Cantù C, Zimmerli D, Hausmann G, Valenta T, Moor A, Aguet M, Basler K. Pax6-dependent, but β-catenin-independent, function of
Bcl9 proteins in mouse lens development.
Genes Dev 2014;
28:1879-84. [PMID:
25184676 PMCID:
PMC4197948 DOI:
10.1101/gad.246140.114]
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Abstract
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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