Pre-mitotic genome re-organisation bookends the B cell differentiation process

Wing Fuk Chan, Hannah D. Coughlan, Jie H. S. Zhou, Christine R. Keenan, Naiara G. Bediaga, Philip D. Hodgkin, Gordon K. Smyth, Timothy M. Johanson and Rhys S. Allan ()
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Wing Fuk Chan: The Walter and Eliza Hall Institute of Medical Research
Hannah D. Coughlan: The Walter and Eliza Hall Institute of Medical Research
Jie H. S. Zhou: The Walter and Eliza Hall Institute of Medical Research
Christine R. Keenan: The Walter and Eliza Hall Institute of Medical Research
Naiara G. Bediaga: The Walter and Eliza Hall Institute of Medical Research
Philip D. Hodgkin: The Walter and Eliza Hall Institute of Medical Research
Gordon K. Smyth: The Walter and Eliza Hall Institute of Medical Research
Timothy M. Johanson: The Walter and Eliza Hall Institute of Medical Research
Rhys S. Allan: The Walter and Eliza Hall Institute of Medical Research

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract During cellular differentiation chromosome conformation is intricately remodelled to support the lineage-specific transcriptional programs required for initiating and maintaining lineage identity. When these changes occur in relation to cell cycle, division and time in response to cellular activation and differentiation signals has yet to be explored, although it has been proposed to occur during DNA synthesis or after mitosis. Here, we elucidate the chromosome conformational changes in B lymphocytes as they differentiate and expand from a naive, quiescent state into antibody secreting plasma cells. We find gene-regulatory chromosome reorganization in late G1 phase before the first division, and that this configuration is remarkably stable as the cells massively and rapidly clonally expand. A second wave of conformational change occurs as cells terminally differentiate into plasma cells, coincident with increased time in G1 phase. These results provide further explanation for how lymphocyte fate is imprinted prior to the first division. They also suggest that chromosome reconfiguration occurs prior to DNA replication and mitosis, and is linked to a gene expression program that controls the differentiation process required for the generation of immunity.

Date: 2021
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DOI: 10.1038/s41467-021-21536-2

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