HIGH RESOLUTION EPIGENOMIC MAPS OF YEAST IN RESPONSE TO ENVIRONMENTAL STRESS

基因调控是所有生命的核心，无论是正常的还是患病的。该研究项目的长期目标是： 在单个bp分辨率下理解在囊上组装的蛋白质的分子组织（架构）， charomyces（芽殖酵母）基因组。芽殖酵母是一种理想的模型细胞系统，因为它的结构简单， 基因组，遗传操作的容易性，以及转录和染色质调节因子与人类的保守性。 细胞通过了解表观基因组的精确分子结构，我们可以获得基因组的整体视图 调控机制该项目将建立在我们公布的一组全基因组ChIP-exo数据的基础上， 精确测量由400多种不同蛋白质组成的酵母表观基因组。此次扩张将在- 涉及了解表观基因组如何被环境信号重新编程。两大类的再- 将检查编程：急性应激反应（例如，热休克和氧化应激）和长期 发育途径的展开（例如，饥饿反应）引起的慢性应激。Responses to 急性应激揭示了细胞中预先存在的分子结构，然后在几分钟内重新组织 感知细胞外信号的能力。这些事件通常是短暂的，因此必须在到达 他们的时间极限相比之下，发育途径在酵母中展开数小时，通常依赖于 基因特异性转录因子的从头合成。该项目将绘制精确的位置组织图- 反应于热休克和氧化应激的数百种表观基因组成分的作用，以及较小的一组表观基因组成分的作用。 在应对更广泛的急性压力和发展途径的组成部分。这个项目 还将定义表观基因组因素的功能相互依赖性，特别关注基因在- 诱导辅因子Mediator和佐贺。诱导转录的相关成分将迅速耗尽， 然后检测它们对介体和佐贺与启动子结合的影响。其他相互依存关系，知情 还将检查将在重编程/诱导期间定义的表观基因组的组织。 这些目标将有助于更全面地了解基因调控的蛋白质结构。 这一新的基因-环境相互作用的计算预测应该是可行的。

Gene regulation is central to all life, normal and diseased. The long-term goal of this research project is to un- derstand at single bp resolution the molecular organization (architecture) of proteins assembled on the Sac- charomyces (budding yeast) genome. Budding yeast represent an ideal model cellular system due to its simple genome, ease of genetic manipulation, and conservation of transcription and chromatin regulators with human cells. By understanding the precise molecular architecture of epigenomes, we gain a holistic view of genome regulation mechanisms. This project will build on our published set of genome-wide ChIP-exo data that com- prehensively measures the yeast epigenome consisting of over 400 distinct proteins. This expansion will in- volve understanding how epigenomes are reprogrammed by environmental signals. Two broad classes of re- programming will be examined: acute stress responses (e.g., heat shock and oxidative stress) and long-term unfolding of developmental pathways (e.g., starvation responses) brought on by chronic stress. Responses to acute stress reveal molecular architectures that pre-exist in the cell and then re-organize within a few minutes of sensing extracellular signaling. These events are typically transient and so must be captured upon reaching their temporal maxima. In contrast, developmental pathways unfold over hours in yeast and typically rely on de novo synthesis of gene-specific transcription factors. This project will map the precise positional organiza- tion of hundreds of epigenomic components in response to heat shock and oxidative stress, and smaller set of components in response to a much broader array of acute stresses and developmental pathways. This project will also define the functional interdependencies of epigenomic factors, with particular focus on the gene in- duction cofactors Mediator and SAGA. Relevant components of induced transcription will be rapidly depleted, then their impact on Mediator and SAGA binding to promoters examined. Other interdependencies, informed by the organization of epigenomes that will be defined during reprogramming/induction will also be examined. Together these aims will help provide a more thorough understanding of the protein architecture of gene regu- lation that should allow computational prediction of novel gene-environment interactions in diseased tissue.