Divergent roles of RelA and c-Rel in establishing chromosomal loops upon activation of the Igkappa gene.

Divergent roles of RelA and c-Rel in establishing chromosomal loops upon activation of the Igkappa gene.
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DOI:
10.4049/jimmunol.0901781
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发表时间:
2009-09-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Garrard WT
Garrard WT
中科院分区:
其他
文献类型:
--
作者:
Liu Z;Ma Z;Terada LS;Garrard WT

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真核生物基因表达的精确调控需要远端顺式作用调控序列与插入DNA之间的相互作用,但反式作用调控蛋白如何在基因激活过程中建立和维持DNA环仍然是未知的。LPS诱导的小鼠IGκ基因在B淋巴细胞中的转录利用三个远端增强子,并需要转录因子NF-κB,其家族成员包括RelA和c-Rel。使用染色体构象捕获技术结合染色质免疫沉淀,在这里,我们证明了LPS诱导的IGκ基因激活通过将远端增强子和RNA聚合酶II之间的所有三个成对相互作用桥接在一起而产生染色体环,这是这些环的碱基的明显分子纽带。RelA和肌动蛋白聚合对于触发这些过程是必不可少的,这些过程不需要新的转录、蛋白质合成或c-Rel。因此,我们确定了在IGκ基因激活过程中建立高级染色质重组的必需和非必需事件。
Precise regulation of eukaryotic gene expression requires interactions between distal cis-acting regulatory sequences with the looping out of the intervening DNA, but how trans-acting regulatory proteins work to establish and maintain DNA loops during gene activation remains largely unexplored. LPS-induced transcription of the mouse Igκ gene in B lymphocytes utilizes three distal enhancers and requires the transcription factor NF-κB, whose family members include RelA and c-Rel. Using chromosome conformation capture technology in combination with chromatin immunoprecipitation, here we demonstrate that LPS-induced Igκ gene activation creates chromosomal loops by bridging together all three pair-wise interactions between the distal enhancers and RNA polymerase II, the apparent molecular tie for the bases of these loops. RelA and actin polymerization are essential for triggering these processes, which do not require new transcription, protein synthesis or c-Rel. We have thus identified both essential and non-essential events that establish higher-order chromatin reorganization during Igκ gene activation.
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