Rapid Detection of Rifampin-resistant Clinical Isolates of Mycobacterium tuberculosis by Reverse Dot Blot Hybridization

Objective A PCR-reverse dot blot hybridization （RDBH） assay was developed for rapid detection of rpoB gene mutations in ＇hot mutation region＇ of Mycobacterium tuberculosis （M. tuberculosis）. Methods 12 oligonucleotide probes based on the wild-type and mutant genotype rpoB sequences of M. tuberculosis were designed to screen the most frequent wild-type and mutant genotypes for diagnosing RIF resistance. 300 M. tuberculosis clinical isolates were detected by RDBH, conventional drug-susceptibility testing （DST） and DNA sequencing to evaluate the RDBH assay. Results The sensitivity and specificity of the RDBH assay were 91.2% （165/181） and 98.3% （117/119）, respectively, as compared to DST. When compared with DNA sequencing, the accuracy, positive predictive value （PPV） and negative predictive value （NPV） of the RDBH assay were 97.7% （293/300）, 98.2% （164/167）, and 97.0% （129/133）, respectively. Furthermore, the results indicated that the most common mutations were in codons 531 （48.6%）, 526 （25.4%）, 516 （8.8%）, and 511 （6.6%）, and the combinative mutation rate was 15 （8.3%）. One and two strains of insertion and deletion were found among all strains, respectively. Conclusion Our findings demonstrate that the RDBH assay is a rapid, simple and sensitive method for diagnosing RIF-resistant tuberculosis.

Detection of mutation in embB gene of Mycobacterium tuberculosis from clinical isolates of tuberculous patients in China by means of reverse-dot blot hybridization

The relationship between embB mutation of Mycobacterium tuberculosis and ethambutol (EMB) resistance of the clinical isolates of tuberculous patients in China was investigated by reverse dot blot hybridization (RDBH) in addition to evaluating the clinical value with application of PCR-RDBH technique to detect EMB resistance. In the present study, the genotypes of the 258 bp fragments of embB genes from 196 clinical isolates of M. tuberculosis were analysed with RDBH and DNA sequencing. It was demonstrated that 60 out of 91 phenotypically EMB-resistant isolates (65.9%) showed 5 types of missense mutations at codon 306 of embB gene, resulting in the replacement of the Met residue of the wild type strain with Val, Ile or Leu residues. In these mutations, the GTP mutation (38/91, 41.8%) and the ATA mutation (16/91, 17.6%) were the most encountered genotypes. The embB mutation at codon 306 could also be found in 69 isolates of phenotypically EMB-sensitive but resistant to other anti-tuberculous drugs, but no such gene mutation could be found in 36 strains of drug-sensitive isolates. Meanwhile, the concordance with the results of DNA sequencing for one wide-type probe and 5 probes for specific mutations was 100% . It was concluded that the EMB-resistance occurring in most M. tuberculosis is due to appearance of embB mutation at codon 306, and the PCR-RDBH assay was proved to be a rapid, simple and reliable method for the detection of gene mutations, which might be a good alternative for the drug-resistance screening.

Comparison of the Tellgenplex HPV DNA test with the PCR-reverse dot blot assay for human papillomavirus genotyping

Objective: To access the performance of the Tellgenplex human papillomavirus(HPV) DNA test compared to the polymerase chain reaction-reverse dot blot(PCR-RDB) assay for the HPV genotyping.Methods: Sixty cervical swab samples were genotyped by the Tellgenplex HPV DNA test and the PCR-RDB assay.The Tellgenplex HPV DNA test and the PCR-RDB assay can detect 26 and 23 HPV genotypes, respectively.Each sample showed discrepancy was genotyped using sequencing.Results: The percent agreement between the two tests ranged from 83.3% to 100.0% according to different genotype.This showed perfect agreement(>0.81) for high-risk HPV genotypes(35, 39, 45, 53, 56, 59, 66, 68, and 82), substantial agreement(>0.65) for high-risk HPV genotypes(16, 18, 33, 52, and 58) and low-risk HPV genotype 43 between the two assays by the kappa analysis.The positive rates of the two assays for frequent HPV genotypes(16, 35, 39, 45, 52, 53, 58, 59, 66, and 82) were not statistically different, but the PCR-RDB assay showed higher positive rates than the Tellgenplex HPV DNA test for HPV genotypes 81(P<0.05).As for more than 10 positive results by the Tellgenplex HPV DNA test and/or the PCR-RDB assay, the PCR-RDB assay showed higher relative sensitivity and specificity than the Tellgenplex HPV DNA test for the three HPV genotypes(16, 52, and 81).All HPV genotypes that can be detected by only the Tellgenplex HPV DNA test(HPV genotypes 44 and 55) were confirmed by sequencing.Conclusions: In conclusion, our results demonstrated that the PCR-RDB assay which can detect more multiple HPV genotypes in each specimen shows higher relative sensitivity and specificity than the Tellgenplex HPV DNA test, which makes it a better option for routine clinical use.

A rapid reverse dot blot assay for all 18 β-thalassemia mutations in Chinese population

A set of allele-specific oligonucleotide (ASO) probes used for detecting all 18 β-tha-lassemia mutations found in Chinese was immobilized on two strips of Biodyne C membrane;one containing 7 pairs of oligonucleotide probes specific for the most commonly found mutant al-leles,and the other containing the remaining 11 pairs of ASO_s specific for the less commonlyfound.The membranes were hybridized with β-globin sequences amplified by polymerase chainreaction (PCR) with biotinylated primers,and then treated with Streptavidin-POD conjugateand substrates for color development.The method has been applied successfully to the detectionof all 18 Chinese β-thalassemia mutations and prenatal diagnosis of two high-risk pregnancies ofβ-thalassemia.Patients with homozygous,heterozygous and compound heterozygous alleles ofthese mutations and normal individuals could be easily distinguished by the present method.Us-ing the immobilized-probe format (reverse dot blot),it was able to screen simultaneously multi-ple β-thalassemia mutations of a DNA sample by performing hybridization only once.This assayis simple,rapid and independent of radio-isotopes and can be appplied for all 18 β-thalassemiamutations so far found in Chinese population.It is considered that this method may be usefulfor gene frequency investigation of large numbers of β-thalassemia DNA samples and used as aroutine method in the clinic laboratory.

实时PCR和PCR-RDB法检测人乳头瘤病毒的比对研究

目的：比较实时 PCR 法和 PCR-反向点杂交法（PCR-RDB）检测 HPV 的一致性。方法收集109份女性生殖道样本，利用实时 PCR 法和 PCR-RDB 法分别检测 HPV 感染和基因型分布情况，不一致样本采用 PCR-悬浮芯片杂交法复检。结果83.5％（91／109）的样本两种方法结果一致（kappa＝0.671），18例不一致样本 PCR-悬浮芯片杂交法复检显示7例与实时 PCR相符，11例与 PCR-RDB 相符；高、低病毒载量组间 PCR-RDB 法的检测结果差异无统计学意义（χ2＝1.476，P ＝0.224）。结论实时 PCR 和 PCR-RDB 两法用于 HPV 检测一致性一般；HPV 病毒载量在103～108范围内时 PCR-RDB 法的阳性率较稳定。

人乳头状瘤病毒亚型PCR/RDB基因分析方法的建立及初步评价

目的建立一种基于PCR和RDB技术的临床实用、价格低廉、能对目前已知的绝大多数高危型及常见的低危型人乳头状瘤病毒(HPV)进行基因分型的检测方法(PCR/RDB法),并对该方法用于HPV分型检测做出方法学评价。方法根据HPV基因序列设计可扩增包含目前常见的HPV型别的通用引物,并根据14种HPV高危亚型(16、18、31、33、35、39、45、51、52、56、58、59、66、68)和7种低危亚型(6、11、42、43、44、53、CP8304)的序列特点设计针对这21种HPV型别的型特异性探针。21种HPV亚型标准毒株PCR产物与HPV型特异性探针进行杂交,建立一次性对21种HPV亚型进行分型的PCR/RDB检测方法。将PCR/RDB法用于213例经杂交捕获法(hybird capture,HCⅡ)检测为高危型HPV阳性样本的HPV型别诊断。结果建立的PCR/RDB法均能鉴定出21种HPV亚型,无假阳性和假阴性结果,未出现交叉反应;含有相当于10个以上HPV分子的质粒标准品均能成功获得PCR产物检测的阳性结果;盲法分析结果显示,195例经HCⅡ法检测为高危型HPV阳性的样品被PCR/RDB检测出具体的HPV型别,共检测出13种高危型HPV亚型,检出率分别是32.31%(16型)、23.08%(52型)、17.95%(58型)、11.79%(31型)、10.26%(68型)、9.74%(33型)、8.21%(18型)、6.15%(66型)、3.08%(59型)、2.05%(45型)、2.05%(39型)、1.54%(56型)、1.03%(51型)。单一HPV亚型感染及2种、3种和4种HPV亚型混合感染构成比分别为59.46%、30.81%、8.65%和1.08%。18例未能检测出HPV的具体型别,PCR/RDB法与HCⅡ法的高危型HPV检测结果的符合率为91.5%(195/213)。结论PCR/RDB法与HCⅡ法高危型HPV检测阳性符合率高,并可一次性分析出21种HPV型别,是一种准确、高效、经济的HPV型别检测方法,可用于HPV的常规基因型分型诊断及人群筛查。

Accuracy of a reverse dot blot hybridization assay for simultaneous detection of the resistance of four anti-tuberculosis drugs in Mycobacterium tuberculosis isolated from China

Background:Drug resistant tuberculosis poses a great challenge for tuberculosis control worldwide.Timely determination of drug resistance and effective individual treatment are essential for blocking the transmission of drug resistant Mycobacterium tuberculosis.We aimed to establish and evaluate the accuracy of a reverse dot blot hybridization(RDBH)assay to simultaneously detect the resistance of four anti-tuberculosis drugs in M tuberculosis isolated in China.Methods:In this study,we applied a RDBH assay to simultaneously detect the resistance of rifampicin(RIF),isoniazid(INH),streptomycin(SM)and ethambutol(EMB)in 320 clinical M.tuberculosis isolates and compared the results to that from phenotypic drug susceptibility testing(DST) and sequencing.The RDBH assay was designed to test up to 42 samples at a time.Pearson's chi-square test was used to compute the statistical measures of the RDBH assay using the phenotypic DST or sequencing as the gold standard method,and Kappa identity test was used to determine the consistency between the RDBH assay and the phenotypic DST or sequencing.Results:The results showed that the concordances between phenotypic DST and RDBH assay were 95%for RIF,92.8%for INH,84.7%for SM,77.2%for EMB and the concordances between sequencing and RDBH assay were 97.8%for RIF,98.8%for INH,99.1%for SM,93.4%for EMB.Compared to the phenotypic DST results,the sensitivity and specificity of the RDBH assay for resistance detection were 92.4 and 98.5%for RIF,90.3 and 97.3%for INH,77.4 and 91.5%for SM,61.4 and 85.7%for EMB,respeaively;compared to sequencing,the sensitivity and specificity of the RDBH assay were 97.7 and 97.9%for RIF,97.9 and 100.0% for INH,97.8 and 1OO.O% for SM,82.6 and 99.1%for EMB,respectively.The turnaround time of the RDBH assay was 7 h for testing 42 samples.Conclusions:Our data suggested that the RDBH assay could serve as a rapid and efficient method for testing the resistance of M. tuberculosis against RIF,INH,SM and EMB,enabling early administration of appropriate treatment regimens to the affected drug resistant tuberculosis patients.

PCR—RDB判断HPV分型在宫颈癌的早期诊断价值

目的：通过对人乳头瘤病毒（HPV）分型采用PCR-反向点杂交法（PCR—RDB）进行检测，探析该法在宫颈癌（SCC）的早期诊断中的临床价值。方法：分析2013年6月至2015年6月在我院门诊部就诊的166例SCC患者的临床资料。根据检测方式的不同将入选者分成观察组（HPV分型联合TCT检测，166例）和对照组（TCT检测，166例）两组。比较不同检测方案的检测结果以及两组患者的检测结果。结果：HPV阳性检出率为33．1％（55／166）：TCT的阳性检出率为30．1％（50／166），116例TCT阴性患者中HPV阴性者97例，阳性者19例，HPV阳性率是16．4％；50例TCT阳性病例中HPV阴性者18例，阳性者36例，HPV阳性率是72．0％。病理检测的阳性率为21．7％（36／166），其中HPV阳性患者31例，阴性患者5例，即HPV阳性率是86．1％。观察组的特异度为97．0％（128／132），灵敏度为88．6％（31／35），Youden指数是0．856；对照组特异度92．2％（107／116），灵敏度为49．0％（25／51）。Youden指数是0．412。观察组的真阴性和真阳性结果均比对照组优秀，差异显著（P〈0．05）。结论：HPV分型采用PCR-反向点杂交法检测可以使TCT检测的特异度和灵敏度显著提升，对早期诊断SCC有重要意义。

Reverse Dot Blot Analysis: A Rapid Prenatal Diagnostic Approach for β-thalassemia Mutations in Chinese

The recently developed method of in vitro DNA amplification by PCR coupled with radioactive or nonradioactive ASO probe detection provides a simple approach to the prenatal diagnosis of β-thalassemia. However, the DNA diagnosis of β-thalassemia has remained a complicated problem,because β-thalassemia

基因芯片对人乳头瘤病毒的快速检测和分型

目的 针对HPV DNA亚型的异质性,建立HPV DNA亚型的基因芯片快速检测方法,为HPV感染病例提供诊断依据。方法 18 种HPV DNA亚型(HPV6、16、18、31、33、35、39、11、45、51、52、53、56、58、42、59、66、68)特异性探针,固定于硝酸纤维素膜制备成基因芯片,生物素标记引物经通用引物介导PCR(GD PCR)扩增HPV DNA, PCR产物与基因芯片经反向点杂交检测HPV亚型;同时采用荧光定量PCR检测HPV6、11、16 和18亚型。结果 31 例标本中,基因芯片的阳性检出率为74.2%,其中HPV6/18、HPV11/16、HPV33/58 和HPV6/11/33多重感染各1 例(3.2%);荧光定量PCR 阳性检出率为67.7%,与前种方法相比较,漏诊率为6.5%。结论 HPV分型基因芯片可1次检测HPV多种亚型,灵敏度高和特异性强,有利于对HPV多重感染的诊断。

少数民族β-地中海贫血基因突变型分布特点

目的 了解 β-地中海贫血在贵州省苗族、水族、瑶族中的基因突变型特点、基因型频率及分布规律。 方法 采用“红细胞休克 -管定量法”测定红细胞脆性 ,HbF和HbA2定量等方法对人群进行 β -地中海贫血初筛 ,用常规酚 -氯仿抽提法提取 β地中海贫血携带者DNA ,经PCR -反向点杂交法对β株蛋白进行突变基因分析。 结果 受检 2 5 6 6人中 ,共检出 134例 β -地中海贫血携带者 ,总检出率为 5 2 2 % ,其中苗族、水族、瑶族检出率分别为 4 72 % ,6 0 6 % ,4 4 5 %。经β珠蛋白突变基因分析 ,在这 3个民族中仅检出两种中国人常见突变型CD41-42 和CD17,检出率分别为 88 1% ,6 0 0 % ,2 3%。结论 在贵州省少数民族中 β -地中海贫血有很高的发病率 ,基因突变类型具有显著的民族特征 。

贵州西江苗族β地中海贫血筛查及基因分析

目的 对贵州省西江苗族进行了一次大样本的 β地中海贫血筛查及基因分析。方法 采用 Hb F和Hb A2 定量测定对人群进行 β地中海贫血初筛 ,然后用常规酚—氯仿抽提法提取 β地中海贫血携带者 DNA,再经PCR—反向点杂交法对β珠蛋白进行突变基因分析。结果 在受检的 890人中 ,共检出β地中海贫血携带者 37例 ,发生率为 4.16 %。经基因分析该地人群的β地中海贫血基因突变类型主要为 CD41 - 4 2 (TCTT)移码突变(5 4.1% )和 CD1 7(A→ T)无义突变 (4 5 .9% )。结论 完成对贵州西江苗族进行的β地中海贫血调查 ,获取其流行病学资料及其基因类型特征 ,对该地人群进行婚姻指导、产前诊断。

贵州三都水族β-地中海贫血筛查及基因分析

目的 了解贵州省三都水族β-地中海贫血的发病率、基因突变类型及分布特点,进一步从分子水平揭示β-地中海贫血多态性。方法 采用"红细胞休克一管定量法"测定红细胞脆性,乙酸纤维素薄膜电泳分离测定HbA2,一分钟碱变性法测定HbF。对贵州省三都水族自治县1 090例当地水族居民,进行β-地中海贫血血液学筛查。用常规酚-氯仿抽提法提取β-地中海贫血携带者DNA,经PCR-反向点杂交法对β珠蛋白基因进行突变分析。结果 在受检的1 090人中,共检出β-地中海贫血携带者49例,检出率为4.50％,男性26例,女性23例,男女比值为1.1:1。经基因分析该地人群的β-地中海贫血基因突变类型主要为CD41-42(TCTT)移码突变(20例,40.82％)和CD17(A→T)无义突变(20例,40.82％),尚有9例(18.36％)不在中国人常见的16种β-地中海贫血突变范围内,待测序。结论 贵州省三都地区水族人群中β-地中海贫血有较高的发生率,且其基因突变类型有明显的地区差异和显著的民族特点,是我国一个较为特殊的β-地中海贫血分布区域。

应用膜反向斑点杂交技术快速检测结核分支杆菌耐乙胺丁醇基因型的研究

应用膜反向斑点杂交技术快速检测结核分支杆菌对乙胺丁醇 (EMB)耐药性。设计与合成用于检测结核分支杆菌耐EMB基因embB的寡核苷酸探针 ,点于硝酸纤维素膜上 ,与结核分支杆菌临床分离株生物素标记的聚合酶链反应 (PCR)产物进行反向斑点杂交 ,并与PCR 单链构象多态性 (PCR SSCP)和PCR 直接测序 (PCR DS)结果比较。对 81株结核分支杆菌临床分离株进行分析 ,31株EMB敏感株中 ,2 6株embB基因的SSCP图谱、膜反向斑点杂交结果与标准株 (H37Rv)完全相同 ;其余 5株SSCP图谱出现泳动变位 ,其中 3株E1b杂交阳性 ,PCR DS分析为embB基因 30 6位密码子ATG→GTG突变 ;2株E1d杂交阳性 ,PCR DS分析为embB基因 30 6位密码子ATG→ATA突变。 5 0株耐EMB菌株中 ,2 4株PCR SSCP图谱与标准菌株相同 ,E1杂交阳性 ;2 6株PCR SSCP图谱出现泳动变位 ,其中 18株E1b杂交阳性 ,2株E1c杂交阳性 ,5株E1d杂交阳性 ,1株E1e杂交阳性 ,未发现E1f杂交阳性 ,与PCR SSCP、PCR DS分析结果一致。突变检出率为 5 2 %。膜反向斑点杂交技术可能成为检测部分结核分支杆菌乙胺丁醇耐药基因型简便、快速的方法。

反向斑点杂交法快速检测甘薯羽状斑驳病毒和甘薯G病毒

【目的】以克隆得到的甘薯羽状斑驳病毒(Sweet potato feathery mottle virus,SPFMV)和甘薯G病毒(Sweet potato virus G,SPVG)基因片段为探针建立反向斑点杂交技术体系,应用于甘薯组培脱毒苗带毒情况检测,为生产优质甘薯组培脱毒苗提供保障。【方法】根据已公布的侵染甘薯的SPFMV和SPVG的核苷酸序列设计两对特异引物,以RT-PCR法从染病的甘薯叶片扩增SPFMV和SPVG的两个片段,并以克隆到的两个病毒片段及内参基因Actin片段为探针建立反向斑点杂交体系。【结果】分别克隆出长度约310和500 bp的片段,经BLAST比对,所获得的310 bp片段为SPFMV的外壳蛋白基因片段,同源性为97%,500 bp片段为SPVG的外壳蛋白基因片段,同源性为99%。分别用带有SPFMV和SPVG片段的重组质粒pUC-SPFMV和pUC-SPVG进行反向斑点杂交,发现不同病毒能获得单一信号,无交叉现象。以染病甘薯和脱毒甘薯苗为样品,用该种病毒的探针进行反向斑点杂交,染病植株样品中能获得单一信号,而脱毒苗甘薯样品未见任何信号,杂交结果与RT-PCR检测结果一致。【结论】用建立的反向斑点杂交技术体系能有效检测甘薯中的SPFMV和SPVG,无交叉信号,可用于甘薯组培脱毒苗的前期检测。

贵州从江侗族和江口土家族人群β-地中海贫血基因突变型的研究

目的了解β-地中海贫血在贵州从江县侗族、江口县土家族中的基因类型特点、基因型频率及分布规律。方法采用抗碱血红蛋白(HbF)和血红蛋白A2(HbA2)定量测定对人群进行β-地中海贫血初筛,同时应用全自动血细胞分析仪进行RBC、Hb、HCT、MCV、MCH、MCHC、RDW等7项血液学指标分析,用常规酚-氯仿抽提法提取筛查阳性受检者DNA,经PCR-反向点杂交法对β珠蛋白基因进行突变分析。结果受检982人中,共检出52例β-地中海贫血携带者,总检出率为5.27%,其中侗族、土家族检出率分别为7.85%、2.68%;经β珠蛋白突变基因分析,在这两个民族中检出中国人常见3种突变类型:CD17(A→T)无义突变(39例,75.00%),CD41-42(TCTT)移码突变(12例,23.07%)和βE(Codon26)(1例,1.92%)。结论在贵州省少数民族中β-地中海贫血有很高的发病率,基因突变类型具有显著的民族特征,β珠蛋白基因变异情况很独特,可能与族内婚配、家族发病聚集性和通婚地域半径狭小有关。

用抑制消减杂交法分离巴西橡胶树胶乳特异表达基因

采用巴西橡胶树常割树胶乳的Poly(A+)RNA为Tester,叶片Poly(A+)RNA为Driver,通过抑制消减杂交法(suppressivesubtractivehybridization,SSH)构建了一个胶乳特异表达基因差减文库,通过菌落PCR及反式NorthernDot-Blot筛选鉴定阳性差异片段,获得79个胶乳特异表达阳性克隆,部分阳性克隆还通过NorthernBlot杂交及RT-PCR进一步验证。随机挑选部分阳性克隆序列比较分析,结果表明有部分克隆与巴西橡胶树中已知的基因相同,而多数克隆在巴西橡胶树中是新发现,它们与橡胶生物合成、物质代谢运输、信号传导和形态建成等相关。

利用孕妇血浆中的胎儿DNA进行β-地中海贫血的产前诊断

目的利用孕妇血浆中游离胎儿DNA(cffDNA)对广东省最常见17种β地中海贫血的突变基因进行扩增,探讨非创引个伤常性物见产,对位前c点诊ffD和断Nβ9A-个地进少中行见海二位贫次点血P突C的R变可,反的行向共性斑。17点方种杂法β地交贫技①基术羊因检水;测途②β径抽地:取中抽孕海取妇贫孕外血妇周的羊血突水,变共柱基9分例因离,。采法结用提果反取向及9例斑凝孕点胶妇杂回中交收有技纯5术化例检D经N测羊A中,水设国检计人测群3对证8实胎儿有父系的β地贫基因,有2例孕妇外周血中检测到胎儿(父系)β地贫基因,与羊水检测相符。结论利用cffDNA进行β-地中海贫血的检测方法可行,但由于母源性DNA背景的污染,以及胎儿DNA因含量而导致检出率低,希望进一步改进该技术后有望可用于β-地中海贫血的诊断。

不同原理的PCR方法用于地中海贫血产前诊断的验证应用

目的:评估两种不同技术原理的PCR方法用于地中海贫血(下称"地贫")产前诊断的必要性和可行性。方法 :采用双盲法,对509份产前诊断标本分别采用单管多重PCR法(single-tube multiplex PCR,STMP)+反向点杂交法(reverse dot blot,RDB)、探针熔解曲线法(probe melting curve assay,PMCA)检测常见α-地贫和β-地贫基因突变。两种方法所得结果不一致或少见类型地贫突变时,采用DNA测序分析法确诊。所有产前诊断结果均进行验证或随访。结果 :经STMP+RDB、PMCA检测突变谱不同,α-地贫和β-地贫各有1例结果不同。另STMP+RDB检测灵敏度高于PMCA,其差异性在标本受母血污染时有提示作用。结论:两种不同技术原理的PCR方法进行地贫产前诊断,是必要和可行的,两者具有互补性,可确保结果的可靠性和减少单一技术的缺陷。

黑胫病菌诱导的烟草SSH文库构建及其分析

黑胫病是危害严重的世界性烟草主要病害之一,探究烟草对黑胫病的抗病机制,可以为该病的综合防治提供理论依据。本研究以烟草黑胫病抗性品种革新3号为材料,利用黑胫病0号生理小种诱导其水平抗性,分别在接种后0.5、1、3、6、10和16d取样,通过抑制差减杂交技术(SSH)构建cDNA文库,获得了960个阳性克隆。利用反向Northern斑点杂交技术对其中240个阳性克隆进行杂交筛选,筛选出57个表达差异明显的基因,序列拼接后获得33条高质量EST,测序及其比对分析表明,革新3号对烟草黑胫病抗性相关基因主要涉及抗病防卫、光合作用、信号传导和能量代谢等方面。进一步基因功能分析显示,病程相关PR1b蛋白、半胱氨酸蛋白、延伸因子1-α、α-微管蛋白、细胞色素P450、精胺合成酶、水通道蛋白、过氧化物酶体膜蛋白、甘氨酸延伸因子等可能参与了烟草与黑胫病菌非亲和互作过程。