Humoral immunity in mammals relies on the function of two developmentally and functionally distinct B-cell subsets-B1 and B2 cells. While B2 cells are responsible for the adaptive response to environmental antigens, B1 cells regulate the production of polyreactive and low-affinity antibodies for innate humoral immunity. The molecular mechanism of B-cell specification into different subsets is understudied. In this study, we identified lysine methyltransferase NSD2 (MMSET/WHSC1) as a critical regulator of B1 cell development. In contrast to its minor impact on B2 cells, deletion of the catalytic domain of NSD2 in primary B cells impairs the generation of B1 lineage. Thus, NSD2, a histone H3 K36 dimethylase, is the first-in-class epigenetic regulator of a B-cell lineage in mice.

Bioinformatics Resource Center Rockefeller University New York NY USA

Bristol Meyers Squibb Princeton NJ USA

Departments of Pediatrics Cell and Developmental Biology Weill Cornell Medical College New York NY USA

Epinova DPU Immuno Inflammation Therapy Area GlaxoSmithKline R and D Stevenage UK

Laboratory of Immune Cell Epigenetics and Signaling Rockefeller University New York NY USA

Life Science Research Centre University of Ostrava Ostrava Czech Republic

NYU Langone Medical Center and School of Medicine New York NY USA

Penn Epigenetics Institute Department of Biochemistry and Biophysics Perelman School of Medicine University of Pennsylvania Philadelphia PA USA

Sechenov 1st Moscow State Medical University Moscow Russia

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