简介:TheDNAcontentandmorphometricfeaturesofhepatocellularcarcinoma(HCC)andlivercelldysplasia(LCD),includingnucleararea,nuclearperimeter,nuclearmaximumdiameterandnuclearcirclediameter,werequantitativelydeterminedbymeansofimageanalysistechnology.Theresultsshowedthatincomparisonwithnormalhepatocytes,LCDhadamarkedlyincreasedDNAcontentandnuclearmorphometricparameters,butthevalueswerelowerthanthoseforHCC.LCDshowedaslightincreaseinnuclearatypiarepresentedbythenuclearirregularindex,whichwasalsolessthanHCC.ThefindingsindicatethatLCDmaybeaprecaneerouslesionofHCC,tothecellsinanabnormalproliferativestate.
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:Meiotic前期我是一个长、复杂的阶段。相应再结合是在meiotic前期期间发生在相应染色体之间的一个重要过程我。chiasmata的形成,它一起保持相应染色体直到中期我到后期,我转移,为合适的染色体分离是批评的。最近的研究建议了SPO11蛋白质在产生被认为是相应再结合的起点的双strandedDNA裂缝(DSB)的地点在很多个有机体保存了功能。DSB的这些地点处理要求RecA相当或相同的事物的功能,例如RAD51,DMC1,和其它,由变异的研究建议了;因此,修理这些meioticDSB的失败导致反常chromosomal引申,导致破坏成熟分裂。这些RecA相当或相同的事物的功能上的最近的发现改进了位于meiotic下面的机制的理解相应再结合。
简介:目的探讨无创DNA产前检测在产前诊断中的应用及价值。方法对2012年1月至2014年12月在西京医院妇产科做羊水穿刺的病人资料回顾性分析,发现因无创阳性做羊水穿刺的孕妇84例,用羊水染色体核型分析和FISH对其结果进行验证,并对两者不一致的结果进行电话随访。结果无创DNA84例阳性结果中21-三体48例,经羊水穿刺后确认为假阳性的有2例;18-三体11例,经羊水穿刺后确认为假阳性3例;13-三体4例,经羊水穿刺验证2例为假阳性;性染色体异常21例,经验证6例假阳性。结论孕妇外周血中游离胎儿DNA检测对21-三体检测准确率达95.8%,18-三体准确率73%,性染色体检出准确率71%,13-三体准确率50%。无创DNA是产前筛查21-三体的有效方法,对其他染色体异常的检测还需要进一步提高现有检测技术。
简介:男不孕可能清楚地在人的精子与异常DNAmethylation模式被联系。在氧化应力和精子染色体的全球methylation地位之间的一个协会也被建议了。现在的学习的目的是决定全球精子DNAmethylation地位是否在染色体的搬运人的精子被影响结构的错误。在5-methylcytosine之间的关系(m5C)在精子和染色质正直地位的层次被评估。学习病人包括了染色体的男搬运人有繁殖失败的结构的错误(n=24),并且控制包括了normozoospermic精子志愿者(n=23)。全球m5C水平用薄层的层析(TLC)和immunofluorescence被测量(如果)技术。精子染色质正直用染色的苯胺蓝色(AB)和TUNEL试金被估计。吝啬的m5C层次在调查染色体之间是类似的结构的错误搬运人(P)和控制(K)。然而,精子染色质完整测试比在控制在chromosomal重新整理搬运人揭示了显著地更高的值(P<;0.05)。尽管在精子染色质正直地位和精子DNA破碎和m5在两个都分析的组(P对K)并列的C水平以一种清楚地相反的方式被代表,低染色质正直可能与在染色体的搬运人观察的精子DNA的高hypomethylation地位被联系结构的错误。
简介:DNAbarcodingisapowerfulapproachforcharacterizingspeciesoforganisms,especiallythosewithalmostidenticalmorphologicalfeatures,therebyhelpingtotoestablishphylogeneticrelationshipsandrevealevolutionaryhistories.Inthisstudy,wechosea648-bpsegmentofthemitochondrialgene,cytochromecoxidasesubunit1(COI),asastandardbarcoderegiontoestablishphylogeneticrelation-shipsamongbrineshrimp(Artemia)speciesfrommajorhabitatsaroundtheworldandfurtherfocusedonthebiodiversityofArtemiaspeciesinChina,especiallyintheTibetanPlateau.SamplesfromfivemajorsaltlakesoftheTibetanPlateaulocatedataltitudesover4,000mshowedcleardifferencesfromotherArtemiapop-ulationsinChina.Wealsoobservedtwoconsistentaminoacidchanges,153A/Vand183L/F,intheCOIgenebetweenthehighandlowaltitudespeciesinChina.Moreover,indelsintheCOIsequencewereidentifiedincystandadultsamplesuniquetotheCoQenpopulationfromtheTibetanPlateau,demonstratingtheneedforadditionalinvestigationsofthemitochondrialgenomeamongTibetanArtemiapopulations.
简介:RecognitionofDNAdamageisacriticalstepforDNAdamage-mediatedcellularresponse.XPCisanimportantDNAdamagerecognitionproteininvolvedinnucleotideexcisionrepair(NER).WehavestudiedtheXPCproteinincisplatinDNAdamagingtreatment-mediatedcellularresponse.ComparisonofthemicroarraydatafrombothnormalandXPCdefectivehumanfibroblastsidentified861XPC-responsivegenesinthecisplatintreatment(withminimumfoldchange≥1.5).Thecellcycleandcellproliferation-relatedgenesarethemostaffectedgenesbytheXPCdefectinthetreatment.Manyothercellularfunctiongenes,especiallytheDNArepairandsignaltransduction-relatedgenes,werealsoaffectedbytheXPCdefectinthetreatment.Tovalidatethemicroarraydata,thetranscriptionlevelsofsomemicroarray-identifiedgeneswerealsodeterminedbyanRT-PCRbasedrealtimePCRassay.TherealtimePCRresultsareconsistentwiththemicroarraydataformostofthetestedgenes,indicatingthereliabilityofthemicroarraydata.Tofurthervalidatethemicroarraydata,thecisplatintreatment-mediatedcaspase-3activationwasalsodetermined.TheWesternblothybridizationresultsindicatethattheXPCdefectgreatlyattenuatesthecisplatintreatment-mediatedCaspase-3activation.Weelucidatedtheroleofp53proteinintheXPCproteinDNAdamagerecognition-mediatedsignalingprocess.TheXPCdefectreducesthecisplatintreatment-mediatedp53response.TheseresultssuggestthattheXPCproteinplaysanimportantroleinthecisplatintreatment-mediatedcellularresponse.Itmayalsosuggestapossiblemechanismofcancercelldrugresistance.