Pax6-dependent, but β-catenin-independent, function of Bcl9 proteins in mouse lens development.

Pax6-dependent, but β-catenin-independent, function of Bcl9 proteins in mouse lens development.
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DOI:
10.1101/gad.246140.114
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发表时间:
2014-09-01
影响因子:
10.5
通讯作者:
Basler K
Basler K
中科院分区:
生物学1区
文献类型:
--
作者:
Cantù C;Zimmerli D;Hausmann G;Valenta T;Moor A;Aguet M;Basler K

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Bcl 9和Bcl 91(Bcl 9/91)编码介导β-连环蛋白和Pygo之间相互作用的Wnt信号传导组分。Cantonian等人发现Bcl 9/9 l以一种臀肌依赖性但β-连环蛋白非依赖性的方式促进眼透镜的形成。Pax 6是眼分化的主要调节因子,直接激活Bcl 9和Bcl 91转录。Bcl 9和Bcl 91(Bcl 9/91)编码Wnt信号传导组分,其分别通过两个进化上保守的结构域HD 1和HD2介导β-连环蛋白和Pygopus(Pygo)之间的相互作用。我们产生了缺乏这些结构域的小鼠品系,以探测Bcl 9/9 l和Pygo在小鼠发育期间的β-连环蛋白依赖性和β-连环蛋白非依赖性作用。虽然透镜的发育严重依赖于HD 1结构域的存在,但它不受HD 2结构域的缺乏的影响,这表明Bcl 9/9 1在这种情况下以β-连环蛋白非依赖性方式起作用。此外,我们发现了一个新的调节回路,其中Pax 6,眼睛发育的主调节器,直接激活Bcl 9/9 l转录。
Bcl9 and Bcl9l (Bcl9/9l) encode Wnt signaling components that mediate the interaction between β-catenin and Pygo. Cantù et al. find that Bcl9/9l contribute in a Pygo-dependent, but β-catenin-independent, fashion to eye lens formation. Pax6, the master regulator of eye differentiation, directly activates Bcl9 and Bcl9l transcription. Bcl9 and Bcl9l (Bcl9/9l) encode Wnt signaling components that mediate the interaction between β-catenin and Pygopus (Pygo) via two evolutionarily conserved domains, HD1 and HD2, respectively. We generated mouse strains lacking these domains to probe the β-catenin-dependent and β-catenin-independent roles of Bcl9/9l and Pygo during mouse development. While lens development is critically dependent on the presence of the HD1 domain, it is not affected by the lack of the HD2 domain, indicating that Bcl9/9l act in this context in a β-catenin-independent manner. Furthermore, we uncover a new regulatory circuit in which Pax6, the master regulator of eye development, directly activates Bcl9/9l transcription.
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