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    • 5. 发明授权
    • Method for in vitro recombination
    • 体外重组方法
    • US07776532B2
    • 2010-08-17
    • US11502624
    • 2006-08-11
    • Daniel Glenn GibsonHamilton O. Smith
    • Daniel Glenn GibsonHamilton O. Smith
    • C12Q1/68C12P19/34C07H21/02C07H21/04
    • C12N9/1252C12N15/10C12N15/102C12N15/1031C12N15/64C12N15/66C12P19/34
    • The present invention relates, e.g., to an in vitro method, using isolated protein reagents, for joining two double-stranded (ds) DNA molecules of interest, wherein the distal region of the first DNA molecule and the proximal region of the second DNA molecule share a region of sequence identity, comprising (a) chewing back the DNA molecules with an enzyme having an exonuclease activity, to yield single-stranded overhanging portions of each DNA molecule which contain a sufficient length of the region of sequence identity to hybridize specifically to each other; (b) specifically annealing the single-stranded overhangs; and (c) repairing single-stranded gaps in the annealed DNA molecules and sealing the nicks thus formed (ligating the nicked DNA molecules). The region of sequence identity generally comprises at least 20 non-palindromic nucleotides (nt), e.g., at least about 40 non-palindromic nt. In some embodiments of the invention, about 5% PEG is present during all steps of the reaction, and/or the repair reaction is achieved with Taq DNA polymerase and a compatible ligase, such as Taq DNA ligase. The method allows the joining of a number of DNA fragments, in a predetermined order and orientation, without the use of restriction enzymes. It can be used, e.g., to join synthetically produced sub-fragments of a gene or genome of interest.
    • 本发明涉及例如使用分离的蛋白质试剂连接两个目的双链(ds)DNA分子的体外方法,其中第一DNA分子的远端区域和第二DNA分子的近端区域 共享序列同一性区域,其包括(a)用具有核酸外切酶活性的酶咀嚼DNA分子,以产生每个DNA分子的单链突出部分,其含有足够长度的序列同一性区域以与 彼此; (b)具体退火单链突出端; 和(c)修复退火的DNA分子中的单链间隙并密封由此形成的切口(连接有缺口的DNA分子)。 序列同一性区域通常包含至少20个非回文序列核苷酸(nt),例如至少约40个非回文性核苷酸。 在本发明的一些实施方案中,在反应的所有步骤期间存在约5%的PEG,和/或用Taq DNA聚合酶和相容连接酶如Taq DNA连接酶实现修复反应。 该方法允许以预定的顺序和取向连接多个DNA片段,而不使用限制酶。 其可以用于例如合成产生的感兴趣的基因或基因组的亚片段。