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Mutations in the muscle LIM protein and alpha-actinin-2 genes in dilated cardiomyopathy and endocardial fibroelastosis.

Abstract：

:Dilated cardiomyopathy (DCM) is a major cause of morbidity and mortality. Two genes have been identified for the X-linked forms (dystrophin and tafazzin), while mutations in multiple genes cause autosomal dominant DCM. Muscle LIM protein (MLP) is a member of the cysteine-rich protein (CRP) family and has been implicated in both myogenesis and sarcomere assembly. In the latter role, it binds zyxin and alpha-actinin, both of which are involved in actin organization. An MLP-deficient mouse has been described; these mice develop dilated cardiomyopathy and heart failure. Based upon these data, and the recent descriptions of mutations in MLP in patients with DCM or hypertrophic cardiomyopathy, we screened patients for mutations in the MLP and alpha-actinin-2 genes. We identified a patient with DCM and EFE, having a mutation in MLP with the residue lysine 69 substituted by arginine (K69R). This is within a highly conserved region adjacent to the first LIM domain involved in alpha-actinin binding. Analysis in cell culture systems demonstrated that the mutation abolishes the interaction between MLP and alpha-actinin-2 and the cellular localization of MLP was altered. In another individual with DCM, a W4R mutation was identified. However, this mutation did not segregate with disease in this family. In another patient with DCM, a Q9R mutation was identified in alpha-actinin-2. This mutation also disrupted the interaction with MLP and appeared to inhibit alpha-actinin function in cultured cells, in respect to the nuclear localization of actinin and the initiation of cellular differentiation.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Mohapatra B,Jimenez S,Lin JH,Bowles KR,Coveler KJ,Marx JG,Chrisco MA,Murphy RT,Lurie PR,Schwartz RJ,Elliott PM,Vatta M,McKenna W,Towbin JA,Bowles NE

doi

10.1016/s1096-7192(03)00142-2

subject

Has Abstract

pub_date

2003-09-01 00:00:00

pages

207-15

issue

1-2

eissn

1096-7192

issn

1096-7206

pii

S1096719203001422

journal_volume

80

pub_type

杂志文章

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