Mechanisms promoting translocations in editing and switching peripheral B cells.
Mechanisms promoting translocations in editing and switching peripheral B cells.
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DOI:
10.1038/nature08159
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发表时间:
2009-07-09
期刊:
影响因子:
64.8
通讯作者:
Alt, Frederick W.
中科院分区:
文献类型:
--
作者:
Wang, Jing H.;Gostissa, Monica;Yan, Catherine T.;Goff, Peter;Hickernell, Thomas;Hansen, Erica;Difilippantonio, Simone;Wesemann, Duane R.;Zarrin, Ali A.;Rajewsky, Klaus;Nussenzweig, Andre;Alt, Frederick W.
V(D)J recombination assembles immunoglobulin (Ig) heavy or light chain (IgH or IgL) variable region exons in developing bone marrow B cells, while class switch recombination (CSR) exchanges IgH constant region exons in peripheral B cells. Both processes employ DNA double strand breaks (DSBs) repaired by non-homologous end-joining (NHEJ). Errors in either V(D)J recombination or CSR can initiate chromosomal translocations, including oncogenic IgH/c-myc translocations of peripheral B cell lymphomas. Collaboration between these processes also has been proposed to initiate translocations. However, occurrence of V(D)J recombination in peripheral B cells is controversial. Here, we report that activated NHEJ-deficient splenic B cells accumulate V(D)J recombination-associated IgL chromosomal breaks, as well as CSR-associated IgH breaks, often in the same cell. Moreover, IgL breaks frequently are joined to IgH breaks to form translocations, a phenomenon associated with specific IgH/IgL co-localization. IgH and c-myc also co-localize in these cells; correspondingly, introduction of frequent c-myc DSBs robustly promotes IgH/c-myc translocations. Our studies reveal peripheral B cells that attempt secondary V(D)J recombination and elucidate a role for mechanistic factors in promoting recurrent translocations in tumors.
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发表时间:
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