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Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model
Published on: August 8, 2022
Hypertrophic Cardiomyopathy: Diverse Pathophysiology Revealed by Genetic Research, Toward Future Therapy
1Department of Physiology, Tokai University School of Medicine, Kanagawa, Japan.
Insights
Hypertrophic cardiomyopathy (HCM) is a genetic heart condition causing heart failure and sudden death. Research shows mutations beyond sarcomere genes contribute to HCM, necessitating further study for new therapies.
Area of Science:
- Cardiology
- Genetics
- Molecular Biology
Background:
- Hypertrophic cardiomyopathy (HCM) is a prevalent genetic heart disease affecting 0.2% of the population, leading to heart failure and sudden cardiac death.
- While sarcomere protein gene mutations were initially identified as primary causes, less than half of HCM patients harbor these mutations.
- HCM pathophysiology involves a broader spectrum of genetic mutations affecting various cardiac cellular components.
Purpose of the Study:
- To review the genetic basis of hypertrophic cardiomyopathy (HCM).
- To highlight the expanding understanding of HCM genetics beyond sarcomere mutations.
- To emphasize the need for further research into the complex genetic contributions to HCM.
Main Methods:
- Review of existing literature on hypertrophic cardiomyopathy genetics.
- Analysis of next-generation sequencing data identifying multiple gene mutations in HCM patients.
- Examination of findings from animal models elucidating mutation effects on myocardial function.
Main Results:
- HCM is linked to mutations in genes encoding sarcomere proteins (e.g., myosin heavy chain, myosin-binding protein C, troponin).
- A significant proportion of HCM cases involve mutations in non-sarcomeric cardiac proteins (Z disc, sarcoplasmic reticulum, plasma membrane, nucleus, mitochondria).
- Next-generation sequencing frequently identifies multiple causative gene mutations in individual HCM patients.
Conclusions:
- The genetic landscape of HCM is more complex than initially thought, involving diverse cellular pathways.
- Understanding the interplay of multiple genetic mutations is crucial for deciphering HCM pathophysiology.
- Further research and clinical trials are essential for developing targeted therapies for HCM based on its complex genetic underpinnings.
Abstract:
Hypertrophic cardiomyopathy (HCM) is an intractable disease that causes heart failure mainly due to unexplained severe cardiac hypertrophy and diastolic dysfunction. HCM, which occurs in 0.2% of the general population, is the most common cause of sudden cardiac death in young people. HCM has been studied extensively using molecular genetic approaches. Genes encoding cardiac β-myosin heavy chain, cardiac myosin-binding protein C, and troponin complex, which were originally identified as causative genes, were subsequently reported to be frequently implicated in HCM. Indeed, HCM has been considered a disease of sarcomere gene mutations. However, fewer than half of patients with HCM have mutations in sarcomere genes. The others have been documented to have mutations in cardiac proteins in various other locations, including the Z disc, sarcoplasmic reticulum, plasma membrane, nucleus, and mitochondria. Next-generation sequencing makes it possible to detect mutations at high throughput, and it has become increasingly common to identify multiple cardiomyopathy-causing gene mutations in a single HCM patient. Elucidating how mutations in different genes contribute to the disease pathophysiology will be a challenge. In studies using animal models, sarcomere mutations generally tend to increase myocardial Ca2+ sensitivity, and some mutations increase the activity of myosin ATPase. Clinical trials of drugs to treat HCM are ongoing, and further new therapies based on pathophysiological analyses of the causative genes are eagerly anticipated.
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