Controlling long-range genomic interactions at a native locus by targeted tethering of a looping factor.

Controlling long-range genomic interactions at a native locus by targeted tethering of a looping factor.
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DOI:
10.1016/j.cell.2012.03.051
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发表时间:
2012-06-08
期刊:
影响因子:
64.5
通讯作者:
Blobel GA
Blobel GA
中科院分区:
生物学1区
文献类型:
--
作者:
Deng W;Lee J;Wang H;Miller J;Reik A;Gregory PD;Dean A;Blobel GA

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Chromatin loops juxtapose distal enhancers with active promoters but their molecular architecture and relationship with transcription remain unclear. In erythroid cells, the locus control region (LCR) and β-globin promoter form a chromatin loop that requires transcription factor GATA1 and the associated molecule Ldb1. We employed artificial zinc fingers (ZF) to tether Ldb1 to the β-globin promoter in GATA1 null erythroblasts in which the β-globin locus is relaxed and inactive. Remarkably, targeting Ldb1 or only its self-association domain to the β-globin promoter substantially activated β-globin transcription in the absence of GATA1. Promoter-tethered Ldb1 interacted with endogenous Ldb1 complexes at the LCR to form a chromatin loop, causing recruitment and phosphorylation of RNA polymerase II. ZF-Ldb1 proteins were inactive at alleles lacking the LCR, demonstrating that their activities depend on long-range interactions. Our findings establish Ldb1 as critical effector of GATA1-mediated loop formation and indicate that chromatin looping causally underlies gene regulation.
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