中国农业科学 ›› 2023, Vol. 56 ›› Issue (6): 1204-1214.doi: 10.3864/j.issn.0578-1752.2023.06.015

• 畜牧·兽医 • 上一篇    

内蒙古地区羊源副结核分枝杆菌的分离与基因分型

赵维宏1(), 韩文雄2, 杨波3, 孟维康1, 柴海亮1, 马懿敏1, 张占胜1, 王利峰1, 王艳1, 王明圆1, 张姗1, 丁玉林1, 王金玲1, 吉林台1, 王凤龙1, 赵丽1(), 刘永宏1()   

  1. 1 内蒙古农业大学兽医学院/农业农村部动物疾病临床诊疗技术重点实验室,呼和浩特 010000
    2 内蒙古赛科星繁育生物技术(集团)股份有限公司,呼和浩特 011517
    3 鄂尔多斯市动物疫病预防控制中心,内蒙古鄂尔多斯 017000
  • 收稿日期:2021-11-11 接受日期:2022-08-30 出版日期:2023-03-16 发布日期:2023-03-23
  • 联系方式: 赵维宏,E-mail:zhaoweihong@foxmail.com。
  • 基金资助:
    国家自然科学基金(31860698); 内蒙古农业大学高层次人才科研启动金项目(NDYB2019-3); 内蒙古农业大学高层次人才科研启动金项目(NDYB2018-5)

Isolation and Genotyping of Mycobacterium avium subsp. paratuberculosis from Sheep in Inner Mongolia

ZHAO WeiHong1(), HAN WenXiong2, YANG Bo3, MENG WeiKang1, CHAI HaiLiang1, MA YiMin1, ZHANG ZhanSheng1, WANG LiFeng1, WANG Yan1, WANG MingYuan1, ZHANG Shan1, DING YuLin1, WANG JinLing1, JIRINTAI Sulijid1, WANG FengLong1, ZHAO Li1(), LIU YongHong1()   

  1. 1 College of Veterinary Medicine, Inner Mongolia Agricultural University/Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Disease, Ministry of Agriculture and Rural Affairs, Hohhot 010000
    2 Inner Mongolia Saikexing Reproductive Biotechnology (Group) Co.,Ltd., Hohhot, 011517
    3 Animal Disease Control Center of Ordos, Ordos 017000, Inner Mongolia
  • Received:2021-11-11 Accepted:2022-08-30 Published:2023-03-16 Online:2023-03-23

摘要:

【目的】副结核病被世界动物卫生组织(OIE)列入必须报告的《OIE疫病、感染及侵染名录》,我国将其列为二类动物疫病,引起多种反刍动物慢性、增生性肠炎,感染动物通过肠道间歇性排菌而成为养殖场的持续传染源,给养殖业带来了巨大经济损失。其病原体副结核分枝杆菌(MAP)属于胞内寄生的革兰氏阳性菌,为三类动物病原微生物,包括S型(羊型,细分为Ⅰ型、Ⅲ型和骆驼型)和C型(牛型、Ⅱ型,包括B型(野牛型))。有研究表明,各亚型MAP无宿主特异性,但具有地域性,内蒙古作为国内该病的首发地区,获得并准确鉴定内蒙古地区MAP菌株亚型及基因特征,对副结核病的预防控制意义重大。【方法】对内蒙古地区来源的28份MAP阳性的羊源病料进行MAP分离培养,菌落Ziehl-Neelsen染色,染色阳性菌扩繁,提取扩繁菌液基因组DNA,进行IS900基因、IS1311基因和DMC基因扩增、测序和序列分析,同时IS1311基因PCR产物进行Hinf I和Mse I双酶切鉴定。【结果】28份样品经过7—12周培养,共有9支培养基长出菌落,菌落半透明乳白色、表面光滑。挑取单菌落进行抗酸染色,在显微镜下观察到呈不规则(单个或分枝状)、红染的细短杆菌,符合分枝杆菌的形态学特征及抗酸染色特性。9株分离菌IS900、IS1311和DMC基因PCR扩增产物均与目的基因片段预期大小一致。确定了本研究9株分离株均为MAP菌株,分别命名为MAP-NM1至MAP-NM9。DMC基因扩增产物大小为310bp,符合Ⅱ型MAP特征;IS1311基因扩增产物经Hinf Ⅰ和Mse Ⅰ双酶切,本研究9株MAP均得到4条目的条带,与Ⅱ型MAP一致;IS1311基因测序结果与S型、C型、印度野牛型和美国野牛型MAP代表株对照分析显示,9株MAP IS1311基因片段的64、65、68、223、236、422、527、628位碱基位点符合C型和B型MAP特征;IS900基因测序结果序列分析显示,9株MAP IS900基因片段第169位及第216位碱基分别为C(胞嘧啶)和A(腺嘌呤),符合Ⅱ型和Ⅲ型MAP特征;17株来自GenBank数据库的MAP IS900基因参考序列与本研究9株分离株IS900基因系统进化树显示,本研究9株MAP均划分于Ⅱ型MAP分支;3个基因测序结果进行Blast在线分析,与本研究所得分离株同源性最高的参考序列均为Ⅱ型MAP,且同源性均高于98%。综上所述,本研究9株MAP分离株均为Ⅱ型MAP。【结论】首次分离得到内蒙古地区羊源Ⅱ型MAP菌株。

关键词: 副结核分枝杆菌, 分离培养, 亚型鉴定, 羊, 内蒙古

Abstract:

【Objective】 Paratuberculosis is listed in the must-report at the list of “World Organization for Animal Health (OIE) diseases, infections and Invasion” by OIE. It is classified as the second kind of animal disease in China. It causes chronic and proliferative enteritis in many ruminants. The infected animals become a continuous source of infection in farms through intestinal intermittent excretion, which has brought great economic losses to aquaculture. The pathogen of Mycobacterium avium subsp. paratuberculosis (MAP) belongs to intracellular parasitic Gram-positive bacteria, and is a third group of zoological pathogenic microorganisms, including type C (also designated as type II) and type S. Type C also includes type B. Type S can be further subdivided into sub-group types I and III. And sub-lineages of camelid isolates Studies have shown that each subtype of MAP has no host specificity, but is regional. Inner Mongolia is the first region of the disease in China. It is of great significance to obtain and accurately identify the subtype and genetic characteristics of MAP strains in Inner Mongolia for the prevention and control of paratuberculosis. 【Method】 28 MAP-positive sheep disease samples collected in Inner Mongolia were isolated and cultured by MAP, and the colonies were stained with Ziehl-Neelsen. The positive bacteria were propagated and the genomic DNA was extracted. IS900 gene, IS1311 gene and DMC gene were amplified, sequenced, and analyzed. The PCR products of IS1311 gene were identified by Hinf I and Mse I double digestion. 【Result】 28 samples were cultured for 7- 2 weeks, a total of 9 mediums grew colonies, and the colonies were translucent milky white smooth surface. Single colonies were selected for acid-fast staining, and irregular (single or branched), red-stained Brevibacterium was observed under the microscope, which was consistent with the morphological characteristics and acid-fast staining characteristics of Mycobacterium. The PCR products of IS900, IS1311 and DMC genes of 9 isolates were consistent with the expected size of the target gene fragment. 9 isolates were identified as MAP strains, named MAP-NM1 to MAP-NM9. DMC gene amplification product size of 310bp, which was consistent with type II MAP characteristics. IS1311 gene amplification products were digested by Hinf I and Mse I restriction endonucleases, and 4 target bands were obtained in 9 strains of MAP, which were consistent with type II MAP. The sequencing results of IS1311 gene and the analysis of MAP representative strains of type I, type II, type III, Indian Buffalo and American Buffalo showed that the nucleotide sites at positions 64, 65, 68, 223, 236, 422, 527 and 628 of the nine MAP IS1311 gene fragments were conformed to the characteristics of type C and type B MAP. Sequence analysis of IS900 gene sequencing results showed that the 169th and 216th nucleotides of the nine MAP IS900 gene fragments were C (cytosine) and A (adenine), and accorded with Type II and type III MAP. The phylogenetic tree of 17 MAP IS900 gene reference sequences from GenBank database with 9 isolates in this study showed that the 9 isolates in this study were all in the type II MAP branch. Blast online analysis was performed on the sequencing results of the three genes. The reference sequences with the highest homology with the isolates obtained in this study were all type II MAP, and the homology was higher than 98%. In conclusion, all the 9 MAP isolates were type II MAP. 【Conclusion】 To the best of our knowledge, this was the first isolate of the MAP type Ⅱ strains in sheep in Inner Mongolia.

Key words: Mycobacterium avium subsp. paratuberculosis, isolated, typing, sheep, Inner Mongolia