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Notch Signaling Pathway

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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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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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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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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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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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Mechanosignaling in vertebrate development.

Stefano Piccolo1, Hanna Lucie Sladitschek-Martens2, Michelangelo Cordenonsi2

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This summary is machine-generated.

Cell mechanics and mechanotransduction are crucial for embryonic development, influencing cell fate and tissue patterning. Emerging research highlights physical forces as key organizers in developmental biology.

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Area of Science:

  • Developmental Biology
  • Cell Mechanics
  • Mechanobiology

Background:

  • Cellular forces are integral to morphogenesis but their instructive role in cell fate determination was historically overlooked.
  • Challenges in translating physical cellular processes into molecular terms hindered research.
  • Recent advances in mechanotransduction principles are enabling experimental investigation.

Purpose of the Study:

  • To review the emerging field of developmental mechanics.
  • To highlight discoveries repositioning cell mechanics in vertebrate developmental biology.
  • To discuss the role of physical forces in cell fate and tissue organization.

Main Methods:

  • Review of current literature on mechanotransduction and developmental mechanics.
  • Analysis of actomyosin contractility, morphogen gradients, and lateral inhibition.
  • Examination of supracellular forces and material property changes in embryonic fields.

Main Results:

  • Actomyosin contractility integrates signals from morphogens, lateral inhibition, and mechanosignaling.
  • Supracellular forces and changes in tissue material properties act as mechanical organizers.
  • A continuum of forces links self-organizing movements to cell fate from early development to organogenesis.

Conclusions:

  • Cell mechanics and physical forces are central to developmental biology, influencing cell fate and patterning.
  • Mechanisms of developmental mechanics are relevant in organoids and tissue regeneration.
  • Investigating developmental mechanics offers broad impact for regenerative medicine, stem cells, and cancer biology.