Evolution and divergence of TBP-mediated transcription activation mechanisms

TBP介导的转录激活机制的进化和分歧

• 批准号: RGPIN-2020-06106
• 负责人: Teves, Sheila
• 金额: $ 2.99万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=744280
• 关键词: Evolution; divergence; TBP; mediated; transcription

A fundamental process in all living organisms is the flow of genetic information from DNA to RNA, known as transcription, which is mediated by the RNA polymerase enzyme. In eukaryotic organisms where the nucleus is enclosed by a membrane, there are three polymerases (Pol I, II, III) that transcribe different genes. The TATA-binding protein (TBP) which is a transcription factor (TF) found across all eukaryotic species, is required for the initiation of transcription by each of the three RNA Pols. Despite its conserved properties, TBP contains an N-terminal domain that has diversified in length and composition throughout evolution, hinting at a potential role in diversifying transcription mechanisms across eukaryotic species. The long-term goal of my Discovery research program is to understand how the highly conserved transcription process has evolved and diversified across Eukarya. Towards this goal, my five-year objectives are to: 1) examine the evolutionary role of the N-terminal domain of TBP in yeast and mammalian cells; 2) establish the molecular role of TBP N-terminal domain as it relates to transcription by the three RNA Pols; and 3) Determine the functional roles of vertebrate-specific TBP-related factors. My previous work on transcription factors highlights my expertise in the diverse technologies that I propose to use in my Discovery research program. For over two decades, scientists observed that TFs, key regulators of transcription, become excluded from chromosomes during mitosis, raising the question of how transcription is reactivated after mitosis. However, using gene editing, genomics, and live-cell imaging, I discovered that the observed TF exclusion was an artifact of chemical crosslinking, which was central to previously used techniques. My discovery led to a paradigm shift in our understanding of how transcription is restarted after mitosis, highlighting the powerful combination of gene editing, genomics, and single-molecule live-cell imaging to make unprecedented discoveries in basic biology. For my Discovery research program, I will use this previous experience and expertise to study the evolutionary influences that have shaped eukaryotic transcription. This research will help train Masters and PhD graduate students in emerging and interdisciplinary technologies, and support a lab environment where undergraduates can learn and perform independent study projects. I am committed to promoting an equitable training environment for underrepresented groups as described in the University of British Columbia's Equity and Diversity Strategic Plan. Because transcription is central to all life, the results of the proposed studies will have a major impact on advancing knowledge in diverse areas of natural sciences and genetic engineering. Knowledge gained from this basic biological research will have broader implications in the field of evolution and molecular biology, and will inform future basic research.

所有生物体中的一个基本过程是遗传信息从DNA到RNA的流动，称为转录，其由RNA聚合酶介导。在细胞核被膜包围的真核生物中，有三种聚合酶（Pol I，II，III）转录不同的基因。TATA结合蛋白（TBP）是一种存在于所有真核生物中的转录因子（TF），是三种RNA聚合物中每一种启动转录所必需的。尽管其保守的性质，TBP包含一个N-末端结构域，在整个进化过程中，其长度和组成多样化，暗示了在真核生物物种中多样化转录机制的潜在作用。我的发现研究计划的长期目标是了解高度保守的转录过程如何在真核生物中进化和多样化。为了实现这一目标，我的五年目标是：1）研究TBP N-末端结构域在酵母和哺乳动物细胞中的进化作用; 2）建立TBP N-末端结构域的分子作用，因为它与三种RNA聚合物的转录有关; 3）确定脊椎动物特异性TBP相关因子的功能作用。 我以前在转录因子方面的工作突出了我在不同技术方面的专业知识，我建议在我的发现研究计划中使用这些技术。二十多年来，科学家们观察到转录的关键调控因子TF在有丝分裂期间被排除在染色体之外，这提出了有丝分裂后转录如何重新激活的问题。然而，使用基因编辑、基因组学和活细胞成像，我发现观察到的TF排除是化学交联的人为现象，这是之前使用的技术的核心。我的发现导致了我们对有丝分裂后转录如何重新启动的理解的范式转变，突出了基因编辑，基因组学和单分子活细胞成像的强大组合，在基础生物学中取得了前所未有的发现。对于我的探索研究计划，我将利用这些经验和专业知识来研究形成真核转录的进化影响。 这项研究将有助于培养硕士和博士研究生在新兴和跨学科技术，并支持实验室环境，本科生可以学习和执行独立的研究项目。我致力于促进一个公平的培训环境中所描述的代表性不足的群体在不列颠哥伦比亚省的公平和多样性战略计划的大学。 由于转录是所有生命的核心，因此拟议研究的结果将对推进自然科学和遗传工程各个领域的知识产生重大影响。从这一基础生物学研究中获得的知识将在进化和分子生物学领域产生更广泛的影响，并将为未来的基础研究提供信息。