简介：Objective:Todetectandquantitategenitalherpessimplexvirus(HSV)DNAinspecimensfrom100patientsclinicallydiagnosedwithgenitalherpes.Methods:PolymeraseChainReaction(PCR)andenzyme-linkedimmunosorbentassay(ELISA)wereusedwithastandardcurveofDNAcopiesofHSVasquantitativecontrast.Results:Ninety-threecaseswereconfirmedHSVpositiveand7caseswerefoundtobenegative.Therewere58casesofHSV-2(62.4%)and35casesofHSV-1(37.6%)amongthe93positivecases.ThenumberofDNAplasmidsrangedfrom115to1.1×l0^5per250pLamongthe93positivesamples(mean=7.1×10^4/250μL).ThenumberofHSVDNAplasmidsrangedfrom136to1.1×l0^5copiesper250pL(mean=7.6×10^4)amongthosewithHSV-2,and115to9.4×10^4per250pL(mean=6.3×10^4)amongthosewithHSV-1.Meanwhile10μLofextractedanddissolvedDNArandomlytakenfrom8eachofHSV-2andHSV-1samplesweretested.ThenumberofHSV-2DNAplasmidsrangedfrom35copiesto2.7×10^4(Mean=l.8×10^4)andthenumberofHSV-1DNArangedfrom29to2.5×10^4(Mean=1.6×10^4).Inthe7negativecases,thequantityofHSVplasmidswaszero.Conclusion:ThesensitivityofELISAquantitation(93%)isequaltothatofSouthernblot.ThesensitivityofPCRfordiagnosisis91%,and88%forPCRtyping.

简介：Objective:ToexploretherelationshipbetweenquantitativeTreponemapallidumDNA(TP-DNA)PCRtestingandtheToludineRedUnheatedSerumTest(TRUST)inpatientswithsyphilisbeforeandaftertreatment,andevaluatetheclinicalvalueofquantitativeTP-DNAtestinginthediagnosisandtreatmentevaluationofsyphilis.Methods:29patientswithprimary(12cases)orsecondary(17cases)syphilis,whometthecriteriasetforthisstudywererecruitedassubjects.Allpatientsweretreatedwith2.4millionunitsbenzathinepenicillinIMweeklyfor3weeks.QuantitativetestsofTP-DNAinthepatients'plasmawereperformedusingFQ-PCRbeforeandafterthetreatment.SerologictestsincludingTRUSTandTPPAwerealsoperformed.Results:Beforethetreatment,9outof12primarysyphilispatients(75%)andallsecondarysyphilispatients(17/17)testedpositiveforTreponemapallidum(TP)byTP-DNAtesting.TheaveragequantitativetestvaluesofTP-DNAinprimaryandsecondarysyphilispatientswere(3.38±2.34)×10^4and(5.73±1.33)×10^6copies/ml,respectively.Afterthreemonthsoftreatment,1ofthe9primaryand5outof17secondarysyphilispatientswerepositiveuponTP-DNAtesting,respectively.TheaveragequantitiesofTP-DNAwere2.01×10^2copies/mlinprimaryand5.87×10^2copies/mlinsecondarysyphilispatientswithpositiveTRUSTandTP-DNAtests,and3.09×10^2copies/mlforthosewithnegativeTRUST,respectively.Afterninemonthsoftreatment,alltheprimaryandsecondarysyphilispatientswerenegativeuponTP-DNAtesting,whileallprimaryand14of17(82.35%)secondarysyphilispatientsshowednegativeTRUSTresults.Conclusion:ThattheresultsofTP-DNAtestsarenotconsistentwiththoseofTRUSTbeforeandaftertreatmentindicatesthatquantitativeTP-DNAtestingmayhavevaluableclinicalsignificanceintheearlydiagnosisandevaluationoftreatmentregimensforsyphilis.

简介：Objectives:Todevelopamulti-nestedpolymerasechainreactioninanassaytodetectearlyTreponemapallidumandHaemophilusducreyiDNAintheswabsofgenitalulcers.Methods:Fourpairsofouterandinnerprimers,specifictothebasicmembraneproteingeneofTreponemapallidumandtothe16srRNAgeneofHducreyiweresynthesized.Themulti-nestedPCRwasdevelopedandappliedtodetectTreponemapallidumandHaemophilusdicreyiinclinicalswabs.Result:ThetwosamplesofstandardstrainsofHaemophilusducreyiandoneTreponemapallidumwereamplifiedandshowed309-bprRNAgeneofHaemophilusducreyiand506-bpDNAofTreponemapalidum,respectively.Outof51samplesofgenitalulcerdetected,29showedTreponemapallidumpositiveproductandnoHaemophilusducreyiDNAwasfound.Conclusion:Themulti-nestedPCRforTreponemapallidumandHaemophilusducreyicouldbeusefulforearlydetectionanddistinguishingdiagnosisbetweensyphilisandchancroid.

简介：对肿瘤研究的不断深入发现除了基因突变之外,表观遗传改变也与肿瘤的发生发展密切相关。肿瘤表观遗传的改变以DNA的异常甲基化为主,其主要的机制是由肿瘤抑制基因启动子超甲基化引起基因沉默。DNA的异常甲基化几乎存在于任何类型的人类肿瘤中,包括皮肤恶性肿瘤。现对DNA甲基化、DNA甲基化与肿瘤、DNA甲基化在基底细胞癌、鳞状细胞癌、黑色素瘤和皮肤淋巴瘤等皮肤恶性肿瘤中的研究进行综述。

简介：细颗粒物（particulatematter,PM2.5）是城市大气的重要污染物,因其粒径小,面积大,活性强,易附带有毒、有害物质如重金属、微生物等,且在大气中的停留时间长、输送距离远,故而对人体健康具有很大影响。目前已有大量关于其致病机制的研究,如机体免疫功能的改变,诱导细胞氧化应激和损害,基因突变和DNA损伤,但具体的致病机制尚未完全明确,该文就以上致病机制进行综述。

简介：Objective:Todevelopasensitive,specificandsimplemethodfordetectionofextremelylownumbersofT.palliduminclinicalspecimens,asasignificantadditiontotheserologictestsforsyphilisdiagnosis.Methods:Double-tubenestedPCR(DN-PCR)andsingle-tubenestedPCR(SN-PCR)assayswereperformedtoamplifyspecificfragmentsoftheDNApolymeraseIgene(polA)ofT.pallidum.SensitivityandspecificityofthetwoPCRassaysweretested.EightysixwholebloodspecimensfrompersonswithsuspectedsyphilisweredetectedbythetwonestedPCRmethods.TheTPPAtestwasusedasacomparisonfordetectingsyphilisinserafromcorrespondingpatients.Results:OnlyspecificampliconscouldbeobtainedduringamplificationoftheT.pallidumpolAgeneandthedetectionlimitwasapproximately1organismwhenanalyzedongelbythetwoPCRmethods.Of86clinicalspecimens,62werepositivebyTPPA.Ofthese,54and51werepositivebytheDN-PCRandSN-PCR,respectively,whichdoesnotrepresentastatisticallysignificantdifferencebetweenthetwoPCRtests.Of24TPPA-negativespecimens,5werepositivebybothDN-PCRassayandSN-PCRassay.Conclusion:TheSN-polAPCRmethodisextremelysensitive,specificandeasytoperformfordetectinglownumbersofT.palliduminclinicalbloodspecimensasacomplementarytoserologyforsyphilisdiagnosis.

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简介：目的：探讨男性不育症患者精子DNA完整性与精子常规参数及形态的相关性。方法：纳入2016年1月至12月于我院就诊的男性不育症患者72例为观察组,同期体检健康男性100例为对照组。采用WLJY-9000型彩色精子质量检测系统检测精液常规参数及精子形态学参数,采用精子染色质扩散法（SCD）分析精子DNA完整性。对比观察组与对照组各检测指标差异。将观察组进一步划分为少精症组（n=16）、弱精症组（n=33）、白细胞精子症组（n=23）,对比各小组检测指标的差异。分析观察组中精子DNA完整性与其它指标的相关性。结果：观察组精子浓度、精子存活率、前向运动精子占比、正常形态精子占比、精子DNA完整性均明显低于对照组,差异有统计学意义（P〈0.05）。少精症组精子浓度最低,弱精症组精子存活率最低,白细胞精子症组前向运动精子占比及正常形态精子占比最低,上述差异均有统计学意义（P〈0.05）。观察组精子DNA完整性与精子浓度、精子存活率、前向运动精子占比、正常形态精子占比均呈正相关（r=0.398、0.304、0.662、0.404,P均〈0.01）。结论：不孕症男性精子DNA完整性、精子浓度、精子存活率、前向运动精子占比、正常形态精子占比均明显下降,且精子DNA完整性与后4项观察指标均呈明显正相关。

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简介：目的：探讨TCT,HC2-HPV-DNA检测和阴道镜检查在宫颈癌及癌前病变筛查中的联合应用价值.方法：1236例女性作为研究对象,依次进行HC2-HPV-DNA检测、TCT检查、阴道镜检查和病理学检查.结果：HC2-HPV-DNA检测,TCT和阴道镜检查的阳性率均显著小于病理学检查阳性率（x2=40.084,P＜0.01;x2=45.008,P＜0.01;x2=50.344,P＜0.01）,上述三项检查中,均为阳性者19例（1.5％）,任意两项阳性者35例（2.8％）,任意一项阳性者78例（6.3％）.结论：TCT,HC2-HPV-DNA检测和阴道镜检查均有一定的局限性,但上述方法联合应用将大大提高筛出率,为患者及时治疗赢得宝贵时间.

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