UNNATURAL POLYMERASE SUBSTRATES THAT CAN SUSTAIN ENZYMATIC SYNTHESIS OF DOUBLE STRANDED NUCLEIC ACIDS FROM A NUCLEIC ACID TEMPLATE AND METHODS OF USE
申请人:Menchen, JR. Steven M.
公开号:US20090269759A1
公开(公告)日:2009-10-29
Nucleotide analogs that can sustain the enzymatic synthesis of double-stranded nucleic acid from a nucleic template are described. The nucleotide analogs include: (i) a base selected from the group consisting of adenine, guanine, cytosine, thymine, uracil and their analogs; (ii) a label attached to the base or analog of the base via a cleavable linker; (iii) a deoxyribose; and (iv) one or more phosphate groups. The linker and/or the label inhibits template directed polymerase incorporation of a further nucleotide substrate onto an extended primer strand. In addition, cleavage of the linker leaves a residue attached to the base which is not present in the natural nucleotide and which does not inhibit extension of the primer strand. The nucleotide analogs can therefore be used as reversible terminators in sequencing by synthesis methods without blocking the 3′ hydroxyl group. Methods of sequencing DNA using the substrates are also described.
本文描述了能够维持从核酸模板中酶促合成双链核酸的核苷酸类似物。这些核苷酸类似物包括:(i)从腺嘌呤、鸟嘌呤、胞嘧啶、胸腺嘧啶、尿嘧啶及其类似物中选择的碱基;(ii)通过可切割的连接基连接到碱基或碱基类似物上的标记;(iii)去氧核糖;以及(iv)一个或多个磷酸基团。连接基和/或标记抑制了模板定向聚合酶将进一步的核苷酸底物合并到扩展引物链上。此外,连接基的裂解留下一个残基连接到碱基上,该残基不在天然核苷酸中存在,也不会抑制引物链的延伸。因此,这些核苷酸类似物可以作为可逆终止子在合成测序方法中使用,而不会阻塞3'羟基。本文还描述了使用这些底物测序DNA的方法。