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Updated: Jun 23, 2026

Functional Manipulation of Maternal Gene Products Using In Vitro Oocyte Maturation in Zebrafish
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Functional Manipulation of Maternal Gene Products Using In Vitro Oocyte Maturation in Zebrafish

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O-GlcNAc modifications regulate cell survival and epiboly during zebrafish development.

Danielle M Webster1, Chin Fen Teo, Yuhua Sun

  • 1Department of Cellular Biology, The University of Georgia, Athens, GA 30602, USA. dwebster@hodges.edu

BMC Developmental Biology
|April 23, 2009
PubMed
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O-linked beta-N-acetylglucosamine (O-GlcNAc) modifications are crucial for zebrafish development, regulating cell death and epiboly. Disrupting O-GlcNAc levels leads to developmental defects and impacts the Pou5f1/Oct4 transcription factor.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Biology

Background:

  • O-linked beta-N-acetylglucosamine (O-GlcNAc) is a post-translational modification regulating protein activity.
  • O-GlcNAc Transferase (Ogt) and O-GlcNAcase (Oga) enzymes control O-GlcNAc levels.
  • Ogt and Oga influence insulin signaling in adult mice, but Ogt loss is lethal in embryonic stem cells, suggesting developmental roles.

Purpose of the Study:

  • To investigate the role of O-GlcNAc modifications in zebrafish development.
  • To understand how O-GlcNAc impacts embryonic development and cellular processes.

Main Methods:

  • Zebrafish embryos were used as a model organism.
  • O-GlcNAc levels were manipulated by overexpressing Ogt or Oga, or by using morpholinos against Ogt transcripts.

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  • Embryo development, cell counts, cell death rates, germ layer specification, and cytoskeletal organization were analyzed.

    • Main Results:

    • Altering O-GlcNAc levels resulted in embryos with shortened body axes, reduced brains, fewer cells, and increased cell death.
    • Embryos showed disorganized germ layer derivatives and severe disorganization after gastrulation.
    • Cytoskeletal defects were observed, resembling those in embryos lacking Pou5f1/Oct4 function, which is modified by O-GlcNAc.

    Conclusions:

    • O-GlcNAc modifications regulate proteins involved in apoptosis and epiboly movements during zebrafish development.
    • O-GlcNAc modifications do not appear to regulate germ layer specification.
    • The transcription factor Spiel ohne grenzen/Pou5f1 is modified by O-GlcNAc, suggesting a role in regulating its activity.