IgD class switching is initiated by microbiota and limited to mucosa-associated lymphoid tissue in mice [Immunology and Inflammation]

Class-switch recombination (CSR) alters the Ig isotype to diversify antibody effector functions. IgD CSR is a rare event, and its regulation is poorly understood. We report that deficiency of 53BP1, a DNA damage-response protein, caused age-dependent overproduction of secreted IgD resulting from increased IgD CSR exclusively within B cells of...

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