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Related Concept Videos

General Transcription Factors01:30

General Transcription Factors

7.7K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Transcription Factors02:16

Transcription Factors

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Transcription Factors02:16

Transcription Factors

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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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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Master Transcription Regulators02:23

Master Transcription Regulators

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
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Transcription factor ISL1 is essential for pacemaker development and function.

Xingqun Liang, Qingquan Zhang, Paola Cattaneo

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    Summary
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    The LIM homeodomain transcription factor ISL1 is essential for sinoatrial node (SAN) development and pacemaker cell function. ISL1 regulates numerous SAN-specific genes, offering potential for biological pacemaker therapies.

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    Area of Science:

    • Cardiovascular Biology
    • Developmental Biology
    • Molecular Genetics

    Background:

    • The sinoatrial node (SAN) is critical for maintaining a rhythmic heartbeat.
    • Understanding SAN development and function is key for treating sinus arrhythmias with therapies like biological pacemakers.

    Purpose of the Study:

    • To investigate the role of the LIM homeodomain transcription factor ISL1 in SAN development and function.
    • To identify downstream targets of ISL1 in pacemaker cells.

    Main Methods:

    • Analysis of Isl1 mutant mouse lines, including SAN-specific deletions.
    • RNA-sequencing (RNA-seq) of FACS-purified ISL1-deficient SAN cells.
    • Chromatin immunoprecipitation (ChIP) assays to identify direct ISL1 genomic binding sites.

    Main Results:

    • ISL1 is required for early embryonic viability and for the survival, proliferation, and function of SAN pacemaker cells.
    • ISL1 directly regulates approximately one-third of SAN-specific genes, including those encoding transcription factors and ion channels crucial for pacemaker function (e.g., L-type calcium channel subunits, Ank2, Tbx3).
    • ISL1 targets include genes implicated in human heart rhythm disorders.

    Conclusions:

    • ISL1 is a master regulator of SAN development and function.
    • ISL1, in combination with other SAN transcription factors, holds potential for generating functional pacemaker cells.
    • ISL1 mutations may be a cause of sick sinus syndrome.