Role of Ca(2+) transients at the node of the mouse embryo in breaking of left-right symmetry

Immotile cilia sense extracellular signals such as fluid flow, but whether Ca(2+) plays a role in flow sensing has been unclear. Here, we examined the role of ciliary Ca(2+) in the flow sensing that initiates the breaking of left-right (L-R) symmetry in the mouse embryo. Intraciliary and cytoplasmic...

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Detalles Bibliográficos
Autores principales: Mizuno, Katsutoshi, Shiozawa, Kei, Katoh, Takanobu A., Minegishi, Katsura, Ide, Takahiro, Ikawa, Yayoi, Nishimura, Hiromi, Takaoka, Katsuyoshi, Itabashi, Takeshi, Iwane, Atsuko H., Nakai, Junichi, Shiratori, Hidetaka, Hamada, Hiroshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7375832/
https://www.ncbi.nlm.nih.gov/pubmed/32743070
http://dx.doi.org/10.1126/sciadv.aba1195
Descripción
Sumario:Immotile cilia sense extracellular signals such as fluid flow, but whether Ca(2+) plays a role in flow sensing has been unclear. Here, we examined the role of ciliary Ca(2+) in the flow sensing that initiates the breaking of left-right (L-R) symmetry in the mouse embryo. Intraciliary and cytoplasmic Ca(2+) transients were detected in the crown cells at the node. These Ca(2+) transients showed L-R asymmetry, which was lost in the absence of fluid flow or the PKD2 channel. Further characterization allowed classification of the Ca(2+) transients into two types: cilium-derived, L-R-asymmetric transients (type 1) and cilium-independent transients without an L-R bias (type 2). Type 1 intraciliary transients occurred preferentially at the left posterior region of the node, where L-R symmetry breaking takes place. Suppression of intraciliary Ca(2+) transients delayed L-R symmetry breaking. Our results implicate cilium-derived Ca(2+) transients in crown cells in initiation of L-R symmetry breaking in the mouse embryo.