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Construction of a real-time polymerase chain reaction for quantitating thermo-stable-direct-hemolysin gene, an etiological gene-marker of pathogenic Vib-rio parahaemolyticus
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 24
- DOI:
- 10.3321/j.issn:1000-2790.2008.24.008
- Key Word:
- 弧菌,副溶血性;聚合酶链反应;tdh基因
Abstract： 目的:建立一个用于副溶血性弧菌致病性定量测定的检测体系.方法:以多组tdh基因的保守序列为基础,设计实时荧光定量PCR扩增适用的引物和TaqMan探针.以定量方式提取副溶血性弧菌基因组DNA,以tdh+菌株为阳性对照,建立实时荧光定量PCR方法.以tdh荧光定量结果与绝对菌数浓度作参比,以确定tdh基因在菌群中的拷贝水平.结果:使用正向序列5-GGAAG ATGTT TATGG TCAAT C-3(位置在467～487 bp处),反向序列5-ACCGC TGCCA TTG-TA TAGTC T-3(位置在571～551 bp处),TaqMan探针5-FAM-TGACA TCCTA CATGA CTGTG AAC-ECLIPSE-3(位置在517～539 bp处)建立一个实时荧光定馈PCR反应,目的片段长度105 bp.建立反应的DNA拷贝数对数值与Ct值线性关系为γ=-3.144 logx+43.229(r=0.997,P<0.001).建立了菌液A值与显微镜下绝对菌数浓度的相关关系为γ=2.0452x+6.2845(r=0.7828,P<0.01).根据tdh基因拷贝数与绝对菌数相比可计算tdh基因的单菌体拷贝量.结论:建立了一个定量副溶血性弧菌tdh基因拷贝水平的实时荧光定量PCR检测方法,可应用于副溶血性弧菌致病性的标准化定量测定体系.
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