A rapid and sensitive assay for quantification of siRNA efficiency and specificity.

A rapid and sensitive assay for quantification of siRNA efficiency and specificity.
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DOI:
10.1251/bpo99
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发表时间:
2005
影响因子:
6.4
通讯作者:
Riley PR
Riley PR
中科院分区:
生物学3区
文献类型:
--
作者:
Smart N;Scambler PJ;Riley PR

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RNA干扰已迅速成为一种有效的程序敲低基因表达的模型系统。然而,交叉反应性,其中多个基因可以同时靶向由一个短的干扰RNA(siRNA),可能会危及正确的基因功能的解释。因此,在进行完整的表型分析之前,必须测试siRNA的特异性。为此,我们采用了一种基于荧光素酶的测定法,利用荧光素酶活性的灵敏度来提供相对RNAi功效和特异性的定量读数。我们测试了针对胸腺素β4(Tβ4)的不同siRNA;确定了它们沉默Tβ4的有效性,并排除了Tβ4同源物胸腺素β10(Tβ10)的脱靶沉默,并证明了尽管存在显著(12/23; 52%)序列错配,但Tβ10仍部分敲低。该测定系统适用于存在靶向同源基因风险的任何RNAi研究,并适用于在微阵列表达谱分析后在基因组水平上监测脱靶效应。
RNA Interference has rapidly emerged as an efficient procedure for knocking down gene expression in model systems. However, cross-reactivity, whereby multiple genes may be simultaneously targeted by a single short interfering RNA (siRNA), can potentially jeopardize correct interpretation of gene function. As such, it is essential to test the specificity of a siRNA prior to a full phenotypic analysis. To this end, we have adapted a reporter-based assay harnessing the sensitivity of luciferase activity to provide a quantitative readout of relative RNAi efficacy and specificity. We have tested different siRNAs directed against Thymosin β4 (Tβ4); determined their effectiveness at silencing Tβ4 and have both excluded off-target silencing of the Tβ4 homologue Thymosin β10 (Tβ10) and demonstrated partial knockdown of Tβ10 despite significant (12/23; 52%) sequence mismatch. This assay system is applicable to any RNAi study where there is a risk of targeting homologous genes and to the monitoring of off-target effects at the genome level following microarray expression profiling.
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