9163
DOI - 10.1034/j.1399-0004.2000.570604.x
Subject(s) - desmin , myopathy , biology , genetics , mutation , microbiology and biotechnology , gene , immunohistochemistry , immunology , vimentin
Desmin myopathy is a familial or sporadic disorder characterized by intracytoplasmic accumulation of desmin in the muscle cells. We and others have previously identified desmin gene mutations in patients with familial myopathy, but close to 45% of the patients do not report previous family history of the disease. The present study was conducted to determine the cause of desmin myopathy in a sporadic patient presenting with symmetrical muscle weakness and atrophy combined with atrioventricular conduction block requiring a permanent pacemaker. A novel heterozygous R406W mutation in the desmin gene was identified by sequencing cDNA and genomic DNA. Expression of a construct containing the patient's mutant desmin cDNA in SW13 (vim‐) cells demonstrated a high pathogenic potential of the R406W mutation. This mutation was not found in the patient's father, mother or sister by sequencing and restriction analysis. Testing with five microsatellite markers and four intragenic single nucleotide polymorphisms excluded alternative paternity. Haplotype analysis indicates that the patient's father was germ‐line mosaic for the desmin mutation. We conclude that de novo mutations in the desmin gene may be the cause of sporadic forms of desmin‐related cardiac and skeletal myopathy.

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