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Gastrulation01:56

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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 will form...
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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 contrast, determination...
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Related Experiment Video

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Analysis of Transforming Growth Factor ß Family Cleavage Products Secreted Into the Blastocoele of Xenopus laevis Embryos
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PTBP1 is required for embryonic development before gastrulation.

Jakob Suckale1, Olivia Wendling, Jimmy Masjkur

  • 1Molecular Diabetology, Paul Langerhans Institute Dresden, School of Medicine and University Clinic Carl Gustav Carus, Dresden University of Technology, Dresden, Germany.

Plos One
|March 23, 2011
PubMed
Summary

Polypyrimidine-tract binding protein 1 (PTBP1) is crucial for embryonic development beyond the blastocyst stage. PTBP1 knockout mice show severe growth retardation and failed gastrulation, indicating its essential role in post-implantation development.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Polypyrimidine-tract binding protein 1 (PTBP1) regulates mRNA processing, including splicing, stability, and translation.
  • PTBP1 is known to be exploited by viruses for replication.
  • Its precise role in mammalian embryonic development is not fully understood.

Purpose of the Study:

  • To investigate the tissue expression pattern of PTBP1 during embryonic development.
  • To determine the consequences of PTBP1 absence on mouse embryonic development using a novel knockout model.

Main Methods:

  • Generation of a PTBP1 knockout mouse model.
  • Analysis of PTBP1 expression via PCR and immunofluorescence.
  • Phenotypic analysis of homozygous null embryos at various developmental stages (E7.5, mid-gestation).

Main Results:

  • PTBP1 is highly expressed in embryonic stem cells and developing embryonic tissues, particularly the brain and spinal cord.
  • PTBP1 knockout embryos implant but exhibit severe growth retardation starting at E7.5.
  • Homozygous null embryos fail to undergo gastrulation, showing defects in germ layer differentiation and extra-embryonic structures (ectoplacental cone, yolk sac).
  • All homozygous embryos are resorbed by mid-gestation, with none surviving to E12 or weaning.

Conclusions:

  • PTBP1 is dispensable for early zygotic development up to the blastocyst stage.
  • PTBP1 is essential for post-implantation embryonic development, including gastrulation and the formation of supportive extra-embryonic structures.
  • Complete loss of PTBP1 leads to embryonic lethality due to developmental arrest and failure to form key embryonic tissues.