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ATX-2, the C. elegans Ortholog of Human Ataxin-2, Regulates Centrosome Size and Microtubule Dynamics

Michael D. Stubenvoll, Jeffrey C. Medley, Miranda Irwin, View ORCID ProfileMi Hye Song
doi: https://doi.org/10.1101/076604
Michael D. Stubenvoll
1Department of Biological Sciences, Oakland University, Rochester, MI 48309, USA.
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Jeffrey C. Medley
1Department of Biological Sciences, Oakland University, Rochester, MI 48309, USA.
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Miranda Irwin
1Department of Biological Sciences, Oakland University, Rochester, MI 48309, USA.
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Mi Hye Song
1Department of Biological Sciences, Oakland University, Rochester, MI 48309, USA.
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Abstract

Centrosomes are critical sites for orchestrating microtubule dynamics, and exhibit dynamic changes in size during the cell cycle. As cells progress to mitosis, centrosomes recruit more microtubules (MT) to form mitotic bipolar spindles that ensure proper chromosome segregation. We report a new role for ATX-2, a C. elegans ortholog of Human Ataxin-2, in regulating centrosome size and MT dynamics. ATX-2, an RNA-binding protein, forms a complex with SZY-20 in an RNA-independent fashion. Depleting ATX-2 results in embryonic lethality and cytokinesis failure, and restores centrosome duplication to zyg-1 mutants. In this pathway, SZY-20 promotes ATX-2 abundance, which inversely correlates with centrosome size. Centrosomes depleted of ATX-2 exhibit elevated levels of centrosome factors (ZYG-1, SPD-5, γ-Tubulin), increasing MT nucleating activity but impeding MT growth. We show that ATX-2 influences MT behavior through γ-Tubulin at the centrosome. Our data suggest that RNA-binding proteins play an active role in controlling MT dynamics and provide insight into the control of proper centrosome size and MT dynamics.

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Posted September 21, 2016.
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ATX-2, the C. elegans Ortholog of Human Ataxin-2, Regulates Centrosome Size and Microtubule Dynamics
Michael D. Stubenvoll, Jeffrey C. Medley, Miranda Irwin, Mi Hye Song
bioRxiv 076604; doi: https://doi.org/10.1101/076604
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ATX-2, the C. elegans Ortholog of Human Ataxin-2, Regulates Centrosome Size and Microtubule Dynamics
Michael D. Stubenvoll, Jeffrey C. Medley, Miranda Irwin, Mi Hye Song
bioRxiv 076604; doi: https://doi.org/10.1101/076604

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