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Condensin- and replication-mediated bacterial chromosome folding and origin condensation revealed by Hi-C and super-resolution imaging

Lookup NU author(s): Dr Alan KohORCiD, Professor Heath Murray

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).

Abstract

Chromosomes of a broad range of species, from bacteria to mammals, are structured by large topological domains whose precise functional roles and regulatory mechanisms remain elusive. Here, we combine super-resolution microscopies and chromosome-capture technologies to unravel the higher-order organization of the Bacillus subtilis chromosome and its dynamic rearrangements during the cell cycle. We decipher the fine 3D architecture of the origin domain, revealing folding motifs regulated by condensin-like complexes. This organization, along with global folding throughout the genome, is present before replication, disrupted by active DNA replication, and re-established thereafter. Single-cell analysis revealed a strict correspondence between sub-cellular localization of origin domains and their condensation state. Our results suggest that the precise 3D folding pattern of the origin domain plays a role in the regulation of replication initiation, chromosome organization, and DNA segregation.

Publication metadata

Author(s): Marbouty M, LeGall A, Cattoni DI, Cournac A, Koh A, Fiche JB, Mozziconacci J, Murray H, Koszul R, Nollmann M

Publication type: Article

Publication status: Published

Journal: Molecular Cell

Year: 2015

Volume: 59

Issue: 4

Pages: 588-602

Print publication date: 20/08/2015

Online publication date: 20/08/2015

Acceptance date: 21/07/2015

Date deposited: 04/12/2017

ISSN (print): 1097-2765

ISSN (electronic): 1097-4164

Publisher: Cell Press

URL: http://dx.doi.org/10.1016/j.molcel.2015.07.020

DOI: 10.1016/j.molcel.2015.07.020

PubMed id: 26295962

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