Role for Msh5 in the regulation of Ig class switch recombination

Role for Msh5 in the regulation of Ig class switch recombination.

Ig class switch recombination (CSR) and somatic hypermutation serve to diversify antibody responses and are orchestrated by the activity of activation-induced cytidine deaminase and many proteins involved in DNA repair and genome surveillance. Msh5, a gene encoded in the central MHC class III region, and its obligate heterodimerization partner Msh4 have a critical role in regulating meiotic hom...

Nibrin functions in Ig class-switch recombination.

Nijmegen breakage syndrome (NBS) is a rare autosomal recessive disorder characterized by predisposition to hematopoietic malignancy, cell-cycle checkpoint defects, and ionizing radiation sensitivity. NBS is caused by a hypomorphic mutation of the NBS1 gene, encoding nibrin, which forms a protein complex with Mre11 and Rad50, both involved in DNA repair. Nibrin localizes to chromosomal sites of ...

Role in Ig Class Switch Recombination Switch Region Identity Plays an Important

Cutting edge: CTNNBL1 is dispensable for Ig class switch recombination.

Ig class switch recombination (CSR) and somatic hypermutation require activation-induced cytidine deaminase (AID). The search for AID-interaction factors has been a major research effort in the field, as the mechanism of preferential targeting of AID to Ig loci remains elusive. CTNNBL1 is one of the few identified AID-interacting factors and has been shown to affect AID-mediated mutation and ge...

T CELL REGULATION OF THE Ig CLASS SWITCH

Signals from thymus-processed T cells are important in determining the quantities of various immunoglobul in (Ig) classes of ant ibody (Ab) 1 synthesized in response to antigen (1-6). We have recently reported that T cells can preferentially enhance the production of certain IgG isotypes, namely IgG2a, in the B cell response to the type 2 T-independent (TI-2) antigen, 2 trinitrophenyl (TNP)-Fic...