报告题目:从DNA物理特性看核小体的定位与滑动
报告时间:7月7日 上午10:00
报告地点:计算机楼A521报告厅
报告人:刘国庆教授,内蒙古科技大学
报告人简介:
内蒙古科技大学教授,硕士研究生导师。内蒙古自治区“草原英才”培养人选,内蒙古高校“青年科技英才支持计划”科技骨干,获2014年度内蒙古自然科学奖一等奖。主持国家自然科学基金2项、省部级项目3项,发表SCI论文20余篇,出版专著1部,参编教材2部。
2009年获得内蒙古老员工物物理学专业博士学位,同年到内蒙古科技大学工作至今。从事表观遗传学领域的生物信息学研究,主要研究:(1)细胞减数分裂过程中染色体联会和交换的分子机理和调控网络,以及基因组在重组作用下的进化规律;(2)原核、真核基因组包装机理;(3)癌症的发生与发展机理。主讲课程:生物信息学、生物物理学、基因组学、理论力学等。
报告摘要:
Nucleosome plays a crucial role in chromatin structure-involved cellular processes, such as DNA replication, recombination, and transcription. Here, we investigated the role of DNA deformation energy in nucleosome positioning and sliding. The results show that (1) deformation energy is a good physical index to predict nucleosome dyad positions, occupancy and the free energy in the process of nucleosome reconstitution in vitro; (2) there are at least 20% of the nucleosomes in budding yeast do not adopt canonical positioning, in which underlying sequences wrapped around histones are structurally symmetric; (3) different chromatin regions, such well-positioned nucleosomes, fuzzy nucleosomes and linker regions have distinct bending energy profiles; (4) both accessibility and directionality of nucleosome sliding is likely to be modulated by diverse patterns of DNA bending energy profile.
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菠菜导航网计算机科学技术研究所
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