申请人:The society for Techno-Innovation of Agriculture, Forestry and Fisheries
公开号:EP0810291A1
公开(公告)日:1997-12-03
A probe for detecting nonradioactive nucleic acids by the hybridization technique, and a highly sensitive and highly selective method for the detection. The probe comprises a set of two or more oligonucleotide probes that can hybridize perfectly complementarily with the specific portion of the sequence of the consecutive bases of the target nucleic acid, each oligonucleotide probe being labeled at the 5' or 3' end thereof with a chromophoric group having a suitable spatial arrangement so that adjacent chromophoric groups can yield an excimer or the like when each probe hybridizes with the target nucleic acid. More specifically, although the probe of the invention comprises a set of two or more labeled probes and the labeling groups to be detected are present each on a different probe, the labeling groups take such a spatial arrangement that the two chromophoric groups present on the two probes which have come to exist adjacent to each other only after the hybridization with the target nucleic acid induce unique phenomena such as excimer fluorescence, thereby enabling the target nucleic acid to be detected with a high recognizability. Thus the probe of the invention enables the erroneous recognition which has been problematic heretofore to be reduced remarkably and the types of utilizable labeling groups to be varied widely. Further it is possible to improve the detection sensitivity remarkably because it is possible to reduce the background noise remarkably. In addition, it is possible to discriminate a number of (single-base variation) nucleic acids that are different from one another in only one base present at a specific position to be detected, which has been difficult heretofore.
一种通过杂交技术检测非放射性核酸的探针,以及一种高灵敏度和高选择性的检测方法。该探针包括一组能与目标核酸的连续碱基序列的特定部分完美互补杂交的两个或多个寡核苷酸探针,每个寡核苷酸探针的 5' 或 3' 端都标记有一个具有适当空间排列的发色基团,这样当每个探针与目标核酸杂交时,相邻的发色基团可以产生一个准分子或类似物。更具体地说,虽然本发明的探针由一组两个或两个以上的标记探针组成,而且要检测的标记基团分别存在于不同的探针上,但标记基团的空间排列方式使存在于两个探针上的两个发色基团仅在与目标核酸杂交后才相邻存在,从而诱发独特的现象,如准分子荧光,从而使目标核酸的检测具有较高的可识别性。因此,本发明的探针能显著减少之前一直存在的错误识别问题,并能使可使用的标记基团的类型多样化。此外,由于可以明显降低背景噪声,因此可以显著提高检测灵敏度。此外,还可以分辨出许多(单碱基变异)核酸,这些核酸彼此不同,只有一个碱基存在于要检测的特定位置,而这在以前是很难做到的。