Microtubules are necessary for proper Reticulon localization during mitosis

Autoři: Ulises Diaz aff001;  Zane J. Bergman aff001;  Brittany M. Johnson aff001;  Alia R. Edington aff001;  Matthew A. de Cruz aff001;  Wallace F. Marshall aff002;  Blake Riggs aff001
Působiště autorů: Department of Biology, San Francisco State University, San Francisco, California, United States of America aff001;  Department of Biochemistry & Biophysics, UCSF Mission Bay, San Francisco, California, United States of America aff002
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226327


During mitosis, the structure of the Endoplasmic Reticulum (ER) displays a dramatic reorganization and remodeling, however, the mechanism driving these changes is poorly understood. Hairpin-containing ER transmembrane proteins that stabilize ER tubules have been identified as possible factors to promote these drastic changes in ER morphology. Recently, the Reticulon and REEP family of ER shaping proteins have been shown to heavily influence ER morphology by driving the formation of ER tubules, which are known for their close proximity with microtubules. Here, we examine the role of microtubules and other cytoskeletal factors in the dynamics of a Drosophila Reticulon, Reticulon-like 1 (Rtnl1), localization to spindle poles during mitosis in the early embryo. At prometaphase, Rtnl1 is enriched to spindle poles just prior to the ER retention motif KDEL, suggesting a possible recruitment role for Rtnl1 in the bulk localization of ER to spindle poles. Using image analysis-based methods and precise temporal injections of cytoskeletal inhibitors in the early syncytial Drosophila embryo, we show that microtubules are necessary for proper Rtnl1 localization to spindles during mitosis. Lastly, we show that astral microtubules, not microfilaments, are necessary for proper Rtnl1 localization to spindle poles, and is largely independent of the minus-end directed motor protein dynein. This work highlights the role of the microtubule cytoskeleton in Rtnl1 localization to spindles during mitosis and sheds light on a pathway towards inheritance of this major organelle.

Klíčová slova:

Cytoplasm – Drosophila melanogaster – Dyneins – Embryos – Endoplasmic reticulum – Metaphase – Microtubules – Mitosis


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