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2016 ; 27
(8
): 1204-9
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A prefoldin-associated WD-repeat protein (WDR92) is required for the correct
architectural assembly of motile cilia
#MMPMID26912790
Patel-King RS
; King SM
Mol Biol Cell
2016[Apr]; 27
(8
): 1204-9
PMID26912790
show ga
WDR92 is a highly conserved WD-repeat protein that has been proposed to be
involved in apoptosis and also to be part of a prefoldin-like cochaperone
complex. We found that WDR92 has a phylogenetic signature that is generally
compatible with it playing a role in the assembly or function of specifically
motile cilia. To test this hypothesis, we performed an RNAi-based knockdown of
WDR92 gene expression in the planarianSchmidtea mediterraneaand were able to
achieve a robust reduction in mRNA expression to levels undetectable under our
standard RT-PCR conditions. We found that this treatment resulted in a dramatic
reduction in the rate of organismal movement that was caused by a switch in the
mode of locomotion from smooth, cilia-driven gliding to muscle-based, peristaltic
contractions. Although the knockdown animals still assembled cilia of normal
length and in similar numbers to controls, these structures had reduced beat
frequency and did not maintain hydrodynamic coupling. By transmission electron
microscopy we observed that many cilia had pleiomorphic defects in their
architecture, including partial loss of dynein arms, incomplete closure of the
B-tubule, and occlusion or replacement of the central pair complex by accumulated
electron-dense material. These observations suggest that WDR92 is part of a
previously unrecognized cytoplasmic chaperone system that is specifically
required to fold key components necessary to build motile ciliary axonemes.