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Related Concept Videos

G-Protein Gated Ion Channels01:21

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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Conduction System of the Heart01:20

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
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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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Catenins01:23

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Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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Updated: Apr 18, 2026

Light-sheet Fluorescence Microscopy to Capture 4-Dimensional Images of the Effects of Modulating Shear Stress on the Developing Zebrafish Heart
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GATA-Binding Factor 6 Contributes to Atrioventricular Node Development and Function.

Fang Liu1, Min Min Lu1, Neil N Patel1

  • 1From the Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia (F.L., M.M.L., N.N.P., K.J.S., T.W.); and Department of Physiology, Section of Clinical Cardiac Electrophysiology & Cardiovascular Research Center, Temple University School of Medicine, Philadelphia, PA (V.V.P.).

Circulation. Cardiovascular Genetics
|January 24, 2015
PubMed
Summary
This summary is machine-generated.

GATA6 is crucial for cardiac conduction system development, particularly the atrioventricular node. Its deletion impairs conduction and reduces cardiomyocyte cell-cycle exit, impacting heart function.

Keywords:
GATA6 transcription factoratrioventricular nodecardiac electrophysiology

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Molecular Cardiology

Background:

  • Transcription factors regulate cardiac conduction system (CCS) development and function.
  • GATA-binding factor 6 (GATA6) is vital for cardiovascular patterning but its role in embryonic CCS is unknown.

Purpose of the Study:

  • To investigate the role of GATA6 in the development and function of the embryonic cardiac conduction system.
  • To elucidate GATA6's specific contributions to atrioventricular node and bundle development.

Main Methods:

  • Utilized myocardial-specific deletion of the carboxyl zinc-finger of Gata6 in mice.
  • Assessed CCS component expression (HCN4, Cx40) and electrophysiological function.
  • Analyzed cardiomyocyte cell-cycle exit and gene expression (ID2, NCX1).

Main Results:

  • Gata6 is abundant in the proximal CCS during midgestation.
  • Deletion of Gata6 carboxyl zinc-finger reduced HCN4 staining in the atrioventricular node and altered atrioventricular conduction.
  • GATA6 transactivates ID2 and NCX1, and its deletion impairs cardiomyocyte cell-cycle exit in the atrioventricular bundle.

Conclusions:

  • GATA6 is essential for atrioventricular node development and postnatal function.
  • GATA6 promotes cardiomyocyte cell-cycle exit, directing them towards a conduction system lineage.