Mechanisms Regulating Synaptonemal Complex Disassembly in C. elegans Meiosis

斯莫里科夫摘要MCB-1121150智力价值：减数分裂是有性繁殖所需的基本生物学过程，也是遗传变异的主要贡献者。减数分裂的一个关键步骤是在第一次减数分裂过程中分离母本和父本(同源)染色体。这一步骤的准确执行需要同源染色体之间的遗传信息交换，从而导致交叉形成。联会复合体(Synaptonemal Complex，SC)是一个关键结构，位于减数分裂活动的中心。SC被组装在每一对同源染色体之间，以确保所有必需的交叉事件的形成，之后SC以调节的方式被分解。在没有SC的情况下，染色体在第一次减数分裂中错误分离，通常会导致胚胎死亡。在过去的几年里，人们对SC组装的了解有了很大的进步，但对SC分解机制的了解却进展甚微。斯莫里科夫博士的研究旨在阐明SC分解的机制。为了做到这一点，她利用了模式生物秀丽线虫的众多遗传、细胞学和分子工具。她已经确定了一种特殊需要SC分解的基因，但该基因不参与早期减数分裂事件，如交叉形成或SC组装。通过对突变基因的两个等位基因进行分子和细胞学鉴定，以及通过RNAi使其mRNA缺失，她剖析了SC分解所需的分子途径。此外，通过使用她的突变体进行基因筛选，她正在帮助揭示调控SC分解的途径。总而言之，这项研究将有助于更好地理解SC拆解及其在适当的减数分裂染色体分离中的作用。更广泛的影响：该项目将为爱荷华大学和当地大学的本科生和研究生提供研究机会，以及为研究生提供博士论文项目。该项目将为研究生课程材料和课程开发做出贡献，包括一门遗传学实验室课程，该课程以线虫实验为特色，侧重于减数分裂，它将成为一个机会，介绍具有强大遗传系统的适当模式生物的基本遗传概念。学生将接受尖端研究技术方面的培训。

Smolikove ABSTRACT MCB-1121150 Intellectual merit:Meiosis is a fundamental biological process required for sexual reproduction, and is a major contributor to genetic variability. A crucial step in meiosis is the segregation of maternal and paternal (homologous) chromosomes during the first meiotic division. The accurate execution of this step requires the exchange of genetic information between homologous chromosomes leading to crossover formation. The synaptonemal complex (SC) is a key structure, placed in the center of events unfolding in meiosis. The SC is assembled between each pair of homologous chromosomes to ensure the formation of all obligatory crossover events, after which the SC is disassembled in a regulated fashion. In the absence of the SC, chromosomes missegregate in the first meiotic division, often leading to embryonic lethality. The understanding of SC assembly has greatly advanced in the past years, but little progress has been made in understanding the mechanisms of SC disassembly. Dr.Smolikove's research is aimed at elucidating the mechanisms of SC disassembly. To do so, she takes advantage of the numerous genetic, cytological, and molecular tools available in the model organism Caenorhabditis elegans. She has identified a gene which is specifically required for SC disassembly but which does not participate in early meiotic events such as crossover formation or SC assembly. Through molecular and cytological characterization of two alleles of the mutated gene, along with depletion of its mRNA via RNAi, she dissects the molecular pathways required for SC disassembly. Furthermore, performing genetic screens using her mutants, she is helping to reveal the pathway regulating SC disassembly. Over all, this research will lead to a better understanding of SC disassembly and its role in proper meiotic chromosome segregation. Broader Impacts:This project will provide research opportunities for undergraduates and graduate students from the University of Iowa and from local colleges, along with Ph.D. thesis projects for graduate students. The project will contribute to graduate course material and curriculum development, including a genetics lab course that features experiments using C. elegans and focusing on meiosis, It will serve as an opportunity to introduce basic genetic concepts in an appropriate model organism with a powerful genetic system. Students will be trained in cutting-edge research techniques.