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The HP1α protein is mandatory to repress the circadian clock and its output genes during the 12 h period of transcriptional repression
The transcriptional repressions driven by the circadian core clock repressors RevErbα, E4BP4, and CRY1/PER1 involve feedback loops which are mandatory for generating the circadian rhythms. These repressors are known to bind to cognate DNA binding sites, but how their circadian bindings trigger the c...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
National Academy of Sciences
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9974504/ https://www.ncbi.nlm.nih.gov/pubmed/36791098 http://dx.doi.org/10.1073/pnas.2213075120 |
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author | Misra, Nisha Damara, Manohar Chambon, Pierre |
author_facet | Misra, Nisha Damara, Manohar Chambon, Pierre |
author_sort | Misra, Nisha |
collection | PubMed |
description | The transcriptional repressions driven by the circadian core clock repressors RevErbα, E4BP4, and CRY1/PER1 involve feedback loops which are mandatory for generating the circadian rhythms. These repressors are known to bind to cognate DNA binding sites, but how their circadian bindings trigger the cascade of events leading to these repressions remain to be elucidated. Through molecular and genetic analyses, we now demonstrate that the chromatin protein HP1α plays a key role in these transcriptional repressions of both the circadian clock (CC) genes and their cognate output genes (CCGs). We show that these CC repressors recruit the HP1α protein downstream from a repressive cascade, and that this recruitment is mandatory for the maintenance of both the CC integrity and the expression of the circadian genes. We further show that the presence of HP1α is critical for both the repressor-induced chromatin compaction and the generation of “transcriptionally repressed biomolecular hydrophobic condensates” and demonstrates that HP1α is mandatory within the CC output genes for both the recruitment of DNA methylating enzymes on the intronic deoxyCpG islands and their subsequent methylation. |
format | Online Article Text |
id | pubmed-9974504 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | National Academy of Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-99745042023-03-02 The HP1α protein is mandatory to repress the circadian clock and its output genes during the 12 h period of transcriptional repression Misra, Nisha Damara, Manohar Chambon, Pierre Proc Natl Acad Sci U S A Biological Sciences The transcriptional repressions driven by the circadian core clock repressors RevErbα, E4BP4, and CRY1/PER1 involve feedback loops which are mandatory for generating the circadian rhythms. These repressors are known to bind to cognate DNA binding sites, but how their circadian bindings trigger the cascade of events leading to these repressions remain to be elucidated. Through molecular and genetic analyses, we now demonstrate that the chromatin protein HP1α plays a key role in these transcriptional repressions of both the circadian clock (CC) genes and their cognate output genes (CCGs). We show that these CC repressors recruit the HP1α protein downstream from a repressive cascade, and that this recruitment is mandatory for the maintenance of both the CC integrity and the expression of the circadian genes. We further show that the presence of HP1α is critical for both the repressor-induced chromatin compaction and the generation of “transcriptionally repressed biomolecular hydrophobic condensates” and demonstrates that HP1α is mandatory within the CC output genes for both the recruitment of DNA methylating enzymes on the intronic deoxyCpG islands and their subsequent methylation. National Academy of Sciences 2023-02-15 2023-02-21 /pmc/articles/PMC9974504/ /pubmed/36791098 http://dx.doi.org/10.1073/pnas.2213075120 Text en Copyright © 2023 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
spellingShingle | Biological Sciences Misra, Nisha Damara, Manohar Chambon, Pierre The HP1α protein is mandatory to repress the circadian clock and its output genes during the 12 h period of transcriptional repression |
title | The HP1α protein is mandatory to repress the circadian clock and its output genes during the 12 h period of transcriptional repression |
title_full | The HP1α protein is mandatory to repress the circadian clock and its output genes during the 12 h period of transcriptional repression |
title_fullStr | The HP1α protein is mandatory to repress the circadian clock and its output genes during the 12 h period of transcriptional repression |
title_full_unstemmed | The HP1α protein is mandatory to repress the circadian clock and its output genes during the 12 h period of transcriptional repression |
title_short | The HP1α protein is mandatory to repress the circadian clock and its output genes during the 12 h period of transcriptional repression |
title_sort | hp1α protein is mandatory to repress the circadian clock and its output genes during the 12 h period of transcriptional repression |
topic | Biological Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9974504/ https://www.ncbi.nlm.nih.gov/pubmed/36791098 http://dx.doi.org/10.1073/pnas.2213075120 |
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