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Mechanism of Cardiac Arrhythmias01:28

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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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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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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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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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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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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
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Updated: Dec 27, 2025

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Calmodulin Mutations Associated with Heart Arrhythmia: A Status Report.

Walter J Chazin1, Christopher N Johnson2,3

  • 1Departments of Biochemistry, Chemistry, and Center for Structural Biology, Vanderbilt University, Nashville, TN 37240, USA.

International Journal of Molecular Sciences
|February 26, 2020
PubMed
Summary

Mutations in calmodulin (CaM) genes, previously thought lethal, are linked to infant cardiac arrest. This review details CaM mutations affecting cardiac ion channels and arrhythmia.

Keywords:
CPVTCa2+ sensingCa2+ signalingLQTLTCCRyR2calmodulindisease associated mutationsion channel regulationion channels

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Area of Science:

  • Molecular Biology
  • Cardiology
  • Genetics

Background:

  • Calmodulin (CaM) is a highly conserved intracellular calcium-sensing protein crucial for ion channel regulation.
  • Previously, CaM mutations were presumed to be incompatible with life due to its essential role.
  • Recent discoveries identified de novo mutations in human CALM genes in infants with cardiac arrest.

Purpose of the Study:

  • To review known calmodulin mutations associated with cardiac arrhythmias.
  • To explore the biochemical and structural properties of these CaM mutations.
  • To understand the impact of these mutations on cardiac ion channel function.

Main Methods:

  • Literature review of reported calmodulin mutations.
  • Analysis of biochemical and structural data for identified mutations.
  • Correlation of mutation effects with cardiac ion channel function and pathophysiology.

Main Results:

  • Identification and characterization of multiple de novo CaM mutations linked to cardiac arrhythmias.
  • Evidence suggests these mutations impair CaM's ability to regulate cardiac ion channels.
  • Pathophysiological consequences include recurrent cardiac arrest in affected infants.

Conclusions:

  • Calmodulin mutations are a newly recognized cause of cardiac arrhythmias.
  • Understanding these mutations is critical for diagnosing and potentially treating related cardiac conditions.
  • Further research is needed to fully elucidate CaM's role in cardiac electrophysiology and disease.