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:
影响因子:
--
通讯作者:
Garrard WT
中科院分区:
文献类型:
--
作者:
Liu Z;Ma Z;Terada LS;Garrard WT
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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