The Journal of Experimental Medicine
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Published online September 4, 2007
doi:10.1084/jem.20070583
The Journal of Experimental Medicine, Vol. 204, No. 10, 2293-2303
The Rockefeller University Press, 0022-1007 $30.00
© 2007 Curry et al.
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ARTICLE

 Chromosomal reinsertion of broken RSS ends during T cell development

John D. Curry1, Danae Schulz1, Cynthia J. Guidos2,3, Jayne S. Danska2,3, Lauryl Nutter2,3, Andre Nussenzweig4, and Mark S. Schlissel1

1 Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720
2 Program in Developmental Biology, Hospital for Sick Children Research Institute, Toronto, ON, Canada M5G 1L7
3 Department of Immunology, Faculty of Medicine University of Toronto, Toronto, ON, Canada M5G 1L7
4 Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892

CORRESPONDENCE M.S. Schlissel: mss{at}berkeley.edu

The V(D)J recombinase catalyzes DNA transposition and translocation both in vitro and in vivo. Because lymphoid malignancies contain chromosomal translocations involving antigen receptor and protooncogene loci, it is critical to understand the types of "mistakes" made by the recombinase. Using a newly devised assay, we characterized 48 unique TCRß recombination signal sequence (RSS) end insertions in murine thymocyte and splenocyte genomic DNA samples. Nearly half of these events targeted "cryptic" RSS-like elements. In no instance did we detect target-site duplications, which is a hallmark of recombinase-mediated transposition in vitro. Rather, these insertions were most likely caused by either V(D)J recombination between a bona fide RSS and a cryptic RSS or the insertion of signal circles into chromosomal loci via a V(D)J recombination-like mechanism. Although wild-type, p53, p53 x scid, H2Ax, and ATM mutant thymocytes all showed similar levels of RSS end insertions, core-RAG2 mutant thymocytes showed a sevenfold greater frequency of such events. Thus, the noncore domain of RAG2 serves to limit the extent to which the integrity of the genome is threatened by mistargeting of V(D)J recombination.

Abbreviations used: ds, double strand; LM-TECA, ligation-mediated transferred-end capture assay; NHEJ, nonhomologous end joining; RSS, recombination signal sequence.


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