The invention provides methods for conducting hybridizations having increased selectivity of hybridization using substrates upon which probe nucleic acids are immobilized. The methods of this invention can be used to increase selectivity in nucleic acid diagnostic devices, such as biosensors and microarrays. The invention provides increased selectivity through control of the substrate surface chemistry and in particular, through control of the density of nucleic acids and other oligomers immobilized on a surface. The invention provides improved signal to noise in hybridization assays via enhanced differences in signal magnitude generated for fully matched target nucleic acid compared to partially matched target nucleic acid prior to signal processing. Specifically, invention provides methods for using substrates having medium-high to high immobilization densities to achieve higher hybridization The methods and substrates of this invention are particularly well-suited to assays for genetic targets in samples that contain genetic species that are very similar in nucleic acid sequence to the genetic target. The methods and substrates of this invention are also well-suite for single nucleotide polymorphism (SNP) analysis.
本发明提供了使用基于探针核酸固定的基板进行杂交的方法,以增加杂交的选择性。本发明的方法可用于增加核酸诊断设备(如
生物传感器和微阵列)中的选择性。通过控制基板表面
化学性质,特别是通过控制固定在表面上的核酸和其他寡聚物的密度,本发明提供了增加的选择性。本发明通过增强完全匹配目标核酸与部分匹配目标核酸之间产生的信号差异来提高杂交检测的信噪比,然后进行信号处理。具体而言,本发明提供了使用具有中高至高固定密度的基板来实现更高的杂交的方法。本发明的方法和基板特别适用于包含与
基因靶点的核酸序列非常相似的
基因物种的样品中的遗传目标的检测。本发明的方法和基板也非常适用于单核苷酸多态性(SNP)分析。