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网状内皮组织增生症病毒LAMP检测方法及感染性分子克隆的建立
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摘要
网状内皮组织增生症(Reticuloendotheliosis,RE)是禽类一种重要的免疫抑制性和致瘤性疾病。近年来,国内外鸡群中REV流行逐渐严重。REV与马立克氏病病毒(MDV)、鸡贫血病毒(CAV)和J-亚群禽白血病病毒(ALV-J)几种免疫抑制性病毒的混合感染在部分养鸡场中普遍存在,使得鸡群免疫力低下,导致禽流感、新城疫等重要疫苗免疫失败,并容易造成继发感染,使疫病的诊断和防控难度加大。另外,REV基因组易于整合到MDV和FPV基因组中,从而导致商品化疫苗受到污染。使用非SPF禽胚制备的疫苗也有污染REV的潜在危险。近来,RE的危害正逐渐被人们关注,但RE的诊断、流行病学以及基础研究仍不完善。为了更好地认识和防控RE,本文进行了如下方面的研究:
     1 REV LAMP可视化快速检测方法的建立
     借助新兴的环介导等温扩增技术(loop-mediated isothermal amplification, LAMP),设计了4条针对REV pol基因的6个位点的特异性引物,建立了一套简便、灵敏和特异的检测方法。该方法不与常见的感染鸡群的DNA病毒(MDV、CAV)及ALV-J发生交叉反应,比常规的PCR方法灵敏25倍;另外,该LAMP方法在临床样品方面的检测效率与传统的PCR方法相当;而且操作简单,不需要复杂的仪器,常规水浴锅即可进行,肉眼可直接观察检测结果。
     2 REV gp90蛋白的表达及多克隆抗体的制备
     利用PCR技术,从病料中扩增REV gp90基因,将其分别克隆至真核表达载体pFastBacHTA和原核表达载体pET-28a(+)中,从而构建了真核表达的供体质粒pF-gp90和原核表达质粒pET28-gp90。pF-gp90转化大肠杆菌DH10Bac感受态细胞,使gp90基因整合到Bacmid穿梭载体中,获得重组穿梭载体Bacmidgp90。通过脂质体介导将其转染Sf9昆虫细胞,获得重组杆状病毒rBacgp90。通过Western blot和IFA验证,rBacgp90可正确表达gp90蛋白,蛋白大小约为45kDa,变性和自然状态下均能够被识别,具有良好的生物活性。将pET28-gp90转化至大肠杆菌BL21 (DE3)感受态细胞,经IPTG诱导,进行gp90蛋白原核表达并通过Western blot检测,确定其以包涵体形式正确表达。纯化gp90蛋白并免疫6-8周龄Balb/c小鼠,制备抗gp90的多克隆抗体。免疫小鼠后获得的抗血清可与感染CEF细胞的REV发生特异性反应,ELISA效价达到1:12800。
     3 RE流行病学研究
     对我国9个省35个蛋鸡场进行了血清学调查,89%的鸡场REV抗体阳性,阳性率为1%-98%,平均阳性率为15%,说明REV在我国广泛流行,部分地区较为严重。将研磨后无菌处理的病料接种于CEF或DF1,置37℃CO_2培养箱培养,7d后收毒,连续盲传至少3代。做间接免疫荧光、PCR和电镜检测,确定是否分离到病毒。从东北地区的黑龙江、吉林、辽宁等省的一些鸡场分离到10株REV。以HLJR0901为例,测得其TCID_(50)为10~(5.2)/mL。通过绘制复制动力学曲线对其在CEF细胞上的增殖动态规律进行了研究,发现第六天和第七天REV增殖的滴度最高。将所分离的REV的主要保护性抗原基因-gp90基因,克隆至pMD-18T载体,测序并上传GenBank。以前病毒cDNA为模板,将HLJR0901基因组分六段进行了克隆和测序。最后确定:HLJR0901全长8284bp,GenBank登录号为GQ415646。序列分析结果显示:HLJR0901的LTR序列与FA株完全同源;与APC-566的同源性也高达99%。Pol是最稳定基因。LTR核苷酸、gag氨基酸、pol氨基酸、gp90氨基酸、env氨基酸以及全基因组核苷酸的遗传进化树显现了一个共同的特征:①所比较的毒株明显地分为三个分枝,分别代表REV的3个亚型;②东北分离株形成一个独立的群体,与我国早期南方毒株HA9901(亚型I)同源性较低,可能源于不同的祖先;③我国至少存在两种REV亚型(I型和III型),III型REV是目前东北地区的流行毒株。④东北分离株与目前美国和台湾的一些流行毒株亲缘关系较近。
     4 REV感染性分子克隆的建立及应用
     通过重叠延伸PCR (SOE PCR)和酶切拼接将HLJR0901的全基因组克隆于pBluescript II载体中,并在基因组中通过改变核苷酸(C2250G)消除了其中的MscI酶切位点作为分子标签,构建了REV感染性分子克隆pBlu-mHLJR0901。将纯化的pBlu-mHLJR0901转染鸡胚成纤维细胞(CEF)进行病毒拯救,经间接免疫荧光(IFA)、PCR、测序及电镜鉴定,成功拯救出REV。拯救病毒rHLJR0901在CEF细胞上具有与亲本毒相似的复制特性。基于感染性分子克隆,开展了表达EGFP的重组REV的构建:在HLJR0901全基因组934位点(gag基因启动子上游)和7713位点(env基因终止子下游)插入了EGFP基因,转染CEF细胞后,前者EGFP能够瞬时高效表达,后者不能表达。但最终均没有拯救出重组病毒,其具体机制有待进一步探讨。本研究还发现,REV LTR的启动子功能具有广谱性,不仅在鸡源细胞上能够被识别,而且在哺乳细胞上也能被识别。这些结果为REV的基础研究提供了参考。
     5 REV动物感染实验
     将拯救的REV毒株rHLJR0901通过腹腔接种途径感染1日龄SPF雏鸡,进行REV的致病性研究。结果显示:2周龄时REV能够明显影响鸡的生长性能;REV对肝脏、脾脏、胸腺、法氏囊等免疫相关器官均有一定程度的影响;感染后3w时血清开始阳转,但血清抗体阳性率一直是75%;整个实验周期内均可检测到病毒血症。动物感染实验为REV病毒感染模型的建立提供了必要的数据,并提示病毒血症可以作为REV病毒感染模型的稳定指标之一。
Reticuloendotheliosis is an important immunosuppressive and oncogenic disease in avian species. Recently, REV is prevailing in avian in the world. Co-infection of REV with subgroup J avian leukosis virus (ALV-J), Marek’s disease virus (MDV), and chicken anemia virus (CAV) has become endemic in layer and breeder flocks, which induce immunosuppressive and immuno-failure of some important disease (AIV, NDV, et al) so that secondary infection. So it is very difficult to diagnose and control REV. In addition, REV genome can integrate into MDV and fowl poxvirus (FPV) genome and contaminate these commercial vaccines. Besides, the vaccines developed with non SPF embryonated egg are also easy to be contaminated with REV. Now, the threat posed by REV has been got more and more attention. However, the diagnosis, epidemiology and basic research are not consummate. In order to further understand and control RE in a new efficient level, the following experiments were performed in this study.
     1 Development of LAMP assay for REV
     The convenient, specific and sensitive LAMP assay for detecting REV was developed, in which 4 primers aiming at six sites to amplify the pol gene. The REV LAMP assay did not cross react with common avian DNA viruses (MDV, CAV) and ALV-J. Additionally, the assay could detect different REV strains and has a detection limit of 5 copies, which has a 25 times sensitivity than traditional PCR methods. Furthermore, the efficiency of LAMP to detect REV in clinical samples was comparable to traditional PCR. The procedure of LAMP was straight-forward, not rely on any special equipment and performance was simple. The result of LAMP could be observed directly by the unaided eye.
     2 Expression of gp90 protein and development of anti-gp90 monoclonal antibody
     The gp90 gene was amplified by PCR and then cloned into pFastBacHTA, pET-28a (+) , respectively. The donator plamid pF-gp90 of eukaryotic expression and the prokaryotic expression plasmid pET28-gp90 were acquired. The recombinant donor plasmid pF-gp90 was transformed into E coli DH10Bac. The recombinant bacmid plasmid Bacmidgp90 was obtained by integrating gp90 gene into Bacmid vector in DH10Bac cells. The recombinant baculovirus rBacgp90 was obtained after transfecting Sf9 cells. Western blot and IFA showed that the gp90 protein was expressed successfully and its weight was about 45kDa. It has good reactionogenicity. The plasmid pET28-gp90 was transformed into E coli BL21 (DE3) and was induced by IPTG. Analysis by SDS-PAGE and Western blot showed that the gp90 protein was expressed successfully in the form of inclusion body. Then the gp90 protein was purified and immunized to 6-8 weeks Balb/c mice to prepare anti-gp90 serum. The protein has good immunogenicity and the mouse anti-gp90 serum with the ELISA titer of 1:12800 could recognize REV.
     3 Research of RE epidemiology
     Serological survey was performed in nine province. Serum samples were collected from thirty-five layer farms and REV antibody were detected by IDEXX ELISA kit. 89% farms were positive for REV antibody. The positive rate in each farms were 1%-98% and the average positive rate was 15%. These data suggested REV was popular in China and some farms were serious. Grinded and sterilized, the samples were inoculated CEF or DF1 and cultured in 37℃CO_2 incubator for 7 days. Virus was collected and blind passaged. Finally, REV was identificated by indirect immunofluorescence assay (IFA), PCR, electron micrograph. We isolated 10 REV strains from some chicken farm of Heilongjiang, jilin, liaoning, et al. The TCID_(50) of HLJ0901 strain was tittered as 10~(5.2)/mL. With the replication kinetics curve, the regular pattern of HLJR0901 replication in CEF cells was researched: the highest titer of HLJR0901 was observed at 6 and 7 days post-infection. Gp90 gene of fourteen strains, encoding the most important protective protein, was amplification and cloned into pMD-18T vector, then were sequenced and submitted to GenBnak. Six overlapping fragments covering the full-genome of HLJR0901 were cloned and sequenced. The full-genome sequence of HLJR0901 (8284bp) was ascertained. The GenBank accession number is GQ415646. Sequence analysis showed that the LTR of HLJR0901 was completely homologous with FA, and has 99% homology with APC-566. Pol was the most stable gene. The phylogenetic trees of LTR nucleotide, gag amino acids, pol amino acids, gp90 amino acids, env amino acids and the genome displayed a common character:①all the strains was diveided into three distinct branches, which represents three subtypes, respectively.②the northeast REV isolates formed a distinct cluster far from the early Chinese strain HA9901.(subtype I), which derive from different ancestors.③at least two subtypes of REV (subtype I and III) are popular in China, the northeast REV belong to subtype III.④the northeast REV isolates have high similarity with some popular strains in American and Taiwan.
     4 Development and application of the infectious molecular clone of REV
     The full-length genome of the HLJR0901 strain was jointed and cloned in the pBluescript II vector by SOE PCR and restriction enzyme, and the genetic tag C2250G (deleting the MscI site) was introduced. The infectious molecular clone pBlu-mHLJR0901 was constructed. pBlu-mHLJR0901 was transfected and then mind-blinded in CEF cells. With identification of IFA, PCR, sequencing, electron microscope assay, REV could be rescued efficiently. The rescued REV has similar characters of replication and infection. Based on the reverse genetics of REV,the construction of recombinant REV expressing EGFP was performed. EGFP was inserted into the 934 and 7713 nucleotide site of HLJR0901 genome, which was lied in the upper stream before gag gene promoter and the down stream after env gene terminator, respectively. After being transfected into CEF cells, EGFP was transient expressed transient with high performance in the former but not in the later. No recombinant virus was rescued. We also observed that the promoter activity of REV LTR was broad-spectrum not only in chicken cells but also in pig cell. The experiments provide some reference for the basic researches of REV.
     5 Animal experiment of REV
     The REV-infection-animal model with the resued rHLJR0901 was studied preliminarily. Infected 1d SPF chicken, REV could influence the growth and induced a little lesion in liver, spleen, thymus and bursa. Seroconversion was observed at 3w post-infection, but the positive rate was 75% till 8w post-infection. Viremia existed during all experiment period. The experiments provide necessary data for REV-infection-animal model. Viremia will be a stable index for REV-infection-animal model.
引文
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