Fog signaling has diverse roles in epithelial morphogenesis in insects
Matthew A Benton,
Rodrigo Nunes da Fonseca,
Cornelia von Levetzow,
Muhammad S. Hakeemi,
Kai H Conrads,
Kristen A. Panfilio,
Jeremy A. Lynch,
Posted 14 Mar 2019
bioRxiv DOI: 10.1101/578526 (published DOI: 10.7554/eLife.47346)
Posted 14 Mar 2019
The Drosophila Fog pathway represents one of the best-understood signaling cascades controlling epithelial morphogenesis. During gastrulation, Fog induces apical cell constrictions that drive the invagination of mesoderm and posterior gut primordia. The cellular mechanisms underlying primordia internalization vary greatly among insects and recent work has suggested that Fog signaling is specific to the fast mode of gastrulation found in some flies. On the contrary, here we show in the beetle Tribolium, whose development is broadly representative for insects, that Fog has multiple morphogenetic functions. It modulates mesoderm internalization and controls a massive posterior infolding involved in gut and extraembryonic development. In addition, Fog signaling affects blastoderm cellularization, primordial germ cell positioning and cuboidal-to-squamous cell shape transitions in the extraembryonic serosa. Comparative analyses with two other distantly related insect species reveals that Fog’s role during cellularisation is widely conserved and therefore might represent the ancestral function of the pathway.
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