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Mutation Glu82Lys in lamin A/C gene is associated with cardiomyopathy and conduction defect
Hu Wang1, Jizheng Wang, Weiyue Zheng
1Sino-German Laboratory for Molecular Medicine, Fuwai Cardiovascular Hospital and Cardiovascular Institute, Peking Union Medical College and Chinese Academy of Medical Sciences, 167 Beilishi Road, 100037 Beijing, China.
Insights
Genetic mutations in the lamin A/C gene are linked to dilated cardiomyopathy. A specific Glu82Lys mutation disrupts protein localization and nuclear structure, contributing to heart muscle disease.
Area of Science:
- Genetics
- Cardiology
- Cell Biology
Background:
- Dilated cardiomyopathy (DCM) is a heart muscle disease affecting systolic function and ventricular size.
- Mutations in the lamin A/C gene are implicated in the development of DCM.
- The precise pathogenic mechanisms underlying lamin A/C gene defects in DCM remain unclear.
Purpose of the Study:
- To investigate genetic mutations in a Chinese family with dilated cardiomyopathy.
- To elucidate the pathogenic mechanism of a novel lamin A/C gene mutation (Glu82Lys) in DCM.
Main Methods:
- Genetic screening of a 50-member Chinese family for lamin A/C gene mutations.
- In vitro transfection of HEK293 cells with wild-type and Glu82Lys mutated lamin A/C.
- Analysis of protein localization, nuclear membrane structure, and heterochromatin distribution using transmission electron microscopy.
Main Results:
- A heterozygous Glu82Lys substitution in the lamin A/C gene was identified in eight family members, three with diagnosed DCM.
- Mutated lamin A/C protein exhibited abnormal localization within transfected cells.
- Aberrant distribution of emerin, disruption of nuclear membrane structure, and heterochromatin aggregation were observed in cells with the mutated lamin A/C protein.
Conclusions:
- The identified Glu82Lys mutation in the lamin A/C gene is associated with dilated cardiomyopathy in this Chinese family.
- The mutation impairs lamin A/C protein localization, leading to nuclear structural abnormalities and potentially contributing to DCM pathogenesis.
- Further research is warranted to fully understand the molecular mechanisms linking lamin A/C mutations to heart muscle disease.
Abstract:
Dilated cardiomyopathy is a form of heart muscle disease characterized by impaired systolic function and ventricular dilation. The mutations in lamin A/C gene have been linked to dilated cardiomyopathy. We screened genetic mutations in a large Chinese family of 50 members including members with dilated cardiomyopathy and found a Glu82Lys substitution mutation in the rod domain of the lamin A/C protein in eight family members, three of them have been diagnosed as dilated cardiomyopathy, one presented with heart dilation. The pathogenic mechanism of lamin A/C gene defect is poorly understood. Glu82Lys mutated lamin A/C and wild type protein was transfected into HEK293 cells. The mutated protein was not properly localized at the inner nuclear membrane and the emerin protein, which interacts with lamin A/C, was also aberrantly distributed. The nuclear membrane structure was disrupted and heterochromatin was aggregated aberrantly in the nucleus of the HEK293 cells stably transfected with mutated lamin A/C gene as determined by transmission electron microscopy.
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