Yang Deying, Ren Yongjun, Fu Yan, Xie Yue, Nie Huaming, Nong Xiang, Gu Xiaobin, Wang Shuxian, Peng Xuerong, Yang Guangyou
Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an 625014, China.
Korean J Parasitol. 2013 Aug;51(4):449-52. doi: 10.3347/kjp.2013.51.4.449. Epub 2013 Aug 30.
Taenia pisiformis is one of the most important parasites of canines and rabbits. T. pisiformis cysticercus (the larval stage) causes severe damage to rabbit breeding, which results in huge economic losses. In this study, the genetic variation of T. pisiformis was determined in Sichuan Province, China. Fragments of the mitochondrial cytochrome b (cytb) (922 bp) gene were amplified in 53 isolates from 8 regions of T. pisiformis. Overall, 12 haplotypes were found in these 53 cytb sequences. Molecular genetic variations showed 98.4% genetic variation derived from intra-region. FST and Nm values suggested that 53 isolates were not genetically differentiated and had low levels of genetic diversity. Neutrality indices of the cytb sequences showed the evolution of T. pisiformis followed a neutral mode. Phylogenetic analysis revealed no correlation between phylogeny and geographic distribution. These findings indicate that 53 isolates of T. pisiformis keep a low genetic variation, which provide useful knowledge for monitoring changes in parasite populations for future control strategies.
豆状带绦虫是犬类和兔子最重要的寄生虫之一。豆状带绦虫囊尾蚴(幼虫阶段)对兔子养殖造成严重损害,导致巨大的经济损失。在本研究中,对中国四川省的豆状带绦虫的遗传变异进行了测定。从豆状带绦虫8个地区的53个分离株中扩增出线粒体细胞色素b(cytb)(922 bp)基因片段。总体而言,在这53个cytb序列中发现了12种单倍型。分子遗传变异表明,98.4%的遗传变异来自区域内。FST和Nm值表明53个分离株没有遗传分化,遗传多样性水平较低。cytb序列的中性指数表明豆状带绦虫的进化遵循中性模式。系统发育分析表明系统发育与地理分布之间没有相关性。这些发现表明,53个豆状带绦虫分离株的遗传变异较低,这为监测寄生虫种群变化以制定未来的控制策略提供了有用的知识。