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Histone H3.3 maintains genome integrity during mammalian development
Chuan-Wei Jang1, Yoichiro Shibata1, Joshua Starmer1
1Department of Genetics, Carolina Center for Genome Sciences, Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina 27599-7264, USA.
Genes & Development
|July 11, 2015
Summary
Histone H3.3 (H3.3) is crucial for mammalian development, maintaining genome integrity. Its absence causes developmental defects and embryonic lethality by disrupting heterochromatin structures.
Area of Science:
- Epigenetics and Developmental Biology
Background:
- Histone H3.3 (H3.3) is a conserved histone variant involved in cell differentiation and reprogramming.
- Mutations in H3.3 pathways are linked to human diseases, but its role in mammalian development is unclear.
Purpose of the Study:
- To investigate the essential role of Histone H3.3 in mammalian development.
Main Methods:
- Generation of H3.3-null mouse models using classical genetic approaches.
- Analysis of developmental phenotypes, cellular effects, gene regulation, and chromosomal structures.
Main Results:
- H3.3 depletion causes developmental retardation and early embryonic lethality.
- Loss of H3.3 leads to cell cycle suppression, cell death, and mitotic defects due to heterochromatin dysfunction.
- Karyotypical abnormalities and DNA damage activate the p53 pathway.
Conclusions:
- Histone H3.3 is essential for mammalian development, primarily by supporting heterochromatic structures.
- H3.3 maintains genome integrity during development, preventing mitotic defects and cell death.
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