資源描述:
《干擾afp蛋白表達(dá)的shrna表達(dá)載體的構(gòu)建及活性鑒定》由會員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、干擾AFP蛋白表達(dá)的shRNA表達(dá)載體的構(gòu)建及活性鑒定作者:張國英劉明社趙中夫*張蕓楊慧武延雋【摘要】 目的:利用含報(bào)告基因EGFP的pGenesil-1質(zhì)粒構(gòu)建干擾AFP蛋白表達(dá)的短發(fā)夾RNA(shorthairpinRNA,shRNA)表達(dá)的載體,并進(jìn)行活性鑒定。方法:設(shè)計(jì)表達(dá)短發(fā)夾RNA的互補(bǔ)DNA序列,經(jīng)退火成雙鏈,克隆至帶有U6啟動子的質(zhì)粒載體pGenesil-1中,構(gòu)建重組質(zhì)粒,轉(zhuǎn)化大腸桿菌DH5α菌株,擴(kuò)增,提取質(zhì)粒,酶切鑒定后測序分析。構(gòu)建正確的重組質(zhì)粒經(jīng)脂質(zhì)體轉(zhuǎn)染HepG2細(xì)胞,檢測轉(zhuǎn)染率和培養(yǎng)細(xì)胞上清
2、的AFP含量變化,確定重組質(zhì)粒的活性。結(jié)果:構(gòu)建了靶向AFP蛋白的2個(gè)shRNA重組質(zhì)粒載體pGenesil-1-siAFP1和pGenesil-1-siAFP2。酶切鑒定和測序分析,shRNA編碼序列與設(shè)計(jì)的片段完全一致,經(jīng)酶切凝膠電泳證實(shí)載體構(gòu)建成功。重組質(zhì)粒有效轉(zhuǎn)染HepG2細(xì)胞并顯著抑制AFP表達(dá)。結(jié)論:成功構(gòu)建具有活性的、能夠表達(dá)shRNA靶向干擾AFP蛋白的2個(gè)重組質(zhì)粒載體。【關(guān)鍵詞】AFP蛋白 RNAi shRNA 重組質(zhì)粒載體AbstractObjective:Toconstructtherecombina
3、ntplasmidexpressingtwoAFP-targetedshorthairpinRNA(shRNA)withpGenesil-1plasmidsvector,andDetecttheActivityof11RecombinantPlasmidinHepG2cells.Methods:TwopairsofDNAsequencesweredesignedandsynthesized,andformedcomplementarychainsbyannealingrespectively.Thentheobtained
4、products,siAFP1andsiAFP2,wereinsertedintoplasmidvectorpGenesil-1withU6promoter.TherecombinantplasmidsweretransformingintotheEscherichiacolistrainDH5αforscreeningandamplifying.ThesequenceanalysisoftheplasmidsandidentifiedbySalIdigestionwascarriedout.Thebiologicalac
5、tivityofrecombinantplasmidwasdetectedbytransfectingintotheHepG2cellline.Results:ThetwoAFP-targetedshRNAsexpressingframeweresuccessfullyinsertedintothepGensil-1plasmidvectorrespectively,andtheobtainedshRNAscodingsequenceswereconsistentwiththedesignedfragments.There
6、combinantplasmidinhibitedeffectivelytheexpressionofAFPgeneinHepG2cells.Conclusion:TheconstructionoftworecombinantplasmidsofAFP-targetedshRNAwassuccessful.TworecombinantplasmidsexpressingAFP-targetedshRNAinhibitedeffectivelytheexpressionofAFPgeneinHepG2cells.KeyWor
7、dsAFP;RNAinterference;ShorthairpinRNA;HepG2cells11長期以來,人們只是把AFP作為一個(gè)腫瘤標(biāo)志物,用于原發(fā)性肝癌(HCC)的診斷指標(biāo)之一。諸多研究關(guān)注于檢測甲胎蛋白(alpha-fetoprotein,AFP)對原發(fā)性肝癌診斷運(yùn)用,而對AFP和腫瘤細(xì)胞發(fā)生及增殖的關(guān)系并不完全清楚[1~3]。近年發(fā)展起來的RNA干擾(RNAinterference,RNAi)技術(shù)為探索AFP的生物學(xué)功能提供了有力的工具。RNAi技術(shù)是通過導(dǎo)入細(xì)胞19nt~23nt的小分子干擾RNA(small
8、interferenceRNA,siRNA),降解同源mRNA,高效、特異性阻斷目的基因表達(dá)[4~7]。本研究針對人AFP基因設(shè)計(jì)了2個(gè)位點(diǎn)的shRNA表達(dá)序列,用人U6啟動子和RNApolymeraseⅢ(PolⅢ)終止信號,構(gòu)建針對AFP的特異性shRNA真核表達(dá)載體,并轉(zhuǎn)染HepG2細(xì)胞鑒定活性,