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Distinct molecular cues ensure a robust microtubule-dependent nuclear positioning in the Drosophila oocyte.


ABSTRACT: Controlling nucleus localization is crucial for a variety of cellular functions. In the Drosophila oocyte, nuclear asymmetric positioning is essential for the reorganization of the microtubule (MT) network that controls the polarized transport of axis determinants. A combination of quantitative three-dimensional live imaging and laser ablation-mediated force analysis reveal that nuclear positioning is ensured with an unexpected level of robustness. We show that the nucleus is pushed to the oocyte antero-dorsal cortex by MTs and that its migration can proceed through distinct tracks. Centrosome-associated MTs favour one migratory route. In addition, the MT-associated protein Mud/NuMA that is asymmetrically localized in an Asp-dependent manner at the nuclear envelope hemisphere where MT nucleation is higher promotes a separate route. Our results demonstrate that centrosomes do not provide an obligatory driving force for nuclear movement, but together with Mud, contribute to the mechanisms that ensure the robustness of asymmetric nuclear positioning.

SUBMITTER: Tissot N 

PROVIDER: S-EPMC5414183 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature

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Distinct molecular cues ensure a robust microtubule-dependent nuclear positioning in the Drosophila oocyte.

Tissot Nicolas N   Lepesant Jean-Antoine JA   Bernard Fred F   Legent Kevin K   Bosveld Floris F   Martin Charlotte C   Faklaris Orestis O   Bellaïche Yohanns Y   Coppey Maïté M   Guichet Antoine A  

Nature communications 20170427


Controlling nucleus localization is crucial for a variety of cellular functions. In the Drosophila oocyte, nuclear asymmetric positioning is essential for the reorganization of the microtubule (MT) network that controls the polarized transport of axis determinants. A combination of quantitative three-dimensional live imaging and laser ablation-mediated force analysis reveal that nuclear positioning is ensured with an unexpected level of robustness. We show that the nucleus is pushed to the oocyt  ...[more]

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