Transcriptome regulation during mitosis

项目摘要 在有丝分裂和减数分裂过程中准确的染色体分离对于存活率和细胞分裂是至关重要的。 发展染色体分离错误导致非整倍体，这与 得了癌症为了保证染色体的准确分离， 必须在进入有丝分裂时急剧浓缩和个体化。准确 有丝分裂过程中染色体的分布依赖于重复姐妹的相互作用 染色单体与有丝分裂纺锤体的微管。每条染色体包含一个 作为动粒形成部位的着丝粒。核膜处 分解，对动粒：微管（K：MT）附着和信号传导重要的蛋白质 监测K：MT附着的分子被募集到动粒。成功 细胞分裂的完成需要着丝粒/动粒的协调调节 装配，动粒：微管附着和染色体凝聚。 几十年的工作已经确定了数百种蛋白质，这些蛋白质调节着细胞的各个方面。 分裂。然而，对有丝分裂过程中转录组的调控知之甚少。 最近的研究表明，转录组的重塑在转录调控中起着重要作用。 有丝分裂调节这项计划将研究转录组重塑的两个基本方面 在有丝分裂期间。首先，在有丝分裂期间，大部分核转录被阻断，然而， 着丝粒逃避转录下调。令人惊讶的是，人们对它知之甚少。 有丝分裂过程中转录抑制的机制或有丝分裂转录抑制的破坏 抑制影响染色体分离的保真度。目前还不清楚， 有丝分裂转录抑制有助于改变基因表达模式。第二、 在分裂间期，成百上千的RNA被保留在细胞核中， 染色质和调节核组织和基因表达。在有丝分裂过程中， 核RNA从染色质中释放出来，但对RNA的机制知之甚少。 在有丝分裂过程中从染色质中去除。此外，目前还不清楚RNA的破坏是如何发生的。 从染色质释放影响染色体分离或基因表达的过程 有丝分裂后。我们的工作将研究转录组在有丝分裂过程中是如何重塑的 以及这如何有助于染色体的精确分离。

Project Summary Accurate chromosome segregation during mitosis and meiosis is critical for viability and development. Errors in chromosome segregation lead to aneuploidy, which is closely correlated with cancer. In order to ensure accurate chromosome segregation duplicated sister chromatids must be dramatically condensed and individualized upon entry into mitosis. Accurate chromosome distribution during mitosis depends on the interaction of duplicated sister chromatids with the microtubules of the mitotic spindle. Each chromosome contains one centromere that serves as the site for the formation of the kinetochore. At nuclear envelope breakdown, proteins important for kinetochore:microtubule (K:MT) attachment and signaling molecules that monitor K:MT attachment are recruited to the kinetochore. Successful completion of cell division requires the coordinated regulation of centromere/kinetochore assembly, kinetochore:microtubule attachment and chromosome condensation. Decades of work have identified hundreds of proteins that regulate various aspects of mitosis. However, very little is known about regulation of the transcriptome during mitosis. Recent work has demonstrated that remodeling of the transcriptome plays an important role in mitotic regulation. This proposal will study two fundamental aspects of transcriptome remodeling during mitosis. First, during mitosis, the majority of nuclear transcription is blocked, however, centromeres escape transcriptional down-regulation. Surprisingly, very little is known about the mechanism of transcriptional inhibition during mitosis or how disruption of mitotic transcriptional inhibition impacts the fidelity of chromosome segregation. It is also unknown if the process of mitotic transcriptional inhibition contributes to changing gene expression patterns. Second, during interphase hundreds to thousands of RNAs are retained in the nucleus where they bind to chromatin and regulate nuclear organization and gene expression. During mitosis many nuclear RNAs are released from chromatin, yet little is known about the mechanism of RNA removal from chromatin during mitosis. Additionally, it is unknown how disruption of RNA release from chromatin impacts the process of chromosome segregation or gene expression following mitosis. Our work will investigate how the transcriptome is remodeled during mitosis and how this contributes to accurate chromosome segregation.