Role of BMP signaling and the homeoprotein Iroquois in the specification of the cranial placodal field

Developmental Biology
Alvaro GlavicRoberto Mayor

Abstract

Different types of placodes originate at the anterior border of the neural plate but it is still an unresolved question whether individual placodes arise as distinct ectodermal specializations in situ or whether all or a subset of the placodes originate from a common preplacodal field. We have analyzed the expression and function of the homeoprotein Iro1 in Xenopus and zebrafish embryos, and we have compared its expression with several preplacodal and placodal markers. Our results indicate that the iro1 genes are expressed in the preplacodal region, being one of the earliest markers for this area. We show that an interaction between the neural plate and the epidermis is able to induce the expression of several preplacodal markers, including Xiro1, by a similar mechanism to that previously shown for neural crest induction. In addition, we analyzed the role of BMP in the specification of the preplacodal field by studying the expression of the preplacodal markers Six1, Xiro1, and several specific placodal markers. We experimentally modified the level of BMP activity by three different methods. First, we implanted beads soaked with noggin in early neurula stage Xenopus embryos; second, we injected the mRNA that encodes a dominant n...Continue Reading

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