Dorso/ventral genes are asymmetrically expressed and involved in germ-layer demarcation during cnidarian gastrulation

Current Biology : CB
David Q MatusMark Q Martindale

Abstract

Cnidarians (corals, sea anemones, hydroids, and jellyfish) are a basal taxon closely related to bilaterally symmetrical animals and have been characterized as diploblastic and as radially symmetrical around their longitudinal axis. We show that some orthologs of key bilaterian dorso/ventral (D/V) patterning genes, including the TGFbeta signaling molecules NvDpp and NvBMP5-8 and their antagonist NvChordin, are initially expressed asymmetrically at the onset of gastrulation in the anthozoan sea anemone Nematostella vectensis. Surprisingly, unlike flies and vertebrates, the TGFbeta ligands and their antagonist are colocalized at the onset of gastrulation but then segregate by germ layer as gastrulation proceeds. TGFbeta ligands, their extracellular enhancer, NvTolloid, and components of their downstream signaling pathway (NvSmad1/5 and NvSmad4) are all coexpressed in presumptive endoderm, indicating that only planar TGFbeta signaling operates at these stages. NvChordin expression forms a boundary between TGFbeta-expressing endodermal cells and aboral ectoderm. Manipulation of nuclear beta-catenin localization affects TGFbeta ligand and antagonist expression, suggesting that the ancestral role of the dpp/chordin antagonism during g...Continue Reading

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