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ECB-ART-45744
Sci Rep 2017 Sep 07;71:10751. doi: 10.1038/s41598-017-10822-z.
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Calaxin establishes basal body orientation and coordinates movement of monocilia in sea urchin embryos.

Mizuno K , Shiba K , Yaguchi J , Shibata D , Yaguchi S , Prulière G , Chenevert J , Inaba K .


Abstract
Through their coordinated alignment and beating, motile cilia generate directional fluid flow and organismal movement. While the mechanisms used by multiciliated epithelial tissues to achieve this coordination have been widely studied, much less is known about regulation of monociliated tissues such as those found in the vertebrate node and swimming planktonic larvae. Here, we show that a calcium sensor protein associated with outer arm dynein, calaxin, is a critical regulator for the coordinated movements of monocilia. Knockdown of calaxin gene in sea urchin embryos results in uncoordinated ciliary beating and defective directional movement of the embryos, but no apparent abnormality in axoneme ultrastructure. Examination of the beating cycle of individual calaxin-deficient cilia revealed a marked effect on the waveform and spatial range of ciliary bending. These findings indicate that calaxin-mediated regulation of ciliary beating is responsible for proper basal body orientation and ciliary alignment in fields of monociliated cells.

PubMed ID: 28883641
PMC ID: PMC5589754
Article link: Sci Rep


Genes referenced: dnah3 LOC100887844 tubgcp2
Morpholinos: LOC115929736 MO1


Article Images: [+] show captions
References [+] :
Afzelius, Cilia-related diseases. 2004, Pubmed