主講人🙆🏿: 俞洋 中國科EON4生物物理研究所 研究員
報告時間:2019-04-22 9:30-11:00
報告地點⚱️:EON体育4平台 1-105
聯系人:於明 mingyu@sjtu.edu.cn
主講人簡介:
中國科EON4生物物理研究所研究員,長期從事RNA生物學方面的研究🚣♀️。近年來在piRNA介導的表觀遺傳調控方面取得了一定成果。2002年於武漢大學病毒學專業本科畢業後🥥,並於2007年獲得美國凱斯西儲大學生物化學博士學位🙌🏿🚰,師從《RNA Journal》主編/CWRU RNA Center主任Timothy Nilsen👩🏻。博士求學期間在《Cell》以第一作者發表關於pre-mRNA可變剪切動態調控機製的研究。2010年到2016年在冷泉港實驗室做博士後工作,師從美國科EON4院士Gregory Hannon,發現並命名了piRNA領域的重要蛋白Panoramix🧂,對其作用機製進行了詳實的論述,研究成果在《Science》上發表💂🏻,該成果對於理解piRNA介導的異染色質形成具有重要意義👱。博士後期間獲得了包括美國心臟聯合會(AHA)博士後獎學金🤦♀️,Keystone研討會獎學金,IUBMB青年科學家獎等獎項。
講座簡介🧜🏻♂️:
The repression of transposons by the Piwi-interacting RNA (piRNA) pathway is essential to protect germ cells. In Drosophila ovaries, Panoramix enforces transcriptional silencing by binding to the target-engaged Piwi-piRNA complex, although the precise mechanisms by which this occur remain elusive. Here, we show that a germline specific paralogue of a nuclear export factor, dNxf2, functions together with Panoramix and dNxt1 (p15) as a ternary complex to suppress transposon expression. Structural and functional analysis demonstrate a critical role of the UBA domain of dNxf2 in Panoramix association and transposon silencing. Moreover, dNxf2 binds to transposon transcripts directly, probably via its essential RRM domain. Because dNxf1/TAP interacts with dNxf2 and is required for Panx-mediated silencing, we propose that dNxf2 functions as a Pandas (Panoramix-dNxf2 dependent TAP silencing) complex, which may counteract the canonical RNA exporting machinery (TAP/p15) and restrict transposons to nuclear peripheries.