The nuclear lamina couples mechanical forces to cell fate in the preimplantation embryo via actin organization

Robin M. Skory, Adam A. Moverley, Goli Ardestani, Yanina Alvarez, Ana Domingo-Muelas, Oz Pomp, Blake Hernandez, Piotr Tetlak, Stephanie Bissiere, Claudio D. Stern, Denny Sakkas () and Nicolas Plachta ()
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Robin M. Skory: University of Pennsylvania
Adam A. Moverley: University of Pennsylvania
Goli Ardestani: Boston IVF-Eugin Group
Yanina Alvarez: Universidad de Buenos Aires
Ana Domingo-Muelas: University of Pennsylvania
Oz Pomp: University of Pennsylvania
Blake Hernandez: University of Pennsylvania
Piotr Tetlak: University of Pennsylvania
Stephanie Bissiere: University of Pennsylvania
Claudio D. Stern: University College London
Denny Sakkas: Boston IVF-Eugin Group
Nicolas Plachta: University of Pennsylvania

Nature Communications, 2023, vol. 14, issue 1, 1-14

Abstract: Abstract During preimplantation development, contractile forces generated at the apical cortex segregate cells into inner and outer positions of the embryo, establishing the inner cell mass (ICM) and trophectoderm. To which extent these forces influence ICM-trophectoderm fate remains unresolved. Here, we found that the nuclear lamina is coupled to the cortex via an F-actin meshwork in mouse and human embryos. Actomyosin contractility increases during development, upregulating Lamin-A levels, but upon internalization cells lose their apical cortex and downregulate Lamin-A. Low Lamin-A shifts the localization of actin nucleators from nucleus to cytoplasm increasing cytoplasmic F-actin abundance. This results in stabilization of Amot, Yap phosphorylation and acquisition of ICM over trophectoderm fate. By contrast, in outer cells, Lamin-A levels increase with contractility. This prevents Yap phosphorylation enabling Cdx2 to specify the trophectoderm. Thus, forces transmitted to the nuclear lamina control actin organization to differentially regulate the factors specifying lineage identity.

Date: 2023
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DOI: 10.1038/s41467-023-38770-5

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