候選基因LBC在雞精原干細(xì)胞形成過(guò)程中的作用研究
[Abstract]:Spermatogonial stem cells (Spermatogonial stem cells,SSCs) are the only male adult stem cells that can transfer genetic material to the next generation of stem cells as reproductive stem cells, which is the basis of spermatogenesis, in the study of the mechanism of spermatogenesis. Expounding the causes of male infertility and the treatment of male infertility and other fields has an irreplaceable role. The formation of spermatogonial stem cells is regulated by related genes, but the molecular mechanism of spermatogonial stem cells is still unknown. In this study, the specific expression of candidate gene LBC on spermatogonial stem cells was verified by knockout and over-expression of LBC gene in vitro and in vivo, using Rugao yellow chicken as experimental animal. To study the role of LBC gene in the formation of chicken spermatogonial stem cells and to provide a reference for elucidating the mechanism of spermatogonial stem cell development and differentiation. The main research in this paper is as follows: 1. The cloning of LBC gene of Rugao yellow chicken was based on the sequence of LBC gene provided by NCBI. The primers were designed to clone the CDS region of LBC gene and cloned into pMD19-T vector for sequencing. The sequencing results showed that the pMD19-T-LBC was constructed correctly and had 99.43% homology with the published CDS region of the original chicken LBC gene. Two amino acids were changed and the LBC gene in Rugao yellow chicken was cloned successfully. 2. Preparation of polyclonal antibody against LBC gene and subcellular localization study to prepare antigen polypeptide of LBC gene, immunize mice, collect serum and detect antibody titer by indirect immunofluorescence technique (IFA); The eukaryotic expression vector pEGFP-N1-LBC, was constructed and transfected into DF-1 cells for 48 hours. The transfection results were observed under fluorescence inversion microscope, and the expression of LBC-eGFPmRNA and protein were further identified by RT-PCR and indirect immunofluorescence assay. The results showed that RT-PCR could detect the expression of fusion protein at transcriptional level. The results of fluorescence microscopy and IFA showed that LBC-eGFP fusion protein was expressed in both nucleus and cytoplasm. 3. The effect of LBC gene on the formation of spermatogonial stem cells is consistent with the predicted results of bioinformatics. 3. LBC knockout vector CRISPR/Cas9-LBC and over-expression vector pcDNA3.0-LBC, were transfected into DF-1 cells and sequenced. The activity of the vector was verified by T7E1 digestion and Western Blot. The transfected ESC, were cultured in RA-induced medium. The effects of LBC deletion and over-expression on the differentiation of ESC into SSC were detected by morphological observation, immunochemical assay and QRT-PCR in vitro. At the same time, CRISPR/Cas9-LBC and pcDNA3.O-LBC vectors were injected into chicken embryos. Paraffin sections and flow cytometry were used to detect the effect of LBC deletion and overexpression on the formation of PGCs and SSCs in vivo. The results showed that both CRISPR/Cas9-LBC and pcDNA3.0-LBC vectors were constructed successfully and had activity. In vitro, compared with RA-induced group, the over-expression of LBC significantly promoted the differentiation of ESC into SSC, and the expression of integrin 偽 6, integrin 尾 1 and other SSCs-labeled genes also increased significantly on the 10th day, and the expression of integrin 偽 6, integrin 尾 1 and other SSCs-labeled genes were significantly increased on the 10th day. The relative expression of integrin 偽 6 in the overexpressing group was 2.34 compared with that in the induced group (1.96). On the contrary, LBC knockout and ESCs differentiation into SSCs were inhibited to a certain extent. After 6 days of cloning, spermatogonia-like cells could not be formed, and the decrease of the expression of totipotency marker gene Sox2 was inhibited. Compared with the induction group (0.96), the expression of integrin 偽 6 and integrin 尾 1 in the knockout group was 1.03, and the expression level of integrin 尾 1 was also decreased in the knockout group. In vivo, compared with normal chicken embryos, over-expression of LBC significantly promoted the production of PGC and SSC cells, while LBC knockout decreased the production of PGC and SSC cells.
【學(xué)位授予單位】:揚(yáng)州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:S831
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