申请人:——
公开号:US20030055233A1
公开(公告)日:2003-03-20
The invention provides improved methods and devices for the detection and identification in a sample of one or more target molecules which bind to probe molecules, particularly to nucleic acid probe molecules. The improved method is based on contacting the sample with a surface that is coated with one or more gradients of probe molecules, particlarly nucleic acid or nucleic acid analog probe molecules that serve to bind target molecules in the sample, particularly nucleic acids having sequences that are complementary or partially complementary to one or more probe molecules. A probe gradient generated on the surface is formed by the variation of a physical, structural or functional property of the probes on the surface. The gradient is generated, e.g., by varying density of probe molecules bound to the surface, by varying probe sequence length, by varying probe sequence, by varying probe sequence type, by varying the orientational structure of probes, and by varying the concentration of label associated with probes. Determination of the location, speed and/or extent of hybridisation of a nucleic acid on such a gradient surface is useful to identify target molecules bound to probes and/or to quantitatively measure the amount of the target in a sample. Hybridisation of target molecules to a gradient of nucleic acid probe can be examined as a function of time and/or hybridisation conditions (e.g., temperature, salt concentration, etc.) The methods and devices of this invention employ gradient surfaces to bind to one or more target molecules, particularly nucleic acids (or target sequences) in a sample, detecting their presence in the sample and quantitating the amount of one or more of such targets in a sample.
本发明提供了在样品中检测和识别与探针分子,特别是与核酸探针分子结合的一种或多种目标分子的改进方法和装置。改进的方法是将样品与涂有一种或多种探针分子梯度的表面接触,特别是核酸或核酸类似物探针分子,它们可与样品中的目标分子结合,尤其是具有与一种或多种探针分子互补或部分互补序列的核酸。表面上产生的探针梯度是由表面上探针的物理、结构或功能特性的变化形成的。产生梯度的方式包括:改变与表面结合的探针分子的密度、改变探针序列长度、改变探针序列、改变探针序列类型、改变探针的定向结构以及改变与探针相关的标签浓度。确定核酸在这种梯度表面上杂交的位置、速度和/或程度,有助于识别与探针结合的靶分子和/或定量测量样品中的靶分子量。目标分子与核酸探针梯度的杂交可作为时间和/或杂交条件(如温度、盐浓度等)的函数进行检测。 本发明的方法和装置利用梯度表面与一个或多个目标分子,特别是样品中的核酸(或目标序列)结合,检测它们在样品中的存在,并定量测定样品中一个或多个此类目标的量。