Determination of left–right patterning of the mouse embryo by artificial nodal flow (original) (raw)

Nature volume 418, pages 96–99 (2002)Cite this article

Abstract

Substantial insight has recently been achieved into the mechanisms responsible for the generation of left–right (L–R) asymmetry in the vertebrate body plan1,2,3,4. However, the mechanism that underlies the initial breaking of symmetry has remained unclear. In the mouse, a leftward fluid flow on the ventral side of the node caused by the vortical motion of cilia (referred to as nodal flow) is implicated in symmetry breaking5, but direct evidence for the role of this flow has been lacking. Here we describe the development of a system in which mouse embryos are cultured under an artificial fluid flow and with which we have examined how flow affects L–R patterning. An artificial rightward flow that was sufficiently rapid to reverse the intrinsic leftward nodal flow resulted in reversal of situs in wild-type embryos. The artificial flow was also able to direct the situs of mutant mouse embryos with immotile cilia. These results provide the first direct evidence for the role of mechanical fluid flow in L–R patterning.

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Acknowledgements

We thank I. Minoura for helpful discussion of hydrodynamics and K. Mochida and other members of the Hamada laboratory for technical help and valuable comments. This work was supported by CREST (Core Research for Evolutional Science and Technology) of the Japan Science and Technology Corporation. S.N. was supported by CREST and by a fellowship from the Japan Society for the Promotion of Science for Japanese Junior Scientists.

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Authors and Affiliations

  1. Graduate School of Frontier Biosciences, Osaka University, 1–3 Yamada-oka, 565-0871, Suita, Osaka, Japan
    Shigenori Nonaka, Hidetaka Shiratori, Yukio Saijoh & Hiroshi Hamada
  2. CREST, Japan Science and Technology Corporation (JST), Japan
    Shigenori Nonaka, Hidetaka Shiratori, Yukio Saijoh & Hiroshi Hamada

Authors

  1. Shigenori Nonaka
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  2. Hidetaka Shiratori
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  3. Yukio Saijoh
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  4. Hiroshi Hamada
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Correspondence toShigenori Nonaka or Hiroshi Hamada.

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Nonaka, S., Shiratori, H., Saijoh, Y. et al. Determination of left–right patterning of the mouse embryo by artificial nodal flow.Nature 418, 96–99 (2002). https://doi.org/10.1038/nature00849

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