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Cardiomyopathy II: Dilated Cardiomyopathy01:30

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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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Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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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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Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

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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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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model
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Reevaluating the Genetic Contribution of Monogenic Dilated Cardiomyopathy.

Francesco Mazzarotto1,2,3,4, Upasana Tayal1,2, Rachel J Buchan1,2

  • 1National Heart and Lung Institute (F.M., U.T., R.J.B., W.M., A.W., N.W., R.G., E.M., T.J.W.D., L.E.F., M.A., P.I.T., E.E., A.J.B., A.M.R., P.J.R.B., S.K.P., S.A.C., J.S.W.), Imperial College London, United Kingdom.

Circulation
|January 28, 2020
PubMed
Summary
This summary is machine-generated.

This study identifies 12 key genes associated with dilated cardiomyopathy (DCM), improving diagnostic accuracy for this genetic heart condition. These findings enhance the clinical interpretation of rare variants in DCM genetic testing.

Keywords:
ExACMendelian geneticsdilated cardiomyopathygenetic testingrare variant association testing

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Area of Science:

  • Genetics
  • Cardiology
  • Genomic Medicine

Background:

  • Dilated cardiomyopathy (DCM) is a complex genetic heart condition with numerous suspected genes.
  • Previous gene discovery often overlooked population variation, impacting diagnostic reliability.

Purpose of the Study:

  • To identify clinically interpretable genes robustly associated with dominant monogenic DCM.
  • To assess the frequency of rare variants in commonly tested DCM genes.

Main Methods:

  • Sequenced 56 putative DCM genes in 2538 DCM patients and 912 healthy controls.
  • Utilized a TruSight Cardio sequencing panel and aggregated data for meta-analysis.

Main Results:

  • Robust association found for variants in TTN and DSP genes.
  • 10 additional genes (MYH7, LMNA, BAG3, TNNT2, TNNC1, PLN, ACTC1, NEXN, TPM1, VCL) showed enrichment in specific DCM subsets.
  • These 12 genes explained 17-26% of DCM cases, with TPM1 and VCL potentially linked to early-onset forms.

Conclusions:

  • Identified 12 genes with high diagnostic value for DCM.
  • Findings will improve diagnostic testing interpretability and reduce inconclusive results.
  • Further evaluation of other genes is needed for their role in Mendelian DCM.