Primase-based whole genome amplification.

Primase-based whole genome amplification.
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DOI:
10.1093/nar/gkn377
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发表时间:
2008-08
影响因子:
14.9
通讯作者:
Kong H
Kong H
中科院分区:
生物学2区
文献类型:
--
作者:
Li Y;Kim HJ;Zheng C;Chow WH;Lim J;Keenan B;Pan X;Lemieux B;Kong H

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体外DNA扩增方法,如聚合酶链式反应(PCR),依赖于合成的寡核苷酸引物来启动反应。在体内,通过DNA引发酶在模板上合成引物。噬菌体T7基因4蛋白(gp4)具有引发酶和解旋酶活性。在这项研究中,我们报告了一种基于引物酶的全基因组扩增(pWGA)方法的发展,该方法利用gp4引物酶合成引物,消除了添加合成引物的要求。从1 ng至10 ng人基因组DNA输入的pWGA的典型产率在微克范围内,在37°C下孵育1小时后达到超过一千倍的扩增。不同染色体上的20个位点对人类基因组DNA的扩增偏倚为6.3倍。除了扩增总基因组DNA之外,当与荧光报告染料组合时,pWGA还可用于检测和定量样品中的污染物DNA。当环状DNA用作pWGA中的模板时,从低至100个拷贝的输入观察到108倍的扩增。pWGA在扩增环状DNA中的高效率使其成为诊断和分型环状人DNA病毒如人乳头瘤病毒(HPV)的潜在工具。
In vitro DNA amplification methods, such as polymerase chain reaction (PCR), rely on synthetic oligonucleotide primers for initiation of the reaction. In vivo, primers are synthesized on-template by DNA primase. The bacteriophage T7 gene 4 protein (gp4) has both primase and helicase activities. In this study, we report the development of a primase-based Whole Genome Amplification (pWGA) method, which utilizes gp4 primase to synthesize primers, eliminating the requirement of adding synthetic primers. Typical yield of pWGA from 1 ng to 10 ng of human genomic DNA input is in the microgram range, reaching over a thousand-fold amplification after 1 h of incubation at 37°C. The amplification bias on human genomic DNA is 6.3-fold among 20 loci on different chromosomes. In addition to amplifying total genomic DNA, pWGA can also be used for detection and quantification of contaminant DNA in a sample when combined with a fluorescent reporter dye. When circular DNA is used as template in pWGA, 108-fold of amplification is observed from as low as 100 copies of input. The high efficiency of pWGA in amplifying circular DNA makes it a potential tool in diagnosis and genotyping of circular human DNA viruses such as human papillomavirus (HPV).
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期刊: GENOME RESEARCH
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影响因子: 11.1
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