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1、·1236·中國(guó)生物制品學(xué)雜志2009年12月第22卷第12期ChinJBiologicalsDecember2009,Vol.22No.12中國(guó)圖書(shū)分類(lèi)號(hào)Q789文獻(xiàn)標(biāo)識(shí)碼A文章編號(hào)1004-5503(2009)12-1236-05【實(shí)驗(yàn)技術(shù)】實(shí)時(shí)熒光定量PCR檢測(cè)畢赤酵母基因組中外源基因拷貝數(shù)宣姚吉周祥山張?jiān)d【摘要】目的建立實(shí)時(shí)熒光定量PCR檢測(cè)畢赤酵母基因組中外源基因拷貝數(shù)的方法。方法采用雙標(biāo)準(zhǔn)曲線法,分別利用含有GAP基因和綠色熒光蛋白(GFP)基因的質(zhì)粒,進(jìn)行實(shí)時(shí)熒光定量PCR反應(yīng),建立標(biāo)準(zhǔn)曲線。將含有外源GFP基因的畢赤酵母基因組進(jìn)行實(shí)時(shí)熒光定量PCR,通過(guò)標(biāo)準(zhǔn)曲
2、線計(jì)算出外源GFP基因在畢赤酵母基因組中的拷貝數(shù)。結(jié)果畢赤酵母GAP基因Ct值與起始拷貝數(shù)對(duì)數(shù)的回歸方程為:y=-3.612x+39.28,GFP基因Ct值與起始拷貝數(shù)對(duì)數(shù)的回歸方程為:y=-3.544x+37.99,GAP基因和GFP基因的反應(yīng)效率分別為0.89和0.90,兩條標(biāo)準(zhǔn)曲線的相關(guān)系數(shù)均為0.999,且均有良好的重復(fù)性。檢測(cè)10個(gè)轉(zhuǎn)入GFP基因的畢赤酵母菌株,篩選到9個(gè)單拷貝整合GFP基因的菌株和1個(gè)多拷貝整合GFP基因的菌株。結(jié)論已建立了檢測(cè)畢赤酵母基因組中外源基因拷貝數(shù)的實(shí)時(shí)熒光定量PCR法,該方法能夠篩選出不同外源基因拷貝數(shù)的畢赤酵母菌株?!娟P(guān)鍵詞】實(shí)時(shí)熒光定
3、量PCR;畢赤酵母;基因拷貝數(shù)DeterminationofCopyNumberofForeignGeneinGenomeofPichiapastorisbyReal-timeFluorescentQuantitativePCRXUANYao-ji,ZHOUXiang-shan,ZHANGYuan-xing(StateKeyLaboratoryofBioreactorEngineering,EastChi-naUniversityofScienceandTechnology,Shanghai200237,China)【Abstract】ObjectiveTodevelopame
4、thodfordeterminationofthecopynumberofforeigngeneingenomeofPichiapastorisbyreal-timefluorescentquantitativePCR.MethodsThestandardcurvesofGAPandGFPgenesweregeneratedwiththeplasmidscontainingGAPandGFPgenesrespectively,andthegenomicDNAofP.pastoristransformantscontainingGFPgenewasanalyzedbyreal-t
5、imefluorescentquantitativePCR.ThecopynumberofGFPgeneineachtransformantwascalculatedwiththeCtvalueofP.pastorisgenomicDNAandthestandardcurve.ResultsTheregressionequationofCtvalueandlogarithmoforiginalcopynumberofGAPgenewasy=-3.612x+39.28,whilethatofGFPgenewasy=-3.544x+37.99.Thereactionefficien
6、ciesofGFPandGAPgeneswere0.89and0.90respectively.However,boththecorrelationcoefficientsofstandardcurvesofthetwogeneswere0.999,andboththecurvesshowedgoodreproducibility.OfthetenP.pastoristransformantstested,ninecontainedonecopyandonecontainedmultiplecopiesofGFPgene.ConclusionAreal-timefluoresc
7、entquantitativePCRmethodwassuccessfullydeveloped,whichmightbeusedforscreeningofP.pastoristransformantscontainingvariouscopiesofforeigngenes.【Keywords】Real-timefluorescentquantitativePCR;Pichiapastoris;Genecopynumber[3]在畢赤酵母中,外源基因能夠在基因組的同一數(shù)。但相關(guān)文獻(xiàn)報(bào)道較