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Related Concept Videos

Canonical Wnt Signaling Pathway02:54

Canonical Wnt Signaling Pathway

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The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which...
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Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
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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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Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
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The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...
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Fruits form from a mature flower ovary. As seeds develop from the ovules contained within, the ovary wall undergoes a series of complex changes to form fruit. In some fruits, such as soybeans, the ovary wall dries; in other fruits, such as grapes, it remains fleshy. In some cases, organs other than the ovary contribute to fruit formation; such fruits are called accessory fruits.
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Related Experiment Video

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The Diabetes Gene and Wnt Pathway Effector TCF7L2 Regulates Adipocyte Development and Function.

Xi Chen1, Iriscilla Ayala1, Chris Shannon1

  • 1Diabetes Division, University of Texas Health Science Center, San Antonio, TX.

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|January 11, 2018
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Transcription factor 7-like 2 (TCF7L2) is crucial for adipocyte function and glucose regulation. Its deficiency causes glucose intolerance and insulin resistance, linking TCF7L2 to type 2 diabetes mellitus pathophysiology.

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Area of Science:

  • Molecular Biology
  • Endocrinology
  • Metabolic Disease Research

Background:

  • Transcription factor 7-like 2 (TCF7L2) is strongly associated with type 2 diabetes mellitus (T2DM).
  • TCF7L2 is a key component of the Wnt/β-catenin pathway, influencing adipogenesis.
  • Its specific role in adipocyte development and function requires further elucidation.

Purpose of the Study:

  • To investigate the role of TCF7L2 in adipocyte differentiation and function.
  • To determine the in vivo consequences of TCF7L2 inactivation in mature adipocytes.
  • To explore the clinical relevance of TCF7L2 expression in human metabolic health.

Main Methods:

  • In vitro studies using 3T3-L1 cells and primary adipocyte stem cells.
  • In vivo inactivation of TCF7L2's DNA binding domain in mature adipocytes.
  • Assessment of glucose tolerance, insulin resistance, adipose tissue characteristics, and inflammation.
  • Analysis of TCF7L2 mRNA expression in human subjects with impaired glucose tolerance.

Main Results:

  • TCF7L2 protein levels increase during adipogenesis and are required for Wnt signaling regulation.
  • Inactivation of TCF7L2 leads to glucose intolerance, hepatic insulin resistance, increased subcutaneous fat, adipocyte hypertrophy, and inflammation.
  • Reduced TCF7L2 mRNA expression correlates with impaired glucose tolerance and adipocyte insulin resistance in humans.

Conclusions:

  • TCF7L2 plays essential roles in adipose tissue development and function.
  • Dysregulation of TCF7L2 contributes to the pathophysiology of type 2 diabetes mellitus.
  • TCF7L2 is a potential therapeutic target for metabolic disorders.