High Fractional Occupancy of a Tandem Maf Recognition Element and Its Role in Long-Range β-Globin Gene Regulation.

High Fractional Occupancy of a Tandem Maf Recognition Element and Its Role in Long-Range β-Globin Gene Regulation.
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串联 Maf 识别元件的高分数占用及其在长程 β-珠蛋白基因调控中的作用。

DOI:
10.1128/mcb.00723-15
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发表时间:
2016
影响因子:
5.3
通讯作者:
Bungert,Jörg
Bungert,Jörg
中科院分区:
生物学2区
文献类型:
--
作者:
Stees,JaredR;Hossain,MirA;Sunose,Tomoki;Kudo,Yasushi;Pardo,CarolinaE;Nabilsi,NancyH;Darst,RussellP;Poudyal,Rosha;Igarashi,Kazuhiko;Huang,Suming;Kladde,MichaelP;Bungert,Jörg

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Enhancers and promoters assemble protein complexes that ultimately regulate the recruitment and activity of RNA polymerases. Previous work has shown that at least some enhancers form stable protein complexes, leading to the formation of enhanceosomes. We analyzed protein-DNA interactions in the murine β-globin gene locus using the methyltransferase accessibility protocol for individual templates (MAPit). The data show that a tandem Maf recognition element (MARE) in locus control region (LCR) hypersensitive site 2 (HS2) reveals a remarkably high degree of occupancy during differentiation of mouse erythroleukemia cells. Most of the other transcription factor binding sites in LCR HS2 or in the adult β-globin gene promoter regions exhibit low fractional occupancy, suggesting highly dynamic protein-DNA interactions. Targeting of an artificial zinc finger DNA-binding domain (ZF-DBD) to the HS2 tandem MARE caused a reduction in the association of MARE-binding proteins and transcription complexes at LCR HS2 and the adult βmajor-globin gene promoter but did not affect expression of the βminor-globin gene. The data demonstrate that a stable MARE-associated footprint in LCR HS2 is important for the recruitment of transcription complexes to the adult βmajor-globin gene promoter during erythroid cell differentiation.
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