共查询到19条相似文献，搜索用时 234 毫秒
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根据文献设计2对引物,PCR扩增FPV复制非必需区中外源基因插入位点两侧翼的片段,分别克隆到pUC19和pSK质粒中,并命名为pFP1和pFP2。根据文献设计引物,PCR扩增鸡传染性喉气管炎病毒(ILTV)的GB基因的编码区。将GB基因克隆到质粒pFP1中获得重组质粒pFP1-GB;用酶切质粒pEGFP,得到GFP片段并克隆到质粒pFP2中,得到重组质粒pFP2-GFP。双酶切pFP1-GB得到FP1-GB片段,并克隆到质粒pFP2-GFP中,得到重组质粒pFP1GB-FP2GPF。酶切质粒pE/L-7.5,获得背向连接的2个鸡痘病毒启动子片段——PE/L-7.5,并将该片段克隆到重组质粒pFP1GB-FP2GPF获得重组质粒pGB-GFP,该质粒即为鸡痘病毒的转移质粒。在质粒pGB-GFP中,2个背向连接的启动子被克隆到的GB和GFP基因之间,分别启动GB和GFP基因的表达。经酶切和测序鉴定pGB-GFP,启动子PE/L和P7.5已分别正确地插入到GB和GFP基因之间,分别启动外源表达基因GB和筛选标记基因GFP的表达,从而证明已获得表达鸡传染性喉气管炎病毒GB基因重组鸡痘病毒转移载体pGB-GFP。该载体为下一步获得表达鸡传染性喉气管炎病毒GB基因的重组鸡痘病毒奠定基础。 相似文献
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鸡传染性喉气管炎病毒中国王岗株gX基因的克隆及鉴定 总被引：4，自引：1，他引：3
以ｐＵＣ１９质粒为载体克隆鸡传染性喉气管炎病毒（ＩＬＴＶ）中国王岗株的ＤＮＡ，构建了鸡传染性喉气管炎病毒ＤＮＡ的ＫｐｎⅠＤＮＡ文库。参考ＩＬＴＶ－ＳＡ２株ｇＸ基因的核酸序列，设计并合成了分别为１２ｂｐ和１３ｂｐ的１对引物。以ＩＬＴＶ中国王岗株ＤＮＡ为模板，用ＰＣＲ方法特异性地扩增出０．８４ｋｂ的ＩＬＴＶ－ｇＸ基因片段。以地高辛标记该０．８４ｋｂ的片段为探针，经Ｓｏｕｔｈｅｒｎ杂交从ＩＬＴＶ中国王岗株ＫｐｎⅠＤＮＡ文库中筛选出３个含５．２ｋｂ外源ＩＬＴＶＤＮＡ片段的ｇＸ基因阳性重组子。经酶切分析、Ｓｏｕｔｈｅｒｎ杂交、ＰＣＲ检测和该片段部分酶谱分析表明，ＩＬＴＶ中国王岗株ＤＮＡ５．２ｋｂ的ＫｐｎⅠ片段无论是片段大小还是酶切图谱均与ＩＬＴＶ－ＳＡ２株完全相同，而且Ｓｏｕｔｈｅｒｎ杂交和ＰＣＲ检测均为ｇＸ阳性，证明其中含有完整的ｇＸ基因 相似文献
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鸡传染性喉气管炎病毒LAMP检测方法的建立 总被引：1，自引：0，他引：1
为建立一种快速简单检测鸡传染性喉气管炎病毒的方法,根据已发表的鸡传染性喉气管炎病毒的TK基因序列,设计并合成了6对特异扩增鸡传染性喉气管炎病毒TK基因片段的引物,通过条件优化,成功建立了针对鸡传染性喉气管炎病毒的环介导等温扩增(LAMP)检测法,并测定其特异性和敏感性,并对采集的鸡临床样品的DNA分别进行了检测。结果表明,该法只检出鸡传染性喉气管炎病毒。敏感性扩增结果表明,LAMP检测鸡传染性喉气管炎病毒的最低浓度为100 fg的DNA模板。该LAMP方法有简便、快速和特异性高的优点,可用于临床上对鸡传染性喉气管炎病毒的快速检测。 相似文献
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为了建立一种快速的新城疫病毒(NDV)病原检测方法,试验针对鸡传染性支气管炎病毒(IBV)基因序列保守区域设计1对特异性引物和1条特异性探针,通过构建重组阳性标准质粒的方法建立了检测IBV核酸的荧光定量PCR方法,优化反应体系和反应条件后进行特异性、敏感性、重复性试验。结果表明:该检测方法特异性强,与其他禽源病毒如NDV、传染性喉气管炎病毒(ILTV)、传染性法氏囊病毒(IBDV)、禽流感病毒(AIV)、马立克病毒(MDV)均不发生交叉反应;该方法可检测到3.1×101拷贝/μL的病毒核酸,比常规RT-PCR的敏感性高100倍;重复性试验的变异系数小于2%。说明研究建立的Real-time RT-PCR检测方法特异性强、灵敏度高、重复性好,可用于IBV的定量检测。 相似文献
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提取鼠伤寒沙门氏菌23566的染色体DNA,然后用核酸内切酶BamHⅠ或HindⅢ进行消化。将消化产物连接到质粒载体pBR325中,并转化大肠杆菌宿主HB101,最终获得51个重组克隆株。通过杂交试验表明,重组质粒pLS 2和pLS 3中的嵌入片段(分别约为3.0 kb和3.4 kb)能分别与被试验的33群72种146株沙门氏菌中的143株和144株发生杂交反应,而不与试验的51株肠道非沙门氏菌杂交。用这两个探针检测从临床和食品中新分离的29株沙门氏菌,均发生了阳性杂交反应;而与分离的19株非沙门氏菌未发生杂交反应。 相似文献
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本文在我国首次报道应用核酸探针检测牛传染性鼻气管炎病毒(IBRV)。经培养、纯化IBRV,抽提IBRV全基因组DNA,用缺口翻译法标记上~(32)P,在硝酸纤维膜上进行打点杂交。试验结果表明,采用~(32)P标记的核酸探针,可检测出10Pg的IBRV—DNA,能明显区别IBRV感染细胞和未感染的正常细胞,具有相当高的灵敏度和特异性,同Dorman报道的结果相似。 应用核酸探针检测病毒核酸的技术,近年来有了突破性的进展,有的国外学者称之为第四代检测技术。其基本原理是利用放射性同位素标记的DNA或RNA(即核酸探针)与固定在硝基纤维素膜上或玻片上的单链核酸进行杂交,经过放射自显影,在X光片或感光乳胶中可看到特定的核酸片段的踪迹。由于这一技术具有灵敏度高,特异性强的优点,在医学临床诊断中已显示出它的优越性,文献报道日趋见多。在动物病毒研究方面已见到了用核酸探针检测蓝舌病,牛传染性鼻气管炎鸡马立克病,猪伪狂犬病、犬瘟热、传染性喉气管炎等病毒感染的报道。 Dorman,M,A在1985年首先报道了利用生物素标记的IBRV—DNA的HindⅢ酶切片段可检测出10pg(10~(-11)g)IBRV—DNA。随后,Dunn,D.C和Pacciarini,L以及Brunner,D也相继作了报道。我们用~(32)P标记的IBRV—DNA全基因组做为核酸探针,进行了一系列的研究,初步结果表明,我们 相似文献
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《现代畜牧兽医》2016,(3)
根据GenBank传染性喉气管炎病毒(ILTV)基因序列,设计合成了1对特异性引物。以ILTV DNA为模板,建立了检测ILTV的PCR检测方法。通过优化PCR反应条件,成功扩增出一条约690 bp的目的基因片段。而鸡传染性法氏囊病病毒、新城疫病毒、传染性支气管炎病毒、禽流感病毒基因组均未扩增为出相应的片段。敏感性试验检测出其DNA最小检出量为10-2μg。重复性试验中对3份检测为传染性喉气管炎病毒阳性病料进行检测,发现3次重复检测的结果完全一致。临床应用中运用上述优化的PCR反应条件进行PCR检测临床送检的16份疑似鸡传染性喉气管炎病毒感染病料,结果显示检出阳性样品6份,将阳性样品的PCR扩增产物克隆后序列分析显示均为鸡传染性喉气管炎病毒。结果表明,建立的PCR方法具有良好的特异性,敏感性和稳定性,可应用于传染性喉气管炎病毒鉴定和临床诊断。 相似文献
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本研究以pAT153质粒为载体,构建了小肠结肠耶氏菌毒性质粒(pVYE)经限制性内切酶Bam HI和PstI消化产生的DNA片段的基因文库.实验克隆了8株(pYBI～8)pVYE的BamHI片段和6株(pYPI～6)pVYE的PstI片段的重组子.其中pYB4、pYB7、pYB8重组质粒中插入的pVYE—Bam HIDNA片段的分子量分别为8.7、3.8、20kb;pYP3、pYP5、pYP6重组质粒中插入的pVYE-Pst I DNA片段的分子量分别为4.5、3.0、7.0kb.本实验结果为进一步筛选和制备特异性基因探针奠定了基础. 相似文献
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Detection of infectious laryngotracheitis virus infected cells with cloned DNA probes. 总被引：1，自引：1，他引：0 
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下载免费PDF全文 E Nagy 《Canadian journal of veterinary research》1992,56(1):34-40
A genomic library of infectious laryngotracheitis virus (ILTV) DNA BamH1 fragments was prepared and two cloned fragments were evaluated for their potential as probes for the detection of ILTV infected cells. The virus was purified by a modified sucrose density gradient procedure for the isolation of pure ILTV DNA. A genomic library was constructed using BamH1-digested ILTV DNA and pGEM7 as a vector. A 1.1 kb cloned BamH1 fragment of ILTV DNA was tested in a slot or dot blot assay for the detection of ILTV infected cells. The limit of detection for this probe was at least 0.12 ng of pure ILTV DNA. The probe was able to identify both chicken embryo liver (CELi) cells and choriallantoic membranes infected with ILTV. Chicken embryo liver cells infected with several field isolates and a vaccine strain of ILTV were positive by dot blot analysis using this probe. Some qualitative differences in the degree of hybridization to cells infected by different ILTV isolates were observed. Uninfected cells and cells infected with fowlpox virus, turkey herpesvirus, Marek's disease virus or Newcastle disease virus were negative by the same assay. Compared with the 1.1 kb fragment, a larger 6 kb cloned BamH1 fragment of ILTV DNA showed a stronger hybridization signal to DNA from ILTV infected cells. 相似文献
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在构建的小肠结肠耶氏菌毒性质粒DNA基因文库pYB1～8与pYP1～6的基础上,筛选出了pYB7和pYP6克隆株.用限制性内切酶Bam HI消化pYB7,Pst消化pYP6,可分离出3.8kb和6.4kb的插入性DNA片段.以这两个基因片段为目的基因,用生物素化dUTP和光敏生物素标记,获得了生物素标记的基因探针.该探针能检出10pg以上的强毒小肠结肠耶氏菌DNA,不与无毒小肠结肠耶氏菌及大肠杆菌、鼠伤寒沙门氏菌、金黄色葡萄球菌等18种对照菌反应,具有高度的特异性和敏感性.pYB7与pYP6探针对不同血清型及来源的小肠结肠耶氏菌检测,其结果与自凝性试验、依钙试验等结果相符;对小肠结肠耶氏菌强毒株与无毒株检定的准确率为100%. 相似文献
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Dimeric and monomeric replicative forms of DNA of porcine parvovirus (PPV) strain NADL-2 were isolated and examined by restriction enzyme analysis and reciprocal Southern blot hybridization during development of a DNA probe for PPV. Genomic single stranded PPV DNA was 5.0 kb long, and results substantiated the rolling-hairpin model of parvovirus DNA replication with the primer sequence located in the 3' terminal hairpin loop. An additional finding was the generation of a 4.7 kb species of viral DNA which was considered to be a 0.3 kb deletion variant of genomic PPV DNA. A 3.0 kb DNA fragment obtained by Pst I/Hind III digestion of monomer replicative form DNA was cloned into a plasmid vector, pUC 19. The cloned fragment, recovered from transformed Escherichia coli strain TB1 and labelled with [32P] dCTP, was evaluated by dot hybridization as a probe for PPV in infected cell cultures. The probe was specific for PPV infected cells, and was 100 times more sensitive than the standard hemagglutination test. 相似文献
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Differentiation of infectious laryngotracheitis virus strains using restriction endonucleases 总被引：1，自引：0，他引：1
Strains of infectious laryngotracheitis virus (ILTV) were examined using an indirect immunofluorescent test (IIF) and with restriction endonucleases for detecting intratypic differences. Electrophoretic analysis of ILTV DNA fragments cleaved with restriction endonuclease Hind 111 clearly distinguished between strains. The IIF test did not discriminate between strains. A molecular weight estimate of ILTV DNA was made by summation of restriction endonuclease fragments cleaved with BamH1 (102.1 X 10(6)) and Hind111 (97.35 X 10(6)). Differences between the estimates may indicate the presence of submolar fragments. 相似文献
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Detection of bovine viral diarrhea virus by spot hybridization with probes prepared from cloned cDNA sequences 总被引：1，自引：0，他引：1
A cytopathic strain of bovine viral diarrhea virus (BVDV) was purified from infected cell culture fluids by isopycnic density-gradient centrifugation. Genomic RNA was extracted and tailed with adenine residues at the 3' end with poly-A polymerase. Double-stranded complementary DNA (cDNA) was synthesized, using the poly-A-tailed RNA as a template and oligo-dT as a primer, and then cloned into the pUC9 plasmid. Virus-specific cDNA sequences, varying in length from 0.5 to 2.5 kilobases (kb), were obtained. One BVDV-specific sequence of cloned cDNA, 1.1 kb in length and with an internal Pst I restriction endonuclease cleavage site, was selected for use as a probe. The cloned cDNA insert was removed from the plasmid either with or without flanking plasmid sequences and labeled with 32P-nucleotides by nick translation for use as hybridization probes for BVDV. The performance of probes of smaller fragments of the insert was compared to that of the intact sequence in hybridization assays. In addition, 2 methods of specimen preparation were compared to establish optimum parameters for hybridization. The hybridization assay was 10-100 times more sensitive than infectivity assays for BVDV in infected cell cultures. Freezing of specimens reduced by 10-fold the sensitivity of hybridization for BVDV target sequences. The probes prepared from the cloned cDNA hybridized with all cytopathic and noncytopathic BVDV strains tested but not with uninfected cell cultures, cellular ribosomal RNA, bovine coronavirus, bluetongue virus, or bovine adenovirus 3. Probes prepared with native plasmid DNA did not hybridize with BVDV or uninfected cell cultures.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
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The DNAs of virulent and avirulent strains of infectious laryngotracheitis virus (ILTV) showed greater than 96% homology by reciprocal DNA:DNA hybridization. Nevertheless, by use of selected restricted DNA fragments, it was possible to differentiate strains according to pathotype more readily than by the more laborious restriction enzyme analysis. Restricted DNA fragments were successfully cloned into Escherichia coli HB101 cells and could be used not only for pathotyping ILTV strains but also for their differentiation from other avian viruses. 相似文献
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DNA extracted from Mycobacterium paratuberculosis, which had been isolated from a cow with clinical Johne's disease, was used to make a gene library in the Escherichia Coli expression vector phage lambda gt11. Plaque-lifts were made from the library onto nitrocellulose membranes. These were screened by differential hybridization using radiolabelled chromosomal DNA from M. paratuberculosis and Mycobacterium phlei. By this method six recombinants that hybridized to M. paratuberculosis but not to M. phlei were identified. Three of these, designated lambda gt-R3, lambda gt-R4 and lambda gt-RS, containing DNA inserts of 2.5,1.5 and 3.7 kilobases (kb), respectively, were chosen for further analysis of their insert specificities. Following restriction with the endonucleases EcoRI and BamHI, the digestion fragments from the three recombinants were transferred to nitrocellulose membranes and probed with radiolabelled DNA from M. paratuberculosis and M. phlei. As expected, M. paratuberculosis DNA hybridized to all the fragments. M. phlei DNA hybridized to both the fragments that were generated from lambda gt-R3, to the single fragment from lambda gt-R4 and to two of the three fragments generated from lambda gt-RS. The fragment with which M. phlei DNA failed to hybridize was 0.45 kb in length. Multiple copies of this fragment were made in the plasmid pGEM-2; the plasmid DNA was then harvested and radiolabelled. Designated PAM-1, the radiolabelled material hybridized to a 3.7 kb fragment of EcoRI-digested M. paratuberculosis and to 2.2 kb fragments of similarly digested M. avium serovars 2 and 3. PAM-1 did not hybridize to DNA from the other four mycobacterial species examined or from Nocardia asteroides. The restriction fragment length polymorphism thus demonstrated distinguishes M. paratuberculosis from M. avium serovars 2 and 3. 相似文献