南方科技大学 EN

主讲人: François Schweisguth 院士

时间: 2025年12月12日(周五)下午16:20-17:30

地点: 琳恩图书馆110报告厅

第118期杰出学人大讲堂:Self-organization in pattern formation by Notch in Drosophila

题 目:Self-organization in pattern formation by Notch in Drosophila

主 讲:François Schweisguth 院士

时 间:2025年12月12日(周五)下午16:20-17:30

地 点:琳恩图书馆110报告厅


个人简介:

Head, 4D unit, 法国巴斯德研究所,CNRS Research Director,欧洲科学院院士,H-index 45,PLoS Biology 学术主编。Francois Schweisguth于1983-1988年就读于巴黎高等师范学院(École Normale Supérieure),1990年在Jean-Antoine Lepesant(巴黎IJM)和Alain Vincent(图卢兹CBD)的共同指导下获得发育生物学博士学位。1990-1993年期间,他作为HFSP博士后,在加州大学圣地亚哥分校(University of California San Diego)的J. W. Posakony教授实验室工作。他于1992年加入法国国家科学研究中心(CNRS),1996-2008年在巴黎高等师范学院担任CNRS ATIPE独立课题组负责人,随后于2008年加入巴斯德研究所(Institut Pasteur)主持一个研究单元。他于2006年获CNRS银质奖章(CNRS Silver Medal),2012年当选为EMBO成员。他目前担任CNRS研究主任(CNRS Research Director)一职。他的研究主要以果蝇(Drosophila)为模型系统,重点聚焦于Notch信号的细胞生物学、上皮形态发生(epithelial morphogenesis)的调控,以及自组织(self-organization)在发育图式(developmental patterns)形成中的作用。其中,他最先发现了Notch通路下游中命运决定分子Suppressor of Hairless (Su(H))的不对称分布以及Numb/Neuralized导致的Notch通路的不对称激活,是写入教科书的发现,也是每个Notch通路图里面必会出现的关键调节因子。

 

 

报告摘要:

Pattern formation often involves self-organization guided by positional information. In most tissues, however, the dynamics of patterning, and therefore the underlying logic, remains unknown. Revisiting the textbook model of lateral inhibition, I will first discuss how self-organized Notch signaling can act in a continuous manner to pattern proneural stripes and single out neural cells at the tissue scale in the dorsal thorax. Extending this view to the developing eye, I will describe how rows of light-receiving units emerge in the wake of a traveling differentiation front to form a crystal-like array. In this context, live imaging of the proneural factor Atonal reveals unanticipated oscillations of gene expression at the front. This oscillatory dynamics is produced by the successive activation of two distinct enhancers and is associated with pulsatile Notch signaling. This observation is inconsistent with current models of eye patterning whereby each row of differentiating cells provides a negative template for the next. I will discuss a new relay model in which transient Notch signaling from differentiating cells provides a positive templating signal that conveys both temporal and spatial information to propagate oscillatory dynamics and crystal-like order.


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