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Genetic Basis of Hypertrophic Cardiomyopathy in Cats
Arkadiusz Grzeczka1, Szymon Graczyk1, Robert Pasławski2
1Department for Basic and Preclinical Sciences, Institute of Veterinary Medicine, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland.
Insights
Hypertrophic cardiomyopathy (HCM) in cats is a common heart condition with genetic links. Research identifies specific gene mutations, like MYBPC3, as causes, though unknown factors also contribute.
Area of Science:
- Cardiology
- Genetics
- Veterinary Medicine
Background:
- Hypertrophic cardiomyopathy (HCM) is a prevalent cardiovascular disease in cats, affecting all breeds and ages.
- HCM is characterized by pathological cardiac changes, including myocardial hypertrophy and fibrosis, potentially leading to heart failure.
- Certain breeds like Ragdolls and Maine Coons are predisposed to early-onset HCM.
Purpose of the Study:
- To summarize current knowledge on feline hypertrophic cardiomyopathy (HCM).
- To review genetic variants associated with HCM in cats.
- To discuss cardiac tissue alterations resulting from these genetic factors.
Main Methods:
- Literature review of recent studies on feline HCM.
- Analysis of genetic mutations linked to HCM, focusing on sarcomeric proteins.
- Examination of pathological changes in cardiac tissue.
Main Results:
- Genetic mutations, particularly in the MYBPC3 gene (e.g., MYBPC3 [R818W], MYBPC3 [A31P]), are identified as pathogenic causes of HCM.
- Other gene variants (MYBPC3, TNNT2, ALMS1, MYH7) are also associated with the condition.
- HCM development can occur in cats without identified genetic mutations, indicating unknown genetic influences.
Conclusions:
- Genetic factors play a significant role in the etiology of feline HCM.
- Understanding these genetic underpinnings is crucial for diagnosis and potential therapeutic strategies.
- Further research is needed to elucidate all genetic contributors to HCM in cats.
Abstract:
Hypertrophic cardiomyopathy (HCM) is a common cardiovascular condition in cats, affecting yth males and females of all ages. Some breeds, such as Ragdolls and Maine Coons, can develop HCM at a young age. The disease has a wide range of progression and severity, characterized by various pathological changes in the heart, including arteritis, fibrous tissue deposition, and myocardial cell hypertrophy. Left ventricular hypertrophy, which can restrict blood flow, is a common feature of HCM. The disease may persist into old age and eventually lead to heart failure and increased diastolic pressure. The basis of HCM in cats is thought to be genetic, although the exact mechanisms are not fully understood. Mutations in sarcomeric proteins, in particular myosin-binding protein C (MYBPC3), have been identified in cats with HCM. Two specific mutations, MYBPC3 [R818W] and MYBPC3 [A31P], have been classified as 'pathogenic'. Other variants in genes such as MYBPC3, TNNT2, ALMS1, and MYH7 are also associated with HCM. However, there are cases where cats without known genetic mutations still develop HCM, suggesting the presence of unknown genetic factors contributing to the disease. This work aims to summarise the new knowledge of HCM in cats and the alterations in cardiac tissue as a result of genetic variants.
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