Critical roles of the immunoglobulin intronic enhancers in maintaining the sequential rearrangement of IgH and Igk loci.

Critical roles of the immunoglobulin intronic enhancers in maintaining the sequential rearrangement of IgH and Igk loci.
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DOI:
10.1084/jem.20052310
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发表时间:
2006-07-10
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Xu Y
Xu Y
中科院分区:
其他
文献类型:
--
作者:
Inlay MA;Lin T;Gao HH;Xu Y

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免疫球蛋白(IG)重链(IgH)和轻链基因的V(D)J重组在原B细胞和前B细胞中顺序发生。为了鉴定决定这种重排顺序的顺式元件,我们在小鼠中将内源性基质附着区/Igk内含子增强子(MiEκ)替换为其重链对应物(Eμ)。这种替换(表示为EμR)显著增加了pro-B细胞中Vκ和Jκ基因座对V(D)J重组酶的可及性,并诱导这些细胞中的Igk重排。然而,EμR不支持前B细胞中的Igk重排。与MiEκ −/− pre-B细胞相似,与野生型pre-B细胞相比,EμR pre-B细胞中Vκ片段对V(D)J重组酶的可及性显著降低。因此,Eμ和MiEκ通过促进V、D和J位点对V(D)J重组酶的可及性,在维持IgH和Igk位点的顺序重排中发挥发育阶段特异性作用。
V(D)J recombination of immunoglobulin (Ig) heavy (IgH) and light chain genes occurs sequentially in the pro– and pre–B cells. To identify cis-elements that dictate this order of rearrangement, we replaced the endogenous matrix attachment region/Igk intronic enhancer (MiEκ) with its heavy chain counterpart (Eμ) in mice. This replacement, denoted EμR, substantially increases the accessibility of both Vκ and Jκ loci to V(D)J recombinase in pro–B cells and induces Igk rearrangement in these cells. However, EμR does not support Igk rearrangement in pre–B cells. Similar to that in MiEκ −/− pre–B cells, the accessibility of Vκ segments to V(D)J recombinase is considerably reduced in EμR pre–B cells when compared with wild-type pre–B cells. Therefore, Eμ and MiEκ play developmental stage-specific roles in maintaining the sequential rearrangement of IgH and Igk loci by promoting the accessibility of V, D, and J loci to the V(D)J recombinase.
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