ECB-ART-48994
Development
2021 Oct 01;14819:. doi: 10.1242/dev.198614.
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Developmental single-cell transcriptomics in the Lytechinus variegatus sea urchin embryo.
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Using scRNA-seq coupled with computational approaches, we studied transcriptional changes in cell states of sea urchin embryos during development to the larval stage. Eighteen closely spaced time points were taken during the first 24 h of development of Lytechinus variegatus (Lv). Developmental trajectories were constructed using Waddington-OT, a computational approach to 'stitch' together developmental time points. Skeletogenic and primordial germ cell trajectories diverged early in cleavage. Ectodermal progenitors were distinct from other lineages by the 6th cleavage, although a small percentage of ectoderm cells briefly co-expressed endoderm markers that indicated an early ecto-endoderm cell state, likely in cells originating from the equatorial region of the egg. Endomesoderm cells also originated at the 6th cleavage and this state persisted for more than two cleavages, then diverged into distinct endoderm and mesoderm fates asynchronously, with some cells retaining an intermediate specification status until gastrulation. Seventy-nine out of 80 genes (99%) examined, and included in published developmental gene regulatory networks (dGRNs), are present in the Lv-scRNA-seq dataset and are expressed in the correct lineages in which the dGRN circuits operate.
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RO1 HD14483 NIH HHS , DGE-1644868 National Science Foundation, RO1 HD 14483 NIH HHS , IOS-1457305 National Science Foundation, Burroughs Wellcome Fund, Klarman Cell Observatory, Natural Sciences and Engineering Research Council of Canada, New Frontiers in Research Fund, Natural Sciences and Engineering Research Council of Canada Universities Space Research Association, T32 HD040372 NICHD NIH HHS , P01 HD037105 NICHD NIH HHS , R01 HD014483 NICHD NIH HHS
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