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Related Concept Videos

Notch Signaling Pathway03:14

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The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
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Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
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The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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A somatic proteoglycan controls Notch-directed germ cell fate.

Sandeep Gopal1, Aqilah Amran2, Andre Elton2

  • 1Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria, 3800, Australia. sandeep.gopal@monash.edu.

Nature Communications
|November 19, 2021
PubMed
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Somatic syndecan-1 (SDN-1) signaling regulates germ cell fate by controlling Notch receptor GLP-1 expression in C. elegans. This pathway involves a calcium channel and transcription factor APTF-2, linking somatic signals to germline development.

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Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Genetics

Background:

  • Somatic-germline communication is crucial for germ cell development.
  • Notch receptors are key regulators of germ cell fate.
  • The precise mechanisms by which somatic signals influence Notch-dependent germ cell behavior remain unclear.

Purpose of the Study:

  • To investigate the role of somatic syndecan-1 (SDN-1) in regulating germ cell fate.
  • To elucidate the molecular pathway through which SDN-1 controls Notch receptor expression in the germline.
  • To understand how somatic signals integrate with germline development.

Main Methods:

  • Utilized Caenorhabditis elegans as a model organism.
  • Investigated the function of syndecan-1 (SDN-1) and its downstream targets.
  • Analyzed gene expression and protein-DNA interactions using molecular biology techniques.

Main Results:

  • SDN-1, a somatic proteoglycan, was found to control the expression of the GLP-1 Notch receptor in the germline.
  • SDN-1 signaling regulates a somatic TRP calcium channel.
  • This regulation influences the binding of transcription factor APTF-2 to the glp-1 promoter, promoting GLP-1 expression and mitotic germ cell fate.

Conclusions:

  • SDN-1 acts as a critical communication nexus between the somatic environment and the germline.
  • SDN-1 signaling pathways are essential for controlling germ cell fate decisions.
  • The findings provide novel insights into the molecular mechanisms governing germline development and stem cell maintenance.