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Distinct β-catenins mediate adhesion and signalling functions in C. elegans

机译:不同的β-catenins介导秀丽隐杆线虫的黏附和信号传导功能

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摘要

In flies and vertebrates, Armadillo/β-catenin forms a complex with Tcf/Lef-1 transcription factors, serving as an essential co-activator to mediate Wnt signalling. It also associates with cadherins to mediate adhesion. In Caenorhabditis elegans, three putative β-catenin homologues have been identified: WRM-1, BAR-1 and HMP-2. WRM-1 and the Tcf homologue POP-1 mediate Wnt signalling by a mechanism that has challenged current views of the Wnt pathway. Here we show that BAR-1 is the only β-catenin homologue that interacts directly with POP-1. BAR-1 mediates Wnt signalling by forming a BAR-1/POP-1 bipartite transcription factor that activates expression of Wnt target genes such as the Hox gene mab-5. HMP-2 is the only β-catenin homologue that interacts with the single cadherin of C. elegans, HMR-1. We conclude that a canonical Wnt pathway exists in C. elegans. Furthermore, our analysis shows that the functions of C. elegans β-catenins in adhesion and in signalling are performed by separate proteins.
机译:在果蝇和脊椎动物中,犰狳/β-catenin与Tcf / Lef-1转录因子形成复合物,是介导Wnt信号转导的必需共激活因子。它还与钙黏着蛋白缔合以介导粘附。在秀丽隐杆线虫中,已鉴定出三个推定的β-连环蛋白同源物:WRM-1,BAR-1和HMP-2。 WRM-1和Tcf同源POP-1通过一种挑战Wnt途径当前观点的机制介导Wnt信号传导。在这里,我们显示BAR-1是唯一与POP-1直接相互作用的β-catenin同源物。 BAR-1通过形成BAR-1 / POP-1双向转录因子来介导Wnt信号,该因子激活Wnt靶基因(例如Hox基因mab-5)的表达。 HMP-2是唯一与秀丽隐杆线虫HMR-1的单个钙粘蛋白相互作用的β-catenin同源物。我们得出结论,秀丽隐杆线虫中存在典型的Wnt途径。此外,我们的分析表明,秀丽隐杆线虫β-catenins在粘附和信号传导中的功能是由单独的蛋白质执行的。

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