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Cardiomyopathy III: Hypertrophic Cardiomyopathy

Cardiomyopathy III: Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...

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Updated: May 24, 2026

Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model

Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model

Published on: August 8, 2022

Aging Kit mutant mice develop cardiomyopathy.

Lei Ye¹, Eric Yang Zhang, Qiang Xiong

¹Leilihei Heart Institute, Department of Medicine, University of Minnesota Medical School, Minneapolis, Minnesota, United States of America.

|March 20, 2012

Summary

This summary is machine-generated.

c-Kit mutations impact cardiac progenitor cells, leading to cardiomyopathy in aging mice. While bone marrow cell defects contribute, cardiac-resident c-Kit(+) cells are the primary cause of heart dysfunction.

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Area of Science:

Cardiovascular Biology
Stem Cell Biology
Genetics

Background:

Progenitor cells expressing c-Kit tyrosine kinase are found in both bone marrow and myocardium.
c-Kit mutations can affect cell populations and tissue function.

Purpose of the Study:

To investigate the impact of c-Kit mutations on myocardial c-Kit(+) cell counts.
To assess the stability of left ventricular (LV) contractile function and structure during aging in mice with c-Kit mutations.

Main Methods:

Echocardiography was used to evaluate LV structure and function in Kit mutant (W/Wv, W41/W42) and wild-type mice at 4 and 12 months.
Analysis included LV mass, vascular density, and proliferating cell counts.
Bone marrow transplantation was performed to assess the contribution of bone marrow-derived progenitor cells.

Main Results:

At 12 months, W41/W42 mice showed decreased ejection fraction, fractional shortening, and increased LV mass compared to controls.
Both mutant groups exhibited reduced myocardial vascular density and c-Kit(+) cell numbers.
Bone marrow transplantation did not prevent cardiomyopathy in W41/W42 mice, suggesting resident cardiac cells are key.

Conclusions:

Decreased numbers and function of cardiac-resident c-Kit(+) progenitor cells likely underlie cardiomyopathy in W41/W42 mice.
While bone marrow progenitor cell defects may contribute, they are not the primary cause of this specific cardiomyopathy.