基于COI与18S rRNA基因序列的4种肉食螨DNA条形码研究

目的　基于线粒体细胞色素C氧化酶亚基I（COI）与核糖体18S小亚基（18S rRNA）基因序列,分析确定4种肉食螨合适的DNA条形码,从而进一步完善肉食螨DNA条形码数据库。方法　2018年5月—2019年7月于安徽省阜阳、芜湖、铜陵等3市小型面粉作坊采集分离肉食螨样本,经形态学鉴定后,提取单个螨基因组DNA,经PCR扩增、克隆和测序获得COI与18S rRNA基因序列,所获序列进行BLAST比对。结合已报道肉食螨序列,用ClustalX 1.83软件进行多序列比对,基于MEGA X软件进行序列分析并计算遗传距离,采用最大似然法构建系统发育树。结果　马六甲肉食螨、转开肉食螨、鳞翅触足螨分子鉴定结果与形态学一致,而GenBank中缺少网真扇毛螨相关序列。4种肉食螨COI与18S rRNA 基因序列（A + T）分别为69.6%和55.1%,碱基替换数分别为137对和46对。基于COI与18S rRNA基因序列变异位点分析,发现4种肉食螨种间变异位点分别为154 ~ 321个和58 ~ 99个。4种肉食螨COI与18S rRNA基因序列种内遗传距离均≤ 0.020,种间遗传距离分别为0.235 ~ 0.583和0.078 ~ 0.114。基于COI与18S rRNA基因序列的系统发育树显示,4种肉食螨均能各自聚为一支,支持率均达100%,与形态学鉴定结果一致。结论　线粒体COI基因序列作为4种肉食螨DNA条形码优于18S rRNA基因序列,更适用于探索肉食螨的属、种低阶元亲缘关系。     

基于18S和28S rDNA基因的房舍甲螨DNA条形码比较研究

目的 比较18S和28S rDNA基因应用于房舍甲螨物种鉴定的有效性及适用性。方法 2021年2—10月在安徽省部分地区（亳州、阜阳、淮南、滁州、合肥、芜湖、铜陵、安庆和黄山等9市）的居室、农舍及仓储等房舍采集灰尘并分离甲螨,利用形态学特征鉴定螨种,提取单只甲螨基因组DNA, PCR扩增甲螨18S rDNA, 28S rDNA D3和D8基因片段并测序。从GenBank下载房舍甲螨基因序列,用MEGA X软件进行序列特征分析和遗传距离计算,并通过ABGD网站进行DNA条形码间隙分析。采用邻接法构建甲螨的系统进化树。结果共采集甲螨53只,经形态学鉴定属于3科5属5种,分别为滑菌甲螨（15只）、盛若甲螨（9只）、新小奥甲螨（10只）、棒梳枝奥甲螨（10只）和间新美奥甲螨（9只）。从该5种甲螨扩增获得18S rDNA、 28S rDNA D3和D8基因单倍型分别为7、 5和11条;从GenBank中共下载房舍甲螨序列42条。序列分析结果显示,18S rDNA、 28S rDNA D3和D8基因长度分别为442～590、 247～331、 270～283 bp, GC含量分别为45.6%、52...     

基于18S rRNA基因的芜湖市疟疾病例溯源研究

目的 研究芜湖市疟疾病例疟原虫种系发育和地理聚类.方法 采集2018年8月至2019年9月皖南医学院附属弋矶山医院收治的4例疟疾患者血样,提取血样疟原虫DNA,采用巢式PCR技术对其18S rRNA基因进行扩增、克隆测序分析,并与GenBank中疟原虫相应序列进行比较分析,采用MEGA X软件建树,运用分子进化树分析芜...     

基氏蠊螨的 18S rDNA 分子鉴定

目的 基于核糖体 18S rDNA 基因对基氏蠊螨进行分子鉴定。 方法 采集和分离储藏物样本,进行螨类的形态学鉴定。 提取单个螨的基因组 DNA,经 PCR 扩增、克隆和测序获得 COⅠ基因和 18S rDNA 基因,将所获序列进行 Blast 对比。 检索 GenBank 数据库中蠊螨属 18S rDNA 基因序列,利用 Clustal X 1. 83 软件进行多序列比对,基于MEGA X 软件进行序列分析并以邻接法(Neighbor-Joining,NJ)构建系统发育树。 结果 采集的样本经形态和 COⅠ基因双重鉴定为基氏蠊螨。 同时,所选取的 10 个基氏蠊螨的 18S rDNA 基因序列完全一致,均表现出 A / T 碱基偏向性,与同属的 Blattisocius tarsalis 和 Blattisocius everti 分别有 98. 73%和 98. 94%的同源性。 基于 18S rDNA 基因序列的系统进化树显示,基氏蠊螨与 Blattisocius tarsalis 和 Blattisocius everti 聚为一支。 结论 本研究建立了基氏蠊螨基于 18S rDNA 基因序列的分子鉴定方法,为基氏蠊螨的准确鉴定奠定基础。     

腔阔盘吸虫18S rRNA及亲缘关系分析

目的 利用分子生物学技术，研究腔阔盘吸虫的分类。 方法 提取腔阔盘吸虫基因组DNA，利用保守引物，PCR扩增18S rRNA片段并测序。应用DNAStar和MEGA3软件，分析腔阔盘吸虫与其他双腔吸虫18S rRNA的同源性，在此基础上绘制出系统进化树，确定它们的进化关系。 结果 腔阔盘吸虫和其他双腔吸虫18S rRNA的同源性很高，其中腔阔盘吸虫和支双腔吸虫（D. dendriticum）的差异最大，为2.42%，而与愁体吸虫（L. collurionis）的差异较小，为1.75%; D. dendriticum和分叶短腺吸虫（B. lobatum）的进化关系相对较近，差异为1.09%。 结论 双腔科吸虫的18S rRNA序列非常保守，腔阔盘吸虫和L. collurionis的亲缘关系最近，而与B. lobatum和D. dendriticum在进化上关系相对较远。     

湖南省怀化地区山羊胰阔盘吸虫线粒体pcox1基因和核糖体18S rRNA基因序列遗传变异研究

目的　了解湖南省怀化地区山羊体内分离的胰阔盘吸虫遗传变异情况。方法　应用PCR技术对分离自湖南怀化地区山羊体内的18株胰阔盘吸虫分离株线粒体细胞色素c氧化酶亚基I基因部分序列（pcox1）和核糖体18S rRNA基因进行扩增,对扩增产物进行测序并进行遗传变异和系统发育分析。结果　分离自湖南怀化地区山羊体内的18株胰阔盘吸虫分离株pcox1和18S rRNA基因序列长度分别为430 bp和1 857 bp,分别存在14个和35个变异位点,种内遗传差异分别为0 ~ 1.4%和0 ~ 0.8%;与GenBank数据库中收录的胰阔盘吸虫中国株基因序列同源性最高,分别为99.0% ~ 99.8%和99.5% ~ 99.8%。基于两种基因构建的系统发育树分析结果一致,本研究获得的18株胰阔盘吸虫分离株与GenBank数据库中已知胰阔盘吸虫分离株聚为同一分支,与支睾阔盘吸虫等阔盘属吸虫相隔较近,与其他吸虫所属分支相隔较远。结论　湖南省怀化地区山羊源胰阔盘吸虫分离株遗传变异度较低,线粒体pcox1基因和核糖体18S rRNA基因均适合作为羊源胰阔盘吸虫遗传变异研究的分子标记。     

应用16S rRNA基因序列分析技术鉴定临床非典型细菌的研究北大核心CSCD

目的将16SrRNA基因序列分析技术应用于传统方法鉴定可靠率低或无法鉴定细菌的分类鉴定,以提高临床诊断的准确性。方法以本院微生物实验室保存的5株标准菌株验证实验方法的准确性后,收集实验室常规方法不能鉴定或鉴定可靠性低的临床分离菌15株(包括革兰阳性球菌,革兰阳性杆菌及革兰阴性杆菌),提取DNA模板,以通用引物PCR扩增16SrRNA目的片段后测序,将测序结果在GenBank数据库中比对分析以确定菌种。结果 15株实验细菌中有14株(占93.3%)鉴定到种,包括鼻疽诺卡菌,大肠埃希菌,阿尔莱特葡萄球菌,脆弱拟杆菌,弗氏柠檬酸杆菌,短小芽孢杆菌,河流漫游球菌,极小短小杆菌,伴放线凝聚杆菌,毗邻颗粒球菌;1株菌鉴定到属(占6.7%),归属于短状杆菌属。结论 16SrRNA基因序列分析技术具有准确、快速和方法简便的特点,适用于对临床非典型菌、少见菌以及新型细菌的鉴定,可作为细菌常规鉴定手段的必要补充。     

分支杆菌临床分离株的16S rRNA基因序列分析

目的　建立分支杆菌的 16SrDNA序列分析的方法 ,采用该方法鉴定临床结核分支杆菌分离株。方法　用PCR从重庆某医院的肺部感染病人的痰标本中分得的 2 9株分支杆菌菌株中扩增 16SrRNA基因 (16SrDNA)的 5′端片段 (～5 0 0bp) ,并测定所得到片段的DNA序列。用DNA分析软件将所获得的序列与GenBank的分支杆菌序列相比较 ,计算种间相似性 ,并用序列构建分支杆菌菌株的系统发育树 ,对分离株进行分类与鉴定。结果　有 14株的 16SrDNA序列分别与已知结核分支杆菌复合群 (Mycobacteriatuberculosiscomplex ,MTC)、戈登分支杆菌、新金色分支杆菌、氯酚红分支杆菌、龟分支杆菌或脓肿分支杆菌的序列完全相同。依据完全一致的序列可以准确鉴定这些临床分离株为相应的种 ;部分分离株的 16SrDNA在GenBank序列检索中无完全一致的匹配序列。用临床分离株的 16SrDNA序列与已知的分支杆菌 16SrDNA序列构建的系统发育树 ,结果提示某些菌株可能是与已知分支杆菌密切相关的新种或是它们的亚种。结论　 16SrDNA序列分析鉴定分支杆菌是一种快速、可靠、成本较低的方法 ;重庆地区非结核分支杆菌感染的种类与其它地区的报告有明显不同     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

目的 建立16S rRNA基因克隆文库分析蜱媒菌群的方法,观察该方法对蜱寄生病原菌的检测效率以及对细菌群落多样性分析和对病原菌的筛检能力.方法 用伯氏疏螺旋体、汉赛巴通体、嗜吞噬细胞无形体和查菲埃立克体4种病原菌特异基因设计引物,扩增蜱标本提取的核酸,以上述4种病原菌特异基因片段扩增均阳性的蜱核酸提取物做模板,用16S rRNA基因的通用引物进行PCR扩增、纯化、连接、克隆和测序,建立16S rRNA基因克隆文库,将测序结果与数据库进行比对,计算克隆文库Coverage值和Shannon-Wiener多样性指数.结果 测出103个有效序列,检出16种已知种属的细菌,其中8个是优势类型(克隆子数>5个);检测到伯氏疏螺旋体、汉赛巴通体和立克次体3种病原菌,但这3种病原菌均不是优势类型(克隆子数均<5个).Coverage值为96.11%,Shannon-Wiener多样性指数为2.40.克隆序列分析结果表明,蜱寄生细菌主要为α、γ变形菌纲,占56.25%(9/16).结论 16S rRNA基因序列分析可以对蜱标本进行菌群相对定量研究,可以同时检出多种病原菌,是一种较好的细菌菌群多样性分析和病原菌筛检方法.     

福建华溪蟹线粒体DNA COI和16S rRNA基因序列的遗传多样性

目的 探讨福建华溪蟹(Sinopotamonfukienense)的遗传多样性.方法 采用PCR结合DNA测序技术,测定S.fukienense的线粒体COI和16S rRNA基因序列的组成.经比对获得639 bp长度的COI基因序列和526 bp的16S rRNA基因序列,以对比分析S.fukienense的遗传多样性.结果 S.fukienense基于COI基因核苷酸多样性(Pi)为0.048 4,高于其基于16S rRNA基因核苷酸多样性(Pi)为0.021 6.同时,S.fukienense基于COI基因单倍型间的平均遗传距离(P)为0.048,大于其基于16S rRNA基因单倍型间的平均遗传距离(P)0.026.结论 COI序列在分析S.fukienense遗传异变时的作用更优于16S rRNA基因序列.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.     

4种病原菌特异基因片段阳性蜱的16S rRNA基因克隆文库分析

Objective To develop the method of 16S rRNA gene clone library for tick bacterial flora analysis, and to analyze the detection effective of pathogens in tick and capacity of bacterial flora diversity. Methods Primers were designed according to the specific gene of Borrelia burgdorferi, Bartonella henselae, Anaplasma phagocytophilum, Ehrlichia chaffeensis and templates were choosen by positive PCR result to amplify the DNA extracted from the ticks. One set of primers targeting 16S rRNA gene conserved region were chosen to amplify certain fragments, DNA extraction, PCR reaction, cloning and sequencing. Nucleotide sequences were compared with GenBank database. Calculated Coverage values of clone library and Shannon-Wiener diversity index. Results Sixteen defined genus-or species-bacteria were detected in 103 valid sequences. Eight species were edge type (Clone No. > 5). Three kinds of pathogens were identified (Borrelia burgdorferi, Bartonella henselae and Rickettsia sp). Three kinds of pathogens were not edge type(Clone No. < 5). Coverage value was 96.11%, and Shannon-Wiener index was 2.40. Analysis results of cloning sequence showed that tick-parasitic bacteria mainly were α and γ deformation mycetes which accounted for 56.25% (9/16). Conclusions The 16S rRNA gene sequences technology could make relative quantitative of bacterial flora, and detect many kinds of pathogens in tick. It's a good method for detection of pathogens and bacterial flora analysis.