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J Cell Biol. 2018 Jul 2;217(7):2365-2372. doi: 10.1083/jcb.201801032. Epub 2018 Apr 30.

Centrobin is essential for C-tubule assembly and flagellum development in Drosophila melanogaster spermatogenesis.

Author information

1
Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona, Spain.
2
Department of Life Sciences, University of Siena, Siena, Italy.
3
Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona, Spain gonzalez@irbbarcelona.org.
4
Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain.

Abstract

Centrobin homologues identified in different species localize on daughter centrioles. In Drosophila melanogaster sensory neurons, Centrobin (referred to as CNB in Drosophila) inhibits basal body function. These data open the question of CNB's role in spermatocytes, where daughter and mother centrioles become basal bodies. In this study, we report that in these cells, CNB localizes equally to mother and daughter centrioles and is essential for C-tubules to attain the right position and remain attached to B-tubules as well as for centrioles to grow in length. CNB appears to be dispensable for meiosis, but flagellum development is severely compromised in Cnb mutant males. Remarkably, three N-terminal POLO phosphorylation sites that are critical for CNB function in neuroblasts are dispensable for spermatogenesis. Our results underpin the multifunctional nature of CNB that plays different roles in different cell types in Drosophila, and they identify CNB as an essential component for C-tubule assembly and flagellum development in Drosophila spermatogenesis.

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