---
title: "H2Aub-centered chromatin polyvalency controls temporal gene regulation and organogenesis"
id: "biorxiv-12-hierarchical-chromatin-polyvalency-governs-robust-gene-regulation-and"
canonical_url: "https://medichelpline.com/clinical-feed/biorxiv-12-hierarchical-chromatin-polyvalency-governs-robust-gene-regulation-and"
content_type: "clinical_feed_article"
specialty: "General"
source_name: "bioRxiv (Biomedical Preprints)"
source_url: "https://www.biorxiv.org/content/10.64898/2026.09.15.751898v1?rss=1"
published_at: "2026-09-20T12:00:00.000Z"
evidence_level: "Verified Feed"
license: "CC-BY-NC-4.0 / Informational Use"
---
# H2Aub-centered chromatin polyvalency controls temporal gene regulation and organogenesis
## Provenance & Clinical Metadata
- **Canonical URL:** https://medichelpline.com/clinical-feed/biorxiv-12-hierarchical-chromatin-polyvalency-governs-robust-gene-regulation-and
- **Specialty:** [General](https://medichelpline.com/clinical-feed/general.md)
- **Primary Source:** bioRxiv (Biomedical Preprints)
- **Source URL:** [Original Journal Publication](https://www.biorxiv.org/content/10.64898/2026.09.15.751898v1?rss=1)
- **Published At:** 2026-09-20T12:00:00.000Z
- **Evidence Rating:** Verified Feed
## Executive GIST (TL;DR)
- Precise timing of gene expression is essential for embryonic development; the chromatin basis of transcriptional timing was investigated in post-implantation mouse embryos. - The classical **bivalency** model (coexistence of **H3K4me3** and **H3K27me3**) posits a poised state for activation, but this model does not fully explain activation dynamics observed after H3K27me3 depletion. - Temporal epigenomic profiling across post-implantation stages was combined with acute protein degradation using the dTAG system to dissect causal roles of chromatin marks. - The authors report that **H2Aub** (histone H2A monoubiquitination), not **H3K27me3**, functions as the primary transcriptional repressor in these embryos. - A hierarchical repression architecture is described: **H2Aub** enforces transcriptional silencing, while **H3K27me3** and **H3K9me3** act to reinforce and stabilize that silent state. - Disruption of the **H2Aub**-centered hierarchy perturbs temporal control of **polyvalent** gene activation, producing severe defects in organogenesis. - Mechanistically, acute loss of **H2Aub** interferes with the retinoic acid–FGF signaling axis and leads to arrest of somitogenesis. - The findings support a chromatin **polyvalency** model in which multiple repressive marks operate in a multi-layered, hierarchical fashion to control temporal gene expression during embryogenesis. - Competing interests: none declared. - Additional methodological, quantitative, and experimental detail were not reported in the source summary and would require consulting the full preprint for specifics.
## Clinical Analysis & Structured Key Points
Hierarchical chromatin polyvalency governs robust gene regulation and organogenesis | bioRxiv Skip to main content New Results Hierarchical chromatin polyvalency governs robust gene regulation and organogenesis Chengjie Zhou , Meng Wang , Zhiyuan Chen , Yi Zhang doi: https://doi.org/10.64898/2026.09.15.751898 Chengjie Zhou Program in Cellular and Molecular Medicine, Boston Childrens Hospital, Boston, MA02115, USA Find this author on Google Scholar Find this author on PubMed Search for this author on this site Meng Wang Program in Cellular and Molecular Medicine, Boston Childrens Hospital, Boston, MA02115, USA Find this author on Google Scholar Find this author on PubMed Search for this author on this site Zhiyuan Chen Program in Cellular and Molecular Medicine, Boston Childrens Hospital, Boston, MA02115, USA Find this author on Google Scholar Find this author on PubMed Search for this author on this site Yi Zhang Program in Cellular and Molecular Medicine, Boston Childrens Hospital, Boston, MA02115, USA Find this author on Google Scholar Find this author on PubMed Search for this author on this site For correspondence: yzhang{at}genetics.med.harvard.edu Abstract Info/History Metrics Preview PDF Abstract Precise temporal control of gene expression is fundamental for embryonic development, yet the epigenetic and chromatin basis governing transcriptional timing remain poorly understood. The bivalency model, characterized by coexistence of H3K4me3 and H3K27me3, has been proposed to mark a poised state ready for activation. However, this model has been challenged by lacking of rapid gene activation in response to H3K27me3 depletion, suggesting that the H3K27me3 mark is not responsible for the silencing. Here, through temporal epigenomic profiling of post-implantation mouse embryos and use of the protein degradation tag (dTAG) system, we demonstrate that H2Aub, but not H3K27me3, functions as the major repressor. We further reveal a hierarchical repression architecture in which H2Aub is responsible for transcriptional silencing, while H3K27me3 and H3K9me3 serve to reinforce the silencing state in post-implantation embryos. Functionally, disruption of this H2Aub-centered hierarchy perturbs temporal control of polyvalent gene activation, leading to severe organogenesis defects. Mechanistically, acute loss of H2Aub disrupts retinoic acid-FGF signaling pathway, causing somitogenesis arrest. Together, our findings establish chromatin polyvalency model as a multi-layered, hierarchical repression mechanism that governs temporal control of gene expression during embryogenesis. Competing Interest Statement The authors have declared no competing interest. Copyright The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license . Back to top Previous Next Posted September 20, 2026. Download PDF Email Thank you for your interest in spreading the word about bioRxiv. NOTE: Your email address is requested solely to identify you as the sender of this article. Your Email * Your Name * Send To * Enter multiple addresses on separate lines or separate them with commas. You are going to email the following Hierarchical chromatin polyvalency governs robust gene regulation and organogenesis Message Subject (Your Name) has forwarded a page to you from bioRxiv Message Body (Your Name) thought you would like to see this page from the bioRxiv website. Your Personal Message CAPTCHA This question is for testing whether or not you are a human visitor and to prevent automated spam submissions. Share Hierarchical chromatin polyvalency governs robust gene regulation and organogenesis Chengjie Zhou , Meng Wang , Zhiyuan Chen , Yi Zhang bioRxiv 2026.09.15.751898; doi: https://doi.org/10.64898/2026.09.15.751898 Share This Article: Copy Citation Tools Hierarchical chromatin polyvalency governs robust gene regulation and organogenesis Chengjie Zhou , Meng Wang , Zhiyuan Chen , Yi Zhang bioRxiv 2026.09.15.751898; doi: https://doi.org/10.64898/2026.09.15.751898 Citation Manager Formats BibTeX Bookends EasyBib EndNote (tagged) EndNote 8 (xml) Medlars Mendeley Papers RefWorks Tagged Ref Manager RIS Zotero Tweet Widget Facebook Like Google Plus One Subject Areas All Articles Animal Behavior and Cognition (8013) Biochemistry (18739) Bioengineering (14888) Bioinformatics (44418) Biophysics (22599) Cancer Biology (19723) Cell Biology (26899) Clinical Trials (138) Developmental Biology (13965) Ecology (21005) Epidemiology (2067) Evolutionary Biology (25455) Genetics (16166) Genomics (23507) Immunology (18705) Microbiology (42503) Molecular Biology (18059) Neuroscience (93451) Paleontology (700) Pathology (2977) Pharmacology and Toxicology (5095) Physiology (8114) Plant Biology (15999) Scientific Communication and Education (2095) Synthetic Biology (4560) Systems Biology (10235) Zoology (2391)
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