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Sarcomeric Proteins and Familial Hypertrophic Cardiomyopathy: Linking Mutations in Structural Proteins to Complex Cardiovascular Phenotypes

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Abstract

Hypertrophic Cardiomyopathy (HCM) is a relatively common primary cardiac disorder defined as the presence of a hypertrophied left ventricle in the absence of any other diagnosed etiology. HCM is the most common cause of sudden cardiac death in young people which often occurs without precedent symptoms. The overall clinical phenotype of patients with HCM is broad, ranging from a complete lack of cardiovascular symptoms to exertional dyspnea, chest pain, and sudden death, often due to arrhythmias. To date, 270 independent mutations in nine sarcomeric protein genes have been linked to Familial Hypertrophic Cardiomyopathy (FHC), thus the clinical variability is matched by significant genetic heterogeneity. While the final clinical phenotype in patients with FHC is a result of multiple factors including modifier genes, environmental influences and genotype, initial screening studies had suggested that individual gene mutations could be linked to specific prognoses. Given that the sarcomeric genes linked to FHC encode proteins with known functions, a vast array of biochemical, biophysical and physiologic experimental approaches have been applied to elucidate the molecular mechanisms that underlie the pathogenesis of this complex cardiovascular disorder. In this review, to illustrate the basic relationship between protein dysfunction and disease pathogenesis we focus on representative gene mutations from each of the major structural components of the cardiac sarcomere: the thick filament (β MyHC), the thin filament (cTnT and Tm) and associated proteins (MyBP-C). The results of these studies will lead to a better understanding of FHC and eventually identify targets for therapeutic intervention.

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Authors and Affiliations

  1. Department of Physiology and Biophysics and the Department of Medicine (Cardiology), Albert Einstein College of Medicine, Bronx, NY, 10461

    Jil C. Tardiff MD, PhD

  2. Albert Einstein College of Medicine, 1300 Morris Park Ave., Forchheimer Bldg, Room G-46, Bronx, NY, 10461

    Jil C. Tardiff MD, PhD

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  1. Jil C. Tardiff MD, PhD
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Correspondence to Jil C. Tardiff MD, PhD.

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Tardiff, J.C. Sarcomeric Proteins and Familial Hypertrophic Cardiomyopathy: Linking Mutations in Structural Proteins to Complex Cardiovascular Phenotypes. Heart Fail Rev 10, 237–248 (2005). https://doi.org/10.1007/s10741-005-5253-5

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  • DOI: https://doi.org/10.1007/s10741-005-5253-5

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