Abstract
Ciliogenesis requires the removal of CP110 from the mother centriole; actin dynamics also influence ciliation, at least partly by affecting the centrosomal accumulation of ciliogenic membrane vesicles. How these distinct processes are properly regulated remains unknown. Here we show that miR-129-3p, a microRNA conserved in vertebrates, controlled cilia biogenesis in cultured cells by concomitantly downregulating CP110 and repressing branched F-actin formation. Blocking miR-129-3p inhibited serum-starvation-induced ciliogenesis, whereas its overexpression potently induced ciliation in proliferating cells and also promoted cilia elongation. Gene expression analysis further identified ARP2, TOCA1, ABLIM1 and ABLIM3 as its targets in ciliation-related actin dynamics. Moreover, miR-129-3p inhibition in zebrafish embryos suppressed ciliation in Kupffer’s vesicle and the pronephros, and induced developmental abnormalities including a curved body, pericardial oedema and defective left–right asymmetry. Therefore, our results reveal a mechanism that orchestrates both the centriole-to-basal body transition and subsequent cilia assembly through microRNA-mediated post-transcriptional regulation.
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Acknowledgements
The authors thank X. Yuan and D. Li for helpful suggestions, and Y. You, S. L. Brody (Washington University School of Medicine) and D. J. Davidson (University of Edinburgh) for tips on MTEC culture. We also thank H. Zhao, M. Yao, J. Sun and Y. Wang for technical assistance. This work was supported by the National Basic Research Program of China (2012CB945003 and 2010CB912102), the National Science Foundation of China (30971430, 30830060 and 31010103910) and the Chinese Academy of Sciences (XDA01010107).
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X.Y. and X.Z. conceived and directed the project. Y.S. initiated the project and discovered the relationship between miR-129-3p and CP110 in cilia formation. J.C. discovered the regulation of miR-129-3p on actin regulators and performed most experiments. L.Z. carried out part of the luciferase and qRT-PCR assays. Y.X. fulfilled experiments with 129-MO2. Y.Z. performed wound-healing assays. Z.W. and Y.L. provided zebrafish eggs and microinjected 129-MO. X.Z., X.Y., J.C and Y.S designed experiments, interpreted data and wrote the paper.
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Cao, J., Shen, Y., Zhu, L. et al. miR-129-3p controls cilia assembly by regulating CP110 and actin dynamics. Nat Cell Biol 14, 697–706 (2012). https://doi.org/10.1038/ncb2512
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DOI: https://doi.org/10.1038/ncb2512
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