title: Does delta-sarcoglycan-associated autosomal-dominant cardiomyopathy exist?
abstract: 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.
authors.affiliation: Institute of Human Genetics, Newcastle University, International Center for Life, Newcastle upon Tyne, UK.
authors.forename: Ralf
authors.initials: R
authors.lastname: Bauer
authors.forename: Judith
authors.initials: J
authors.lastname: Hudson
authors.forename: Harald D
authors.initials: HD
authors.lastname: Müller
authors.forename: Clemens
authors.initials: C
authors.lastname: Sommer
authors.forename: Gabriele
authors.initials: G
authors.lastname: Dekomien
authors.forename: John
authors.initials: J
authors.lastname: Bourke
authors.forename: Daniel
authors.initials: D
authors.lastname: Routledge
authors.forename: Kate
authors.initials: K
authors.lastname: Bushby
authors.forename: Jörg
authors.initials: J
authors.lastname: Klepper
authors.forename: Volker
authors.initials: V
authors.lastname: Straub
mesh_terms: 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
chemical_list: D049031:Sarcoglycans