© Research
Laboratory Junior Group (G5)

Spatial Regulation of Genomes


The folding of chromosomes is a carefully regulated process, essential to the function and propagation of DNA molecule(s) over generations. Past and recent work have revealed its importance in bacteria or eukaryotes, where regulatory mechanisms have evolved to coordinate chromosome organization with other DNA-related metabolic processes such as segregation. Our research is focusing on the interplay between chromosome dynamics, cell cycle, and consequences on chromosome stability, that we study principally on microorganisms. To do so, we use a combination of genome-wide and single-cell technologies (3C, Hi-C, imaging), synthetic methods (neo-chromosome assembly), as well as in vitro and in vivo approaches.

Among our recent results, we are reaching at a better understanding of the organizational changes experienced by yeast and bacterial genomes during replication and cell cycle, and how it is being influenced by metabolism (e.g. Marbouty et al., 2015; Guidi et al., 2015). We also have concomitantly developed computational techniques aiming at improving genome assembly and metagenomic/pan-genomic analysis through the exploitation of chromosome physical 3D signatures (Marbouty et al., 2014; Marie-Nelly et al., 2014a, 2014b). These so-called “contact genomics” approaches (Flot et al., 2015) have opened up new, unanticipated areas of research, which holds potential for both fundamental discoveries and biomedical applications.

Our ongoing research projects include yeast chromosome dynamics during cell cycle; broadening our understanding of the regulation of chromosome organization and segregation in bacteria; influence of chromatin organization of meiotic double-strand break repair and mitotic genome stability. We also pursue our development of contact genomic applications, that we are now applying to a broad variety of questions, including metagenomic analysis, gene flow, and comparative genomics of complex genomes. Our projects usually involve collaborative efforts between geneticists, biophysicists and mathematicians, some in the lab and some through collaborations.


We work in close collaboration with Dr. Julien Mozziconacci (UPMC, Paris) and Dr. Marcelo Nollmann (CBS, Montpellier).

Check out our Github space for code and programs


Program Projects



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Phone: +33 1 40 61 33 25
Email: romain.koszul (at) pasteur.fr


Batiment Jacob

25-28 Rue du Docteur Roux
75015, Paris