共查询到20条相似文献，搜索用时 234 毫秒
1.
2.
3.
旨在解析3种不同形态阴门盖捻转血矛线虫（Haemonchus contortus）的遗传进化差异，本研究从养殖场山羊皱胃中分离到捻转血矛线虫虫体，采用普通光学显微镜观察71条雌虫虫体阴门盖的形态结构特征，并基于捻转血矛线虫ITS-1、ITS-2和nad4基因位点，采用PCR法对不同阴门盖的虫体进行扩增，通过比对多位点序列进行遗传进化分析。经显微镜观察发现，本研究分离到的捻转血矛线虫雌虫阴门盖存在舌瓣形、亚球形和舌-球混合形3种形态，所占比例分别为45.07%（32/71）、50.70%（36/71）和4.23%（3/71）。对43条雌虫全长和阴门至虫体末端长度进行测量和统计分析，结果显示，3种不同形态阴门盖的捻转血矛线虫全长统计学差异不显著（P>0.05），而3种不同形态阴门盖的捻转血矛线虫阴门至虫体末端的长度存在显著性差异（P<0.05）。基于捻转血矛线虫ITS-1、ITS-2和nad4基因进行的序列分析结果显示，不同形态阴门盖虫体的9个样品在3个基因位点上存在不同程度的碱基差异，多态性位点分别为10、13和43个，核苷酸多态性分别为0.85%、1.34%和1.97%。基于ITS-1和ITS-2构建的遗传进化树显示，研究中所用样品与GenBank上H.contortus的参考序列处于同一进化支，表明本研究所分离到的虫体均属捻转血矛线虫。捻转血矛线虫雌虫的阴门盖存在形态学差异，不同形态阴门盖虫体在ITS-1、ITS-2和nad4基因位点上均存在不同程度的碱基差异，此研究结果为捻转血矛线虫的种类鉴定和遗传进化提供了参考数据。 相似文献
4.
应用线粒体DNA中的NADH脱氢酶亚基Ⅰ(ND1)基因作为分子标记,对我国甘肃省景泰和平凉地区10个绵羊源脑多头蚴进行分析,构建系统进化树,分析其种内变异.结果表明,所有多头带绦虫(T.multiceps)分离株均成功扩增出约0.5kb的ND1基因片段.序列分析显示,去除引物序列后多头带绦虫的ND1基因片段长为488bp,可以分为9类,共有22个核苷酸变异位点,变异率为0.20%～2.66%.基于ND1序列的系统进化树表明所有T.multiceps分离株构成1个分支,可分为3个亚群,国内分离株分别处在不同的亚群中.国内分离株中除了与已知的遗传变异型Tm1(AY669089/Tm-JT081204/Tm-JT090331)和Tm3(DQ077820/Tm-JT080526)相同外,还存 在新的遗传变异型(Tm-JT081008/Tm-JT090603/Tm-JT090115-2),独立为一支,与其他分离株亲缘关系较远;表明ND1基因片段适合作为研究T.multiceps分离株种内变异的分子标记. 相似文献
5.
6.
《中国畜牧兽医文摘》2012,(3)
<正>日常门诊中常遇到宠物犬的寄生虫病的诊治。借诊治犬病机会,笔者在同事的帮助下,通过临床检查及实验室鉴定,对如皋市部分宠物犬开展了1次犬复孔绦虫调查。调查结果如下。犬复孔绦虫是宠物犬的常见肠道寄生虫,当绦虫虫体在犬体内寄生时,虫体头部的小钩和吸盘叮附在小肠黏膜上吸取机体 相似文献
7.
《中国兽医学报》2016,(4):563-566
本研究旨在对采自大熊猫秦岭亚种(ailuropoda melanoleuca qinlingensis)小肠内的槽盘吸虫进行种类鉴定及遗传进化分析。通过形态学和分子生物学方法,对虫体样本分别进行染色显微镜观察和核糖体DNA内转录间隔区Ⅱ(ITS2)部分序列的PCR扩增和序列分析。经不同染色方法比较后,发现孔雀绿染色法处理后的虫体外部形态以及内部结构清晰,形态上符合印度槽盘吸虫(Ogmocotyle indica)的典型特征;序列及遗传进化分析表明,10个样本ITS2序列完全一致,其系统发生树显示10个样本与O.indica位于同一分枝。研究结果表明,分离的虫株从形态学和进化分析上均与印度槽盘吸虫具有高度一致性,提示该槽盘吸虫为印度槽盘吸虫。 相似文献
8.
9.
为了鉴定天津市某养殖场鲤鱼腹腔内寄生的“面条样”虫体，本试验通过PCR方法扩增虫体的18S rRNA、COⅠ和COB基因序列，并进行分子鉴定和基因测序，分析3种基因的同源性、分子进化和系统发育关系。结果显示，寄生于鲤鱼体内的虫体的18S rRNA、COⅠ和COB基因序列分别与双线绦虫分离株MN204040.1(中国)、MN219466.1(中国)和EU241209.1(法国)的核苷酸序列同源性较高，为99.45%、98.74%和99.26%。基于18S rRNA、COⅠ和COB基因序列构建的系统发育树显示，本试验分离的绦虫裂头蚴与GenBank数据库中已鉴定的双线绦虫聚在同一分支上，且与双线绦虫中国武汉分离株的种属亲缘关系较近。本试验初步阐明获得的天津市双线绦虫分离株与其他种属之间的系统发育关系，为双线绦虫的分子鉴定和系统发育关系分析提供了数据支持。 相似文献
10.
11.
湖南省猬迭宫绦虫的线粒体cox1和nad1基因的序列测定及种系发育分析 总被引：4，自引：1，他引：4
本研究旨在阐明猬迭宫绦虫湖南分离株线粒体细胞色素c氧化酶第I亚基(cox1)基因部分序列(pcox1)和烟酰胺腺嘌呤二核苷酸(NADH)脱氢酶亚单位l基因(nad1)部分序列(pnad1)的遗传变异情况,并用pcox1和pnad1序列重构猬迭宫绦虫与其它绦虫的种群遗传关系。利用聚合酶链反应(PCR)扩增猬迭宫绦虫的pcox1和pnad1,应用ClustalX1.81程序对序列进行比对,再用Phylip3.67程序MP法和Mage4.0程序NJ法绘制种系发育树,并用Puzzle5.2程序构建最大似然树,同时利用DNAStar5.0中的Megalign程序进行同源性分析。结果显示所获得各样品株的pcox1和pnad1序列长度一致,分别为396和566bp,湖南分离株与已知猬迭宫绦虫位于同一分枝。由于猬迭宫绦虫pcox1和pnad1序列种内相对保守,种间差异较大,故均可作为种间遗传变异研究的标记,从而为猬迭宫绦虫的种群体遗传学研究和其相关疾病的诊断奠定基础。 相似文献
12.
本研究选取4头青海牦牛作为研究对象,用2对引物扩增青海牦牛的线粒体细胞色素c氧化酶第1亚基(cox1)基因部分序列(pcox1)和烟酰胺腺嘌呤二核苷酸(NADH)脱氢酶亚单位1基因(nad1)部分序列(pnad1),并用pcox1和pnad1序列重构青海牦牛与其他牛的进化关系。对测定获得序列应用ClustalX 1.81程序进行比对,然后用Phylip 3.67程序MP法,并用Puzzle 5.2程序构建最大似然树。结果表明,所获得的4头牦牛样品pcox1和pnad1基因序列分别为823和837 bp,种系发育分析表明,青海牦牛样品与GenBank已知的牦牛位于同一分支,与其他牛所属分支相隔较远。 相似文献
13.
用犬新孢子虫的重组蛋白GST-NcSAG1t作为ELISA诊断抗原,对青海省乌兰县的部分牧羊犬进行了犬新孢子虫病的血清学调查。经过对所收集的80份牧羊犬血清的检测,共检出犬新孢子虫病阳性血清25份,阳性率为31.25%。结果表明青海省乌兰地区的牧羊犬中存在犬新孢子虫感染。 相似文献
14.
为探究鸡蛔虫的种内遗传变异和系统发育关系,对分离自四川省西昌市的15个鸡蛔虫分离株的线粒体细胞色素c氧化酶第Ⅰ亚基（cox1）基因部分序列和烟酰胺腺嘌呤二核苷酸脱氢酶亚单位Ⅳ（nad4）基因全序列进行PCR扩增、序列测定及分析,并用cox1和nad4基因部分序列构建鸡蛔虫与其他蛔虫的NJ树和贝叶斯树。测序结果显示,所获得的鸡蛔虫cox1和nad4基因全序列长度分别为1 152和1 236 bp,分别有33和40个变异位点,碱基变异率分别为0~2.1%和0~2.3%;分别检测到8和11个单倍型,总的单倍型多样性分别为0.733±0.124和0.933±0.054,核苷酸多样性分别为0.00433±0.00153和0.00541±0.00157,平均遗传距离分别为0.004和0.005。构建的种系发育树均显示15个鸡蛔虫西昌分离株与其他国家/地区的鸡蛔虫分离株聚类形成一个分支,与鸽蛔虫的亲缘关系最近,与其他蛔虫所属的分支相隔较远。研究结果表明鸡蛔虫西昌分离株的遗传变异程度低,且nad4基因比cox1基因更适合作为研究鸡蛔虫分离株遗传变异的分子标记。 相似文献
15.
To study the genetic variations of Ascaridia galli (A. galli) and the phylogentic relationships with other Ascaridata, fragment of the mitochondrial cytochrome c oxidase subunit 1 (cox1) gene and complete sequence of NADH dehydrogenase subunit 4 (nad4) gene of 15 adult A. galli isolated from Xichang city in Sichuan province were amplified by PCR, then analyzed the sequences. NJ trees and Bayes trees based on pcox1 and pnad4 genes were reconstructed. The partial sequences of cox1 gene and complete sequence of nad4 gene were 1 152 and 1 236 bp, respectively. There were 33 and 40 variable sites in the pcox1 and nad4 gene sequences, the intraspecific sequence variations within A. galli were 0 to 2.1% for pcox1 gene, 0 to 2.3% for nad4 gene. 8 and 11 haplotypes were detected in pcox1 and nad4 genes, the global haplotype diversity were 0.733±0.124 and 0.933±0.054, the nucleotide diversities were 0.00433±0.00153 and 0.00541±0.00157, and the average genetic distances were 0.004 and 0.005, respectively. Phylogenetic trees based on pcox1 and pnad4 genes with Neighbour-Joining and Bayesian analysis method revealed that all A. galli were clustered in one clade, and they were more closely related to A. columbae than any other members of Ascaridata. These findings indicated that 15 isolates of A. galli from Xichang city kept low genetic variation, nad4 gene was more suitable and effective than cox1 gene as molecular marker for detecting genetic variation of A. galli. 相似文献
16.
中华双腔吸虫线粒体cox1基因的克隆及序列分析 总被引：1，自引：1，他引：0
以从中国甘肃玛曲牦牛胆管中采集的3条中华双腔吸虫作为研究对象,用引物JB3及JB4.5扩增中华双腔吸虫的线粒体细胞色素c氧化酶第Ⅰ亚基(cox1)基因部分序列(pcox1),并用pcox1序列构建其与其它吸虫的进化关系。将测定获得序列应用Clustal X 1.81程序进行比对,然后用Phylip 3.67程序MP法,并用Puzzle 5.2程序构建最大似然树。所获得的3个中华双腔吸虫样品pcox1序列长度一致,均为355 bp。种系发育分析表明,3个中华双腔吸虫样品位于同一分枝。本研究系首次报道中华双腔吸虫的线粒体cox1序列,从而为进一步研究中华双腔吸虫进一步的分类、鉴定和遗传变异研究奠定了基础。 相似文献
17.
The nutritional programme followed during the growth and development of the German shepherd puppy may have a significant influence on the dog's value as a potential working or breeding animal. Limited research has been undertaken on the nutrition of the dog from birth until four to five weeks of age. The objective of this study was to establish a baseline in terms of food intake and growth, which can be used in a nutritional and managerial programme in a commercial breeding unit. The food intake and growth of 10 German shepherd dog litters, with an average of six puppies per litter, were monitored from birth to 12 weeks of age. Both food intake and growth was described by regression equations. A commercially available diet was fed throughout the study. Performance criteria, namely food intake and bodyweight, were established which could be used in a commercial German shepherd dog breeding unit. 相似文献
18.
Sera were collected from 490 dogs from north-west Italy. One hundred and eighty-eight dogs were urban, while 302 dogs were rural. Among the latter, 190 were shepherd dogs and 112 were cattle farm dogs. Sera were tested for the presence of antibodies against Neospora caninum using the Neospora agglutination test. Seroprevalence at 1/40, 1/80, 1/160 dilution titres was significantly higher in rural (36.4%, 19.5%, 9.9% respectively) than in urban dogs (20.2%, 10.6%, 4.8% respectively). Seroprevalence did not differ significantly in males and females. In shepherd dogs, prevalence increased according to dogs' age, thus suggesting a post-natal exposure by horizontal transmission. The observed higher seroprevalence in rural dogs suggests the importance of lifestyle and alimentary habits (i.e. aborted foetuses, placentas and small mammals) in the acquisition of N. caninum infection. Our results confirm that dogs are exposed to N. caninum and play an important role in the epidemiology of N. caninum. 相似文献
19.
Václavek P Sedlák K Hůrková L Vodrázka P Sebesta R Koudela B 《Veterinary parasitology》2007,143(1):35-41
The main aim of the present study was to establish the prevalence of antibodies against Neospora caninum dogs from the Czech Republic and to examine the dynamics of antibody titers during a long-term period. For this purpose, sera of 858 dogs were examined for the presence of anti-N. caninum antibodies using an indirect immunofluorescent antibody test (IFAT). Four groups of dogs of various origins were included in the survey: the first group (A, n=470) comprised dogs purchased by the Czech Army from the civilian sector throughout the Czech Republic, with 22 (4.7%) N. caninum-positive dogs, second group (B, n=115) represented police dogs with no seropositive animal, third group (C, n=195) were pet dog sera collected for veterinary clinic with 5 (2.6%) anti-N. caninum sera and the fourth group (D, n=78) of canine shelter dogs with the seroprevalence of 19.2%. The differences in seroprevalence were significant (P< or =0.01) between groups B and A, and between D and A. None of the serologically positive animals had clinical signs of neurological disorders. Coprological examination did not reveal any dog shedding N. caninum oocysts. The seropositivity rates for N. caninum were analyzed in relation to other data, such as age, breed and gender. Increased prevalence rates of anti-N. caninum antibodies were found in the older age strata of the dog population sample tested in the present study. We found significantly higher (P=0.02) prevalence in 3-3.5-year-old dogs (11.1% of 36), as compared to 1-1.5-years-old dogs (2% of 98). A longitudinal study of antibody dynamics was carried out in 19 initially seropositive dogs over a period of 4 years. The second and third examinations revealed that antibody titers decreased in majority of positive dogs (10, 52.6%), of which in seven cases (36.8%) the titers fell to levels that are currently considered as being seronegative (titer <1:50), or even became undetectable (titer <1:25). 相似文献
20.
为研究长沙市黑斑蛙蛔虫分离株的线粒体DNA pcox1序列的遗传变异情况,并分析黑斑蛙蛔虫cox1部分序列与其它蛔虫的种群遗传关系。利用PCR扩增黑斑蛙蛔虫mtDNA的pcox1片段,将PCR扩增出的片段纯化后测序,并对其序列进行分析。结果显示所获得的4株cox1序列长度存在一定差异,为400～410 bp。由于黑斑蛙蛔虫cox1序列种内相对保守,种间差异较大,故可作为种间遗传变异研究的分子标记。本研究报道的黑斑蛙蛔虫cox1序列,为黑斑蛙蛔虫的分类鉴定以及进一步的分子流行病学调查和群体遗传研究奠定了基础。 相似文献