豬瘟病毒2.1基因亞型野毒株的體外細(xì)胞傳代適應(yīng)與全基因組序列分析
[Abstract]:Classical swine fever (CSF) is a severe infectious disease caused by Classical swine fever virus (CSFV) that seriously endangers the global pig industry. The prevalence of CSF worldwide has caused huge economic losses to pig industry worldwide. CSFV has only one serotype, according to the virus genome 5'NTR, E2 and NS5B. The difference of nucleotide sequence in isogenic regions can be divided into three genotypes, which can be further divided into 11 genotypes (1.1-1.4; 2.1-2.3; 3.1-3.4). Tu Changchun was the same as in 1990s. Pathogenic ecology and molecular epidemiology of CSFV in 30 provinces and cities in China were investigated. 2.1, 2.2, 2.3 and 1.1 subtypes, while 2.1 and 2.2 subtypes, as dominant strains, are more prevalent in China and are distributed nationwide. The results showed that 34 of the positive samples were 2.1b subtype and only one positive sample was 2.2 subtype collected in 2004. This indicated that 2.1 subtype was the main epidemic strain in South China. In 2009, a 2.1a subtype SXCDK strain was isolated from Shaanxi Province for the first time, and Jiang Daliang reported that it was prevalent in Hunan and Guangdong provinces. At present, due to the effective control of CSF epidemic in some countries and regions, some countries have declared the total elimination of CSF. This also makes some of the epidemic strains become history, such as the 1.1 subtype prevalent in Europe and the 3.3 and 3.4 subtype prevalent in Asia, which have been rarely reported in recent years. Genotype 2 has quietly become the dominant strain in the world. In the 1990s, many European countries had an outbreak of CSF caused by 2.1 subtype strain. In recent years, reports were mostly about 2.2 subtype and 2.3 subtype. CSFV was detected in SF cases, and the full-length E2 gene was amplified and sequenced and phylogenetic analysis was carried out. The results showed that the * 3 strains of swine plague belong to the CSFV 2.1b gene sub type, named GD176, CSFV 2.1c gene sub type, named GD53, CSFV 2.1d gene sub type, named 2.1c, in order to further understand this. According to the replication characteristics of some strains, three strains of epidemic virus were subcultured by PK-15 cells in vitro and the genome of F46 was sequenced. TCID50/mL increased to 108.17TCID50/mL in the 46th generation, the titer of GD53 increased from 103.39TCID50/mL in the 6th generation to 108.53TCID50/mL in the 46th generation, and the titer of GD19 increased from 102.54TCID50/mL in the 6th generation to 107.88TCID50/mL in the 46th generation. Further analysis of the stability of the three epidemic strains in the process of cell passage adaptation showed that the sequence of E2 gene of the three epidemic strains was identical with that of F6, F10, F15, F20, F25, F30, F35, F40 and F46, suggesting that the envelope protein E2 was adapted to PK-6. By comparing the amino acid sequences of the proteins of the three epidemic strains and the other 2.1 subtypes, it was found that the homology between the three strains was the smallest, which was NS5A, lower than the envelope glycoprotein E2. In this experiment, the CSFV 2.1 subtype virus strain which was highly adapted to the PK-15 cells was obtained, and it was used as the virus for further study. Virulence evaluation, replication and pathogenicity studies laid an important foundation.
【學(xué)位授予單位】:吉林農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:S852.65
【共引文獻】
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