Cilia at the node of mouse embryos sense fluid flow for left-right determination via Pkd2.

Cilia at the node of mouse embryos sense fluid flow for left-right determination via Pkd2.
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DOI:
10.1126/science.1222538
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发表时间:
2012-10-12
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Hamada H
Hamada H
中科院分区:
其他
文献类型:
--
作者:
Yoshiba S;Shiratori H;Kuo IY;Kawasumi A;Shinohara K;Nonaka S;Asai Y;Sasaki G;Belo JA;Sasaki H;Nakai J;Dworniczak B;Ehrlich BE;Pennekamp P;Hamada H

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单向流体流动在小鼠胚胎左右(L-R)对称性的破坏中起着至关重要的作用,但目前尚不清楚胚胎如何感知流动。我们报告说,钙通道Pkd 2是专门需要在节点周围冠细胞感测节点流量。对Pkd 2突变形式的研究表明,Pkd 2的纤毛定位对于正确的L-R模式是必不可少的。而Kif 3a突变胚胎,缺乏所有的纤毛,未能响应人工流,恢复初级纤毛在冠细胞挽救了响应流。因此,我们的研究结果表明,节点流感测的方式依赖于Pkd 2的冠细胞位于节点的边缘的纤毛。
Unidirectional fluid flow plays an essential role in the breaking of left-right (L-R) symmetry in mouse embryos, but it has remained unclear how the flow is sensed by the embryo. We report that the Ca2+ channel Pkd2 is required specifically in the peri-nodal crown cells for sensing the nodal flow. Examination of mutant forms of Pkd2 shows that the ciliary localization of Pkd2 is essential for correct L-R patterning. Whereas Kif3a mutant embryos, which lack all cilia, failed to respond to an artificial flow, restoration of primary cilia in crown cells rescued the response to the flow. Our results thus suggest that nodal flow is sensed in a manner dependent on Pkd2 by the cilia of crown cells located at the edge of the node.
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