在青春期前和青春期后的小鼠卵巢发育中利用深度测序发现和分析miRNAs以及miR-484的功能特性
[Abstract]:1: identification of miRNAs at different stages of postnatal ovary development and during superovulation in mice. Small noncoding RNAs, also known as MicroRNAs, also includes ovaries in a wide range of tissues. Sequence complementation plays an important role in the regulation of gene expression at posttranscriptional level. These miRNAs may strictly regulate ovarian development and follicular development at the transcriptional level of many genes. Therefore, the identification of miRNAs in special tissues may lay a foundation for further understanding the role of miRNAs in different biological processes. In order to investigate the role of miRNAs in ovarian development and follicular development, we used Illumina deep sequencing technique to detect miRNAs sequences from eight different samples. We selected ovaries at different stages of development to detect the expression patterns of miRNAs in gonads at different stages of development obtained by injecting or not injecting PMSG or hCG into mice, from a large scale sequenced reads (one sequencing instrument). After removing the lower quality reads, the reads of the 16-26bp was selected for differential expression analysis and the annotation of the new miRNA. The analysis of miRNAs expression in ovary at different stages of development showed that some miRNAs were expressed differently at specific stage of ovarian development, while others were generally expressed. Among all differentially expressed miRNAs we found that 61 miRNAs had multiple changes in ovarian expression at different stages of development. In the upregulated miRNAs, the change multiple of mmu-miR-1298 was the highest 4.025, while the mmu-miR-150 decreased more than three times. In addition, we used seven different target gene prediction software (DIANA-mT, miRanda, miRDB, miRWalk, RNAhybrid, PICTAR5, TargetScan),) to detect 20 differentially expressed miRNAs 2659 target genes. We analyzed these target genes and found that some ovarian specific genes could be one or more miRNAs target genes. Furthermore, pathway annotations and genetic ontology suggest that these miRNAs are involved in basic cellular processes. These results indicate that there are different miRNAs. at different stages of ovarian development and superovulation after birth. Bioinformatics tools can be used to elucidate the potential regulation of these miRNAs in different pathways, biological functions and cellular components during ovarian development and superovulation. Our results provide a basis for further analysis of niRNAs and its specific role in ovarian development and superovulation. In addition, Existing studies also provide a basis for the identification and functional verification of single miRNA during ovarian development and female fertilization 2: the regulation of microRNA-484 mediated posttranscriptional genes in mouse granulosa cells during ovarian growth and follicular development Multiple follicles can have atresia. In the end, only a small number of follicles can complete ovulation. Studies have shown that follicular atresia is mainly caused by granulosa cell apoptosis, but the molecular mechanism of granulosa cell apoptosis is not clear. Therefore, in order to study the molecular mechanism of posttranscriptional modification of granulosa cells, we first used qRT-PCR to detect the expression profiles of miR-484 in granulosa cells at different stages. According to this expression pattern, we further regulate the expression level of miR-484 with miR-484 mimics and inhibitors. Our results show that overexpression or down-regulation of miR-484 can affect the expression of target gene Acvr1b, suggesting that miR-484 is involved in the growth of granulosa cells.
【学位授予单位】:华中农业大学
【学位级别】:博士
【学位授予年份】:2015
【分类号】:S814
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