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A mouse model of familial hypertrophic cardiomyopathy
A A Geisterfer-Lowrance1, M Christe, D A Conner
1Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA.
Insights
A new mouse model mimics human familial hypertrophic cardiomyopathy (FHC). This model reveals cardiac dysfunction precedes pathology, with disease progression over time, offering insights into FHC natural history.
Area of Science:
- Cardiovascular Research
- Genetics
- Animal Models
Background:
- Familial hypertrophic cardiomyopathy (FHC) is a genetic heart disease.
- Understanding FHC's natural history is crucial for developing effective treatments.
Purpose of the Study:
- To create and characterize a novel mouse model of FHC.
- To investigate the temporal relationship between cardiac dysfunction and histopathology in FHC.
Main Methods:
- Introduction of an Arg 403 --> Gln mutation into the alpha cardiac myosin heavy chain (MHC) gene in mice.
- Analysis of homozygous and heterozygous mice for survival, cardiac function, and histopathology.
Main Results:
- Homozygous mice (alpha MHC 403/403) had perinatal lethality.
- Heterozygous mice (alpha MHC 403/+) exhibited FHC-like cardiac pathology and dysfunction, with disease progression.
- Cardiac dysfunction was observed before significant histopathological changes, and males showed more severe disease than females.
Conclusions:
- The developed alpha MHC 403/+ mouse model accurately recapitulates key features of human FHC.
- This model provides a valuable tool for studying FHC pathogenesis and evaluating therapeutic strategies.
- Further research using this model can elucidate the long-term effects and exercise capacity limitations in FHC.
Abstract:
A mouse model of familial hypertrophic cardiomyopathy (FHC) was generated by the introduction of an Arg 403 --> Gln mutation into the alpha cardiac myosin heavy chain (MHC) gene. Homozygous alpha MHC 403/403 mice died 7 days after birth, and sedentary heterozygous alpha MHC 403/+ mice survived for 1 year. Cardiac histopathology and dysfunction in the alpha MHC 403/+ mice resembled human FHC. Cardiac dysfunction preceded histopathologic changes, and myocyte disarray, hypertrophy, and fibrosis increased with age. Young male alpha MHC 403/+ mice showed more evidence of disease than did their female counterparts. Preliminary results suggested that exercise capacity may have been compromised in the alpha MHC 403/+ mice. This mouse model may help to define the natural history of FHC.