牛病毒性腹瀉病毒寧夏地方分離株的分離及其E0基因原核表達載體的構建
[Abstract]:Bovine viral diarrhea / mucosal disease (BVD-MD) is an infectious disease caused by bovine viral diarrhea / mucosal disease virus (BVDV). The disease mainly occurs in cattle, calves are more susceptible to infection, but also can infect other animals, mainly causes bovine diarrhea, acute, chronic mucosal disease, persistent infection and immune tolerance, female abortion and stillbirth, and so on, causing serious economic losses to the cattle industry. In order to investigate the epidemiology and molecular epidemiology of bovine viral diarrhea / mucosal disease in Ningxia and to know the epidemic situation of the disease in Ningxia, the ELISA method was used to investigate the infection and prevalence of BVDV in Ningxia. On the basis of this, the seropositive cattle were tracked by molecular biology to obtain the local isolates of BVDV. In this study, 326 serum samples and 278 ear tissue samples sent to the laboratory were detected by BVDV antibody ELISA assay kit, and BVDV antigen ELISA kit was used to detect the antigen of ear tissue samples. Study on BVDV serology of sample. The results showed that the positive rate of BVDV antibody in 326 serum samples was 90.2and the positive rate of BVDV antigen in 278 ear tissue samples was 0.3%. The results showed that the positive rate of BVDV antibody was very high in the samples from Ningxia area, which may be related to the samples with diarrhea, abortion and other symptoms. Using cell culture technique, the virus was isolated from the diagnosed antigen, and the isolated strain of bovine viral diarrhea virus was successfully obtained, which was named BVDV-NX. The isolate was cultured on MDBK cell lines and showed a series of typical cytopathic (CPE)., such as plaque, mesh drawing and shedding. Then the virus solution was collected, the total RNA of the virus was extracted and the BVDV-NX strain cDNA was obtained by reverse transcription. The 5'-UTR gene fragment was amplified and sequenced by PCR method. N-J (Neighbor-Joining) method was selected to map the genetic evolution tree using MEGA6 analysis software. The BVDV-NX belongs to BVDV gene 1b type. According to the published sequence of BVDV-EO gene in NCBI, a pair of specific primers were designed. The E0 gene of 710bp was amplified by PCR method and sequenced. The E0 gene amplified by PCR was cloned into the prokaryotic expression vector pET-32a and transformed into Escherichia coli BL21 (DE3) for double digestion to construct the prokaryotic expression vector pET-32a-E0, which laid a foundation for further experiments.
【學位授予單位】:寧夏大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:S852.65
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