Cho Jae-Chang, Tiedje James M
Center for Microbial Ecology, Plant and Soil Sciences Bldg., Michigan State University, East Lansing, MI 48824, USA.
Appl Environ Microbiol. 2002 Mar;68(3):1425-30. doi: 10.1128/AEM.68.3.1425-1430.2002.
To quantify target genes in biological samples using DNA microarrays, we employed reference DNA to normalize variations in spot size and hybridization. This method was tested using nitrate reductase (nirS), naphthalene dioxygenase (nahA), and Escherichia coli O157 O-antigen biosynthesis genes as model genes and lambda DNA as the reference DNA. We observed a good linearity between the log signal ratio and log DNA concentration ratio at DNA concentrations above the method's detection limit, which was approximately 10 pg. This approach for designing quantitative microarrays and the inferred equation from this study provide a simple and convenient way to estimate the target gene concentration from the hybridization signal ratio.
为了使用DNA微阵列定量生物样品中的靶基因,我们采用参考DNA来标准化斑点大小和杂交的变化。使用硝酸还原酶(nirS)、萘双加氧酶(nahA)和大肠杆菌O157 O抗原生物合成基因作为模型基因,并使用λDNA作为参考DNA对该方法进行了测试。我们观察到,在DNA浓度高于该方法的检测限(约10 pg)时,对数信号比与对数DNA浓度比之间具有良好的线性关系。这种设计定量微阵列的方法以及本研究推导的方程提供了一种简单便捷的方法,可根据杂交信号比估算靶基因浓度。