Establishment of Fluorescence Quantitative RT-PCR Assay for Detection of Equine Arteritis Virus

[Objective]The paper was to establish a fluorescence quantitative RT-PCR method for detection of equine arteritis virus(EAV).[Method]Primers and probes were developed for the EAV ORF7 gene sequence,and the reaction system was optimized.Standard curves were established,leading to the initial development of the EAV fluorescence quantitative RT-PCR assay.The accuracy,specificity,and sensitivity of this method were subsequently evaluated.[Result]The EAV fluorescence quantitative RT-PCR assay demonstrated optimal performance at an annealing temperature of 61 C,with a final concentration of primer and probe set at 0.6μmol/L.The plasmid standard demonstrated a strong linear correlation with Ct values within the range of 1.6×10^(7)-1.6×10^(2)copies/μL.The equation of the standard curve was determined to be y=-2.68x+32.88,with an R^(2) value of 0.9927.Consequently,the EAV fluorescence quantitative RT-PCR assay was successfully established.The methodology employed was effective in detecting EAV,Theileria equi,equine herpesvirus-1(EHV-1),equine herpesvirus-4(EHV-4),and equine influenza virus(EIV).The findings indicated that the method was specifically capable of detecting EAV,while the other pathogens tested yielded negative results.The method demonstrated a high degree of specificity.It was employed to detect the standard plasmid cRNA synthesized through in vitro transcription following a 10-fold dilution.The results indicated that the minimum detection limit of the method was 1.6×10^(2) copies/μL,and it exhibited high sensitivity.The coefficient of variation,both within and between groups,was maintained at 1.8%,indicating good reproducibility.In this study,the fluorescence quantitative RT-PCR assay developed was utilized alongside the EAV fluorescence quantitative RT-PCR assay established by previous researchers to analyze a total of 234 clinical samples.Both methods yielded a positive detection rate of 14.1%,and the coincidence rate between the two techniques was found to be 100%.[Conclusion]The fluorescence quantitative RT-PCR assay developed in this study offers a novel approach and concept for the prevention and control of equine viral arteritis(EVA).

TaqMan real-time fluorescent quantitative RT-PCR in detection of macrophage inflammatory protein-2γ mRNA in myocarditis murine

Objective: To study the role of macrophage inflammatory protein (MIP)-2γ in myocarditis pathogenesis in BALB/c mice. Methods: The relationship between the progression of Coxsarckie virus B3(CVB3) viral myocarditis and experimental autoimmune myocarditis and MIP-2γ mRNA expression in mouse was studied by TaqMan real-time fluorescent quantitative RT-PCR. Results: MIP-2γ mRNA expression rose on 3 to 5 d after CVB3 infection, reached peak on 7 d, and returned to normal level until 14 d, which corresponded well with the disease course. The MIP-2γ mRNA expression level rose significantly on the day 18 d after immunization with porcine cardiac myosin, which was consistent with pathological examination. Conclusion: MIP-2γ may be involved in the pathogenesis of myocarditis.

Detection of Survivin mRNA in nasopharyngeal carcinoma by real-time fluorescence quantitative RT-PCR

Objective： To establish the method of real time fluorescence quantitative RT-PCR for detecting the expression of Survivin mRNA in nasopharyngeat carcinoma （NPC） tissues. Methods： The total RNA was extracted from NPC cell line CNE-2 and tissues with Trizol and then been transcribed reversely to cDNA, a method of real time fluorescence quantitative RT-PCR for detecting the expression of Survivin mRNA in NPC tissues had been established, in which chronic nasopharyn-gitis patients＇ nasopharynx tissues treated as control group. Results： The expression of Survivin mRNA all could be detected either in CNE-2 cells, NPC tissues or in chronic nasopharyngitis patients＇ nasopharynx tissues, and there was higher the expression level of Survivin mRNA in NPC tissues than which in chronic nasopharyngitis patients＇ nasopharynx tissues, the difference was significant （P 〈 0.01）. The expression of Survivin mRNA could be detected both in stage Ⅰ ＋ Ⅱ and stage Ⅲ ＋ Ⅳ NPC, and there was no significant difference in relative quantifications of gene expression between these two groups （P 〉 0.05）. There was no relationship between Survivin mRNA expression and age and sex of NPC patients （P 〉 0.05）. Conclusion： Real time fluorescence quantitative RT-PCR is a rapid, effective and high sensitive method for detecting the expression of Survivin mRNA in NPC tissues. The overexpression of Survivin mRNA may play some roles in pathogenesis of NPC.

Detection and clinical significance of multidrug resistance-1 mRNA in bone marrow cells in children with acute lymphoblastic leukemia by real-time fluorescence quantitative RT-PCR

Objective： Multidrug resistance（MDR） is one of the most important reasons for treatment failure and recurrence of acute leukemia. Its manifestations are different in children with acute lymphoblastic leukemia（ALL） which may be due to different detection methods. This study was to detect the expression of MDR1 mRNA in bone marrow cells of children with ALL by real-time fluorescence- quantitative reverse transcription polymerase-chain reaction（FQ-RT-PCR）, and combine minimal residual desease（MRD） detection by flow cytometry（FCM） and to study their relationship with treatment response and prognosis of ALL. Methods：The MDR1 mRNA levels in bone marrow cells from 67 children with ALL[28 had newly diagnosed disease, 27 had achieved complete remission（CR）, 12 recurrent] and 22 children without leukemia were detected by FQ-RT-PCR. MRD was detected by FCM. The patients were observed for 9-101 months, with a median of 64 months. Results：Standard curves of human MDR1 and GAPDH genes were constructed successfully. MDR1 mRNA was detected in all children with a positive rate of 100%. The mRNA level of MDR1 was similar among the newly diagnosed ALL group, CR group, and control group（P 〉 0.05）, but significantly higher in the recurrence group than that in newly diagnosed disease group and control group（0.50 ± 0.55 vs. 0.09 ± 0.26 and 0.12 ± 0.23, P〈 0.05）. 54 ALL patients were followed up, and it was found that MDR1 mRNA level was significantly higher in ALL patients within 3 years duration than that of ALL patients with 3-6 years and over 6 years duration（0.63 ± 0.56 vs. 0.11 ± 0.12 and 0.04 ± 0.06, P〈 0.01）. For the 28 children with newly diagnosed disease, the MDR1 mRNA level was similar between WBC 〉 50 ~ 109 group and WBC〈50 × 10^9 group（P〉 0.05）. In the 33 CR patients, the MDR1 mRNA level was significantly higher in MRD〉10a group than that in MRD〈10a group（0.39 ± 0.47 vs. 0.03 ± 0.03, P 〈 0.05）. Conclusion：The sensitivity and specificity of FQ-RT-PCR in detecting MDR1 mRNA in bone marrowy cells of children with ALL patients are high. MDR1 mRNA is expressed in children with and without leukemia. MDR1 mRNA is highly expressed in the CR ALL patients with high MRD, recurrence and short duration（within 3 years）. Monitoring MRD and the MDR1 mRNA level might be helpful for individual treatment.

Synchronous Detection of DNA/RNA of Four Shrimp Viruses by Real-time Fluorescence Quantitative RT-PCR

[ Objective] This study aimed to establish a simultaneous detection method of shrimp viruses by real-time fluorescence quantitative RT-PCR, to improve the efficiency of inspection and quarantine. [ Method] A novel real-time fluorescence quantitative RT-PCR assay was established and optimized for simultaneously detecting DNA/RNA of four shrimp viruses （WSSV, IHHNV, TSV and YHV ）. [ Result] The optimized real-time fluorescence quantitative RT-PCR system gener- ated typical amplification curves with high amplification efficiencies （E = 1.06, 1.07, 0.92 and 0.92, respectively）, good hnear relationship （ r = 1 ）, uniform repeatability （ standard deviation = 0.05 - 0.46 ; variation coefficient = 0.26% - 1.62% ） and high sensitivity, exhibiting no significant differences compared with re- al-time fluorescence quantitative PCR （average error of Ct value = 0.04 -0.40; T = 0.53 -2.50; P 〉 0.05 ）. The total detection time was about 1 h. [ Conclusion] The optimized real-time fluorescence quantitative RT-PCR system can be used for rapid detection of WSSV, IHHNV, TSV and YHV.

Establishment of a Real-time Fluorescent Quantitative RTPCR Method for Detecting NP Gene of Class Ⅰ Newcastle Disease Virus(NDV)

Newcastle disease( ND) is one of the most serious infectious diseases that infect the poultry industry.There is only one serotype of Newcastle disease virus( NDV),but NDVs can be divided into two distinct classes( class Ⅰ,and class Ⅱ) according to their genetic relationship.To develop a method for rapid quantitative detection of class Ⅰ NDV,a pair of primers and a TaqM an probe were designed and synthesized according to the conservative sequence of NP gene of class Ⅰ NDV.The positive recombinant plasmid harboring NP gene of JS-18-05 isolate was used as a positive template to establish the standard curve.A real-time fluorescent quantitative RT-PCR method was established for rapid detection of class Ⅰ NDV with strong specificity,high sensitivity and good repeatability.The established method exhibited a good linear relationship within the concentration of 102 to 108 copies of NDV,by which 1 μl of 10 copy of NDV nucleic acid could be detected in the initial template.Compared with conventional virus isolation methods,the established method had similar sensitivity and led to the same results in detecting33 class Ⅰ,class Ⅱ NDV isolates.The study provided the basis for rapid quantitative detection of class Ⅰ NDVs and further clarification of their pathogenicity and pathogenic mechanism in poultry.

基于DPO引物检测猪流行性腹泻病毒荧光定量RT-PCR方法的建立及初步应用

为建立快速、准确检测猪流行性腹泻病毒(PEDV)的方法,本研究以PEDV的N基因为靶基因,基于双启动寡核苷酸引物(DPO),经过条件优化,建立了检测PEDV的荧光定量RT-PCR方法。结果显示,DPO引物的有效退火温度范围较宽(45℃~65℃);在测试的10种病毒中仅PEDV为阳性扩增结果,其余病毒为阴性结果,特异性较强;对PEDV质粒标准品的检测限可达1.64×10^1拷贝/μL,敏感性较高;组内、组间重复性结果的变异系数均小于1%,重复性较好。利用该方法对采集的272份临床仔猪腹泻样品(粪便、小肠组织)进行检测,结果显示,共检出PEDV阳性样品39份,阳性率为14.34%,与常规RT-PCR方法检测结果的阳性符合率为92.31%;本研究建立方法检测的阳性样品经PEDV N基因测序鉴定,确实均为PEDV阳性样品。本研究建立的基于DPO引物检测PEDV的荧光定量RT-PCR方法为PEDV的准确检测和流行病学调查提供技术支持。

The application of sequence specific primer and RT-PCR to LRRK2 gene polymorphism typing

Objective:To establish a new detecting method for disease susceptibility loci R1628P and G2385R of Parkinson’s disease(PD)related gene LRRK2.Methods:Sequence specific primers were designed to make a genotyping of DNA markers with known genotypes by use of quantitative fluorescence real-time PCR(RT-PCR).100 cases of PD samples with unknown genotypes were tested,and verified by use of polymerase chain reaction linked restriction fragment length polymorphism(PCR-RLFP).Results:The genotyping results of DNA markers proved to be correct,and 100 cases of samples to be tested had a completely consistent genotyping result with PCR-RLFP genotyping result.Conclusions:Sequence specific primer and quantitative fluorescence RT-PCR can successfully make a genotyping for disease susceptibility loci R1628P and G2385R of LRRK2.

Cloning of Rabbit Bone Morphogenetic Protein 15 and Its Expression During in vitro Maturation of Rabbit Oocytes

Partial cDNA sequence of rabbit BMP15 was cloned by RT-PCR from rabbit ovaries, showing a similarity of 83%-90% with the BMP15 nucleotide sequences in humans, mice, ovine, sheep, cows and pigs. The expression of BMP15 in rabbit cumulus-oocyte complexs during oocytes in vitro maturation （IVM） was measured by fluorescent quantitative RT-PCR method. BMP 15 was expressed at low levels in immature oocytes and increased to the highest level at 16h of IVM, which coincides with the time of cumulus cell expansion, then declined slowly under IVM cultivation. The expression pattern of BMP 15 suggested that it might be important in cumulus expansion in rabbits.

6319例高危型人乳头瘤病毒核糖核酸定量检测的结果分析

目的探讨女性高危型人乳头瘤病毒(HPV)感染亚型分布情况及年龄特点。方法采用双通道实时荧光定量PCR检测方法,对6319例女性高危型HPV-DNA 16型、HPV-DNA 18/45型、HPV-DNA 31型、HPV-DNA 33/52/58/67型进行定量分析,比较不同年龄组HPV-DNA阳性率及不同型别HPV-DNA的分布。结果 6319例女性中检出HPV-DNA阳性患者794例,总阳性率为12.6%。51～60岁组与≥61岁组的阳性率均为15.8%,且高于其他年龄组差异有统计学意义(P<0.05),其次为21～30岁组阳性率为13.8%。不同类型HPV-DNA阳性率从高到低依次为HPV-DNA 33/52/58/67型(69.3%)、HPV-DNA 16型(21.5%)、HPV-DNA 18/45型(12.1%)、HPV-DNA 31型(6.9%)。结论高危型人乳头瘤病毒核糖核酸定量检测可用初筛女性宫颈癌的人群,更应作为年龄在38～58岁的女性健康体检时的必选项目,且对宫颈癌的诊断和药物治疗具有重要意义。

双重荧光实时定量PCR法检测TNF-α mRNA表达水平

目的:建立单管检测肿瘤坏死因子-α(TNF-α)和内参GAPDH mRNA表达水平的双重荧光实时定量PCR方法。方法:脂多糖刺激小鼠巨噬细胞Ana-1后提取细胞RNA,经反转录合成c DNA,应用自行设计的不同荧光标记的TNF-α和GAPDH引物探针,经PCR扩增后,在FAM通道和CY5通道分别读取Ct值,同时应用基因测序技术对结果进行验证,并构建质粒标准品分析该方法的灵敏度和重复性。结果:双重荧光实时定量PCR法检测TNF-α的灵敏度达4×101拷贝/μL,检测线性范围可达6个数量级,批内和批间重复性好。结论:新方法消除了目的基因与内参的加样误差,节约成本,快速准确,适用于TNF-αmRNA的定量检测。

双重TaqMan荧光定量PCR在β-地中海贫血产前诊断中的应用

目的建立基因点突变双重TaqMan荧光定量PCR方法,实现β-地中海贫血(β-地贫)高风险胎儿产前基因诊断快速、准确。方法以每反应管检测一个位点的突变和野生型基因序列,建立β-地贫基因点突变双重TaqMan荧光定量PCR体系,检测β-地贫高风险胎儿绒毛标本6例、羊水标本32例,根据荧光PCR阳性扩增结果结合两荧光通道的Ct值差异分析受检标本的基因型,同时以常规RDB检测为对照,分析与评价检测结果。结果 6例胎儿绒毛标本中,RDB检测无法判断结果 1例,经该方法检测为野合纯合子;RDB检测误诊为CD41-42合并CD26双重杂合子1例,经该方法检测为CD41-42杂合子。32例胎儿羊水标本中,RDB检测无法判断的标本1例,经该方法检测为CD41-42杂合子。该3例标本经重新采集胎儿羊水标本复查,验证了定量检测结果的准确性。结论β基因点突变双重TaqMan荧光PCR定量检测方法,可实现β-地贫高风险胎儿的快速准确产前基因诊断,操作简单快速,结果准确可靠,是较为理想的β-地贫产前诊断方法。

利用双萤光素酶报告基因系统筛选有效的siRNA

目的建立一种利用双萤光素酶报告基因系统筛选能有效抑制目的基因表达的小干扰RNA(siRNA)的方法。方法以绿色荧光蛋白(GFP)基因为研究对象,构建3个候选的靶向GFP的siRNA表达质粒pSi-GFPsiRNA1、pSi-GFPsiRNA2、pSi-GFPsiRNA3和阴性对照pSi-Negative。构建拥有同一Kozak共有翻译启始序列、翻译启始密码子ATG的GFP与萤光素酶基因(LUC)的融合表达载体pGL3-GFPf。将包含3个GFPsiRNA靶序列的GFP片段插入到改建过的pGL3-promoter载体上LUC的3'非翻译区(UTR),构建pGL3-GFPp。将GFPsiRNA表达质粒联同内参照质粒pRL-TK分别与pGL3-GFPf、pGL3-GFPp共转化HEK293细胞。利用双萤光素酶检测试剂盒测定各组细胞中萤光素酶的活力水平,用荧光定量PCR检测各组细胞中GFPmRNA的表达水平。结果同对照组相比,与pGL3-GFPf共转化GFPsiRNA表达质粒的各组细胞中萤火虫萤光素酶/海肾萤光素酶比值明显降低,其中GFPsiRNA1表达组中降低最显著(P<0.01);定量PCR检测也显示,GFPsiRNA1表达组中GFPmRNA的表达水平降低最明显(P<0.01)。双萤光素酶活性检测和定量PCR结果还显示,与pGL3-GFPp共转化GFPsiRNA表达质粒的各组细胞中,GFPsiRNA1抑制GFP的表达最显著(P<0.01)。结论本文建立了通过双萤光素酶活性检测来筛选有效的siRNA的方法,并为进行多个基因的有效siRNA的筛选提供解决方案。

双色荧光定量检测大米中的汞

利用两条部分互补的富含胸腺嘧啶(T碱基)的单链核酸,结合氧化石墨烯及核酸染料SYBR GreenⅠ,采用同步荧光分析法,建立一种高灵敏度、高选择性的汞离子(Hg2+)双色荧光定量检测方法。在优化条件下,Hg2+浓度在5×10-10~500×10-10 mol/L之间时,SYBR GreenⅠ及Carboxy-X-rhodamine(ROX)总的荧光强度(△IT)与Hg2+浓度(C)之间具有良好的线性关系,其拟合的回归方程为△IT=2.121 3C+10.536 0,方法检出限(3σ)为2×10-10 mol/L。该方法操作简单、检测速度快、选择性好、灵敏度高、重复性好、检出限低。将该方法应用于大米中汞的检测,获得了满意的结果。

染色体R显带分析、双色荧光原位杂交及实时荧光定量PCR对于急性早幼粒细胞性白血病诊断价值的评价

目的:评价染色体R显带技术(RT)、双色荧光原位杂交(D-FISH)和荧光定量PCR(RT-PCR)对急性早幼粒细胞白血病(APL)的诊断价值。方法:采用三种方法分析340例疑诊为APL患者的细胞遗传学特征或PML/RARa融合基因,以MICM综合诊断作为APL的诊断"标准",并与三者联合检测比较,评价RT、D-FISH和RT-PCR三者的诊断价值。结果:对于APL的诊断,RT、D-FISH以及RT-PCR三者的敏感度分别为81.3%(78/96),95.0%(91/96)和96.9%(93/96),RT漏检18例,D-FISH的检测结果判断5例假阳性,2例假阴性,RT-PCR的检测结果存在4例假阳性,3例假阴性。三者联合检测的敏感度为99.97%,特异度为100%。结论:三种检测方法单独应用于APL的诊断均存在一定的弊端,三者联合运用有利于提高临床诊断率,同时减少误诊率和漏诊率。

双重实时荧光定量PCR检测人维生素D受体的方法学构建

目的 建立单管检测人维生素D受体（VDR）及甘油醛-3-磷酸脱氢酶（GAPDH）基因的双重实时荧光定量聚合酶链反应（dual real-time PCR）的方法。方法 以GAPDH基因为内参,采用Primer Premier 5.0软件设计特异性引物及Taq Man探针,进行PCR扩增检测VDR基因。将VDR及GAPDH扩增产物片段纯化后克隆构建成重组质粒,作为定量检测基因表达的标准品,并用于分析该方法的灵敏度和重复性。结果 PCR扩增产物经测序分析证实为VDR及GAPDH特异性片段;该方法检测VDR与GAPDH灵敏度达40拷贝/μL;线性范围为4.00×10~1~4.00×10~5拷贝/μL;决定系数R2分别为0.998、0.999;扩增效率E分别为96.10%、85.15%;批内变异系数（CV）分别为0.09%~1.21%、0.35%~0.88%;批间CV分别为0.17%~0.51%、0.51%~2.46%。结论 成功建立了单管检测人VDR及GAPDH的双重实时荧光定量PCR方法,且该方法特异性好、灵敏度高、可快速高通量检测VDR的相对表达量,有效缩短时间,减小实验误差。

Relationship Between Heart Damages and HSPs mRNA in Persistent Heat Stressed Broilers

The relationship between myocardial cell damages and HSPs mRNA transcription in heat stressed broilers was studied using a spectrophotometer, the histopathological technique, and fluorescence quantitative reverse transcription PCR （FQ RT-PCR）. The results showed that the activities of creatine kinase （CK） and glutamic-pyruvic transaminase （GPT） were induction during the persistent heat stress. The major lesions of the myocardial fibers were granular degeneration and necrosis. The transcription of constitutive or cognate heat shock protein 70 （HSC70） mRNA was changeable. The transcription of heat shock protein 70 （HSPT0） mRNA was increased obviously in the course of persistent heat stress. The results showed that the change of HSC70 mRNA transcription was contrary to the activity of CK, and the level of HSC70 mRNA transcription must be used as a symbol of the myocardial cell damages in the course of persistent heat stress.

猪瘟病毒与非洲猪瘟病毒双重荧光定量PCR方法的建立与应用

为了建立能够猪瘟病毒(Classical swine fever virus,CSFV)和非洲猪瘟病毒(African swine fe⁃ver virus,ASFV)双重荧光定量PCR方法,试验比对了CSFV与ASFV的基因组序列,针对CSFV 5′-UTR和ASFV B646L保守靶序列,分别设计2条特异性引物及1条TaqMan探针,通过优化扩增体系和程序,建立可同时检测CSFV和ASFV的双重荧光定量PCR方法,并建立该方法的标准曲线,同时用敏感性试验、特异性试验和重复性试验对该方法进行评价,最后检验该方法的应用效果。结果表明:CSFV和ASFV标准曲线的相关系数(R2)分别为0.999和1,线性关系良好;CSFV与ASFV的最低检测浓度分别为1.3×100 copies/μL和2.4×100 copies/μL;与其他常见猪只病原检测无交叉反应;批间与批内变异系数均小于2%,稳定性良好。试验建立的方法对44份临床样本的检测结果与《猪瘟病毒实时荧光RT-PCR检测方法》(GB/T 27540—2011)和《非洲猪瘟诊断技术》(GB/T 18648—2020)检测结果一致。说明试验建立的双重荧光定量PCR方法敏感、特异、稳定,可用于CSFV和ASFV的快速检测和鉴别诊断。

基于双重猝灭分子信标及核酸染料Hoechst 33258对单链核酸的双色定量检测

利用鸟嘌呤(G)碱基和有机猝灭基团Black Hole Quencher1(BHQ-1)对荧光基团6-羧基荧光素(6-Carboxyfluorescein group,FAM)的双重猝灭作用构建了一种结构简单的双重猝灭分子信标,结合核酸染料Hoechst 33258,以艾滋病毒RNA片段的反转录序列(33个碱基)为目标DNA,建立了一种高灵敏单链核酸(ssDNA)的双色荧光定量检测方法。此分子信标中,荧光基团及有机猝灭基团分别设计为FAM和BHQ-1,分子信标的茎的碱基全部设计为C-G碱基对,环的碱基序列设计为目标DNA的互补序列,与BHQ-1相连接的为3个带有G碱基的核苷酸。没有目标DNA时,分子信标呈茎-环结构,荧光基团FAM与有机猝灭基团BHQ-1及G碱基距离很近,在BHQ-1及G碱基的双重猝灭下,FAM的荧光很弱;另外,分子信标的茎的碱基全部是C-G碱基对,不能与核酸染料Hoechst 33258相结合,因此Hoechst 33258的荧光也很弱。当有目标DNA存在时,分子信标的环与目标DNA杂交形成双链,茎-环结构被破坏,FAM远离猝灭基团BHQ-1及G碱基,其荧光得到恢复;同时,核酸染料Hoechst 33258与双链DNA中的A-T碱基对相结合,其荧光显著增强。根据荧光基团FAM及核酸染料Hoechst 33258荧光增强的程度可实现对ssDNA的定量检测。在优化的条件下,目标DNA的浓度在0.05~8.0nmol/L范围内时,FAM和Hoechst 33258的总荧光强度(ΔIT)与目标DNA的浓度(C)具有良好的线性关系,回归方程为ΔIT=192.2C+115.08(R^2=0.9938),检出限为20pmol/L(3σ,n=9)。此方法操作简单、灵敏度高、选择性好、检出限低。

双重实时荧光定量PCR技术检测中药制剂中沙门氏菌和大肠埃希菌

目的:建立双重实时荧光定量PCR(multiplex quantitative real-time PCR,multiplex qPCR)快速检测中药制剂中沙门氏菌和大肠埃希菌2种常见控制菌的方法。方法:筛选两种目标菌株的特异性引物与探针,扩增沙门氏菌的invA基因和大肠埃希菌的uidA基因,优化反应体系,建立双重荧光定量PCR方法。结果:两对引物探针对沙门氏菌和大肠埃希菌均有较好地扩增效率,人工污染中药制剂中沙门氏菌的检出限为101 CFU·mL^(-1),大肠埃希菌的检出限为101 CFU·mL^(-1)。结论:本研究建立的双重实时荧光定量PCR方法具有特异性强、重复性好,灵敏度高等特点、适用于中药制剂中沙门氏菌和大肠埃希菌的快速检测。