青海省高原鼠兔源囊尾蚴的分子鉴定与进化分析
陈澳 , 张海宁 , 李志 , 孟茹 , 张学勇 , 付永
中国农业大学学报 ›› 2025, Vol. 30 ›› Issue (2) : 107 -114.
青海省高原鼠兔源囊尾蚴的分子鉴定与进化分析
Molecular identification and evolutionary analysis of cysticercus derived from Ochotona curzoniae in Qinghai Province
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为鉴定青海省高原鼠兔源绦虫囊尾蚴种类,本研究对囊尾蚴样本进行体式显微镜观察,对其线粒体COI基因进行扩增并测序比对分析,同时利用Iqtree和BEAST v2.6.2等软件对测序所得的COI基因进行系统发育及分化时间分析。结果表明:1)体式显微镜下该囊尾蚴的形态特征与带科囊尾蚴相似。2)测序结果发现该序列与GenBank中的才氏绦虫(Taenia caixuepengi)基因序列(MT882036)同源,序列相似性达到98.52%,表明该囊尾蚴属于Taenia caixuepengi囊尾蚴。3)系统发育树显示,才氏囊尾蚴与和豆状带绦虫(T. pisiformis)亲缘关系最近,两者形成微小分支。4)分化时间分析表明才氏囊尾蚴与豆状带绦虫在5.79 Mya(95%置信区间,3.15~6.87 Mya)左右分化形成,自展值为100%。综上,经鉴定青海省高原鼠兔源囊尾蚴为才氏囊尾蚴;利用该囊尾蚴线粒体COI基因进行的系统发育及分化时间分析表明该囊尾蚴与豆状带绦虫亲缘关系更近。本研究对青海省高原鼠兔源才氏囊尾蚴进行了鉴定与遗传进化分析,为才氏绦虫的分类、鉴定及分子流行病学调查提供理论依据。
To identify the species of cysticercus derived from Ochotona curzoniae in Qinghai Province, the cysticercus samples were observed under a somatic microscopy, the mitochondrial COI gene sequences of cysticercus samples were amplified and sequenced, and the amplified products were compared. At the same time, the phylogeny and differentiation time of the sequenced COI genes were analyzed by Iqtree, BEAST v2.6.2 and other software. The results showed as follows: 1) The morphological characteristics of the cysticercus were similar to those of Taeniidae cysticercus in the family Ceratopsidae. 2) The sequencing results showed that the sequence was homologous to the gene sequence of Taenia caixuepengi in GenBank (MT882036), with a sequence similarity of 98.52%, indicating that the cysticercus belongs to Taenia caixuepngi. 3) The phylogenetic tree showed that T. pisiformis was closely related to T. pisiformis, forming small branches between the two. 4) The differentiation time analysis showed that T. caixuepengi and T. pisiformis differentiated at around 5.79Mya (95% confidence interval, 3.15-6.87 Mya) with a bootstrap value of 100%. In conclusion, the cysticercus derived from O. curzoniae in Qinghai Province was identified as T. caixuepengi. Phylogenetic analysis and differentiation time analysis using the mitochondrial COI gene of this cysticercus showed that this cysticercus was more closely related to T. pisiformis. In this study, the identification and genetic evolution analysis were performed to provide theoretical basis for the classification, identification and molecular epidemiological investigation of T. caixuepengi in Qinghai province.
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国家自然科学基金项目(32160840)
青海省“昆仑英才·高端创新创业人才”项目
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