Does delta-sarcoglycan-associated autosomal-dominant cardiomyopathy exist?
In this study we clinically and genetically characterize a consanguineous family with a homozygous novel missense mutation in the delta-sarcoglycan gene and a second delta-sarcoglycan mutation that has previously been reported to cause severe autosomal-dominant dilated cardiomyopathy. We identified a novel missense mutation in exon 6 (p.A131P) of the delta-sarcoglycan gene, which in a homozygous state leads to the clinical picture of a limb girdle muscular dystrophy. In four heterozygous carriers for the mutation, aged 3-64 years, a second sequence variant in exon 6 (p.S151A) of the delta-sarcoglycan gene was detected on the other allele. This second missense change had previously been reported to be responsible for fatal autosomal-dominant dilated cardiomyopathy at young age. Comprehensive clinical and cardiac investigation in all of the compound heterozygous family members revealed no signs of cardiomyopathy or limb girdle muscular dystrophy. Our findings demonstrate that, even in the presence of a second disease-causing mutation, the p.S151A mutation in the delta-sarcoglycan gene does not result in cardiomyopathy. This finding questions the pathological relevance of this sequence variant for causing familial autosomal-dominant dilated cardiomyopathy and thereby the role of the delta-sarcoglycan gene in general as a disease-causing gene for autosomal-dominant dilated cardiomyopathy.
Bauer
Ralf
R
Institute of Human Genetics, Newcastle University, International Center for Life, Newcastle upon Tyne, UK.
Hudson
Judith
J
Müller
Harald D
HD
Sommer
Clemens
C
Dekomien
Gabriele
G
Bourke
John
J
Routledge
Daniel
D
Bushby
Kate
K
Klepper
Jörg
J
Straub
Volker
V
D000293:Adolescent; D000328:Adult; D001706:Biopsy; D002311:Cardiomyopathy, Dilated / Q000175:diagnosis / Q000235:genetics* / Q000503:physiopathology; D002648:Child; D002675:Child, Preschool; D003241:Consanguinity; D004252:DNA Mutational Analysis; D004452:Echocardiography; D004562:Electrocardiography; D005192:Family Health; D005260:Female; D005799:Genes, Dominant; D006801:Humans; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000473:pathology; D020125:Mutation, Missense; D009206:Myocardium / Q000473:pathology; D010375:Pedigree; D049031:Sarcoglycans / Q000235:genetics*; D055815:Young Adult
D049031:Sarcoglycans