The H2B deubiquitinase Usp22 promotes antibody class switch recombination by facilitating non-homologous end joining

Abstract

Class switch recombination (CSR) requires break and repair of immunoglobulin DNA. Here the authors show that the histone deubiquitinase Usp22 is involved in V(D)J recombination and CSR of IgG and IgE, but not IgA, and that IgG CSR is dependent on the canonical c-NHEJ pathway, whereas IgA CSR is more dependent on the alternative A-EJ pathway.