Graduate School of Frontier Biosciences, Osaka University

Japanese

Histone H4 acetylation required for chromatin decompaction during DNA replication

Journal Sci Rep 5, 12720 (2015)
Authors Ruan K (1), Yamamoto TG (2), Asakawa H (1), Chikashige Y (2), Kimura H (3), Masukata H (4), Haraguchi T (1, 2), Hiraoka Y (1, 2)

  1. Graduate School of Frontier Biosciences, Osaka University, Japan
  2. Advanced ICT Research Institute Kobe, National Institute of Information and Communications Technology, Japan
  3. Department of Biological Sciences, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Japan
  4. Department of Biological Sciences, Graduate School of Science, Osaka University, Japan
Title Histone H4 acetylation required for chromatin decompaction during DNA replication
PubMed 26223950
Laboratory Nuclear Dynamics Group 〈Prof. Hiraoka〉
Abstract Faithful DNA replication is a prerequisite for cell proliferation. Several cytological studies have shown that chromosome structures alter in the S-phase of the cell cycle. However, the molecular mechanisms behind the alteration of chromosome structures associated with DNA replication have not been elucidated. Here, we investigated chromatin structures and acetylation of specific histone residues during DNA replication using the meiotic nucleus of the fission yeast Schizosaccharomyces pombe. The S. pombe meiotic nucleus provides a unique opportunity for measuring the levels of compaction of chromatin along the chromosome in a defined orientation. By direct measurement of chromatin compaction in living cells, we demonstrated that decompaction of chromatin occurs during meiotic DNA replication. This chromatin decompaction was suppressed by depletion of histone acetyltransferase Mst1 or by arginine substitution of specific lysine residues (K8 and K12) of histone H4. These results suggest that acetylation of histone H4 residues K8 and K12 plays a critical role in loosening chromatin structures during DNA replication.

*This study was done by Kun Ruan, a graduate student of the FBS.

Figure 1. Schematic diagram of meiotic nucleus in fission yeast S. pombe.

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Figure 2. Histone acetylation associated with chromatin decompaction during DNA replication.

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