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Updated: Jun 1, 2026
08:01
Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
Published on: May 30, 2012
Polycomb repressive complex 2 is necessary for the normal site-specific O-GlcNAc distribution in mouse embryonic stem
Samuel A Myers1, Barbara Panning, Alma L Burlingame
1Department of Pharmaceutical Chemistry and Biochemistry, University of California, San Francisco, CA 94158, USA.
Summary
O-GlcNAcylation (O-GlcNAc) regulates cellular processes. Mouse O-GlcNAc transferase (OGT) is crucial for development, with its activity linked to Polycomb repressive complex 2 in embryonic stem cells.
Area of Science:
- Biochemistry
- Molecular Biology
- Developmental Biology
Background:
- O-linked N-acetylglucosamine (O-GlcNAc) is a dynamic posttranslational modification regulating diverse cellular functions.
- The enzyme O-GlcNAc transferase (OGT) catalyzes this modification and is essential for mammalian embryonic development.
- Understanding OGT's role in early development, particularly in stem cells, is critical.
Purpose of the Study:
- To identify nuclear proteins modified by O-GlcNAc in mouse embryonic stem cells (ESCs).
- To investigate the relationship between OGT and Polycomb group genes in mammals.
- To elucidate the regulatory mechanisms of OGT in early mouse development.
Main Methods:
- Proteomic analysis to map O-GlcNAcylation sites on nuclear proteins in mouse ESCs.
- Biochemical assays to assess the interaction and functional relationship between OGT and Polycomb repressive complex 2 (PRC2).
Main Results:
- Over 60 nuclear proteins were identified as O-GlcNAcylated, including several critical for ESC maintenance.
- Polycomb repressive complex 2 was found to be necessary for maintaining normal OGT levels and proper O-GlcNAc cellular distribution.
- A conserved link between OGT and Polycomb group genes, from flies to mammals, was established.
Conclusions:
- OGT plays a significant role in maintaining the ESC transcriptional repertoire through modification of key nuclear proteins.
- OGT's regulation by PRC2 suggests a mechanism for controlling O-GlcNAcylation dynamics during early development.
- These findings provide insights into OGT's function in transcriptional regulation and cell fate decisions in developing mouse embryos.
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