Abstract
Antigen receptor variable-(diversity)-joining (V(D)J) recombination at the locus encoding the T cell antigen receptor-β (Tcrb) is ordered, with Dβ-to-Jβ assembly preceding Vβ-to-DJβ joining. The molecular mechanism underlying this 'preferred' order of rearrangement remains unclear. Here we show that the Dβ 23–base pair recombination signal sequence (Dβ 23-RSS) contains a specific AP-1 transcription factor–binding site bound by AP-1 and its component c-Fos expressed at a specific stage. Cell-based recombination assays suggested that c-Fos interacted directly with the RAG recombinase and enhanced its deposition to Dβ 23-RSSs, thus conferring the priority of DJβ recombination. Loss of c-Fos decreased Tcrb recombination efficiency and disrupted recombination ordering in vivo. Our results show an unexpected function for c-Fos as a direct regulator of Tcrb recombination, rather than its usual function as a transcription regulator, and provide new insight into the mechanisms of recombination ordering.
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Acknowledgements
We thank D. Schatz (Yale University), S. Desiderio (Johns Hopkins University) and M. Gellert (National Institutes of Health) for recombination plasmids; R. Bosselut, D. Li and S. Li for instructive comments on the manuscript; Q. Yuan for animal husbandry; and Z. Tan for cell sorting and flow cytometry analysis. Supported by the National Natural Science Foundation of China (30671913 and 30623003), the Ministry of Science and Technology (2006CB504303 and 2007CB815802), the National High-Tech Research and Development Program of China (2007AA02Z167), the National Basic Research Program of China (2007CB914504), the Chinese Academy of Sciences (KSCX1-YW-R-43 and KSCX2-YW-R-10) and the Council of Shanghai Municipal Government for Science and Technology (05QMX1460 and 06DZ22032).
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X.Wa. designed and did most experiments, analyzed data and prepared the manuscript; G.X. and X.We. constructed plasmids; Y.Z. did the coimmunoprecipitation and GST precipitation assays; X.G. and S.O. provided materials; and X.L. conceptualized the research, directed the study and prepared the manuscript.
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Wang, X., Xiao, G., Zhang, Y. et al. Regulation of Tcrb recombination ordering by c-Fos-dependent RAG deposition. Nat Immunol 9, 794–801 (2008). https://doi.org/10.1038/ni.1614
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DOI: https://doi.org/10.1038/ni.1614
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