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Two rotating cilia in the node cavity are sufficient to break left-right symmetry in the mouse embryo

Shinohara, Kyosuke
Kawasumi, Aiko
Takamatsu, Atsuko
Yoshiba, Satoko
Botilde, Yanick
Motoyama, Noboru
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Published in Nature communications. 2012, vol. 3, 622
Abstract Determination of left-right asymmetry in mouse embryos is achieved by a leftward fluid flow (nodal flow) in the node cavity that is generated by clockwise rotational movement of 200-300 cilia in the node. The precise action of nodal flow and how much flow input is required for the robust read-out of left-right determination remains unknown. Here we show that a local leftward flow generated by as few as two rotating cilia is sufficient to break left-right symmetry. Quantitative analysis of fluid flow and ciliary rotation in the node of mouse embryos shows that left-right asymmetry is already established within a few hours after the onset of rotation by a subset of nodal cilia. Examination of various ciliary mutant mice shows that two rotating cilia are sufficient to initiate left-right asymmetric gene expression. Our results suggest the existence of a highly sensitive system in the node that is able to sense an extremely weak unidirectional flow, and may favour a model in which the flow is sensed as a mechanical force.
Keywords AnimalsBiophysics/methodsBody Patterning/geneticsCilia/physiologyDevelopmental Biology/methodsEmbryo Culture TechniquesEmbryo, Mammalian/metabolism/physiologyGene Expression Regulation, DevelopmentalMethylcellulose/chemistryMiceMice, Inbred C57BLMice, Inbred ICRModels, BiologicalMutationOrganizers, Embryonic/physiologyTime Factors
PMID: 22233632
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Research group Groupe Reith Walter (pathologie et immunologie) (282)
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SHINOHARA, Kyosuke et al. Two rotating cilia in the node cavity are sufficient to break left-right symmetry in the mouse embryo. In: Nature communications, 2012, vol. 3, p. 622. doi: 10.1038/ncomms1624 https://archive-ouverte.unige.ch/unige:43438

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Deposited on : 2014-12-15

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