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Related Concept Videos

Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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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...
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Biventricular Dysfunction in Knock-in Mice With Dsg2 Variants Specific for Japanese Arrhythmogenic Right Ventricular

Dimitar P Zankov1, Mend Amar Batbaatar1, Hirotsugu Tsuchimochi2

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Researchers created a knock-in arrhythmogenic right ventricular cardiomyopathy (ARVC) mouse model. This model mimics human ARVC, showing cardiac dysfunction and fibrosis, aiding future therapeutic development.

Keywords:
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Area of Science:

  • Cardiovascular Genetics
  • Inherited Cardiac Diseases
  • Molecular Cardiology

Background:

  • Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a genetic heart condition with poor outcomes and no cure.
  • It leads to sudden cardiac death and heart failure due to muscle loss.
  • This study focuses on common Japanese ARVC genetic variants.

Purpose of the Study:

  • To create knock-in (KI) mouse models for two frequent Japanese ARVC genetic variants (DSG2 p.R292C and p.D494A).
  • To characterize the cardiac phenotype in these KI mice.
  • To compare the mouse model's phenotype with human ARVC.

Main Methods:

  • CRISPR/Cas9 genome editing was used to introduce DSG2 variants (p.R297C and p.D499A) into mice.
  • Cardiac function, morphology, and electrophysiology were assessed via echocardiography, MRI, and telemetry.
  • Histological analysis examined cardiac tissue and cardiomyocytes, including fibrosis and apoptosis assays.

Main Results:

  • KI mice developed progressive biventricular cardiac dysfunction starting at 8 weeks.
  • Significant variability in phenotype expression was observed.
  • Sudden death occurred in p.R297C mice; both variants showed fibrosis and apoptosis; some homozygous p.R297C mice exhibited arrhythmias.

Conclusions:

  • A KI ARVC mouse model closely resembling human disease was successfully generated.
  • This model provides a valuable tool for understanding ARVC pathogenesis.
  • The model can facilitate the development of effective ARVC therapies.