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CSB Seminar – Professor Ronen Zaidel-Bar, Sackler Faculty of Medicine, Tel Aviv University

December 1 @ 2:00 pm - 3:00 pm

CSB Seminar

Professor Ronen Zaidel-Bar
Dept. of Cell and Developmental Biology
Sackler Faculty of Medicine
Tel Aviv University

Good contractions: Actomyosin regulation in the C. elegans gonad” 

Friday, December 1, 2017
2:00-3:00 p.m. at RW 432
Host: Rodrigo Fernandez-Gonzalez
Abstract:

Distinct actomyosin structures power a variety of cellular and multicellular processes requiring force. Yet, how actomyosin is regulated in vivo is still poorly understood. We are addressing this question in the model organism C. elegans, and in my talk, I will discuss actomyosin structures related to two parts of its reproductive system: the syncytial germline and the spermatheca.
Syncytial architecture is an evolutionary-conserved feature of the germline across species, which plays a crucial role in organism fertility. Our results uncover a novel role for actomyosin contractility in maintaining the architecture of the syncytial germline, and implicate the formin CYK-1 and actin cross-linking protein PLST-1 in its regulation.
The spermatheca, a pouch-like myoepithelial tissue, is the site of oocyte ovulation and fertilization, and its contractility is required for transit of the fertilized egg into the uterus. Oocyte entry into the spermatheca triggers its contraction through calcium signalling and the RHO-1-ROCK pathway. We discovered the RhoGAP and GEFs that activates RHO-1 in the spermatheca and found that they are responsive to stretching of the spermatheca by incoming oocytes, thus elucidating a mechanotransduction feedback loop that guarantees the right amount and timing of actomyosin contractility. In summary, our work on C. elegans reproduction is revealing novel mechanisms of molecular control over actomyosin contractility in vivo.

Details

Date:
December 1
Time:
2:00 pm - 3:00 pm

Venue

Ramsay Wright Building, Room 432
25 Harbord St.
Toronto, ON M5S 3G5 Canada

Organizer

University of Toronto, Cell & Systems Biology