Aberrant V(D)J Recombination is Not Required for Rapid Development of H2ax/p53-deficient Thymic Lymphomas with Clonal Translocations

Overview

Journal Blood

Publisher Elsevier

Specialty Hematology

Date 2007 Sep 15

PMID 17855626

Citations 11

Authors

Craig H Bassing

Sheila Ranganath

Mike Murphy

Velibor Savic

Meagan Gleason

Frederick W Alt

Affiliations

Soon will be listed here.

Abstract

Histone H2AX is required to maintain genomic stability in cells and to suppress malignant transformation of lymphocytes in mice. H2ax(-/-)p53(-/-) mice succumb predominantly to immature alphabeta T-cell lymphomas with translocations, deletions, and genomic amplifications that do not involve T-cell receptor (TCR). In addition, H2ax(-/-)p53(-/-) mice also develop at lower frequencies B and T lymphomas with antigen receptor locus translocations. V(D)J recombination is initiated through the programmed induction of DNA double-strand breaks (DSBs) by the RAG1/RAG2 endonuclease. Because promiscuous RAG1/RAG2 cutting outside of antigen receptor loci can promote genomic instability, H2ax(-/-)p53(-/-) T-lineage lymphomas might arise, at least in part, through erroneous V(D)J recombination. Here, we show that H2ax(-/-)p53(-/-)Rag2(-/-) mice exhibit a similar genetic predisposition as do H2ax(-/-)p53(-/-) mice to thymic lymphoma with translocations, deletions, and amplifications. We also found that H2ax(-/-)p53(-/-)Rag2(-/-) mice often develop thymic lymphomas with loss or deletion of the p53(+) locus. Our data show that aberrant V(D)J recombination is not required for rapid onset of H2ax/p53-deficient thymic lymphomas with genomic instability and that H2ax deficiency predisposes p53(-/-)Rag2(-/-) thymocytes to transformation associated with p53 inactivation. Thus, H2AX is essential for suppressing the transformation of developing thymocytes arising from the aberrant repair of spontaneous DSBs.

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