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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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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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Oct4 controls basement membrane development during human embryogenesis.

Margit Rosner1, Markus Hengstschläger1

  • 1Institute of Medical Genetics, Center for Pathobiochemistry and Genetics, Medical University of Vienna, Vienna 1090, Austria.

Developmental Cell
|April 5, 2024
PubMed
Summary
This summary is machine-generated.

Basement membrane (BM) assembly and disassembly during early human development were studied. The transcription factor Oct4 was found to regulate BM development by controlling signaling pathways.

Keywords:
AktOct4Rac1basement membranehuman embryogenesishuman embryoid

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Area of Science:

  • Developmental Biology
  • Extracellular Matrix Biology
  • Human Embryogenesis

Background:

  • Basement membranes (BMs) are crucial extracellular matrix (ECM) structures supporting tissues and regulating cell behavior.
  • Dysfunctional BMs are implicated in various human diseases.
  • Understanding BM regulation in early human development is limited due to ethical and material constraints.

Purpose of the Study:

  • To investigate basement membrane (BM) assembly and disassembly during human post-implantation development.
  • To identify key regulators of BM development in early human embryos.
  • To elucidate the role of Oct4 in BM formation and signaling.

Main Methods:

  • Utilized the post-implantation amniotic sac embryoid (PASE) model.
  • Analyzed BM assembly during development and disassembly during primitive streak (PS) cell dissemination.
  • Investigated the regulatory role of Oct4 on BM components, receptors, and signaling pathways (Akt, Rac1).

Main Results:

  • Delineated BM assembly during post-implantation development and disassembly during primitive streak (PS) cell dissemination using the PASE model.
  • Demonstrated that the transcription factor Oct4 regulates the expression of BM structural components and receptors.
  • Showed Oct4 controls BM development via Akt signaling and the small GTPase Rac1.

Conclusions:

  • The study provides novel insights into basement membrane (BM) regulation during early human development.
  • Oct4 is identified as a key regulator of BM assembly and signaling in human embryogenesis.
  • These findings advance the understanding of early human development and associated diseases.