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Updated: May 26, 2026

Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
08:01

Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal

Published on: May 30, 2012

Recruitment of Oct4 protein to UV-damaged chromatin in embryonic stem cells

Eva Bártová1, Gabriela Šustáčková, Lenka Stixová

  • 1Department of Molecular Cytology and Cytometry, Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic. bartova@ibp.cz

Plos One
|December 14, 2011
PubMed
Abstract

Insights

Embryonic stem cell (ESC) pluripotency factor Oct4 accumulates at DNA damage sites in an ATP-dependent manner. This ESC-specific response involves histone modifications and is crucial for maintaining genomic integrity.

Area of Science:

  • Stem cell biology
  • Genomic integrity
  • DNA damage response

Background:

  • Oct4 is a key marker of embryonic stem cell (ESC) pluripotency.
  • Understanding Oct4's response to DNA damage is crucial for ESC applications in regenerative medicine.
  • Little is known about how Oct4 interacts with damaged chromatin.

Purpose of the Study:

  • To investigate Oct4's recognition of damaged chromatin in mouse ESCs.
  • To elucidate the mechanisms underlying Oct4's response to DNA damage.
  • To contribute to the understanding of ESC genomic integrity maintenance.

Main Methods:

  • Time-lapse confocal microscopy
  • UV laser microirradiation
  • Induction of DNA lesions
  • GFP-Oct4 expression
  • Histone modification analysis (H3K9 deacetylation, H2AX phosphorylation)

Main Results:

  • Oct4 accumulates in UV-damaged regions in an ATP-dependent manner.
  • Oct4 accumulation is not accompanied by Nanog or c-MYC recruitment.
  • Oct4 accumulation coincides with H3K9 deacetylation and H2AX phosphorylation (γH2AX).
  • ESC-specific nuclear distribution of γH2AX observed.
  • Inhibition of histone deacetylases reduced Oct4 accumulation at damaged sites.

Conclusions:

  • Demonstrates pluripotency-specific events in DNA damage response.
  • Highlights the role of Oct4 in maintaining ESC genomic integrity under genotoxic stress.
  • Suggests mechanisms by which ESCs may prevent genomic instability.

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