申请人:E. I. Du Pont de Nemours and Company
公开号:US05608063A1
公开(公告)日:1997-03-04
A DNA sequencing system and method are described to detect the presence of radiant energy emitted from different excited reporter dye-labeled species (DNA fragments) following separation in time and/or space, and the identity of the species which emit radiant energy closely spaced in wavelength. Functions of the emitted energy are obtained which vary over the wavelengths of the closely spaced spectra in different senses and the functions ratioed, whereby the ratio is indicative of the identity of the DNA fragments. The emitting portion of the reporter-labeled DNA fragment is preferably one of a family of fluorescent dyes based on 9-carboxyethyl-6-hydroxy-3 -oxo-3H-xanthene. These xanthene dyes are covalently attached to the DNA fragments through the carboxylic acid functionality, preferably via an amide linkage. The dyes may be protected by including an alkoxy group at the 9-position. A spacer may be inserted between the dye and the amine. The fluorescent dye preferably is attached to the DNA chain terminators and provides many advantages. Thus only DNA sequencing fragments resulting from bona fide termination events will carry a reporter. The DNA sequencing may also be labeled using the xanthene dyes which have general utility as fluorescent labels. Also acyclonucleoside triphosphates are described as being useful as chain terminators in DNA sequencing using a modification of the Sanger method.
本文介绍了一种DNA测序系统和方法,用于检测不同激发报告染料标记物(DNA片段)分离后发射的辐射能量的存在,并且在波长紧密相邻的物种中发射辐射能量的身份。获得的发射能量函数在不同的波长范围内以不同的方式变化,并且对函数进行比率,因此比率表明DNA片段的身份。报告标记的DNA片段的发射部分最好是基于9-羧基乙基-6-羟基-3-氧代-3H-黄色素的荧光染料家族之一。这些黄色素染料通过羧酸功能性与DNA片段共价连接,最好通过酰胺键连接。染料可以通过在9位点包括烷氧基来保护。染料和胺之间可以插入间隔物。荧光染料最好连接到DNA链终止剂上,并提供许多优点。因此,只有由真正的终止事件产生的DNA测序片段才会携带报告。DNA测序也可以使用具有一般荧光标记实用性的黄色素染料进行标记。此外,本文还描述了使用Sanger方法的修改来使用无环核苷酸三磷酸盐作为链终止剂的有用性。