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- W3128259904 abstract "Abstract A key problem in understanding chordate evolution has been the origin of sessility of ascidians, and whether the appendicularian free-living style represents a primitive or derived condition of tunicates. To address this problem, we performed comprehensive developmental and genomic comparative analyses of the cardiopharyngeal gene regulatory network (GRN) between appendicularians and ascidians. Our results reveal that the cardiopharyngeal GRN has suffered a process of evolutionary deconstruction with massive ancestral losses of genes ( Mesp , Ets1/2 , Gata4/5/6 , Mek1/2 , Tbx1/10 , and RA- and FGF-signaling related genes) and subfunctions (e.g. FoxF , Islet , Ebf , Mrf , Dach and Bmp signaling). These losses have led to the deconstruction of two modules of the cardiopharyngeal GRN that in ascidians are related to early and late multipotent state cells involved in lineage fate determination towards first and secondary heart fields, and siphon muscle. Our results allow us to propose an evolutionary scenario, in which the evolutionary deconstruction of the cardiopharyngeal GRN has had an adaptive impact on the acceleration of the developmental cardiac program, the redesign of the cardiac architecture into an open-wide laminar structure, and the loss of pharyngeal muscle. Our findings, therefore, provide evidence supporting that the ancestral tunicate had a sessile ascidian-like lifestyle, and points to the deconstruction of the cardiopharyngeal GRN in appendicularians as a key event that facilitated the evolution of their pelagic free-living style connected to the innovation of the house." @default.
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- W3128259904 date "2021-02-10" @default.
- W3128259904 modified "2023-10-18" @default.
- W3128259904 title "Cardiopharyngeal deconstruction and ancestral tunicate sessility" @default.
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- W3128259904 doi "https://doi.org/10.1101/2021.02.10.430586" @default.
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