To establish a rapid identification method for common pathogenic bacteria on the basis of molecular biology and to construct a preliminary Polymerase Chain Reaction-Capillary Electrophoresis - Restriction Fragment Len...To establish a rapid identification method for common pathogenic bacteria on the basis of molecular biology and to construct a preliminary Polymerase Chain Reaction-Capillary Electrophoresis - Restriction Fragment Length Polymorphism (PCR-CE-RFLP) database of bacteria isolated from clinical specimens frequently, 183 strains collected from clinical samples belonging to 12 genera and 19 species whose biochemical characterizations corresponded to the typical ones were examined. The genomic DNAs were amplified by two pairs of fluorescence labeled primers aiming at 16S rRNA gene and 16S-23S rRNA spacer region gene respectively at the same time. PCR products were then digested by restriction endonuclease HaeⅢ incompletely before taking capillary electrophoresis. The results with the PCR-CE-RFLP patterns of 16S rRNA genes were just alike within some genera, but when it comes to 16S-23S rRNA spacer region genes, each bacterium showed a unique pattern, which can be distinguished from each other easily. It seems that PCR-CE-RFLP patterns of 16S rRNA gene could only be used to classify the bacteria into family level, whereas the data of 16S-23S rRNA spacer region gene could be utilized to identify the whole microorganisms as precisely as the species level. In spite of the data of the spacer region gene alone can be sufficiently to verify the whole bacteria, we insist that the 16S rRNA gene could be of some assistant in case that there should be lots of families of bacteria, in which some similar ones, with the same RFLP data of 16S-23S rRNA spacer region gene, may coexist. This study proves that the utility of PCR-CE-RFLP is a convenient, rapid method to identify pathogenic bacteria, and is also a quick diagnosis measure for application to clinical use.展开更多
为分离及种属鉴定引起牛乳腺炎相关的链球菌和肠球菌,本研究于兰州及周边地区采集疑似奶牛乳腺炎乳样382份,通过THB(Todd-Hewitt Broth)固体选择培养基初步分离到67株疑似链球菌或疑似肠球菌。参照已发表文献合成链球菌属16S r RNA和16S...为分离及种属鉴定引起牛乳腺炎相关的链球菌和肠球菌,本研究于兰州及周边地区采集疑似奶牛乳腺炎乳样382份,通过THB(Todd-Hewitt Broth)固体选择培养基初步分离到67株疑似链球菌或疑似肠球菌。参照已发表文献合成链球菌属16S r RNA和16S^23S r RNA间隔区基因引物序列,扩增分离菌株16S^23S r RNA间隔区序列,产物分别利用AluⅠ和RsaⅠ单酶切消化,并以参考菌株的16S^23S r RNA酶切图谱为参考,对分离株进行限制性片段多态性(RFLP)分类分析;再选取各RFLP类群的任一菌株,扩增其16S r RNA基因并测序,并经NCBI核酸数据库进行比对,结果显示67株疑似链球菌中有53株为粪肠球菌(79.1%)、3株为屎肠球菌(4.5%)、3株为肠道肠球菌(4.5%)、8株为无乳链球菌(11.9%)。结果表明肠球菌属细菌(粪肠球菌、肠道肠球菌、屎肠球菌)与兰州市及周边地区奶牛乳腺炎的发病紧密相关,肠球菌属细菌与链球菌属细菌16S r RNA基因同源性很高,但可以通过分子生物学方法准确区分。展开更多
文摘To establish a rapid identification method for common pathogenic bacteria on the basis of molecular biology and to construct a preliminary Polymerase Chain Reaction-Capillary Electrophoresis - Restriction Fragment Length Polymorphism (PCR-CE-RFLP) database of bacteria isolated from clinical specimens frequently, 183 strains collected from clinical samples belonging to 12 genera and 19 species whose biochemical characterizations corresponded to the typical ones were examined. The genomic DNAs were amplified by two pairs of fluorescence labeled primers aiming at 16S rRNA gene and 16S-23S rRNA spacer region gene respectively at the same time. PCR products were then digested by restriction endonuclease HaeⅢ incompletely before taking capillary electrophoresis. The results with the PCR-CE-RFLP patterns of 16S rRNA genes were just alike within some genera, but when it comes to 16S-23S rRNA spacer region genes, each bacterium showed a unique pattern, which can be distinguished from each other easily. It seems that PCR-CE-RFLP patterns of 16S rRNA gene could only be used to classify the bacteria into family level, whereas the data of 16S-23S rRNA spacer region gene could be utilized to identify the whole microorganisms as precisely as the species level. In spite of the data of the spacer region gene alone can be sufficiently to verify the whole bacteria, we insist that the 16S rRNA gene could be of some assistant in case that there should be lots of families of bacteria, in which some similar ones, with the same RFLP data of 16S-23S rRNA spacer region gene, may coexist. This study proves that the utility of PCR-CE-RFLP is a convenient, rapid method to identify pathogenic bacteria, and is also a quick diagnosis measure for application to clinical use.
文摘为分离及种属鉴定引起牛乳腺炎相关的链球菌和肠球菌,本研究于兰州及周边地区采集疑似奶牛乳腺炎乳样382份,通过THB(Todd-Hewitt Broth)固体选择培养基初步分离到67株疑似链球菌或疑似肠球菌。参照已发表文献合成链球菌属16S r RNA和16S^23S r RNA间隔区基因引物序列,扩增分离菌株16S^23S r RNA间隔区序列,产物分别利用AluⅠ和RsaⅠ单酶切消化,并以参考菌株的16S^23S r RNA酶切图谱为参考,对分离株进行限制性片段多态性(RFLP)分类分析;再选取各RFLP类群的任一菌株,扩增其16S r RNA基因并测序,并经NCBI核酸数据库进行比对,结果显示67株疑似链球菌中有53株为粪肠球菌(79.1%)、3株为屎肠球菌(4.5%)、3株为肠道肠球菌(4.5%)、8株为无乳链球菌(11.9%)。结果表明肠球菌属细菌(粪肠球菌、肠道肠球菌、屎肠球菌)与兰州市及周边地区奶牛乳腺炎的发病紧密相关,肠球菌属细菌与链球菌属细菌16S r RNA基因同源性很高,但可以通过分子生物学方法准确区分。
