---
_id: '13229'
abstract:
- lang: eng
text: Dynamic reorganization of the cytoplasm is key to many core cellular processes,
such as cell division, cell migration, and cell polarization. Cytoskeletal rearrangements
are thought to constitute the main drivers of cytoplasmic flows and reorganization.
In contrast, remarkably little is known about how dynamic changes in size and
shape of cell organelles affect cytoplasmic organization. Here, we show that within
the maturing zebrafish oocyte, the surface localization of exocytosis-competent
cortical granules (Cgs) upon germinal vesicle breakdown (GVBD) is achieved by
the combined activities of yolk granule (Yg) fusion and microtubule aster formation
and translocation. We find that Cgs are moved towards the oocyte surface through
radially outward cytoplasmic flows induced by Ygs fusing and compacting towards
the oocyte center in response to GVBD. We further show that vesicles decorated
with the small Rab GTPase Rab11, a master regulator of vesicular trafficking and
exocytosis, accumulate together with Cgs at the oocyte surface. This accumulation
is achieved by Rab11-positive vesicles being transported by acentrosomal microtubule
asters, the formation of which is induced by the release of CyclinB/Cdk1 upon
GVBD, and which display a net movement towards the oocyte surface by preferentially
binding to the oocyte actin cortex. We finally demonstrate that the decoration
of Cgs by Rab11 at the oocyte surface is needed for Cg exocytosis and subsequent
chorion elevation, a process central in egg activation. Collectively, these findings
unravel a yet unrecognized role of organelle fusion, functioning together with
cytoskeletal rearrangements, in orchestrating cytoplasmic organization during
oocyte maturation.
acknowledgement: This work was supported by funding from the European Union (European
Research Council Advanced grant 742573) to C.-P.H. The funders had no role in study
design, data collection and analysis, decision to publish, or preparation of the
manuscript.
article_processing_charge: No
article_type: original
author:
- first_name: Shayan
full_name: Shamipour, Shayan
id: 40B34FE2-F248-11E8-B48F-1D18A9856A87
last_name: Shamipour
- first_name: Laura
full_name: Hofmann, Laura
id: b88d43f2-dc74-11ea-a0a7-e41b7912e031
last_name: Hofmann
- first_name: Irene
full_name: Steccari, Irene
id: 2705C766-9FE2-11EA-B224-C6773DDC885E
last_name: Steccari
- first_name: Roland
full_name: Kardos, Roland
id: 4039350E-F248-11E8-B48F-1D18A9856A87
last_name: Kardos
- first_name: Carl-Philipp J
full_name: Heisenberg, Carl-Philipp J
id: 39427864-F248-11E8-B48F-1D18A9856A87
last_name: Heisenberg
orcid: 0000-0002-0912-4566
citation:
ama: Shamipour S, Hofmann L, Steccari I, Kardos R, Heisenberg C-PJ. Yolk granule
fusion and microtubule aster formation regulate cortical granule translocation
and exocytosis in zebrafish oocytes. PLoS Biology. 2023;21(6):e3002146.
doi:10.1371/journal.pbio.3002146
apa: Shamipour, S., Hofmann, L., Steccari, I., Kardos, R., & Heisenberg, C.-P.
J. (2023). Yolk granule fusion and microtubule aster formation regulate cortical
granule translocation and exocytosis in zebrafish oocytes. PLoS Biology.
Public Library of Science. https://doi.org/10.1371/journal.pbio.3002146
chicago: Shamipour, Shayan, Laura Hofmann, Irene Steccari, Roland Kardos, and Carl-Philipp
J Heisenberg. “Yolk Granule Fusion and Microtubule Aster Formation Regulate Cortical
Granule Translocation and Exocytosis in Zebrafish Oocytes.” PLoS Biology.
Public Library of Science, 2023. https://doi.org/10.1371/journal.pbio.3002146.
ieee: S. Shamipour, L. Hofmann, I. Steccari, R. Kardos, and C.-P. J. Heisenberg,
“Yolk granule fusion and microtubule aster formation regulate cortical granule
translocation and exocytosis in zebrafish oocytes,” PLoS Biology, vol.
21, no. 6. Public Library of Science, p. e3002146, 2023.
ista: Shamipour S, Hofmann L, Steccari I, Kardos R, Heisenberg C-PJ. 2023. Yolk
granule fusion and microtubule aster formation regulate cortical granule translocation
and exocytosis in zebrafish oocytes. PLoS Biology. 21(6), e3002146.
mla: Shamipour, Shayan, et al. “Yolk Granule Fusion and Microtubule Aster Formation
Regulate Cortical Granule Translocation and Exocytosis in Zebrafish Oocytes.”
PLoS Biology, vol. 21, no. 6, Public Library of Science, 2023, p. e3002146,
doi:10.1371/journal.pbio.3002146.
short: S. Shamipour, L. Hofmann, I. Steccari, R. Kardos, C.-P.J. Heisenberg, PLoS
Biology 21 (2023) e3002146.
date_created: 2023-07-16T22:01:09Z
date_published: 2023-06-08T00:00:00Z
date_updated: 2023-08-02T06:33:14Z
day: '08'
ddc:
- '570'
department:
- _id: CaHe
doi: 10.1371/journal.pbio.3002146
ec_funded: 1
external_id:
isi:
- '001003199100005'
pmid:
- '37289834'
file:
- access_level: open_access
checksum: 8e88cb0e5a6433a2f1939a9030bed384
content_type: application/pdf
creator: dernst
date_created: 2023-07-18T07:59:58Z
date_updated: 2023-07-18T07:59:58Z
file_id: '13246'
file_name: 2023_PloSBiology_Shamipour.pdf
file_size: 4431723
relation: main_file
success: 1
file_date_updated: 2023-07-18T07:59:58Z
has_accepted_license: '1'
intvolume: ' 21'
isi: 1
issue: '6'
language:
- iso: eng
month: '06'
oa: 1
oa_version: Published Version
page: e3002146
pmid: 1
project:
- _id: 260F1432-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '742573'
name: Interaction and feedback between cell mechanics and fate specification in
vertebrate gastrulation
publication: PLoS Biology
publication_identifier:
eissn:
- 1545-7885
publication_status: published
publisher: Public Library of Science
quality_controlled: '1'
scopus_import: '1'
status: public
title: Yolk granule fusion and microtubule aster formation regulate cortical granule
translocation and exocytosis in zebrafish oocytes
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 21
year: '2023'
...