Diverse routes towards early somites in the mouse embryo

Carolina Guibentif, Jonathan A. Griffiths, Ivan Imaz-Rosshandler, Shila Ghazanfar, Jennifer Nichols, Valerie Wilson, Berthold Göttgens, John C Marioni

Research output: Contribution to journalArticlepeer-review

Abstract

Somite formation is foundational to creating the vertebrate segmental body plan. Here, we describe three trajectories towards somite formation in the early mouse embryo. Precursors of the anterior-most somites ingress through the primitive streak before E7 and migrate anteriorly by E7.5, while a second wave of more posterior somites develops in the vicinity of the streak.
Finally, neuromesodermal progenitors (NMPs) are set aside for subsequent trunk somitogenesis. Single-cell profiling of T-/- chimaeric embryos shows that the anterior somites develop in the
absence of T, and suggests a cell-autonomous function of T as a gatekeeper between paraxial mesoderm production and building of the NMP pool. Moreover, we identify putative regulators of early T-independent somites, and challenge the T-Sox2 cross-antagonism model in early NMPs. Our study highlights the concept of molecular flexibility during early cell type specification, with broad relevance for pluripotent stem cell differentiation and disease modelling.
Original languageEnglish
Pages (from-to)141-153.e6
Number of pages13
JournalDevelopmental Cell
Volume56
Issue number1
Early online date11 Dec 2020
DOIs
Publication statusPublished - 11 Jan 2021

Keywords

  • developmental trajectories
  • cell fate regulation
  • neuromesodermal progenitors
  • Brachyury
  • somites

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