猪流行性腹泻病毒山西分离株S基因遗传变异分析

为分析山西地区猪流行性腹泻病毒(PEDV)的遗传变异情况,试验利用RT-PCR方法对2014-2015年山西省疑似猪流行性腹泻的阳性病料进行克隆和测序,获得4个S基因片段,并对其基因序列和推导的氨基酸序列与国内外毒株进行比对分析。序列分析结果显示,4株PEDV山西分离株的S基因与CV777vaccine相比,在170~171bp之间插入12个核苷酸,在401~402、454~455bp之间均插入3个核苷酸,在461~468bp之间缺失6个核苷酸。4株PEDV山西分离株S基因之间核苷酸和氨基酸同源性分别为99.2%~99.8%和98.6%~99.7%,与2011-2015年中国流行毒株、CV777vaccine、attenuated DR13、CV777的核苷酸同源性分别95.0%~98.5%、93.2%~93.6%、93.2%~93.7%、93.7%~94.4%,氨基酸同源性分别为96.2%~98.9%、91.9%~92.6%、92.1%~92.9%、92.9%~94.0%。遗传进化树分析结果表明,PEDVS基因分为3个群,4株PEDV山西分离株属于第一群,与2010年以后国内流行毒株(除AH-M、SQ2014)的亲缘关系较近,与2010年以前中国流行毒株、2个日本株、7个韩国株、2个疫苗株的亲缘关系较远。研究结果提示山西省流行的PEDV发生较明显的变异,需研发新的疫苗来控制PEDV的暴发。     

1株猪流行性腹泻病毒S基因的克隆及序列分析

本研究对分离的1株猪流行性腹泻病毒(PEDV)的S基因进行克隆和测序,并进行生物信息学分析。通过ORF3序列分析发现,未有核苷酸的缺失,推测为PEDV野毒株。S基因分析结果表明,该毒株(以GD/JMEP表示)与经典的CV777毒株亲缘关系较远,核苷酸同源性为93.2%,存在多个氨基酸的缺失、插入或者突变;与近几年广东流行的PEDV毒株处于同一个群,亲缘关系较近;相比于经典传统毒株,GD/JMEP株在S基因的几个位点存在核苷酸的缺失或者插入;与目前流行毒株比较,在S基因的406位点存在新的突变。通过氨基酸序列比对分析,GD/JMEP株发生了6个新的氨基酸位点突变,表明本试验检测的GD/JMEP株为目前广东PEDV流行毒株。     

2017年江西部分地区PEDV分子流行病学调查

为了解江西地区猪流行性腹泻病毒(PEDV)的流行和变异情况,本研究利用RT-PCR方法对2017年采自江西省部分地区规模化猪场182份腹泻仔猪小肠组织和粪便样品进行检测,并设计了2对引物对37份阳性病料的S基因进行扩增、克隆及序列测定,以及与GenBank中登录的22株PEDV S基因参考序列进行遗传进化分析。结果显示,37株PEDV江西流行株的S基因序列长为4 158或4 161 bp,编码1 385或1 386个氨基酸,全部为Group 1型,与美国流行毒株较为接近,而与欧洲毒株(Br1/87)及疫苗株(CV777)亲缘关系较远;37株PEDV中有36株为G1-1亚群,1株为G1-2亚群;37株PEDV江西毒株间的S基因核苷酸序列同源性为96.9%～100.0%,氨基酸序列同源性为96.1%～100.0%,与22株参考毒株的核苷酸、氨基酸序列同源性分别为92.7%～100.0%和91.5%～100.0%;相较于CV777疫苗株,PEDV江西流行毒株的S基因存在碱基缺失、插入和位点突变现象。本研究从分子流行病学角度证实了2017年江西部分地区PEDV的流行与变异情况,为指导江西省PEDV的科学防控提供了参考依据。     

沈阳地区1株猪流行性腹泻病毒S1基因序列测定与分析

利用PEDV的S1基因的特异性引物,克隆了沈阳地区1株PEDV流行毒株(LNSY-2017)的S1基因,并通过S1基因序列比对,分析了此病毒株与其他相关毒株的亲缘关系。结果显示:LNSY-2017株S1基因(2 372 bp)与我国疫苗株CV777(2 364 bp)相比,存在16个核苷酸的插入和8个核苷酸的缺失,导致推导的氨基酸序列存在6个氨基酸的插入(⁵⁶G、⁵⁹QGVN⁶²和⁶⁹G)和6个氨基酸的缺失(⁷³N、¹⁵⁷FA¹⁵⁸、³⁸⁰YL³⁸¹和⁵²¹G),且在2个主要中和抗体表位(aa499～637和aa763～770)有11处氨基酸的突变。遗传进化分析结果显示,LNSY-2017与主要的疫苗株同源性较低(91.4%～92.5%),而与2012年韩国毒株、美国2013年毒株以及中国近年来流行毒株同源性最高(97.0%～98.7%),属于基因G2b型。结果表明,沈阳地区的PEDV流行株已经发生很大变异,因此很有必要加强对PEDV变异的监测。     

2011—2012年四川省猪流行性腹泻病毒的遗传变异分析

为分析猪流行性腹泻病毒(PEDV)的遗传变异情况,本试验从四川省11个市19个不同地区发生仔猪腹泻疾病的猪场采集的病料中分别扩增到8个PEDV(SC-8)ORF3和部分S基因序列,将其进行比对和遗传演化分析。结果显示,SC-8的ORF3基因包含674~676个碱基,编码224个氨基酸,与GenBank中登录的国内外地方流行株的核苷酸序列同源性为95.7%~99.9%,氨基酸序列同源性为98.2%~100%,与标准毒株CV777相比,核苷酸序列和氨基酸序列除存在点突变现象外,部分序列还存在核苷酸的插入和缺失性突变;部分S基因扩增长度为981bp,编码327个氨基酸,与国内外参考毒株的核苷酸序列同源性为93.2%~99.5%,氨基酸序列同源性为93.5%~100%,与标准毒株CV777相比,四川-绵阳(SCMY)分离株在92~93nt之间存在1个核苷酸插入,在2~29aa之间也有18个氨基酸发生了突变;系统进化树分析表明,8株PEDV ORF3基因均与野毒株亲缘关系较近,而与弱毒疫苗株亲缘关系较远;SC-8的部分S基因均与国内地方流行毒株亲缘关系较近,而与国外分离株的亲缘关系较远。     

浙江省猪流行性腹泻病毒S1基因克隆与序列分析

本研究旨在分析浙江省猪流行性腹泻病毒（PEDV）的遗传变异情况,利用实时荧光定量RT-PCR方法对2015-2016年浙江省内收集的58份猪腹泻样品进行检测,设计2对特异性引物对16份来自浙江不同地区PEDV阳性样品的S1基因进行RT-PCR扩增、克隆及序列测定,并应用生物信息学软件对16株PEDV浙江毒株的S1基因进行分析。结果显示,48份样品为PEDV阳性。16个毒株之间S1基因片段核苷酸和氨基酸同源性分别为93.1%~99.8%和92.4%~99.7%,与疫苗株CV777的核苷酸同源性为92.3%~95.7%,氨基酸同源性为90.7%~95.7%。与疫苗株CV777相比,15个毒株在S1基因区域存在着15个核苷酸插入和6个核苷酸缺失。系统进化分析表明,大部分毒株与国内外流行的基因Ⅱ型PEDV毒株亲缘关系较近,15个毒株与2011-2016年中国流行的基因Ⅱ型PEDV毒株核苷酸和氨基酸同源性均在96.6%以上;与早期分离的CV777株、LZC株亲缘关系较远,核苷酸和氨基酸同源性均在93.4%以下;1个毒株（ZJ16NB6）与国内外流行的S-INDEL样毒株较近,核苷酸和氨基酸的同源性较高,均在98.4%~99.5%之间。本研究结果表明,2015-2016年浙江省仔猪腹泻主要是由PEDV感染引起的,浙江省流行的PEDV同时存在着基因Ⅱ型和S-INDEL样毒株,但以基因Ⅱ型毒株为主。     

浙江省猪流行性腹泻病毒S1基因克隆与序列分析

本研究旨在分析浙江省猪流行性腹泻病毒(PEDV)的遗传变异情况,利用实时荧光定量RT-PCR方法对2015-2016年浙江省内收集的58份猪腹泻样品进行检测,设计2对特异性引物对16份来自浙江不同地区PEDV阳性样品的S1基因进行RT-PCR扩增、克隆及序列测定,并应用生物信息学软件对16株PEDV浙江毒株的S1基因进行分析。结果显示,48份样品为PEDV阳性。16个毒株之间S1基因片段核苷酸和氨基酸同源性分别为93.1%~99.8%和92.4%~99.7%,与疫苗株CV777的核苷酸同源性为92.3%~95.7%,氨基酸同源性为90.7%~95.7%。与疫苗株CV777相比,15个毒株在S1基因区域存在着15个核苷酸插入和6个核苷酸缺失。系统进化分析表明,大部分毒株与国内外流行的基因Ⅱ型PEDV毒株亲缘关系较近,15个毒株与2011-2016年中国流行的基因Ⅱ型PEDV毒株核苷酸和氨基酸同源性均在96.6%以上;与早期分离的CV777株、LZC株亲缘关系较远,核苷酸和氨基酸同源性均在93.4%以下;1个毒株(ZJ16NB6)与国内外流行的S-INDEL样毒株较近,核苷酸和氨基酸的同源性较高,均在98.4%~99.5%之间。本研究结果表明,2015-2016年浙江省仔猪腹泻主要是由PEDV感染引起的,浙江省流行的PEDV同时存在着基因Ⅱ型和S-INDEL样毒株,但以基因Ⅱ型毒株为主。     

2020—2021年我国部分地区猪流行性腹泻病毒S1、M和ORF3基因遗传进化分析

为了解2020—2021年我国部分地区猪流行性腹泻病毒(Porcine epidemic diarrhea virus,PEDV)毒株变异及遗传进化情况，试验从多个地区的51家猪场采集340份疑似感染PEDV的猪小肠组织、粪便和肛拭子，提取病毒核酸后采用RT-PCR方法扩增S1、M和ORF3基因并测序，与GenBank中PEDV参考毒株进行比对分析，利用生物信息学软件构建遗传进化树，分析核苷酸序列同源性及氨基酸序列。结果表明：共获得57份PEDV阳性样品，来源于14家猪场，猪场阳性率为27.5%,并对从阳性猪场获得的14株毒株进行命名。与经典毒株CV777相比，14株PEDV毒株的S1、M和ORF3基因均出现不同程度的氨基酸突变。在14株毒株的S1基因中，Heyuan2021-7毒株位于G1-2分支，其余13株位于G2分支，14株毒株与参考毒株GD-A核苷酸序列的相似性较高，为89.3%～99.9%,存在多处氨基酸的缺失和插入。在M基因中，14株毒株位于G2分支且与参考毒株FR-001核苷酸序列的相似性为98.1%～99.7%,只存在氨基酸突变。在ORF3基因中，FC2021-1、GD...     

猪流行性腹泻病毒广东分离株GD/JMEP的遗传演化分析

为了解广东地区猪流行性腹泻病毒(PEDV)的流行现状,对广东地区猪场进行了PEDV流行株的分离,分离得到1株猪流行性腹泻病毒,对分离毒株的S、N、M及ORF3基因进行遗传演化分析。结果表明:检测的PEDV毒株GD/JMEP与经典的CV777毒株亲缘关系较远,与近几年广东地区流行的PEDV毒株处于一个群,亲缘关系较近;通过ORF3序列分析发现,未有核苷酸的缺失;N、M基因核苷酸和氨基酸同源性分析发现,GD/JMEP与EAS1等经典毒株的同源性相对较低,与2013—2015年中国、美国、韩国等流行毒株的同源性较高;相比于经典传统毒株CV777,GD/JMEP的N基因存在9个氨基酸的差异,M基因存在11个核苷酸位点的变异和3个氨基酸的改变S基因存在几个位点核苷酸的缺失或者插入;与目前流行毒株比较,M、N基因存在核苷酸位点的改变,S基因在406位点存在新的突变;通过氨基酸比对分析,GD/JMEP发生了6个新的氨基酸位点突变,表明本试验所检测的PEDV为目前广东流行毒株。     

广西部分猪场猪流行性腹泻病毒S基因克隆及序列分析

采集广西25个猪场的病料,对猪流行性腹泻病毒(PEDV)阳性组织样品进行全S基因扩增.将41株全S基因进行序列比对及遗传进化分析,41株PEDV的S基因之间核苷酸同源性为94.8％～100％,与参考毒株核苷酸同源性为89.3％～99.4％.S基因进化树图谱显示,广西当前流行的PEDV可分为2个谱系.Attenuated...     

2012年河南省猪流行性腹泻病毒分离株S1基因遗传变异分析

We designed and synthesized two pairs of specific primers amplified S1 gene by RT-PCR method to investigate the variation in S1 genes of porcine epidemic diarrhea virus (PEDV) in 2012 in Henan.S1 genes of 5 PEDV strains were cloned and sequenced, and their phylogenetic trees were analyzed from different swine breeding farms. Sequences analysis showed that S1 genes shared 98.3% to 99.5% nucleotide identities and 97.1% to 98.9% amino acids homologies among five PEDV isolates. Compared with domestic landing PEDV from 2011, the nucleotide homologies were 88.6% to 98.0% and amino acid homologies were 85.3% to 98.7%. Compared with CV777, the nucleotide homologies were 88.7% to 89.1% and amino acid homologies were 87.3% to 88.4%. Homology analysis showed that S1 genes of 5 isolates shared the same genetic mutation, there were the same insertions and deletions. Compared with domestic mutant strains landed from 2011, there was no tendency. However, compared with CV777, there were three nucleotide insertions from 163 to 166 bp, nine nucleotide insertions from 173 to 174 bp, three nucleotide insertions from 405 to 406 bp and three nucleotide deletions from 463 to 464 bp. These insertions and deletions of nucleotides led to its corresponding changes in encoding amino acids. Phylogenetic analysis showed that S1 genes of 5 PEDV strains belonged to the third group. However compared with part of PEDV first group domestic mutant strains landed in 2011, the nucleotide homologies were 88.6% to 89.3% and amino acid homologies were 85.3% to 86.9%. CV777 was the second group. The results showed that S1 genes of PEDV prevalent strain exist in first and third groups, but mainly prevailing third group strains, the pathogenic and antigenic differences of these strains should be further studied.     

Genetic Variation Analysis of S Gene of Porcine Epidemic Diarrhea Virus Isolated in Shanxi Provine

In order to investigate the variation in S gene of porcine epidemic diarrhea virus (PEDV), the 4 strains of PEDV S gene nucleotide sequences were obtained, through RT-PCR amplification of tissue samples from Shanxi province. The obtained sequences and the deduced amino acid were analyzed and compared with the other published PEDV strains. Sequence analysis showed that compared with CV777 vaccine, there were 12 nucleotides insertions between 170 to 171 bp, 3 nucleotides insertions between 401 to 402 and 454 to 455 bp, 6 nucleotides deletion between 461 to 468 bp. The nucleotide and amino acid homologies were 99.2% to 99.8% and 98.6% to 99.7% respectively among 4 strains of PEDV S gene; Comparing with the strains isolated from China in 2011 to 2015, CV777 vaccine, attenuated DR13 and CV777, the nucleotide homologies were 95.0% to 98.5%,93.2% to 93.6%,92.1% to 92.9%,93.7% to 94.4%,respectively.The amino acid homology were 96.2% to 98.9%,91.9% to 92.9%,91.9% to 92.6%,92.9% to 94.0%, respectively. Phylogenetic analysis revealed that 4 strains of PEDV S gene belonged to the first group and had high correlative genetic relationship with the PEDV strains which isolated after 2010 in China, and had far correlative genetic relationship with the PEDV strains which isolated before 2010 in China, 2 strains of Japanese, 7 strains of South Korea, 2 vaccine strains. The results suggested that the prevalence of PEDV in Shanxi province had a more obvious variation. Therefore, it was necessary to develop a new vaccine to control the outbreak of PEDV.     

Establishment of Double PCR Detection Method of Transmissible Gastroenteritis Virus (TGEV) and Porcine Epidemic Diarrhea Virus (PEDV)

Two pairs of primers used to respectively amplify transmissible gastroenteritis virus (TGEV) S gene and porcine epidemic diarrhea virus (PEDV) M gene were designed to develop a method of differential diagnosis of TGEV and PEDV.The established double PCR could detect S gene of TGEV with the length of 299 bp and M gene of PEDV with the length of 437 bp.Negative results using CSFV,PCV2,PRRSV and PRV as control were obtained.The detection limit of this method was 10⁴ copies/μL.68 clinical samples collected from swine farm were submitted to detect TGEV and PEDV,and the result showed that the established double PCR method with the characteristics of high sensitivity and high specificity could be widely used in clinical diagnosis and epidemiological investigation.     

非典型性型猪瘟病毒云南株的分离鉴定及其E0／E2基因序列分析

从云南10个地州13个大型猪场采集到的17份样品中分离得到5株猪瘟病毒。经测序鉴定昆明、玉溪、曲靖地区分离株的核苷酸序列99．99％同源,大理和宝山地区的核苷酸序列99．99％同源,5株分离毒均属于基因二群。5株分离毒在PK-15细胞上的平均毒价约为2×10^6TCID50／mL,应用荧光抗体染色可以检测到CSFV。通过RT-PCR扩增猪瘟病毒约1200bp和700bp的E2和E0蛋白全部抗原编码区序列,并将其分别克隆到pMD18-T载体中。序列分析结果表明,5株分离株的E0和E2基因片段为697bp和1173bp,与猪瘟病毒Shimen株的核苷酸同源性仅为95．4％和96．6％、82．5g和84．3％,与C-株的核苷酸同源性分别为94．1％和95．2％、83．3％和85．4％。动物试验结果表明,分离的2株猪瘟野毒不能引起典型的猪瘟症状,但是能持续带毒。     

Sequence Analysis of S Gene of 6 Strains of Porcine Epidemic Diarrhea Virus from Guizhou

In order to understand the characteristics of S gene of porcine epidemic diarrhea virus (PEDV) in Guizhou province, and grasp the genetic variation of PEDV, according to 3 pairs of specific primers designed in the test, S gene of 6 strains of PEDV from Guizhou were amplified by RT-PCR, cloned and sequenced. Nucleotide sequence and phylogenetic tree of 6 strains of PEDV from Guizhou and reference strains were analyzed by biological information software. The result showed that the length of S gene genome of 6 strains of PEDV from Guizhou was 4 161 bp, encoding 1 387 amino acids, and the nucleotide homologies of domestic and foreign PEDV reference were from 93.3% to 98.8%, the amino acid identity were from 91.6% to 98.9%. Phylogenetic tree analysis results showed that the 6 strains were close to the American strain, Vietnam strain and the Shandong strain.They were far from the CV777, LZC, Brl and 83P-5.The experiment showed that the S gene of PEDV in Guizhou had a certain degree of amino acid change in recent year with a trend of variation. The study provided a theoretical basis for the prevention and control of PEDV in Guizhou province.     

表达猪流行性腹泻病毒COE基因的重组乳酸菌的构建与鉴定

用疑似患猪流行性腹泻病（PED）的病猪肠病料,根据猪流行性腹泻病毒（PEDV）S糖蛋白基因设计引物进行RT-PCR扩增,获得531bp的PEDV部分保护性抗原基因,将其克隆入pMD18-T载体后测序,核苷酸序列与PEDVCV777株相应序列的同源性为99．4％。根据测序结果和表达载体特点,设计一对引物,扩增PEDV部分保护性抗原基因（COE基因）501bp片段。将COE基因与乳酸乳球菌表面表达载体pNZ8149进行连接,电击转化入食品级乳酸乳球菌NZ3900细胞。重组菌以1ng／mL乳链菌肽（Nisin）诱导,通过SDS-PAGE和Westernblot分析,PEDV部分S蛋白成功表达,并具有反应原性。间接免疫荧光试验表明,重组菌表达蛋白定位于菌体细胞表面。     

猪流行性腹泻病毒CH/GX/2015/750A株的分离鉴定及全基因组序列分析

本研究旨在获得可在细胞培养中稳定、有效生长增殖的猪流行性腹泻病毒（porcine epidemic diarrhea virus,PEDV）分离毒株,并对其全基因组序列进行测定分析。应用Vero细胞从广西腹泻仔猪肠道内容物中进行病毒分离,通过细胞病变和RT-PCR对细胞培养物进行鉴定,应用下一代测序技术对分离毒株全基因组序列进行测定。结果显示,成功分离到1株PEDV,命名为CH/GX/2015/750A。该毒株可稳定有效地在Vero细胞生长增殖,并引起典型的细胞病变;已在Vero细胞连续传代25代,病毒滴度随着传代次数的增加逐渐提高并稳定在10^7.50TCID₅₀/mL。该毒株全基因组序列长28 038 bp;与22个参考毒株的全基因序列比对显示,核苷酸同源性为96.8%~99.8%,其中与YC2014株同源性最高,为99.8%。全基因组和S基因系统进化分析显示,PEDV CH/GX/2015/750A分离毒株属于Ⅱa亚群,与YC2014、PEDV-WS等变异毒株亲缘关系密切。结果表明,本研究分离获得的CH/GX/2015/750A毒株是PEDV地方流行变异毒株。     

Bioinformatics Analysis on S1 Gene of Four Porcine Epidemic Diarrhea Virus Strains

To analyse the genetic variation of porcine epidemic diarrhea virus（PEDV),one pair of primers was designed and RT-PCR was used to amplify the S1 gene epitope sequences of 4 PEDV field strains.Phylogenetic analysis showed that 4 strains were closely related to each other and belonged to the second group,and the Hunan and Henan isolates had a close relationship with JXGZ2013,GDZQ2012,GDZQ2014 strains,with the nucleotide homologies at 98.3% to 98.7%;Shanghai strain had a closed relationship with BJ-2011 strain and LZW isolates,with the higher homology at about 98.7%;Fujian isolates had a close relationship with strain of American in 2013,Japanese and Taiwan variation of China with the nucleotide homology at 99.0% to 99.5%;These results showed that a rapid variation and evolution of PEDV strains occurred in recent years,and linear B-cell epitope analysis showed that the threshold values at site 265 to 278 amino acid of 4 filed strains were higher than that of vaccine strains.The epitope differences indicated a possible of infectious that cause of patterns of epidemiology of PEDV.