University of Massachusetts Medical School Faculty Publications

Title

Mismatch repair proteins and AID activity are required for the dominant negative function of C-terminally deleted AID in class switching

UMMS Affiliation

Department of Microbiology and Physiological Systems; Summer Undergraduate Research Experience

Publication Date

8-1-2014

Document Type

Article

Subjects

Animals; Cytidine Deaminase; DNA Mismatch Repair; Gene Deletion; Gene Rearrangement; Humans; Mice; Mice, Inbred C57BL; Mice, Knockout; Mutation; Peptide Fragments; Primary Cell Culture

Disciplines

Cellular and Molecular Physiology | Genetics | Immunology and Infectious Disease

Abstract

Activation-induced cytidine deaminase (AID) is essential for class-switch recombination (CSR) and somatic hypermutation (SHM) of Ig genes. The AID C terminus is required for CSR, but not for S-region DNA double-strand breaks (DSBs) during CSR, and it is not required for SHM. AID lacking the C terminus (DeltaAID) is a dominant negative (DN) mutant, because human patients heterozygous for this mutant fail to undergo CSR. In agreement, we show that DeltaAID is a DN mutant when expressed in AID-sufficient mouse splenic B cells. To have DN function, DeltaAID must have deaminase activity, suggesting that its ability to induce DSBs is important for the DN function. Supporting this hypothesis, Msh2-Msh6 have been shown to contribute to DSB formation in S regions, and we find in this study that Msh2 is required for the DN activity, because DeltaAID is not a DN mutant in msh2(-/-) cells. Our results suggest that the DNA DSBs induced by DeltaAID are unable to participate in CSR and might interfere with the ability of full-length AID to participate in CSR. We propose that DeltaAID is impaired in its ability to recruit nonhomologous end joining repair factors, resulting in accumulation of DSBs that undergo aberrant resection. Supporting this hypothesis, we find that the S-S junctions induced by DeltaAID have longer microhomologies than do those induced by full-length AID. In addition, our data suggest that AID binds Smu regions in vivo as a monomer.

Rights and Permissions

Citation: J Immunol. 2014 Aug 1;193(3):1440-50. doi: 10.4049/jimmunol.1400365. Epub 2014 Jun 27. Link to article on publisher's site

Related Resources

Link to Article in PubMed

Journal/Book/Conference Title

Journal of immunology (Baltimore, Md. : 1950)

PubMed ID

24973444