申请人:Siska Diagnostics, Inc.
公开号:US04833251A1
公开(公告)日:1989-05-23
Nucleic acid hybridization probes are provided which comprise an N.sup.4 -(substituted amino)cytosine moiety, wherein the substituted amino group comprises a tag moiety, whereby the probe is detected. Methods of preparing probes of the invention, intermediates used in such methods, and methods of using the probes of the invention in hybridization assays are also provided. Typical tag moieties employed with the probes of the invention are biotinyl, aminothiadiazole and fluorescein derivatives, connected to N.sup.4 -amino groups of modified cytosines of the probe through linker moieties. Probes tagged with biotin are typically detected by binding to the biotinyl moieties, through a streptavidin or avidin molecule, a reporter group which includes streptavidin or avidin and then detecting a signal due to the reporter group. Probes tagged with aminothiadiazole derivatives are typically detected by essentially the same method as those tagged with biotinyl but employing as reporter group one which binds to the derivative through a carbonic anhydrase molecule. Probes tagged with fluorescein derivatives are detected by a fluorescence spectroscopic method without binding of a reporter group to the tag.
提供了包含N.sup.4-(取代氨基)胞嘧啶基团的核酸杂交探针,其中取代氨基团包括一个标记基团,从而可以检测到该探针。还提供了制备本发明探针的方法,用于这种方法的中间体,以及在杂交分析中使用本发明探针的方法。与本发明探针一起使用的典型标记基团包括生物素基团、氨基噻二唑和荧光素衍生物,通过连接基团连接到探针的修饰胞嘧啶的N.sup.4-氨基。通常通过与生物素基团结合来检测标记有生物素的探针,通过链球菌素或亚胺基脲分子,一个包括链球菌素或亚胺基脲的报告基团然后检测由于报告基团而产生的信号。标记有氨基噻二唑衍生物的探针通常通过与标记有生物素的探针基本相同的方法来检测,但使用一个通过碳酸酐酶分子与衍生物结合的报告基团。标记有荧光素衍生物的探针通过荧光光谱方法检测,而无需将报告基团与标记结合。