The genetic program to specify ectodermal cells in ascidian embryos

Development, Growth & Differentiation
Boqi Liu, Y Satou

Abstract

The ascidian belongs to the sister group of vertebrates and shares many features with them. The gene regulatory network (GRN) controlling gene expression in ascidian embryonic development leading to the tadpole larva has revealed evolutionarily conserved gene circuits between ascidians and vertebrates. These conserved mechanisms are indeed useful to infer the original developmental programs of the ancestral chordates. Simultaneously, these studies have revealed which gene circuits are missing in the ascidian GRN; these gene circuits may have been acquired in the vertebrate lineage. In particular, the GRN responsible for gene expression in ectodermal cells of ascidian embryos has revealed the genetic programs that regulate the regionalization of the brain, formation of palps derived from placode-like cells, and differentiation of sensory neurons derived from neural crest-like cells. We here discuss how these studies have given insights into the evolution of these traits.

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Citations

Jun 2, 2020·Development, Growth & Differentiation·Takayuki Suzuki, Shigeyuki Koshikawa
Dec 23, 2020·Open Biology·Guillaume Poncelet, Sebastian M Shimeld

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