简介:摘要目的分析结肠癌全基因组DNA差异甲基化位点(DMS)及差异甲基化基因(DMG)水平,寻找结肠癌相关甲基化基因。方法在山东大学齐鲁医院结肠癌组织标本库中,随机数表法抽取5份结肠癌组织和配对癌旁组织,采用甲基化修饰依赖性内切酶测序法(Methyl-Rad)进行全基因组DNA甲基化测序,Edge R方法筛选DMS,并比较基因组不同功能元件上DMS的分布,对DMS绘制组间甲基化水平差异热图;进一步筛选DMG,对DMG进行Gene Ontology (GO)和Kyoto Encyclopedia of Genes and Genomes (KEGG)功能富集分析。同时,下载肿瘤基因组图谱(TCGA)数据库RNA测序数据分析差异表达RNA,将DMG和差异表达RNA共分析获得潜在的结肠癌相关甲基化基因,并采用实时荧光定量聚合酶链反应(RT-qPCR)和焦磷酸测序方法在30对结肠癌和癌旁组织中进行结肠癌相关甲基化基因的双向验证。基因的表达量和甲基化水平在结肠癌肿瘤组织和癌旁组织的差异采用配对样本的秩和检验进行统计学分析。结果共筛选出132 999个 CCGG和8 487个CCWGG DMS,其中CCGG和CCWGG的DMS主要分布在内含子区,比例分别为50.47%(67 127/132 999)和48.79%(4 141/8 487)。共发现1 359个CCGG和1 052个CCWGG DMG,对DMG进行GO和KEGG功能富集分析。DMG和差异表达RNA共分析发现113个结肠癌相关基因,其中14个基因在结肠癌组织中呈高甲基化且低表达,99个基因呈低甲基化且高表达。RT-qPCR和焦磷酸测序实验证实MAFA-AS1和MS4A18在结肠癌组织中呈高甲基化且低表达,而SMAD1-AS2、ARHGEF3-AS1和LOC440084则呈低甲基化且高表达,与测序结果一致(P<0.05)。结论DNA甲基化为结肠癌提供了潜在的生物标志物,并为结肠癌发生发展的分子机制提供了新的思路。
简介:Halogenationofthepotassiumorsilversaltsofbis(trifluoromethanesulfonyl)methane(CF3SO2)2CH2anditscycloanalogues1withN-fluoro-bis(trifluoromethanesulfonyl)imine[(CF3SO2)2-NF],chlorineorbrominegavegoodyieldsofthecorrespondingα-halodisulfone(CF3SO2)2CHXandcycloanalogues9,10.Thechemicaltransformationofthesefluorinatedα-halo-disulfonesaredescribed.
简介:Thekineticsofsuspendedemulsionpolymerizationofmethylmethacrylate(MMA),inwhichwateractedasthedispersedphaseandthemixtureofMMAandcyclohexaneasthecontinuousphase,wasinvestigated.Itshowedthattheinitialpolymerizationrate(Rp0)andsteady-statepolymerizationrate(Rp)wereproportionaltothemassratiobetweenwaterandoilphase,andincreasedasthepolymerizationtemperature,thepotassiumpersulphateconcentration([I])andtheTween20emulsifierconcentration([S])increased.Therelationshipsbetweenthepolymerizationrateand[I]and[S]wereobtainedasfollows:Rp0∝[I]0.73[S]0.32andRp∝[I]0.71[S]0.23.TheaboveexponentswereclosetothoseobtainedfromnormalMMAemulsionpolymerization.Italsoshowedthattheaveragemolecularweightoftheresultingpoly(methylmethacrylate)decreasedasthepolymerizationtemperature,[I]and[S]increased.Thus,MMAsuspendedemulsionpolymerizationcouldbeconsideredasacombinationofmanyminiatureemulsionpolymerizationsproceedinginwaterdropsandobeyedtheclassicalkineticsofMMAemulsionpolymerization.
简介:Theenzymaticresolutionofracemicmethyl3-phenylglycidatewasinvestigated.Itwasfoundthatthehydrolysisrateof(2S,3R)-enantiomerwasfasterthanthatof(2R,3S)-enantiomerbyanewlipase.Atoptimalcondition96%of(2R,3S)-methylphenylglycidatewitheeof100%wasrecoveredfromtheracemicmixture.
简介:Bothdirectandsensitizedirradiationsoftheendotitlecompoundleadtoadecarbony-lationproduct,4-isopropylbiphenyl,viaNorrishType1reaction,whiletheexoisomergivesacarbeneintermediateandsubsequentlyformaldehyde2-biphenylylisopropylhemiacetal,whichinturngraduallydecomposestodimethylphenylbenzylalcoholatroomtemperature.Thetripletpathwaydominatesthephotoreactionoftheexoisomer.Thesingletandtripletlifetimesofthereactantarefoundtobe0.29nsand5.4μs,respectively.~3(n,π~*),~1(n,π~*),~3(π,π~*)electronicconfigurationsoftheexoisomerand~3(π,π~*)oftheendoisomerarephotochemicallyactive,but~1(π,π~*)oftheendoisomershowsindirectphotoreactivity.
简介:Macroporousmethylacrylate-divinylbenzenecopolymersweresynthesizedandmodifiedbypolyethylenepolyamine.TheaminoacylasefromAspergillusoryzaewasadsordedonthesemodifiedcopolymers.Theroleofcertainfactorssuchasdegreeofcross-linking,amountofporegenicsolvent,modifyingagentandporestructures,intheactivityofimmobilizedaminoacylasewasstudied.EffectsofadsorptiontimeandamountofenzymeusedontheactivityofaminocylaseimmobilizedonMMD-12-13werealsoinvestigated.ThecolumnofaminoacylaseimmobilizedonMMD-12-13waspreparedandN-acyl-DL-methioninewasresolvedcontinuouslyforamonth,theremainingactivitywasstillover90%.
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简介:TheNb-bromomethylderivative(2)ofgelsemine,aquaternaryammoniumsalt,wasfoundtoberecalcitranttowardHofmanntypealkalinedegradationwhichhasbeensuccessfulinothercases.Instead,are-distributionoftheN-methylgrouptookplace,givingriseto3a,1,3band3c,indescendingorderofRfvalues.