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首页> 外文期刊>The American Journal of Tropical Medicine and Hygiene >Estimation of copy number using SYBR Green: confounding by AT-rich DNA and by variation in amplicon length.
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Estimation of copy number using SYBR Green: confounding by AT-rich DNA and by variation in amplicon length.

机译:使用SYBR Green估算拷贝数:被富含AT的DNA和扩增子长度的变化所混淆。

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摘要

Although SYBR Green is used to estimate copy number, its fluorescence varies with amplicon length and adenine/thymine (AT) content. As a result, threshold cycle (Ct) values obtained using real-time polymerase chain reaction (PCR) are lower for longer amplicons (P<0.001) and amplicons with greater AT content (P<0.001). In contrast, neither amplicon length nor AT content affects the Ct with TaqMan probes or LUX-labeled primers. Because SYBR Green yields lower Cts with AT-rich templates and longer templates, it overestimates copy number for those templates. Therefore, sequence-specific methods such as TaqMan probes or LUX-labeled primers should be considered when using real-time PCR to estimate copy number if the amplicons generated are AT-rich or vary in length.
机译:尽管SYBR Green用于估算拷贝数,但其荧光随扩增子长度和腺嘌呤/胸腺嘧啶(AT)含量而变化。结果,对于更长的扩增子(P <0.001)和具有更高AT含量的扩增子(P <0.001),使用实时聚合酶链反应(PCR)获得的阈值循环(Ct)值较低。相反,使用TaqMan探针或LUX标记的引物,扩增子的长度和AT含量均不会影响Ct。由于SYBR Green使用富含AT的模板产生的Cts较低,而模板更长,因此高估了这些模板的拷贝数。因此,如果生成的扩增子富含AT或长度变化,则在使用实时PCR估计拷贝数时,应考虑使用TaqMan探针或LUX标记的引物等序列特异性方法。

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