Histone Acetylation Dynamics and Epigenome Duplication

真核生物基因组存在于一个复杂的和动态的三维结构，提供了重要的调控 控制基因表达程序的信息，这些程序对维持细胞身份至关重要。基因组 结构对于在细胞核中包装基因组和保持基因组稳定性也是至关重要的。基因组 结构主要由其与组蛋白结合形成染色质决定。邮报- 组蛋白上的翻译修饰在决定基因组结构方面起着关键作用，因为它们调节基因组的结构。 非组蛋白与基因组DNA的关联。真核生物面临的一个重要挑战是 组蛋白修饰模式的表观遗传，该模式控制DNA后的基因组结构 复制和细胞分裂。该提案旨在确定监管的基本机制 组蛋白修饰模式的表观遗传。 在复制叉通过后，新复制的DNA被包装到含有1：1 DNA的染色质中。 亲本组蛋白和新合成的组蛋白的混合物。修改模式的保留 亲本组蛋白为特定染色质状态的复制提供空间记忆。的关键步骤 表观遗传是亲本修饰模式转移到邻近的新组蛋白。 我们的工作是基于这样的假设，即新的组蛋白在表观遗传中起着关键的调节作用， 染色质状态的遗传。目前的提议是基于我的实验室对以前未知的物质的鉴定 新合成的组蛋白的动态乙酰化与特异性的表观遗传之间的联系 染色质状态和DNA复制后三维基因组结构的恢复。的 这里提出的实验将表征新的组蛋白乙酰化对结构的影响， 染色质的组成，并确定与新的组蛋白乙酰化， 调节染色质状态的表观遗传。此外，我们将描述一个以前 新组蛋白乙酰化在三维基因组表观遗传中的作用 通过调节染色质和核纤层之间的相互作用来调节核结构。

Eukaryotic genomes exist in a complex and dynamic 3-dimensional structure that provides important regulatory information controlling gene expression programs essential for the maintenance of cell identity. Genome structure is also critical for packaging the genome in the nucleus and preserving genome stability. Genome structure is primarily dictated by its' association with the histone proteins to form chromatin. The post- translational modifications on histones play a key role in determining genome structure as they regulate the association of non-histone proteins with genomic DNA. An important challenge for eukaryotes is the epigenetic inheritance of the histone modification patterns that govern genome structure following DNA replication and cell division. This proposal seeks to identify fundamental mechanisms that regulate the epigenetic inheritance of histone modification patterns. Following passage of a replication fork, newly replicated DNA is packaged into chromatin that contains a 1:1 mixture of parental histones and newly synthesized histones. The retention of modification patterns on parental histones provides the spatial memory for the duplication of specific chromatin states. The key step in epigenetic inheritance is the transfer of the parental modification patterns to the neighboring new histones. Our work is based on the hypothesis that the new histones play a critical regulatory role in the epigenetic inheritance of chromatin states. The current proposal is based on my lab's identification of previously unknown links between the dynamic acetylation of newly synthesized histones and the epigenetic inheritance of specific chromatin states and the restoration of 3-dimensional genome architecture following DNA replication. The experiments proposed here will characterize the effect of new histone acetylation on the structure and composition of chromatin and identify factors and pathways that function with new histone acetylation to regulate the epigenetic inheritance of chromatin states. In addition, we will characterize a previously unanticipated role of new histone acetylation in the epigenetic inheritance of 3-dimensional genome architecture through regulation of the interactions between chromatin and the nuclear lamina.