A molecular mechanism of mitotic centrosome assembly in Drosophila
- University of Oxford, United Kingdom
- Medical Research Council Laboratory of Molecular Biology, United Kingdom
Abstract
Centrosomes comprise a pair of centrioles surrounded by pericentriolar material (PCM). The PCM expands dramatically as cells enter mitosis, but it is unclear how this occurs. Here, we show that the centriole protein Asl initiates the recruitment of DSpd-2 and Cnn to mother centrioles; both proteins then assemble into co-dependent scaffold-like structures that spread outwards from the mother centriole and recruit most, if not all, other PCM components. In the absence of either DSpd-2 or Cnn mitotic PCM assembly is diminished; in the absence of both proteins it appears to be abolished. We show that DSpd-2 helps incorporate Cnn into the PCM and that Cnn then helps maintain DSpd-2 within the PCM, creating a positive feedback loop that promotes robust PCM expansion around the mother centriole during mitosis. These observations suggest a surprisingly simple mechanism of mitotic PCM assembly in flies.
Article and author information
Author details
Reviewing Editor
- Jon Pines, The Gurdon Institute, United Kingdom
Version history
- Received: May 16, 2014
- Accepted: August 21, 2014
- Accepted Manuscript published: August 22, 2014 (version 1)
- Version of Record published: September 26, 2014 (version 2)
Copyright
© 2014, Conduit et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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A molecular mechanism of mitotic centrosome assembly in Drosophila
eLife 3:e03399.
https://doi.org/10.7554/eLife.03399
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