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• W2003844978 endingPage "428" @default.
• W2003844978 startingPage "413" @default.
• W2003844978 abstract "Gastrulation is a critical stage of metazoan development during which endodermal and mesodermal tissues are internalized, and morphogenesis transforms the early embryo into each animal’s unique body-plan. While gastrulation has been studied extensively in classic model systems such as flies, worms, and vertebrates, less is known about gastrulation at a mechanistic level in other taxa. Surprisingly, one particularly neglected group constitutes a major branch of animals: the Spiralia. A unique feature of spiralian development is that taxa with diverse adult body-plans, such as annelids, molluscs, nemerteans and platyhelminths all share a highly stereotyped suite of characters during embryogenesis called spiral cleavage. The spiral cleavage program makes it possible to compare distantly related embryos using not only morphological features, and gene expression patterns, but also homologous cell lineages. Having all three criteria available for comparison is especially critical for understanding the evolution of a complex process like gastrulation. Thus studying gastrulation in spiralians is likely to lead to novel insights about the evolution of body-plans, and the evolution of morphogenesis itself. Here we review relevant literature about gastrulation in spiralians and frame questions for future studies. We describe the internalization of the endoderm, endomesoderm and ectomesoderm; where known, we review data on the cellular and molecular control of those processes. We also discuss several morphogenetic events that are tied to gastrulation including: axial elongation, origins of the mouth and anus, and the fate of the blastopore. Since spiral cleavage is ancestral for a major branch of bilaterians, understanding gastrulation in spiralians will contribute more broadly to ongoing debates about animal body-plan divergence, such as: the origin of the through-gut, the emergence of indirect versus direct development, and the evolution of gene-regulatory networks that specify endomesoderm. We emphasize the fact that spiralian gastrulation provides the unique opportunity to connect well-defined embryonic cell lineages to variation in cell fate and cell behavior, making it an exceptional case study for evo-devo." @default.
• W2003844978 created "2016-06-24" @default.
• W2003844978 creator A5007518629 @default.
• W2003844978 creator A5077284308 @default.
• W2003844978 date "2014-01-01" @default.
• W2003844978 modified "2023-09-29" @default.
• W2003844978 title "Ins and outs of Spiralian gastrulation" @default.
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