猫杯状病毒分离株VP1基因序列与致病性分析  

VP1 Sequence and Pathogenicity Analysis of Feline Calicivirus Isolates

作　　者：刘健[1] 白艺兰 李鑫[1] 桂亚萍 鞠厚斌[1] 龚国华[1] 夏炉明[1] 陈伟锋[1] 朱晓英[1] 常晓静 李增强[1] 唐聪圣 王建[1] 赵洪进[1] LIU Jian;BAI Yilan;LI Xin;GUI Yaping;JU Houbin;GONG Guohua;XIA Luming;CHEN Weifeng;ZHU Xiaoying;CHANG Xiaojing;LI Zengqiang;TANG Congsheng;WANG Jian;ZHAO Hongjin(Shanghai Animal Disease Prevention and Control Center,Shanghai 201103,China)

机构地区：[1]上海市动物疫病预防控制中心,上海201103

出　　处：《畜牧兽医学报》2022年第10期3530-3539,共10页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金：上海市科技兴农重点攻关项目(沪农科创字﹝2019﹞第3-3号);2018上海农业领军人才项目。

摘　　要：旨在了解上海地区猫杯状病毒(feline calicivirus,FCV)VP 1基因与致病性,采用常规方法分离鉴定出13株FCV,经RT-PCR和测序获得分离株VP 1的基因序列,与参考株VP 1基因进行同源性和遗传演化分析,对2株分离株进行动物致病性试验。结果显示,13株上海地区分离株VP 1基因核苷酸序列相互间相似性为74.3%~99.8%,与参考株核苷酸序列和氨基酸序列相似性也较低,符合FCV易突变的特征;进化树分析表明,上海地区FCV流行株主要来自国内北方地区,少数毒株来自国外地区;通过对宿主临床症状、VP 1进化树和VS-FCV特征性氨基酸位点进行分析,筛选出7株FCV强毒株;动物致病性试结果验表明,FCV-SH202101株和FCV-SH202113株可导致感染猫发病和死亡,潜伏期为1~2 d,接种后第3天即可检测到排毒,不同年龄段猫的病程不一致,可导致幼猫5 d后死亡,成年猫病程可持续11~18 d,2株分离株在致病性方面均符合VS-FCV特征。本研究丰富了中国FCV的分子流行病学资料,为VS-FCV毒株的筛选提供了有力的证据,也为FCV疫苗的研究提供了技术支持。In order to understand VP 1 genes and pathogenicity of feline calicivirus(FCV),13 FCV strains were obtained after isolation and identification.The VP 1 genes of these FCV strains were obtained by RT-PCR and sequencing.Then,phylogenetic analyses based on the VP 1 sequences were performed with reference strains.Cat pathogenicity experiments were carried out with 2 FCV strains.The results showed that the nucleotide sequence similarity among these 13 FCV VP 1 genes was 74.3%-99.8%,and the homology of the nucleotide and amino acid was low with reference strains.The characteristics of variation were consistent with FCV.The analysis of phylogenetic tree showed that the major strains in Shanghai were from northern China,and other strains were from foreign countries.Seven VS-FCV strains were obtained by clinical symptoms,phylogenetic tree of VP 1 and VS-FCV characteristic amino acid sites analysis.Cat pathogenicity experiments showed that the strains of FCV-SH202101 and FCV-SH202113 could cause the disease and death of cats,and the incubation period was about 1 to 2 days.The FCV strains would be detected on the 3rd day after inoculation.The durations of FCV in different age groups were different,kittens would be 5 days,and adult cats would be 11 to 18 days.So the FCV-SH202101 strain and FCV-SH202113 strain had the same characteristics with VS-FCV strains in pathogenicity.This study enriched the molecular epidemiological data of FCV in China,provided strong evidence for the screening of VS-FCV strains,and also provided technical support for the research of FCV vaccine.

关 键 词：猫杯状病毒 VP1 序列同源性 系统发育树 致病性 

分 类 号：S852.659.6[农业科学—基础兽医学] S855.3[农业科学—兽医学]