Global regulation of Hox gene expression in C. elegans by a SAM domain protein.

Global regulation of Hox gene expression in C. elegans by a SAM domain protein.
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SAM 结构域蛋白对秀丽隐杆线虫中 Hox 基因表达的全局调节。

DOI:
10.1016/s1534-5807(03)00136-9
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发表时间:
2003
期刊:
影响因子:
11.8
通讯作者:
Emmons,ScottW
Emmons,ScottW
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang,Hong;Azevedo,RicardoBR;Lints,Robyn;Doyle,Christina;Teng,Yingqi;Haber,Daniel;Emmons,ScottW

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Polycomb group(PcG)对C. elegansHox基因尚未得到证实,与PcG复合物之一(PRC 1)的组分同源的基因尚未在C. elegansgenome.我们发现在C. SOP-2是一种与PcG蛋白相关但不同源的蛋白质,SOP-2突变导致Hox基因的广泛异位表达和同源异型转化。SOP-2含有SAM结构域,这是在其他阻遏物中发现的自缔合蛋白结构域,包括PRC 1和ETS转录因子的核心组分。系统发育分析表明,这个域是更密切相关的ETS家庭比那些的PcG蛋白。这些结果表明,在线虫的进化过程中,Hox基因的全局抑制已经被SAM结构域家族的不同分支所接管。
Polycomb group (PcG)-mediated repression ofC. elegansHox genes has not been demonstrated, and genes homologous to components of one of the PcG complexes (PRC1) have not been identified in theC. elegansgenome. We find that a mechanism of general Hox gene repression exists inC. elegans, carried out in part by SOP-2, a protein related to, but not orthologous with, any PcG protein.sop-2mutations lead to widespread ectopic expression of Hox genes and homeotic transformations. SOP-2 contains a SAM domain, a self-associating protein domain found in other repressors, including a core component of PRC1 and ETS transcription factors. Phylogenetic analysis indicates that this domain is more closely related to those of the ETS family than to those of PcG proteins. The results suggest that global repression of Hox genes has been taken over by a different branch of the SAM domain family during the evolution of nematodes.
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