畜牧兽医学报 ›› 2022, Vol. 53 ›› Issue (4): 1298-1302.doi: 10.11843/j.issn.0366-6964.2022.04.030

• 研究简报 • 上一篇    下一篇

1株鸡传染性喉气管炎病毒的基因组特征与致病性

高昕1, 罗园园1, 杨慧明1,2, 张国中1,2, 赵烨1*   

  1. 1. 中国农业大学动物医学院, 北京 100193;
    2. 中国农业大学畜禽疫病诊断研究中心, 北京 100193
  • 收稿日期:2021-06-29 出版日期:2022-04-23 发布日期:2022-04-25
  • 通讯作者: 赵烨,主要从事畜禽疫病诊断及其致病机制等相关研究,E-mail:yezhao@cau.edu.cn
  • 作者简介:高昕(1999-),女,黑龙江哈尔滨人,本科生,主要从事禽类病原相关研究,E-mail:1037824335@qq.com;罗园园(1999-),女,四川南充人,本科生,主要从事禽类病原相关研究,E-mail:2311071344@qq.com。高昕与罗园园为同等贡献作者
  • 基金资助:
    中国农业大学URP项目

Genomic Characteristics and Pathogenicity of an Avian Infectious Laryngotracheitis Virus

GAO Xin1, LUO Yuanyuan1, YANG Huiming1,2, ZHANG Guozhong1,2, ZHAO Ye1*   

  1. 1. College of Veterinary Medicine, China Agricultural University, Beijing 100193, China;
    2. Diagnosis and Research Center of Livestock and Poultry Diseases, China Agricultural University, Beijing 100193, China
  • Received:2021-06-29 Online:2022-04-23 Published:2022-04-25

摘要: 本研究旨在了解我国鸡传染性喉气管炎病毒(ILTV)流行毒株的分子特性。对1株分离自国内养殖场的鸡传染性喉气管炎病毒毒株BT株进行了部分基因序列(TKICP4、gBUL32)测定分析,并研究了其对2周龄SPF鸡的致病性。遗传进化分析表明,BT株核苷酸序列与国内其他流行毒株相似性在97%以上,属于同一进化分支,未出现较大变异。但其与美国强毒株1874C5和国内标准株WG株等毒株差异较大,主要集中于ICP4基因,在87—90位存在4个氨基酸的缺失(AAQD),该缺失在国内其他分离株中也存在。862—868位存在6个氨基酸的缺失(QPQEPQ),与K317、Serva、Laeyngo和LTBlen等弱毒疫苗株保持一致。将该毒株喉气管内回归接种,未观察到任何鸡死亡,仅有少部分鸡出现结膜分泌物,剖检显示喉头气管正常。提示国内ILTV流行株以较温和的形式在鸡群中流行,并呈现出独特的基因特征。

关键词: 传染性喉气管炎病毒, 序列分析, 致病性

Abstract: This study aimed to understand the molecular characteristics of infectious laryngotracheitis virus (ILTV) in China. TK, ICP4, gB, UL32 gene sequences of ILTV BT strain isolated from domestic farms was determined, and its pathogenicity to 2-week-old SPF chickens was studied. Phylogenetic analysis results showed that the nucleotide sequence of BT strain has a consistency with other epidemic strains in China was more than 97%, which were consisted within one branch and there was no significant variation. However, it is quite different from American virulent strain 1874C5 and domestic standard strain WG, which mainly focuses on ICP4 gene. There is a deletion of 4 amino acids at position 87-90 of (AAQD), which is also found in other domestic isolates. The deletion of (QPQEPQ), with 6 amino acids at position 862-868 was consistent with attenuated vaccine strains such as K317, Serva, Laeyngo and LTBlen. When the strain was inoculated back into the larynx and trachea, no chicken death was observed, only a few chickens showed conjunctival secretion. Autopsy showed that the larynx trachea was normal. It is suggested that domestic ILTV epidemic strains are prevalent in chicken flocks in a mild form and show unique genetic characteristics.

Key words: infectious laryngotracheitis virus, sequence analysis, pathogenicity

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