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Article Dans Une Revue Cellular and molecular immunology Année : 2023

A dual function for the chromatin organizer Special A-T rich Binding Protein 1 in B-lineage cells

Résumé

SATB1 (Special A-T rich Binding protein 1) is a cell type-specific factor that regulates the genetic network in developing T cells and neurons. In T cells, SATB1 is required for lineage commitment, VDJ recombination, development and maturation. Considering that its expression varies during B-cell differentiation, the involvement of SATB1 needs to be clarified in this lineage. Using a KO mouse model in which SATB1 was deleted from the pro-B-cell stage, we examined the consequences of SATB1 deletion in naive and activated B-cell subsets. Our model indicates first, unlike its essential function in T cells, that SATB1 is dispensable for B-cell development and the establishment of a broad IgH repertoire. Second, we show that SATB1 exhibits an ambivalent function in mature B cells, acting sequentially as a positive and negative regulator of Ig gene transcription in naive and activated cells, respectively. Third, our study indicates that the negative regulatory function of SATB1 in B cells extends to the germinal center response, in which this factor limits somatic hypermutation of Ig genes.
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Dates et versions

hal-04240912 , version 1 (13-11-2023)

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Morgane Thomas, Charlotte Bruzeau, Ophélie Alyssa Martin, Justine Pollet, Sébastien Bender, et al.. A dual function for the chromatin organizer Special A-T rich Binding Protein 1 in B-lineage cells. Cellular and molecular immunology, 2023, 20 (10), pp.1114-1126. ⟨10.1038/s41423-023-01069-y⟩. ⟨hal-04240912⟩
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