ArticleCirculation. Cardiovascular genetics2015
In Vivo Analysis of Troponin C Knock-In (A8V) Mice: Evidence that TNNC1 Is a Hypertrophic Cardiomyopathy Susceptibility Gene.
Article in Circulation. Cardiovascular genetics, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 37 papers.
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Who cites it
37 citing papers in PubMed, 41 citations in OpenAlex.
- Diastolic contributors in cardiomyocytes of a cardiometabolic HFpEF-like mouse model.The Journal of general physiology · 2026Article
- Homozygous TNNC1-A8V Causes Impaired Diastolic Function and Restrictive Cardiomyopathy in Children and Mice.Circulation. Genomic and precision medicine · 2026Article
- Hypertrophic cardiomyopathy-linked Tnnc1 variants are associated with distinct myopathic changes in slow skeletal muscle of mice.Journal of muscle research and cell motility · 2026Article
- Cardiomyocyte Nuclear Pleomorphism in a Mouse Model of Inherited Hypertrophic Cardiomyopathy.Journal of cardiovascular development and disease · 2025Article
- Cardiac Troponin C E135A Variant Impairs Myofilament Response to PKA Phosphorylation and Is Associated With Autosomal Dominant Dilated Cardiomyopathy With Diastolic Dysfunction.Circulation. Genomic and precision medicine · 2025Article
- Experimental Models of Hypertrophic Cardiomyopathy: A Systematic Review.JACC. Basic to translational science · 2025Review
- Focus on cardiac troponin complex: From gene expression to cardiomyopathy.Genes & diseases · 2024Review
- Aging reveals a sex-dependent susceptibility of sarcospan-deficient mice to cardiometabolic disease.American journal of physiology. Heart and circulatory physiology · 2024Article
- Mouse Models of Cardiomyopathies Caused by Mutations in Troponin C.International journal of molecular sciences · 2023Review
- Sarcospan Deficiency Increases Oxidative Stress and Arrhythmias in Hearts after Acute Ischemia-Reperfusion Injury.International journal of molecular sciences · 2023Article
- Allele-specific silencing by RNAi of R92Q and R173W mutations in cardiac troponin T.Experimental biology and medicine (Maywood, N.J.) · 2022Article
- Shared Molecular Mechanisms of Hypertrophic Cardiomyopathy and Its Clinical Presentations: Automated Molecular Mechanisms Extraction Approach.Life (Basel, Switzerland) · 2021Article
- A comprehensive guide to genetic variants and post-translational modifications of cardiac troponin C.Journal of muscle research and cell motility · 2021Article
- The effect of variable troponin C mutation thin filament incorporation on cardiac muscle twitch contractions.Journal of molecular and cellular cardiology · 2021Article
- Anomalous structural dynamics of minimally frustrated residues in cardiac troponin C triggers hypertrophic cardiomyopathy.Chemical science · 2021Article
- Mutation location of HCM-causing troponin T mutations defines the degree of myofilament dysfunction in human cardiomyocytes.Journal of molecular and cellular cardiology · 2021Article
- Comparison and Analysis on the Existing Single-Herbal Strategies against Viral Myocarditis.Genetics research · 2021Article
- Cardiomyocyte nuclearity and ploidy: when is double trouble?Journal of muscle research and cell motility · 2020Article
- Sexual dimorphism in cardiac transcriptome associated with a troponin C murine model of hypertrophic cardiomyopathy.Physiological reports · 2020Article
- Stabilization of the cardiac sarcolemma by sarcospan rescues DMD-associated cardiomyopathy.JCI insight · 2019Article
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Authors and funding
15 authors at 3 institutions in 1 country.
Funding
Abstract
backgroundMutations in thin-filament proteins have been linked to hypertrophic cardiomyopathy, but it has never been demonstrated that variants identified in the TNNC1 (gene encoding troponin C) can evoke cardiac remodeling in vivo. The goal of this study was to determine whether TNNC1 can be categorized as an hypertrophic cardiomyopathy susceptibility gene, such that a mouse model can recapitulate the clinical presentation of the proband. METHODS AND
resultsThe TNNC1-A8V proband diagnosed with severe obstructive hypertrophic cardiomyopathy at 34 years of age exhibited mild-to-moderate thickening in left and right ventricular walls, decreased left ventricular dimensions, left atrial enlargement, and hyperdynamic left ventricular systolic function. Genetically engineered knock-in (KI) mice containing the A8V mutation (heterozygote=KI-TnC-A8V(+/-); homozygote=KI-TnC-A8V(+/+)) were characterized by echocardiography and pressure-volume studies. Three-month-old KI-TnC-A8V(+/+) mice displayed decreased ventricular dimensions, mild diastolic dysfunction, and enhanced systolic function, whereas KI-TnC-A8V(+/-) mice displayed cardiac restriction at 14 months of age. KI hearts exhibited atrial enlargement, papillary muscle hypertrophy, and fibrosis. Liquid chromatography-mass spectroscopy was used to determine incorporation of mutant cardiac troponin C (≈ 21%) into the KI-TnC-A8V(+/-) cardiac myofilament. Reduced diastolic sarcomeric length, increased shortening, and prolonged Ca(2+) and contractile transients were recorded in intact KI-TnC-A8V(+/-) and KI-TnC-A8V(+/+) cardiomyocytes. Ca(2+) sensitivity of contraction in skinned fibers increased with mutant gene dose: KI-TnC-A8V(+/+)>KI-TnC-A8V(+/-)>wild-type, whereas KI-TnC-A8V(+/+) relaxed more slowly on flash photolysis of diazo-2.
conclusionsThe TNNC1-A8V mutant increases the Ca(2+)-binding affinity of the thin filament and elicits changes in Ca(2+) homeostasis and cellular remodeling, which leads to diastolic dysfunction. These in vivo alterations further implicate the role of TNNC1 mutations in the development of cardiomyopathy.
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