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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
Published on: September 20, 2018
O-GlcNAc transferase regulates mitotic chromatin dynamics
1Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
The Journal of Biological Chemistry
|September 1, 2010
Summary
Regulating N-acetylglucosamine (O-GlcNAc) transferase (OGT) levels during mitosis is vital for accurate chromosome segregation. OGT impacts histone modifications and protein localization, preventing errors in cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Faithful genome division during mitosis ensures genetic material is equally distributed to daughter cells.
- Histones are crucial for DNA organization, and their post-translational modifications are altered during mitosis, but their roles are not fully understood.
- N-acetylglucosamine (O-GlcNAc) transferase (OGT) modifies proteins, but its role in mitotic chromatin dynamics is poorly characterized.
Purpose of the Study:
- To investigate the role of OGT in regulating mitotic chromatin dynamics and chromosomal segregation.
- To determine how OGT levels during mitosis affect histone modifications and protein localization.
Main Methods:
- Studied OGT protein levels during M phase.
- Examined the effects of OGT overexpression on histone H3 post-translational modifications (Lys-9, Ser-10, Arg-17, Lys-27).
- Assessed the impact of OGT overexpression on coactivator-associated arginine methyltransferase 1 (CARM1) phosphorylation and localization.
- Quantified chromosomal bridge formation in response to OGT overexpression.
Main Results:
- OGT protein levels decrease during M phase.
- OGT overexpression altered specific histone H3 post-translational modifications.
- Overexpression of OGT inhibited CARM1 mitotic phosphorylation and correct localization.
- Increased abnormal chromosomal bridge formation was observed with OGT overexpression.
Conclusions:
- Regulating OGT levels during mitosis is essential for proper chromosomal segregation.
- OGT influences key events in mitosis, including histone modification and protein localization, to ensure genomic stability.
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