Transcription mechanism of Myrf for central nervous system myelination

Myrf对中枢神经系统髓鞘形成的转录机制

• 批准号: 9294191
• 负责人: YUNGKI PARK
• 金额: $ 38.55万
• 依托单位: STATE UNIVERSITY OF NEW YORK AT BUFFALO
• 依托单位国家: 美国
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-15 至 2020-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9294191
• 关键词: Adult; Applications Grants; Binding; Biogenesis; Bioinformatics; Biological Assay; Cell Line; Cell Nucleus; ChIP-seq; Cleaved cell; Collaborations; Computer Analysis; Cues; DNA; Data; Development; Endoplasmic Reticulum; Genetic Transcription; Genetic study; Homo; Immunofluorescence Immunologic; Immunoprecipitation; Impairment; In Vitro; Investigation; Laboratories; Learning; Life; Link; Luciferases; Maintenance; Mass Spectrum Analysis; Mediating; Membrane; Membrane Proteins; Modeling; Molecular; Molecular Chaperones; Mus; Mutagenesis; Myelin; N-terminal; Names; Nature; Neuraxis; Oligodendroglia; Phenotype; Proteolysis; Publishing; Regulation; Role; Small Interfering RNA; Specificity; Stimulus; Sum; Tertiary Protein Structure; Thick; Transcriptional Regulation; Western Blotting; Work; chromatin protein; combinatorial; experimental analysis; experimental study; myelination; nervous system disorder; neuropsychiatric disorder; notch protein; novel; protein complex; public health relevance; transcription factor

 DESCRIPTION (provided by applicant): Myelination of the central nervous system (CNS) by oligodendrocytes (OLs) is essential for the development and function of the CNS. Myelin develops in the CNS as OLs differentiate into the myelin-forming mature phenotype. The differentiation of OLs is under tight regulation, and its dysregulation causes neurological disorders and has been linked to neuropsychiatric diseases. Genetic studies have shown that Myrf is a key transcription factor for the development and life-long maintenance of myelin in the CNS. Recent studies have also demonstrated that Myrf is critical to the fine-tuning of myelin thickness and its plasticity that underlies learning in the adult stage. Despite these crucial role, it remains poorly understood how Myrf regulates transcription, and this significantly impedes the progress in this field. Using bioinformatics and experimental approaches, we recently made the breakthrough observations that Myrf is a membrane-bound transcription factor, and that Myrf may function as a homo-trimeric transcription factor. Membrane-bound transcription factors are generated as membrane proteins that, upon relevant stimuli, undergo proteolytic activation to release transcription factor domains from the membrane, with Notch being the most famous example. Our discovery fundamentally changes the paradigm for Myrf, providing a powerful framework to understand its functional mechanism. Building upon this discovery, Aim I will elucidate how Myrf is activated by proteolysis. The proteolytic activation of Myrf releases its N-terminal fragment from the membrane, allowing it to translocate into the nucleus for transcriptional regulation. Aim II will determine how the N-terminal fragment of Myrf interacts with DNA as a homo-trimer for transcription. Our computational and experimental analyses indicate that functional collaboration with other transcription factors is critical to the transcriptional activity of Myrf. Aim III will elucidate which transcription factors interact with yrf for coordinated differentiation of OLs. In sum, this study will elucidate the transcription mechanism of Myrf for OL differentiation and CNS myelination.

 描述（通过应用程序提供）：少突胶质细胞（OLS）对中枢神经系统（CNS）的髓鞘化对于CNS的发展和功能至关重要。当OLS分化为形成髓磷脂的成熟表型时，髓磷脂在中枢神经系统中发育。 OLS的分化受到严格的调节，其失调会引起神经系统疾病，并与神经精神疾病有关。遗传研究表明，MYRF是中枢神经系统中髓磷脂的发育和终身维持的关键转录因子。最近的研究还表明，MYRF对于髓磷脂厚度及其可塑性的微调至关重要，其可塑性是成人阶段学习的基础。尽管这些至关重要的作用，但仍然很少了解MYRF如何调节转录，这显着阻碍了该领域的进步。使用生物信息学和实验方法，我们最近对MYRF是膜结合的转录因子进行了突破性的观察，并且MYRF可能起着同型三种转录因子的作用。膜结合的转录因子作为膜蛋白产生，在相关刺激下，经历蛋白水解激活以从膜上释放转录因子域，而Notch是最著名的例子。我们的发现从根本上改变了MYRF的范式，为了解其功能机制提供了有力的框架。在这一发现的基础上，目标我将阐明如何通过蛋白水解激活MYRF。 MYRF的蛋白水解激活从膜上释放出其N末端片段，从而使其可以转移到核进行转录调控中。 AIM II将确定MYRF的N末端片段如何与DNA相互作用，作为转录的同型转录器。我们的计算和实验分析表明，与其他转录因子的功能合作对MYRF的转录活性至关重要。 AIM III将阐明哪些转录因子与YRF相互作用，以协调OLS的分化。总而言之，这项研究将阐明MYRF的转录机制用于OL分化和CNS髓鞘化。