Probes of chromatin accessibility in the Drosophila bithorax complex respond differently to Polycomb‐mediated repression.

Probes of chromatin accessibility in the Drosophila bithorax complex respond differently to Polycomb‐mediated repression.
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果蝇双胸复合体中染色质可及性的探针对 Polycomb 介导的抑制反应不同。

DOI:
10.1002/j.1460-2075.1996.tb00389.x
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发表时间:
1996
期刊:
The EMBO Journal
影响因子:
--
通讯作者:
W. Bender
W. Bender
中科院分区:
--
文献类型:
--
作者:
K. Mccall;W. Bender

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果蝇同源异型基因的受抑制状态的维持需要多梳基因组(PcG)。PcG阻遏与酵母中的交配型沉默或果蝇中的异染色质位置效应之间存在相似性,这表明PcG阻遏可能涉及高度致密的染色质结构。为了测试这种结构,异源DNA结合蛋白被用作果蝇胚胎中DNA可及性的探针。将酵母转录激活因子GAL 4和噬菌体T7 RNA聚合酶的结合位点插入内源性Ultrabithorax(Ubx)基因的bithorax(bx)调控区,该基因受PcG调控。普遍表达的GAL4蛋白仅在bx区域活跃的后节中通过其结合位点指导转录。在更前部的节段中对GAL4激活的阻断依赖于Polycomb(Pc)功能。相比之下,T7 RNA聚合酶可以在胚胎的所有节段中从其靶启动子转录。因此,Pc介导的抑制阻断了活化的聚合酶II转录,但并不简单地排除所有蛋白质。
The Polycomb group (PcG) of genes are required for maintenance of the repressed state of the homeotic genes in Drosophila. There are similarities between the PcG repression and mating‐type silencing in yeast or heterochromatic position effect in Drosophila, which suggest that PcG repression may involve a highly compacted chromatin structure. To test for such a structure, heterologous DNA‐ binding proteins were used as probes for DNA accessibility in Drosophila embryos. Binding sites for the yeast transcriptional activator GAL4 and for bacteriophage T7 RNA polymerase were inserted into the bithorax (bx) regulatory region of the endogenous Ultrabithorax (Ubx) gene, which is regulated by the PcG. Ubiquitously expressed GAL4 protein directs transcription through its binding sites only in the posterior segments where the bx region is active. The block to GAL4 activation in the more anterior segments is dependent on Polycomb (Pc) function. In contrast, T7 RNA polymerase can transcribe from its target promoter in all segments of the embryo. Thus, Pc‐mediated repression blocks activated polymerase II transcription, but does not simply exclude all proteins.
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