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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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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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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Exploring digenic inheritance in arrhythmogenic cardiomyopathy.

Eva König1, Claudia Béu Volpato1, Benedetta Maria Motta1

  • 1Institute for Biomedicine, Eurac Research, Affiliated Institute of the University of Lübeck, Bolzano, Italy.

BMC Medical Genetics
|December 10, 2017
PubMed
Summary

This study investigated digenic inheritance in arrhythmogenic cardiomyopathy (ACM), identifying potential second genes that interact with PKP2 mutations. These findings may explain ACM

Keywords:
ACMArrhythmogenic cardiomyopathyDigenic inheritanceExome sequencingPKP2

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Area of Science:

  • Cardiovascular Genetics
  • Molecular Cardiology
  • Genetic Epidemiology

Background:

  • Arrhythmogenic cardiomyopathy (ACM) is an inherited disorder causing fibro-fatty tissue replacement in the heart muscle, leading to arrhythmias and sudden cardiac death.
  • Despite being considered monogenic, ACM exhibits low penetrance, suggesting additional genetic or environmental factors influence disease development.

Purpose of the Study:

  • To investigate digenic inheritance patterns in ACM families with known PKP2 mutations.
  • To identify candidate genes that, in conjunction with PKP2 mutations, contribute to ACM pathogenesis.

Main Methods:

  • Whole exome sequencing was employed in two ACM families.
  • Candidate genes were identified by analyzing variants co-segregating with PKP2 mutations in affected versus healthy individuals.
  • Computational prioritization focused on known ACM genes and those functionally related to PKP2.

Main Results:

  • Four candidate genes (DAG1, DAB2IP, CTBP2, TCF25) were identified in family 1.
  • Eleven candidate genes were found in family 2, with TTN being particularly promising due to rare deleterious variants in an affected individual.
  • One TTN variant was located in the protein's serine kinase domain.

Conclusions:

  • This study reports potential digenic contributors to ACM pathogenesis alongside PKP2 mutations.
  • Further validation in larger cohorts is necessary to confirm the clinical utility of this digenic inheritance model for ACM.