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染料法如何實現(xiàn)qPCR的實時監(jiān)控呢?

時間:2023/10/7閱讀:185
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熒光定量PCR是利用熒光信號的變化實時檢測PCR擴(kuò)增中每一個循環(huán)擴(kuò)增產(chǎn)物量的變化,并進(jìn)行定量分析。我們通常使用染料法實現(xiàn)qPCR的實時監(jiān)控,那么染料法如何實現(xiàn)qPCR的實時監(jiān)控呢?
染料法就是在PCR反應(yīng)體系中加入熒光基團(tuán),我們常用的染料就是SYBR Green Ⅰ這種染料。這種染料有以下特性:該染料可以非特異地結(jié)合在雙鏈DNA小溝上,而不與單鏈結(jié)合。這里的非特異性是指,只要是雙鏈DNA,它都能結(jié)合上去,不管該雙鏈DNA是否是你期望擴(kuò)增的目標(biāo)基因還是非目標(biāo)基因。這種染料在游離狀態(tài)下幾乎不會產(chǎn)生熒光,因此儀器也就沒有反應(yīng),一旦染料結(jié)合了雙鏈DNA就會產(chǎn)生較強(qiáng)的熒光信號,儀器也就有所反應(yīng)。
那么,具體在擴(kuò)增過程中。首先,在擴(kuò)增的起始階段,經(jīng)過熱變形雙鏈DNA發(fā)生解鏈變成單鏈,染料結(jié)合不上去,因此就沒有熒光信號。隨著反應(yīng)的進(jìn)行,有雙鏈形成之后,染料就會結(jié)合在雙鏈形成的小溝上。每形成一個DNA雙鏈,就有一定數(shù)量的染料結(jié)合上去;染料一結(jié)合,就產(chǎn)生熒光信號;信號強(qiáng)度與DNA分子總數(shù)目成正比。那么在PCR的每一個循環(huán)中這種熒光信號的積累過程就能被儀器所實時監(jiān)控。
當(dāng)然,由于SYBR Green Ⅰ是非特異性結(jié)合在雙鏈上,所以一旦在PCR擴(kuò)增過程中有非特異性產(chǎn)物的生成,它也會產(chǎn)生被儀器所檢測到的熒光信號,這種非特異性的信號與特異性的信號由于無法區(qū)分就會導(dǎo)致實驗結(jié)果的不準(zhǔn)確性。
通常,為了保證我們實驗結(jié)果的準(zhǔn)確性。我們在做染料法時,通常都會做熔解曲線,來幫我們判斷實驗結(jié)果是否可靠。


SYBR Green I染料法的化學(xué)原理示意圖
更多有關(guān)于染料法如何實現(xiàn)qPCR的實時監(jiān)控的問題,歡迎給百奧創(chuàng)新留言哦~



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