西藏牛羊住肉孢子虫种类鉴别及进化分析
文献类型: 中文期刊
作者: 单曲拉姆;朱传刚;纪荣毅;石斌;唐文强;索朗曲吉;扎西央宗;夏晨阳
作者机构:
关键词: 住肉孢子虫; 线粒体DNA; COX1基因; PCR; 种系发育树
期刊名称:中国草食动物科学
ISSN: 2095-3887
年卷期: 2021 年 41.0 卷 5.0 期
页码:
收录情况: 农林核心(2020版)
摘要: 住肉孢子虫病严重影响畜牧业健康发展,危害肉制品和公共卫生安全。为研究西藏拉萨市临近各县牛羊住肉孢子虫流行情况及虫种鉴定,对西藏拉萨市当雄县和尼木县的牦牛、绵羊、山羊、黄牛、犏牛等共62头(只)牛羊的心肌、膈肌、腿肌、食道肌进行采样。采用压片镜检法对采集的牛羊膈肌进行观察检测,若发现住肉孢子虫包囊即判定为阳性,否则为阴性。采用PCR技术对住肉孢子虫线粒体细胞色素C氧化酶第一亚基(COX1)进行扩增,对62头(只)牛羊的心肌、膈肌、腿肌、食道肌进行检测。结果显示,PCR检测的住肉孢子虫病的阳性率与压片镜检法结果一致,藏牛羊的住肉孢子虫阳性率70.97%;对膈肌PCR产物进行克隆测序,在NCBI上进行同源性比对,共检出4个住肉孢子虫虫种,分别为肉孢子虫(Sarcocystis pilosa)、山羊犬住肉孢子虫(Sarcocystis capracanis)、羊柔嫩住肉孢子虫(Sarcocystis tenella)和家山羊犬肉孢子虫(Sarcocystis hircicanis),对应样品编号分别为5C、17C、19C和27C,其同源性分别为92.10%、99.71%、99.81%和99.26%;种系发育树结果显示,样品5C、17C、19C、27C与其NCBI上同源性最高的住肉孢子虫虫种Sarcocystis pilosa、Sarcocystis capracani、Sarcocystis tenella和Sarcocystis hircicanis处于同一分支上,且系统发育树中的Bootstrap值较高,很好地证明了研究结果中所确定的分类地位,两者确定为同一种属。另外,在牦牛身上检出了Sarcocystis pilosa,为进一步了解Sarcocystis pilosa生活史提供了线索。
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