期刊
ELIFE
卷 10, 期 -, 页码 -出版社
eLIFE SCIENCES PUBL LTD
DOI: 10.7554/eLife.66290
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- Japan Society for the Promotion of Science [JP17H05013, JP16K14785, JP20K06496, JP20H05397, 16H06279, JP18H05531, JP18K19310, JP19H04970, JP19H03158, JP20H05393, JP18K19432, JP19H05425, JP19H03211, JP20H05368]
- Japan Science and Technology Agency [JPMJPR2026, JPMJPR19K7, JMJCR16G1, JPMJER1901, CREST JPMJCR16G1]
- Japan Agency for Medical Research and Development [JP20ek0109489h0001, JP20am0101076]
- Nakajima Foundation
- Vehicle Racing Commemorative Foundation
- Princess Takamatsu Cancer Research Fund
- The Japan Society for the Promotion of Science [JP17K19356, JP17H03608, JP18H05527, JP18H04802, JP19H05244, JP20H00456, JP20H04846, JP18H05534, JP20H00449, JP17H01417, JP20H03520]
The RhIP assay was developed to study the targeting of histone variants to the genome in eukaryotes. The study showed that H3.1, H3.3, H2A, and H2A.Z are incorporated into chromatin in different manners, and that chromatin structure and DNA replication play crucial roles in determining histone deposition for maintaining epigenetic chromatin states.
In eukaryotes, histone variant distribution within the genome is the key epigenetic feature. To understand how each histone variant is targeted to the genome, we developed a new method, the RhIP (Reconstituted histone complex Incorporation into chromatin of Permeabilized cell) assay, in which epitope-tagged histone complexes are introduced into permeabilized cells and incorporated into their chromatin. Using this method, we found that H3.1 and H3.3 were incorporated into chromatin in replication-dependent and -independent manners, respectively. We further found that the incorporation of histones H2A and H2A.Z mainly occurred at less condensed chromatin (open), suggesting that condensed chromatin (closed) is a barrier for histone incorporation. To overcome this barrier, H2A, but not H2A.Z, uses a replication-coupled deposition mechanism. Our study revealed that the combination of chromatin structure and DNA replication dictates the differential histone deposition to maintain the epigenetic chromatin states.
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