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Histone H4 acetylation required for chromatin decompaction during DNA replication
Kun Ruan1, Takaharu G Yamamoto2, Haruhiko Asakawa1
1Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita 565-0871, Japan.
Scientific Reports
|July 31, 2015
Summary
Histone acetylation loosens chromatin structure during DNA replication. Specifically, histone H4 acetylation at lysine residues K8 and K12 is crucial for this process, enabling faithful cell proliferation.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Faithful DNA replication is essential for cell proliferation.
- Chromosome structure changes during the S-phase of the cell cycle, but underlying mechanisms remain unclear.
Purpose of the Study:
- To investigate chromatin structure and histone acetylation during DNA replication.
- To elucidate the molecular mechanisms of S-phase chromosome alterations.
Main Methods:
- Utilized the meiotic nucleus of fission yeast (Schizosaccharomyces pombe) for precise chromatin compaction measurements.
- Performed direct measurements of chromatin compaction in living cells.
- Assessed the impact of histone acetyltransferase Mst1 depletion and histone H4 lysine residue mutations (K8, K12) on chromatin structure.
Main Results:
- Demonstrated chromatin decompaction during meiotic DNA replication in living cells.
- Observed suppression of chromatin decompaction upon Mst1 depletion.
- Found that arginine substitution of histone H4 lysine residues K8 and K12 also suppressed decompaction.
Conclusions:
- Histone H4 acetylation at residues K8 and K12 is critical for loosening chromatin structure during DNA replication.
- These findings reveal a key molecular mechanism regulating chromosome dynamics in S-phase.
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