Abstract:
:The histone variants H3.3 and H2A.Z have recently emerged as two of the most important features in transcriptional regulation, the molecular mechanism of which still remains poorly understood. In this study, we investigated the regulation of H3.3 and H2A.Z on chromatin dynamics during transcriptional activation. Our in vitro biophysical and biochemical investigation showed that H2A.Z promoted chromatin compaction and repressed transcriptional activity. Surprisingly, with only four to five amino acid differences from the canonical H3, H3.3 greatly impaired higher-ordered chromatin folding and promoted gene activation, although it has no significant effect on the stability of mononucleosomes. We further demonstrated that H3.3 actively marks enhancers and determines the transcriptional potential of retinoid acid (RA)-regulated genes via creating an open chromatin signature that enables the binding of RAR/RXR. Additionally, the H3.3-dependent recruitment of H2A.Z on promoter regions resulted in compaction of chromatin to poise transcription, while RA induction results in the incorporation of H3.3 on promoter regions to activate transcription via counteracting H2A.Z-mediated chromatin compaction. Our results provide key insights into the mechanism of how histone variants H3.3 and H2A.Z function together to regulate gene transcription via the modulation of chromatin dynamics over the enhancer and promoter regions.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Chen P,Zhao J,Wang Y,Wang M,Long H,Liang D,Huang L,Wen Z,Li W,Li X,Feng H,Zhao H,Zhu P,Li M,Wang QF,Li Gdoi
10.1101/gad.222174.113subject
Has Abstractpub_date
2013-10-01 00:00:00pages
2109-24issue
19eissn
0890-9369issn
1549-5477pii
gad.222174.113journal_volume
27pub_type
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