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Related Concept Videos

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 I: Introduction and Classification01:25

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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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Calmodulin-dependent Signaling01:16

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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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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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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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Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
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Related Experiment Video

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Calmodulin mutations causing catecholaminergic polymorphic ventricular tachycardia confer opposing functional and

Mads T Søndergaard1, Anders B Sorensen, Louise L Skov

  • 1Department of Chemistry and Bioscience, Aalborg University, Denmark.

The FEBS Journal
|January 6, 2015
PubMed
Summary

Calmodulin (CaM) mutations linked to CPVT show distinct effects on heart function. Zebrafish models reveal these CaM variants specifically impact cardiac activity, not overall development.

Keywords:
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Area of Science:

  • Cardiology
  • Molecular Biology
  • Genetics

Background:

  • Calmodulin (CaM) is crucial for intracellular calcium (Ca2+) signaling in cardiomyocytes, regulating cardiac contraction.
  • Mutations N53I and N97S in CaM are linked to catecholaminergic polymorphic ventricular tachycardia (CPVT), a serious heart rhythm disorder.
  • The tissue-specific effects of CaM mutations, despite CaM's ubiquitous presence, remain poorly understood.

Purpose of the Study:

  • To investigate the physiological effects of CaM mutations associated with CPVT using a zebrafish model.
  • To compare the biophysical and functional impacts of the N53I and N97S CaM mutations on CaM's properties.
  • To elucidate the distinct molecular mechanisms underlying CPVT caused by different CaM mutations.

Main Methods:

  • Injected zebrafish embryos with wild-type and mutant CaM mRNA (N53I, N97S).
  • Assessed cardiac function, specifically heart rate under beta-adrenergic stimulation.
  • Performed biophysical and functional analyses of CaM mutants to evaluate Ca2+ binding, structure, and stability.

Main Results:

  • Zebrafish embryos injected with CPVT CaM mRNA exhibited increased heart rate under beta-adrenergic stimulation, unlike controls.
  • The N53I and N97S mutations demonstrated opposing effects on CaM's C-lobe Ca2+ binding affinity and kinetics.
  • Both mutations induced differential changes in CaM structure and stability, with minor N-lobe binding alterations.

Conclusions:

  • The study confirms a conserved, dominant, cardiac-specific effect of CaM CPVT mutations in zebrafish, mirroring human phenotypes.
  • Different CaM mutations (N53I and N97S) appear to cause CPVT through distinct molecular mechanisms.
  • Cardiac contraction is identified as the physiological process most sensitive to CaM integrity, highlighting its critical role in heart function.