The RAG recombinase dictates functional heterogeneity and cellular fitness in natural killer cells.
The RAG recombinase dictates functional heterogeneity and cellular fitness in natural killer cells.
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DOI:
10.1016/j.cell.2014.08.026
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发表时间:
2014-09-25
期刊:
影响因子:
64.5
通讯作者:
Sun JC
中科院分区:
文献类型:
--
作者:
Karo JM;Schatz DG;Sun JC
The emergence of the recombination activating genes (RAG) in jawed vertebrates endowed adaptive immune cells with the ability to assemble a diverse set of antigen receptor genes. In contrast, innate lymphocytes such as natural killer (NK) cells are not believed to require RAG. Here, we report that select subsets of NK cells unable to express RAG or RAG endonuclease activity during ontogeny exhibit cell-intrinsic hyper-responsiveness but diminished capacity to survive following virus-driven proliferation. This deficit in cell survival may stem in part from reduced expression of DNA damage response mediators and defects in the repair of DNA breaks. Evidence for this novel function of RAG was also observed in T cells and innate lymphoid cells (ILC), revealing an unexpected role for the RAG proteins beyond V(D)J recombination. We propose that DNA cleavage events mediated by RAG endow developing adaptive and innate lymphocytes with a cellular “fitness” that safeguards their persistence later in life during episodes of rapid proliferation or cellular stress.
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