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Developmental single-cell transcriptomics in the Lytechinus variegatus sea urchin embryo.

Abdull J Massri1, Laura Greenstreet2, Anton Afanassiev2

  • 1Department of Biology, Duke University, Durham, NC 27708, USA.

Development (Cambridge, England)
|August 31, 2021
PubMed
Summary

This study maps sea urchin embryo cell development using single-cell RNA sequencing. It reveals early divergence of cell lineages and validates developmental gene regulatory networks.

Keywords:
Cell lineageGene regulatory networksSea urchin embryoscRNA-seq

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Area of Science:

  • Developmental Biology
  • Genomics
  • Marine Biology

Background:

  • Understanding early animal development is crucial for evolutionary and genetic studies.
  • Sea urchins are model organisms for studying embryonic development.

Purpose of the Study:

  • To map transcriptional changes in sea urchin embryonic cell states during early development.
  • To reconstruct developmental trajectories and identify lineage divergences.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) of Lytechinus variegatus embryos.
  • Computational analysis using Waddington-OT to construct developmental trajectories.
  • Analysis of gene expression patterns to identify cell lineage markers.

Main Results:

  • Identified distinct developmental trajectories for skeletogenic, germ, ectodermal, and endomesodermal lineages.
  • Observed early divergence of cell fates, with ectodermal progenitors distinct by the 6th cleavage.
  • Found that 99% of examined genes in known developmental gene regulatory networks (dGRNs) were present and correctly expressed in the dataset.

Conclusions:

  • The study provides a high-resolution map of early sea urchin development at the single-cell level.
  • The findings validate the accuracy of computational tools and existing dGRNs in predicting developmental pathways.
  • This work offers insights into the conserved mechanisms of early metazoan development.