实时荧光定量PCR检测VAD1 mRNA评估新型隐球菌性脑膜炎的疗效

目的 建立RT-FQ-PCR检测新型隐球菌VAD1 mRNA的方法 ,探讨定量测定VAD1 mRNA用于CNM疗效评估的可行性.方法 依据GenBank收录的新型隐球菌VAD1 mRNA全序列,设计引物和TaqMan探针,建立RT-FQ-PCR检测VAD1 mRNA的方法 .检测25例CNM患者和30例其他神经系统疾病对照组患者脑脊液,评价方法 的敏感度及特异度;检测25例CNM患者急性期与恢复期脑脊液中VAD1 mRNA的表达量,分析VAD1 mRNA与CNM治疗效果的关系.结果 建立的标准曲线相关系数为-0.997 9,检测下限为101 拷贝数/μl,高、中、低浓度质粒标准品批内CV值分别为0.65%、0.89%和1.23%;RT-FQ-PCR法检测新型隐球菌的敏感度为96%(24/25),特异度为100%(30/30);急性期VAD1 mRNA表达量为3.042±0.906,明显高于恢复期的2.187±0.665,差异有统计学意义(t=4.583,P＜0.01).结论 本研究建立的RT-FQ-PCR方法 具有较高的敏感度、特异度和重复性,适合于新型隐球菌的VAD1 mRNA检测;VAD1 mRNA表达水平与CNM的治疗效果有关.

Evaluation for the treatment efficacy for cryptococcus neoformans meningitis by VAD1 mRNA detection with real-time fluorescent quantitative polymerase chain reaction

Objective To establish a new approach for quantitative detection of VAD1 mRNA in cryptococcus neoformans by RT-FQ-PCR, and evaluate the treatment efficacy of CNM. MethodsThe primers and TaqMan probe were designed according to the published sequence of VAD1 mRNA (GenBank),and RT-FQ-PCR method to detect VAD1 mRNA was established. Cerebrospinal fluid from 25 CNM patients and 30 controls were detected and sensitivity and specificity of the method were evaluated. VAD1 mRNA concentration in cerebrospinal fluid from both acute phase and recovery phase of 25 CNM patients were also detected and significance of CNM treatment efficacy with VAD1 mRNA analysis was evaluated. Results Correlation coefficient of standard curve was - 0. 997 9 in detection of VAD1 mRNA by RT-FQ-PCR, and the detection limit was 101 copies/μl. The intra CV of plasmid standard for high, medium and low concentrations were 0. 65% ,0. 89% and 1.23% respectively, the sensitivity of cryptococcus neoformans detection by RT-FQPCR was 96% (24/25) ,while specificity was 100% (30/30). VAD1 mRNA concentration in acute phase were significant higher than that in recovery phase (3. 042 ±0. 906 vs 2. 187 ±0. 665 ,t =4. 583 ,P ＜0. 01).Conclusions The established RT-FQ-PCR method for the detection of VAD1 mRNA is provided with sound sensitivity, specificity and reproducibility, which might be fit for the detection of VAD1 mRNA. The expression level of VAD1 mRNA is relevant with the treatment efficacy of CNM.