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Related Concept Videos

Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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...
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair01:36

Mismatch Repair

Overview
Mutations01:39

Mutations

Overview
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

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Related Experiment Video

Updated: Jun 12, 2026

Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model
03:45

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

Published on: August 8, 2022

Mechanical and energetic consequences of HCM-causing mutations.

Cecilia Ferrantini1, Alexandra Belus, Nicoletta Piroddi

  • 1Department of Physiology and Center of Molecular Medicine (C.I.M.M.B.A.), University of Florence, Florence, Italy.

Journal of Cardiovascular Translational Research
|June 19, 2010
PubMed
Summary

Hypertrophic cardiomyopathy (HCM) mutations may impair cardiac myocyte energy, leading to heart dysfunction. This energy depletion hypothesis offers potential therapeutic targets for HCM disease modification.

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Area of Science:

  • Cardiovascular Genetics
  • Molecular Cardiology
  • Inherited Cardiac Diseases

Background:

  • Hypertrophic cardiomyopathy (HCM) is the first inherited heart disease linked to cardiac sarcomere gene mutations.
  • Early research suggested HCM mutations impair sarcomere mechanical function, leading to compensatory hypertrophy.
  • Recent studies propose HCM mutations enhance contractility and myofilament calcium sensitivity, while impairing cardiac myocyte energetics.

Purpose of the Study:

  • To explore the conflicting conclusions regarding the functional effects of HCM mutations.
  • To investigate the hypothesis that HCM mutations lead to cardiac myocyte energy depletion and altered calcium handling.
  • To discuss challenges in studying HCM at the human sarcomere level and identify therapeutic targets.

Main Methods:

  • Review of in vitro and mouse model studies on HCM mutations.
  • Analysis of functional characteristics of human cardiac sarcomeres in HCM.
  • Mechanically isolated skinned myocytes and myofibrils from human hearts.

Main Results:

  • Conflicting evidence exists regarding HCM mutation effects on sarcomere function.
  • Recent human myocyte studies support the energy depletion hypothesis.
  • HCM mutations may enhance contractility and calcium sensitivity while impairing energetics.

Conclusions:

  • The energy depletion hypothesis offers a unified explanation for HCM pathogenesis.
  • This hypothesis identifies potential therapeutic targets for disease-modifying therapies in HCM.
  • HCM may be particularly amenable to targeted interventions based on energy metabolism.