Wolbachia Utilizes Host Microtubules and Dynein for Anterior Localization in the Drosophila Oocyte

PLoS Pathogens

William Sullivan¹  Jian Cao¹  Patrick M Ferree¹  Horacio M Frydman²  Jennifer M Li²  Eric Wieschaus² 

[1] Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Cruz, California, United States of America;Howard Hughes Medical Institute, Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America

关键词: Oocytes;    Wolbachia;    Microtubules;    Dyneins;    Drosophila melanogaster;    Cytoplasm;    Germ cells;    Mitochondria;   

DOI  :  10.1371/journal.ppat.0010014

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

To investigate the role of the host cytoskeleton in the maternal transmission of the endoparasitic bacteria Wolbachia, we have characterized their distribution in the female germ line of Drosophila melanogaster. In the germarium, Wolbachia are distributed to all germ cells of the cyst, establishing an early infection in the cell destined to become the oocyte. During mid-oogenesis, Wolbachia exhibit a distinct concentration between the anterior cortex and the nucleus in the oocyte, where many bacteria appear to contact the nuclear envelope. Following programmed rearrangement of the microtubule network, Wolbachia dissociate from this anterior position and become dispersed throughout the oocyte. This localization pattern is distinct from mitochondria and all known axis determinants. Manipulation of microtubules and cytoplasmic Dynein and Dynactin, but not Kinesin-1, disrupts anterior bacterial localization in the oocyte. In live egg chambers, Wolbachia exhibit movement in nurse cells but not in the oocyte, suggesting that the bacteria are anchored by host factors. In addition, we identify mid-oogenesis as a period in the life cycle of Wolbachia in which bacterial replication occurs. Total bacterial counts show that Wolbachia increase at a significantly higher rate in the oocyte than in the average nurse cell, and that normal Wolbachia levels in the oocyte depend on microtubules. These findings demonstrate that Wolbachia utilize the host microtubule network and associated proteins for their subcellular localization in the Drosophila oocyte. These interactions may also play a role in bacterial motility and replication, ultimately leading to the bacteria's efficient maternal transmission.

【 授权许可】

CC BY