Úloha transkripčního faktoru Tcf7l1 a signalizační dráhy Wnt/β-katenin během diferenciace hlavového ektodermu.

Mašek, Jan

Differentiation of the head ectoderm is crucial for the evolutionary diversification of vertebrates. Expression of the genes responsible for this process is orchestrated troughout complex gene regulatory networks that are induced and modulated by Wnt, FGF and BMP signaling pathways. In addition, Wnt/β-catenin signaling, in combination with expression of the Wnt antagonists from the rostral-most part of the head ectoderm, represent a key source of information for the regionalization of the tissue along the antero-posterior axis. This allows the differentiation of the anterior ectoderm that gives rise to the anterior neural fold (ANF) and anterior part of the presumptive placodal region (PPR), and more posterior ectoderm where higher levels of active Wnt/β-catenin signaling promote differentiation into the neural crest (NC) and posterior PPR. Although the requirement of Wnt/β-catenin signalling for ANF, PPR and NC development has been intensively studied in non-mammalian vertebrate model organisms, we lack a clear picture about the situation in mammals. Furthermore, current knowledge in mammals has been gathered via experiments on the level of β-catenin and very little is known about the individual roles of the Tcf/Lef transcription factors. Thereby, we decided to manipulate the Tcf7l1, member of the...

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