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Related Experiment Videos

Programming of a repressed but committed chromatin structure during early development

M N Prioleau1, R S Buckle, M Méchali

  • 1Institut Jacques Monod, Molecular Embryology Unit, Paris, France.

The EMBO Journal
|October 16, 1995
PubMed
Summary

During early development in Xenopus, gene transcription is repressed before the mid-blastula transition (MBT). Transactivators cannot overcome this repression, but basal transcription machinery recruitment is the key limiting factor.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Gene Regulation

Background:

  • Chromatin accessibility and trans-acting factors are crucial for gene transcription.
  • Early embryonic development involves complex regulatory mechanisms controlling gene expression.

Purpose of the Study:

  • To investigate the role of chromatin and trans-acting factors in regulating gene transcription during early Xenopus development.
  • To identify the limiting factors for gene activation before and after the mid-blastula transition (MBT).

Main Methods:

  • Analysis of gene transcription in Xenopus embryos at different developmental stages.
  • Experiments involving pre-binding of TATA binding protein (TBP) and GAL4-VP16.

Main Results:

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  • Basal transcription is repressed before MBT, and transactivators cannot overcome this generalized repression.
  • Transactivators can bind to promoters, establishing a repressed chromatin structure before MBT.
  • The recruitment and stabilization of basal transcription machinery, not transactivators, is repressed before MBT.

Conclusions:

  • Gene activation is a multi-step process in early development, with promoter activation temporally uncoupled from commitment.
  • This regulatory mechanism may provide molecular signposts for future embryonic determinations.