V(D)J recombinase binding and cleavage of cryptic recombination signal sequences identified from lymphoid malignancies

The Journal of Biological Chemistry
Ming Zhang, Patrick C Swanson

Abstract

V(D)J recombination is a process integral to lymphocyte development. However, this process is not always benign, since certain lymphoid malignancies exhibit recurrent chromosomal abnormalities, such as translocations and deletions, that harbor molecular signatures suggesting an origin from aberrant V(D)J recombination. Translocations involving LMO2, TAL1, Ttg-1, and Hox11, as well as a recurrent interstitial deletion at 1p32 involving SIL/SCL, are cited examples of illegitimate V(D)J recombination. Previous studies using extrachromosomal substrates reveal that cryptic recombination signal sequences (cRSSs) identified near the translocation breakpoint in these examples support V(D)J recombination with efficiencies ranging from about 30- to 20,000-fold less than bona fide V(D)J recombination signals. To understand the molecular basis for these large differences, we investigated the binding and cleavage of these cRSSs by the RAG1/2 proteins that initiate V(D)J recombination. We find that the RAG proteins comparably bind all cRSSs tested, albeit more poorly than a consensus RSS. We show that four cRSSs that support levels of V(D)J recombination above background levels in cell culture (LMO2, TAL1, Ttg-1, and SIL) are also cleaved by...Continue Reading

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Citations

Nov 9, 2011·Molecular and Cellular Biology·Noriko ShimazakiMichael R Lieber
Mar 26, 2009·BMC Molecular Biology·Ming Zhang, Patrick C Swanson
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