畜牧兽医学报 ›› 2014, Vol. 45 ›› Issue (2): 255-261.doi: 10.11843/j.issn.0366-6964.2014.02.013

• 预防兽医 • 上一篇    下一篇

鸽源新城疫病毒全基因组序列分析及致病性研究

胡北侠1,杨少华1,张会娟2,伊惠2,张伟2,王莉莉3,许传田1,张琳1,黄庆华1,张秀美1*   

  1. (1.山东省农业科学院畜牧兽医研究所 山东省畜禽疫病防治与繁育重点实验室,济南 250100;2.山东农业大学动物科技学院,泰安 271018;3.山东省微山县畜牧局,微山 277600)
  • 收稿日期:2013-08-22 出版日期:2014-02-23 发布日期:2014-02-23
  • 通讯作者: 张秀美(1956-),女,江苏徐州人,研究员,主要从事禽病综合防控技术研究,E-mail:zxm820410@163.com
  • 作者简介:胡北侠(1974-),女,江苏东海人,硕士,副研究员,主要从事禽病综合防控技术研究,Tel:0531-88970857,E-mail:hubeixia917@sina.com
  • 基金资助:

    公益性行业(农业)科研专项(201003012;201303033);现代农业产业技术体系建设专项资金(CARS-42-Z12)

Complete Genome Sequence Analysis and Pathogenicity of Newcastle Disease Virus Isolated from Pigeons

HU Bei-xia1,YANG Shao-hua1,ZHANG Hui-juan2,YI Hui2,ZHANG Wei2,WANG Li-li3,XU Chuan-tian1,ZHANG Lin1 ,HUANG Qing-hua1,ZHANG Xiu-mei1*   

  1. (1.Shandong Key Lab of Animal Disease Control and Breeding,Institute of Animal Science and Veterinary Medicine,Shandong Academy of Agricultural Sciences, Jinan 250100, China;2.College of Animal Science,Shandong Agricultural University,Tai’an 271018, China;3.Weishan Bureau of Animal Science and Veterinary,Shandong Province,Weishan 277600, China)
  • Received:2013-08-22 Online:2014-02-23 Published:2014-02-23

摘要:

为了科学理解新城疫病毒(NDV)的遗传进化规律,对鸽源NDV基因组和致病特征进行了鉴定分析。从发病鸽群中分离鉴定1株NDV,命名为Pigeon/China/SDLC/2011,并对其进行全基因组测序分析和致病性评价。测序结果显示Pigeon/China/SDLC/2011基因组为15 192 bp,具有NDV强毒株 F蛋白裂解位点112RRQKRF117。遗传进化分析发现Pigeon/China/SDLC/2011属于基因Ⅵ型,其6个结构蛋白氨基酸序列与基因Ⅶ型NDV参考株相比存在不同程度变异,其中P和HN蛋白相似性最低,分别为84.6%~84.8%和90.0%~91.1%。致病性试验结果显示鸽感染后表现瘫痪、翅膀下垂或斜颈等神经症状和排绿色稀粪,病死率为70%~80%;而SPF鸡感染后没有明显的临床症状。试验鸽喉头和泄殖腔病毒检出率明显高于试验鸡。本研究结果显示Pigeon/China/SDLC/2011在分子特性和对SPF鸡致病性方面与基因Ⅶ型NDV存在明显差异。虽然SPF鸡感染Pigeon/China/SDLC/2011后没有发病死亡,但可向体外排毒,因此必须采取有效措施防止鸽源NDV在鸽群和鸡群之间的相互传播。

Abstract:

 The genome and pathogenicity of pigeon NDV isolate were characterized for better understanding the evolution of NDV.A strain of Newcastle disease virus,named Pigeon/China/SDLC/2011,was isolated and identified from diseased pigeon flock.The full-length genome of Pigeon/China/SDLC/2011 was sequenced and compared with reference strains.Besides,the pathogenicity of Pigeon/China/SDLC/2011 was evaluated in pigeons and SPF chickens.Sequence analysis showed that the complete genome of Pigeon/China/SDLC/2011 contained 15 192 nucleotides(nt).The cleavage site of the fusion protein was112RRQKRF117,a feature generally associated with virulent NDV strains.Phylogenetic analysis,based on the genomic sequences and sequences of the fusion gene,revealed that Pigeon/China/SDLC/2011 should be classified as genotype Ⅵ NDV.Mutations were observed in the six structural proteins of Pigeon/China/SDLC/2011 compared with reference NDV strains of genotype Ⅶ.More mutations were localized in the P and HN protein than the other proteins and the amino acid sequence identities of P and HN proteins between Pigeon/China/SDLC/2011 and genotype Ⅶ NDVs was 84.6%-84.8%,90.0%-91.1%,respectively.In the challenge test,70%-80% of pigeons inoculated with Pigeon/China/SDLC/2011 showed a series of nervous disorders:bilateral or unilateral locomotor disturbances of wings or legs,torticollis,and watery green diarrhea and died in 6-14 days.However,chickens remained clinically normal throughout the study.Viruses were detected more frequently in the swabs of pigeons than chickens.The results showed that marked differences in molecular characterization and pathogenicity in chickens were recorded between Pigeon/China/SDLC/2011 and the virulent NDVs of genotype Ⅶ.Although Pigeon/China/SDLC/2011 was nopathogenic for chickens,some measures should be taken to prevent virus transmission between pigeions and chickens as viruses were detected in swabs of infected chickens.

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