Independent manipulation of histone H3 modifications in individual nucleosomes reveals the contributions of sister histones to transcription
- Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, China
- CAS-MPG Partner Institute for Computational Biology, China
Abstract
Histone tail modifications can greatly influence chromatin-associated processes. Asymmetrically modified nucleosomes exist in multiple cell types; however, whether modifications on both sister histones contribute equally to chromatin dynamics remains elusive. Here, we devised a bivalent nucleosome system that allowed for the constitutive assembly of asymmetrically modified sister histone H3s in nucleosomes in Saccharomyces cerevisiae. The sister H3K36 methylations independently affected cryptic transcription in gene coding regions, whereas sister H3K79 methylation had cooperative effects on gene silencing near telomeres. H3K4 methylation on sister histones played an independent role in suppressing the recruitment of Gal4 activator to the GAL1 promoter and inhibiting GAL1 transcription. Under starvation stress, sister H3K4 methylations acted cooperatively, independently or redundantly to regulate transcription. Thus, we provide a unique tool for comparing symmetrical and asymmetrical modifications of sister histone H3s in vivo.
Article and author information
Author details
Funding
National Natural Science Foundation of China (31521061)
- Jin-Qiu Zhou
National Natural Science Foundation of China (31230040)
- Jin-Qiu Zhou
Ministry of Science and Technology of the People's Republic of China (2016YFA0500701)
- Jin-Qiu Zhou
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Copyright
© 2017, Zhou et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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Independent manipulation of histone H3 modifications in individual nucleosomes reveals the contributions of sister histones to transcription
eLife 6:e30178.
https://doi.org/10.7554/eLife.30178
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