人類基因組組蛋白修飾的相互作用及功能分析
[Abstract]:Epigenetic modification mainly includes DNA methylation, histone modification and miRNA. Histone modification is the main modification that plays a dynamic role in the genome level. At present, more than 100 kinds of histone modifications have been found. The common histone modification types include methylation, acetylation and so on, most of which are located on histone H3 and H4. Studies have shown that the interaction of histone modifying enzymes leads to the interaction between histone modifications. Based on the biological hypothesis that chromatin modification and genomic elements co-affect DNA methylation, an approach algorithm based on biological mechanism is developed to characterize their effects on methylation, and the proximity spectra of CpG sites are obtained. Eight functional CpG loci were clustered by cluster analysis, and there were highly consistent functional and chromatin modification patterns in the cluster. Bayesian network analysis inferred the interaction between interacting histone modification and (pairs), including cluster sharing and clustering specificity. In order to further study the functional effects of protein modification synergism, gene expression was induced by changes in the interaction of two representative modifications (H3K4me3 and H3K27me3) on the tail of histone H3 in stem cell differentiation. Chromatin changes were analyzed. Based on the histone modification data of 10 cell lines and H1 stem cells, the specific and consistent histone modification patterns of stem cells before and after differentiation were studied. The patterns found in this study are consistent with previous reports, for example, the genes located by K4K27 enriched by GO are related to the development process. It is also found that the combined histone modification pattern has a certain effect on the recognition of cell-specific genes and is well verified by gene expression data. This study is of great significance in revealing a new pattern of coregulation of histone modification gene expression and studying the relationship between histone modification mode and function.
【學(xué)位授予單位】:哈爾濱醫(yī)科大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2011
【分類號】:R346
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