Genome wide nucleosome landscape shapes 3D chromatin organization

Research output: Contribution to journalJournal articleResearchpeer-review

Documents

  • Fulltext

    Final published version, 8.07 MB, PDF document

  • Shah Fouziya
  • Krietenstein, Nils
  • Ulfat Syed Mir
  • Jakub Mieczkowski
  • Masood A. Khan
  • Aemon Baba
  • Mohmmad Abaas Dar
  • Mohammad Altaf
  • Ajazul H. Wani

The hierarchical chromatin organization begins with formation of nucleosomes, which fold into chromatin domains punctuated by boundaries and ultimately chromosomes. In a hierarchal organization, lower levels shape higher levels. However, the dependence of higher-order 3D chromatin organization on the nucleosome-level organization has not been studied in cells. We investigated the relationship between nucleosome-level organization and higher-order chromatin organization by perturbing nucleosomes across the genome by deleting Imitation SWItch (ISWI) and Chromodomain Helicase DNA-binding (CHD1) chromatin remodeling factors in budding yeast. We find that changes in nucleosome-level properties are accompanied by changes in 3D chromatin organization. Short-range chromatin contacts up to a few kilo–base pairs decrease, chromatin domains weaken, and boundary strength decreases. Boundary strength scales with accessibility and moderately with width of nucleosome-depleted region. Change in nucleosome positioning seems to alter the stiffness of chromatin, which can affect formation of chromatin contacts. Our results suggest a biomechanical “bottom-up” mechanism by which nucleosome distribution across genome shapes 3D chromatin organization.

Original languageEnglish
Article numbereadn2955
JournalScience Advances
Volume10
Issue number23
Number of pages15
ISSN2375-2548
DOIs
Publication statusPublished - 2024

Bibliographical note

Publisher Copyright:
Copyright © 2024 The Authors, some rights reserved

ID: 395391459