Novel roles for the radial spoke head protein 9 in neural and neurosensory cilia.

Novel roles for the radial spoke head protein 9 in neural and neurosensory cilia.
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DOI:
10.1038/srep34437
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发表时间:
2016-09-30
期刊:
影响因子:
4.6
通讯作者:
Grinblat Y
Grinblat Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sedykh I;TeSlaa JJ;Tatarsky RL;Keller AN;Toops KA;Lakkaraju A;Nyholm MK;Wolman MA;Grinblat Y

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Cilia are cell surface organelles with key roles in a range of cellular processes, including generation of fluid flow by motile cilia. The axonemes of motile cilia and immotile kinocilia contain 9 peripheral microtubule doublets, a central microtubule pair, and 9 connecting radial spokes. Aberrant radial spoke components RSPH1, 3, 4a and 9 have been linked with primary ciliary dyskinesia (PCD), a disorder characterized by ciliary dysmotility; yet, radial spoke functions remain unclear. Here we show that zebrafish Rsph9 is expressed in cells bearing motile cilia and kinocilia, and localizes to both 9 + 2 and 9 + 0 ciliary axonemes. Using CRISPR mutagenesis, we show that rsph9 is required for motility of presumptive 9 + 2 olfactory cilia and, unexpectedly, 9 + 0 neural cilia. rsph9 is also required for the structural integrity of 9 + 2 and 9 + 0 ciliary axonemes. rsph9 mutant larvae exhibit reduced initiation of the acoustic startle response consistent with hearing impairment, suggesting a novel role for Rsph9 in the kinocilia of the inner ear and/or lateral line neuromasts. These data identify novel roles for Rsph9 in 9 + 0 motile cilia and in sensory kinocilia, and establish a useful zebrafish PCD model.
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