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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Updated: Jun 1, 2025

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Foxi2 and Sox3 are master regulators controlling ectoderm germ layer specification.

Clark L Hendrickson1, Ira L Blitz1, Amina Hussein1,2

  • 1Developmental and Cell Biology, University of California, Irvine, CA, USA.

Biorxiv : the Preprint Server for Biology
|January 20, 2025
PubMed
Summary

Maternal transcription factors Foxi2 and Sox3 are key regulators of ectodermal germ layer specification in Xenopus. They control ectodermal gene activation by binding to cis-regulatory modules and shaping the epigenetic landscape.

Keywords:
Ep300Single nucleus RNA-seqXenopuscis-regulatory modulesepigeneticsgerm layersinner ectodermmaternal transcription factorsneuroectodermnon-neural ectodermouter ectodermsuper enhancers

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Area of Science:

  • Developmental Biology
  • Genetics
  • Epigenetics

Background:

  • Germ layer specification is crucial for vertebrate development, establishing distinct cell lineages from pluripotent cells.
  • Understanding the molecular mechanisms governing early cell fate decisions is fundamental to developmental biology.

Purpose of the Study:

  • To identify and characterize the master regulators of ectodermal germ layer specification in Xenopus.
  • To elucidate the molecular mechanisms by which these regulators control ectodermal gene expression and epigenetic landscape.

Main Methods:

  • Ectopic gene expression experiments in Xenopus embryos.
  • Transcriptomics (RNA sequencing) to analyze gene expression changes.
  • Chromatin immunoprecipitation (ChIP) assays to study transcription factor binding and histone modifications (H3K27ac).
  • Analysis of cis-regulatory modules (CRMs) and super-enhancers (SEs).

Main Results:

  • Foxi2 and Sox3 were identified as maternal transcription factors essential for ectodermal specification in Xenopus.
  • Co-expression of Foxi2 and Sox3 induced ectodermal markers and suppressed mesendodermal markers in prospective endodermal tissue.
  • Foxi2 and Sox3 jointly and independently regulate hundreds of ectodermal target genes.
  • These factors pre-bind to CRMs, facilitating Ep300 recruitment and H3K27ac deposition, thereby shaping the ectodermal epigenetic landscape.
  • CRMs associated with ectoderm-specific super-enhancers (SEs) are critical for robust ectodermal gene activation.

Conclusions:

  • Foxi2 and Sox3 act as central architects of ectodermal lineage specification in Xenopus.
  • The study highlights the role of ectodermal SE-associated CRMs in precise and robust gene activation during early development.
  • These findings provide critical insights into the transcriptional and epigenetic control of germ layer formation.