FGF signaling acts on different levels of mesoderm development within Spiralia

Author:

Andrikou Carmen12ORCID,Hejnol Andreas12ORCID

Affiliation:

1. University of Bergen, Department of Biological Sciences, Thormøhlensgate 55, 5006 Bergen, Norway

2. Sars International Centre for Marine Molecular Biology, University of Bergen, Thormøhlensgate 55, 5006 Bergen, Norway

Abstract

ABSTRACT FGF signaling is involved in mesoderm induction in members of deuterostomes (e.g. tunicates, hemichordates), but not in flies and nematodes, in which it has a role in mesoderm patterning and migration. However, we need comparable studies in other protostome taxa in order to decipher whether this mesoderm-inducing function of FGF extends beyond the lineage of deuterostomes. Here, we investigated the role of FGF signaling in mesoderm development in three species of lophophorates, a clade within the protostome group Spiralia. Our gene expression analyses show that the mesodermal molecular patterning is conserved between brachiopods and phoronids, but the spatial and temporal recruitment of transcription factors differs significantly. Moreover, the use of the inhibitor SU5402 demonstrates that FGF signaling is involved in different steps of mesoderm development, as well as in morphogenetic movements of gastrulation and axial elongation. Our findings suggest that the mesoderm-inducing role of FGF extends beyond the group of deuterostomes.

Funder

Horizon 2020 Framework Programme

Publisher

The Company of Biologists

Subject

Developmental Biology,Molecular Biology

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