Phylogenetic analysis of the sigma 2 protein gene of turkey reoviruses

The open reading frame of the S3 segment encoding the sigma2 protein of four turkey reovirus field isolates was analyzed for sequence heterogeneity. The turkey reoviruses we present here have a 97% amino acid identity to turkey NC 98. The S3 nucleotide and amino acid sequence similarity was < or =61% and 78%-80%, respectively, when compared to the chicken reovirus isolates. Comparison of amino acid sequences from chickens and turkeys with that of a duck isolate revealed a 53% and 55% similarity, respectively. Phylogenetic analyses, based on both nucleotide and amino acid sequence, resulted in three major groups among the avian reoviruses; these groups were clearly separated by species. The results of this study provide further evidence, based on the deduced sigma2 sequence, that turkey reoviruses form a distinct, separate group relative to chicken and duck isolates. In addition, as a result of the limited sequence identity with their avian counterparts, turkey reoviruses could potentially be considered a separate virus species within subgroup 2 of the Orthoreovirus genus.     

Sequence analysis of four double-stranded RNA genomic segments reveals an orthoreovirus with a unique genotype infecting psittaciformes

This paper describes the characterization of four double-stranded ribonucleic acid segments, S1, S2, S3, and S4, of a newly identified pathogenic reovirus from parrots. The four segments share a unique 5' terminus GCUUUUC. The amino-acid sequences of the conserved sigma A and sigma NS proteins show less than 60% sequence similarity, whereas those of the outer capsid proteins sigma B and sigma C have at most 47% sequence similarity to their counterparts in other bird or bat reoviruses. In a phylogenetic analysis of the amino-acid sequences, the proteins coded for by the S1 segment, P10, P17, and sigma C, group with their homologous proteins in other avian reoviruses, whereas the major capsid protein, sigma B, and the nonstructural protein, sigma NS, show more sequence similarity to their bat reoviral counterparts. The phylogenetic relationship of sigma A with the homologous avian and bat sequences is unresolved. The possibility that the parrot reovirus has evolved from an ancestral, more batlike reovirus is discussed. It is proposed to designate this unique virus as PsRV.     

番鸭呼肠孤病毒非结构基因的克隆和序列分析

参考GenBank禽呼肠孤病毒(Avian Reovirus,ARV)和番鸭呼肠孤病毒(Muscovy Duck Reovirus,MDRV)非结构基因(NS)序列设计合成一对引物,对番鸭呼肠孤病毒S14和C4株NS基因进行RT-PCR扩增,克隆到pMD18-T载体中,并对克隆产物进行酶切鉴定和测序;番鸭呼肠孤病毒NS基因由1 291 bp核苷酸组成,与禽呼肠孤病毒NS基因相比,在非编码区第1155位少一个碱基,本文第一次证实1291bp是番鸭呼肠孤病毒NS基因特有的长度;番鸭呼肠孤病毒S14和C4株NS基因的5'末端和3'末端分别为5‘GCTTTT和TCATC-3',是禽类呼肠孤病毒基因末端特有的碱基序列,S14和C4株NS基因的的有效阅读框(24～1127bp)编码367个氨基酸组成的蛋白,分子量约为40kDa;番鸭呼肠孤病毒S14和C4株NS蛋白等电点分别是7.3和7.0,GC含量分别为54.26%和53.71%,番鸭呼肠孤病毒S14和C4株NS基因间核苷酸同源性为99.3%,仅有4个氨基酸差异,S14和C4与法国番鸭呼肠孤病毒89026株NS基因核苷酸同源性分别为87.8%和87.9%,与鸡关节炎病毒S1133 NS基因同源性分别为79.0%和79.3%;进化树分析表明本研究中的两株番鸭呼肠孤病毒非结构基因(NS)与番鸭呼肠孤病毒的亲缘关系比禽呼肠孤病毒近的多,建议番鸭呼肠孤病毒应归属为正呼肠孤病毒属第二个亚群中不同于禽和内尔森贝海湾呼肠病毒独立基因群.     

鸭Ⅰ型禽副粘病毒YH99V株HN基因的克隆和序列分析

在浙江地区进行鸭病病因的调查过程中，从患病鸭群中分离到一株引起鸭产蛋锐减而不死亡的病毒，经鉴定该病毒属于禽副粘病毒Ⅰ型，命名为YH99V株。以YH99V株的基因组RNA为模板，通过RT—PCR一步法扩增出其HN基因的cDNA片段，然后将其克隆至pMD18-T载体中，对其进行序列测定。测序后拼接出HN基因的序列长度为1785bp，该基因的ORF总长为1734bp，编码577个氨基酸。将YH99V株HN基因序列和推导的氨基酸序列与新城疫毒株的HN基因相应序列比较后发现，它们的核苷酸序列同源性分别在82．1％～99．7％，氨基酸序列同源性为87．2％～99．5％。在同源性比较的基础上，进一步绘制了Ⅰ型禽副粘病毒株HN基因的系统发育树。这对于Ⅰ型禽副粘病毒毒力基因的功能分析和该病的分子流行病调查有着重要的意义。     

Yeast-derived sigma C protein-induced immunity against avian reovirus

Avian reoviruses (ARVs) can result in disease and economic losses in the poultry industry. Vaccines against ARV may not provide full protection and can cause adverse reactions. The coding sequence of the sigma C protein from strain S1133 of avian reovirus was expressed in Schizasaccharomyces pombe. Sigma C protein expression was demonstrated by Western blotting, and the protein was evaluated for its ability to protect specific-pathogen-free (SPF) chickens against challenge with the virulent S1133 strain. Serologic and challenge-infection data showed the efficacy of the recombinant vaccine administered orally each week for 3 consecutive wk. Sigma C protein induced antibody, as determined by enzyme-linked immunosorbent assay. Percentage (%) protection induced by the low dose (125 microg purified yeast-expressed sigma C protein/chicken) or the high dose (250 microg purified yeast-expressed sigma C protein/chicken) was 64 and 91, respectively. The commercial vaccine administered once or twice provided 82% protection. Results supported the feasibility of a plant-derived vaccine for use in poultry immunization schemes.     

Determination of the sequence of the complete open reading frame and the 5'NTR of the Paderborn isolate of classical swine fever virus

The classical swine fever (CSF) epidemic in the Netherlands in 1997-1998 lasted 14 months, during which 429 infected and 1300 at risk herds were culled, at an estimated economical cost of 2 billion US dollars. Despite the overwhelming scale of the epizootic, the CSF virus (CSFV) strain causing the outbreak has remained largely uncharacterized. The Dutch epizootic is epidemiologically linked to a small CSF outbreak in 1997, in Paderborn in Germany. E2 and partial 5' NTR sequencing has shown that the index Paderborn isolate, and several Dutch isolates taken during the 1997-1998 epizootic, are virtually identical, confirming that the Paderborn isolate triggered the Dutch outbreak, and furthermore showing that this single isolate was stable throughout the whole Dutch outbreak (the above reviewed in [C. Terpstra, A. J. de Smit, Veterinary Microbiol. 77 (2000) 3-15]). We determined the nucleotide sequence of the 5' NTR (by 5' RACE) and the complete open reading frame of the Paderborn isolate (GenBank AY072924). Our sequence was identical to previously published partial 5'NTR and E2 sequences for the index Paderborn 1997 and Dutch 1997 (Venhorst) isolates, confirming the identity of the virus we sequenced. Phylogenetic analysis based on the complete open reading frame showed that Paderborn is genetically very different from common European laboratory reference strains. Neutralization studies showed that Paderborn is also antigenically very different from common laboratory strains such as Alfort 187. Paderborn is the only recent European CSFV field isolate for which a complete sequence is available, and given Paderborns genetic and antigenic uniqueness, the Paderborn sequence may have practical use for diagnostic and vaccine antigen development.     

鲤鱼外周血白细胞TLR5M全长cDNA克隆及序列分析

本试验以鲤鱼TLR5M的EST序列为基础进行5'-RACE试验,获得了其cDNA的全长序列。结果表明,该序列共3182 bp,包含38 bp的5'端非编码区,486 bp的3'端非编码区,1个2658 bp的开放阅读框(ORF),共编码885个氨基酸。序列同源性比对结果表明,该序列与麦瑞加拉鲮鱼TLR5基因同源性高达84.46%。     

顿河红豆草凝集素cDNA克隆与序列分析

利用RT-PCR技术从顿河红豆草含浓缩单宁的愈伤组织总RNA中分离克隆了凝集素cDNA.该cNDA包含完整的编码区和3’端非编码区,所编码的氨基酸序列与其它豆科植物凝集素具有较高的同源性。     

Characterization of novel avian paramyxovirus strain APMV/Shimane67 isolated from migratory wild geese in Japan

An avian paramyxovirus (APMV) isolated from goose feces (APMV/Shimane67) was biologically, serologically and genetically characterized. APMV/Shimane67 showed typical paramyxovirus morphology on electron microscopy. On hemagglutination inhibition test, antiserum against APMV/Shimane67 revealed low reactivity with other APMV serotypes and vice versa. The fusion (F) protein gene of APMV/Shimane67 contained 1,638 nucleotides in a single open reading frame encoding a protein of 545 amino acids. The cleavage site of F protein contained a pair of single basic amino acid (VRENR/L). The nucleotide and deduced amino acid sequences of the F gene of APMV/Shimane67 had relatively low identities (42.9–62.7% and 28.9–67.3%, respectively) with those of other APMVs. Phylogenetic analysis showed that APMV/Shimane67 was related to NDV, APMV-9 and APMV-12, but was distinct from those APMV serotypes. These results suggest that APMV/Shimane67 is a new APMV serotype, APMV-13.     

柔嫩艾美耳球虫抗药性相关基因M20的克隆与表达

利用前期构建的柔嫩艾美耳球虫（Eimeria tenella）地克珠利抗药株和马杜拉霉素抗药株与各自母株之间的抑制性消减文库而获得的ESTs序列,选择其中一个差异表达的EST序列（克隆号为M20）,采用RACE技术,以柔嫩艾美耳球虫敏感株孢子化卵囊cDNA为模板,扩增获得了该基因的全长cDNA序列,命名为M20,该基因全长847 bp,包括一个525 bp的开放阅读框,编码174个氨基酸,预测理论分子量约为19 ku。实时荧光定量PCR结果显示,该基因在敏感株中表达量高于地克珠利抗药株和马杜拉霉素抗药株;在不同发育阶段中,未孢子化卵囊表达量高于孢子化卵囊、子孢子以及裂殖子阶段虫体。将该基因克隆于原核表达质粒pET28b中,构建重组质粒pET28b-M20,转化大肠杆菌BL21（DE3）后,经IPTG诱导表达获得了重组蛋白,分子量约约为23 ku,该蛋白以包涵体形式存在,在IPTG诱导8 h后表达稳定,Western blot检测表明,其具有较好的免疫原性。     

Genetic diversity of porcine circovirus type 2 (PCV2) in the Romanian wild boar population

In this study, we have analyzed 23 PCV2 ORF2 sequences recovered from wild boar population in Romania. The PCV2 sequences were originated from different geographical regions in Romania, and collected between 2008 and 2009 during the classical swine fever virus (CSFV) surveillance campaign. Complete open reading frame 2 (ORF2) nucleotide sequences were obtained and compared with sequences mainly from European and Asian isolates. The Romanian sequences were identified as belonging to previously described clusters 2a and 2b, with high degree of heterogeneity (PCV2 ORF2 nucleotide homology ranged between 90.1% and 100%). Interestingly, for cluster 2a, the majority of the sequences (8 from a total number of 9) clustered mainly with the Asian isolates (especially China, but also India and South Korea), with three exceptions from Europe previously reported in Germany, Belgium and The Netherlands.     

禽流感病毒分离株 A/Chicken/Wangcheng/4/2001(H9N2)核蛋白基因(NP)的克隆和序列分析

用无特定病原体 (ＳＰＦ)鸡胚增殖禽流感鸡体分离株Ａ／Ｃｈｉｃｋｅｎ／Ｗａｎｇｃｈｅｎｇ／４／２００１(Ｈ９Ｎ２)(ＷＣ２００１),提取病毒总ＲＮＡ。根据已发表的Ａ型流感病毒株ＮＰ基因序列 ,设计一对引物 ,运用反转录 -聚合酶链反应(ＲＴ -ＰＣＲ)扩增该病毒分离株的ＮＰ基因 ,克隆后进行序列测定。序列分析表明 ,扩增的ＮＰ基因为相应的开放阅读框架。ＷＣ２００１株ＮＰ基因序列与数株Ａ型流感病毒ＮＰ序列进行比较 ,相互间同源性在８０%左右 ,其中与Ａ／Ｄｕｃｋ／ＨｏｎｇＫｏｎｇ／Ｙ２８０／９７(Ｈ９Ｎ２)有很高的同源性 ,而与人流感病毒株和猪流感病毒株差异较大 ,显示禽流感病毒特征。     

Genetic diversity of porcine circovirus type 2 (PCV2) in the Romanian wild boar population

In this study, we have analyzed 23 PCV2 ORF2 sequences recovered from wild boar population in Romania. The PCV2 sequences were originated from different geographical regions in Romania, and collected between 2008 and 2009 during the classical swine fever virus (CSFV) surveillance campaign. Complete open reading frame 2 (ORF2) nucleotide sequences were obtained and compared with sequences mainly from European and Asian isolates. The Romanian sequences were identified as belonging to previously described clusters 2a and 2b, with high degree of heterogeneity (PCV2 ORF2 nucleotide homology ranged between 90.1% and 100%). Interestingly, for cluster 2a, the majority of the sequences (8 from a total number of 9) clustered mainly with the Asian isolates (especially China, but also India and South Korea), with three exceptions from Europe previously reported in Germany, Belgium and The Netherlands.     

禽流感病毒WUDI-H9N2株的分离鉴定及 HA基因的分子特征研究

本研究于2011年8月从山东省某鸡场鸡群中分离一株病毒,通过对分离株进行病毒血凝试验及血凝抑制试验、RT-PCR、动物回归试验等方法证实已分离到禽流感病毒(avian influenza virus,AIV) H9N2,命名为WUDI-H9N2株。根据GenBank上发表的AIV H9病毒的HA基因序列,用Oligo 6.0生物学软件设计引物,对分离株WUDI-H9N2株HA基因进行扩增、测序及序列分析。将分离的AIV H9毒株与其他血清型代表参考毒株分别进行核苷酸和氨基酸系统发生进化关系分析。WUDI-H9N2株 HA基因全序列长为1708 bp,无核苷酸的插入和缺失,cDNA包含了1个完整的开放阅读框(ORF),编码区由1683 bp组成,共编码560个氨基酸。HA序列与国内参考毒株的核苷酸序列的同源性在92.9%~98.1%之间,其中与安徽分离株A/chicken/China/AH-10-012010(H9N2)同源性为98.1%。     

Recombinants from a proviral bovine leukemia virus genome corresponding to the 3' region transactivate viral LTR in NIH3T3 and non-infected FLK cells

Bovine leukemia virus (BLV), like human T-cell leukemia viruses, Types I and II, contains three open reading frames at the 3' end of its genome. The longest open reading frame encodes a transactivator protein which is generated by a doubly-spliced mRNA. A series of co-transfection experiments, using proviral BLV pX expression plasmids under the control of the Moloney leukemia virus LTR and the indicator plasmid containing the assayable lac Z gene under the control of BLV LTR, revealed that both NIH3T3 cells and non-infected fetal lamb kidney cells are able to express an active transactivator protein.     

Cloning and sequence analysis of US1gene in duck enteritis virus

In this paper,a 1,860 bp sequence in IRs region of duck enteritis virus(DEV) was amplified by single oligonucleotide nested PCR with a single primer designed according to partial sequence of US1 and then a pair of primers designed according to the 3' UTR of US8 gene and 5' end of the new getting sequence were used to amplify a 2,426 bp sequence toward the TRs region.Sequence analysis revealed that the both sequences contained an identical 990 bp open reading frame of DEV US1 gene.The two ORFs were in opposi...     

Identification of a potentially important antigen of pasteurella haemolytica

To identify antigens which may be important for stimulating immunity to pneumonic pasteurellosis, a bovine antiserum to whole P. haemolytica was used to screen a recombinant lambda gt11/P. haemolytica expression library. One of the recombinant bacteriophage clones identified with the bovine antiserum, SW20C, expressed a fusion protein which was also recognized by rabbit antiserum to partially purified P. haemolytica culture supernatant and was found to be immunogenic in guinea pigs. The guinea pig antibody recognized a 100 kDa protein in P. haemolytica cell lysates. Sequence analysis of the cloned DNA from SW20C identified a fragment of 1443 bp with a small open reading frame that was contiguous with the lacZ sequence. The 153 bp P. haemolytica-specific open reading frame encoded a polypeptide of approximately 6kDa. Homology searches of Genbank and the EMBL data bases revealed no homology of this open reading frame with any other bacterial sequences including P. haemolytica leukotoxin and Ssa1. Evaluation of sera from calves that were scored either susceptible or resistant to experimental pneumonic pasteurellosis demonstrated a significant (P < 0.001) correlation between the intensity of the antibody response to the SW20C antigen and resistance to disease.     

A亚群禽白血病病毒QC6281株的分离与gp85基因序列分析

本试验通过病理剖检、接种DF-1细胞、ELISA及RT-PCR检测,从北京某种鸡场的疑似禽白血病的父母代蛋鸡中分离到1株A亚群禽白血病病毒,命名为QC6281.并根据GenBank中已发表序列设计引物,扩增env基因片段并将其克隆到pMD19-T-simple 载体中,扩增的env基因片段大小为1 239 bp,其中包括完整的gp 85基因,将gp 85基因亚克隆到pMD19-T-simple载体中并测序,gp 85基因大小为1 032 bp,编码344个氨基酸.将env基因片段和推导的氨基酸序列与GenBank中9株ALV的env基因相应序列做同源性分析并制作进化树图谱.发现QC6281与已发表的A亚群禽白血病病毒株该区域核苷酸同源性在83.8%～98%,氨基酸同源性在86.9%～98.5%.其中与Myeloblastosis-associated virus type 1(L10922.1)同源性最高,核苷酸同源性为98%,氨基酸同源性为98.5%;且与Myeloblastosis-associated virus type 1(L10922.1)亲缘关系最近.本研究为该毒株的生物学特性以及致病性研究打下基础.