共查询到16条相似文献,搜索用时 212 毫秒
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DNA重组技术,即DNA克隆技术的研究和运用是现代生物学发展的一个重要分支,是分子生物学发展的突出领域。本文介绍了DNA重组的类型及相关的生物学概念;综述了目前已报道的传统的酶切-连接经典克隆方法、位点特异性重组克隆方法、以及同源重组克隆方法,重点阐述了各自的原理、步骤、特点及实际应用等方面;最后归纳总结了各种方法的优缺点和应用范围,并对该技术的科研成果进行了回顾和对未来的研究进行了展望。 相似文献
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通路克隆系统:DNA重组技术的新进展 总被引:7,自引:0,他引:7
近几年新发展了一种载体间DNA片段相互灵活转化的多功能系统 ,即通路克隆系统(gatewaycloningsystem)。它是一种位点特异的DNA重组技术 ,包括PCR产物的定向克隆 ,DNA片断高效、广泛的亚克隆 ,氨基或羧基末端的融合蛋白表达等。重点阐述了该系统的作用原理、特点及其应用。 相似文献
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基因组序列的功能分析以及代谢途径的构建改造等都需要克隆目的DNA。获得大片段DNA序列的方法有构建和筛选基因文库,PCR扩增,体外大片段DNA合成和组装等,但体内重组直接克隆的方法在操作、克隆长片段和应用等方面更具优势。介绍了Red/ET重组介导的大片段DNA体内直接克隆的主要方法及其应用。 相似文献
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DNA克隆和组装技术是重要的分子生物学工具。近年来,随着合成生物学的飞速发展,对大片段DNA元件的快速有效组装就显得尤为关键。同时,各种DNA克隆和组装技术也竞相发展起来。通过对基于非典型酶切连接、PCR、同源重组、单链退火拼接等原理发展起来的各种DNA克隆和组装技术进行综述,为合成生物学的进一步发展提供有效的操作工具。 相似文献
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DNA分子克隆是基本的分子生物学实验技术,传统的分子克隆方法大多需经过酶切链接过程,但在某些情况下,没有合适的酶切位点往往会成为阻碍克隆进行的障碍.本文描述了一种新的分子克隆方法,称为不依赖酶切和链接的分子克隆(RLIC).利用RLIC,将3种不同大小的DNA片段克隆到3种不同载体,证明了这种方法的有效性和可靠性.由于该方法不受限制性酶切序列限制,省去了酶切连接步骤,因此具有很大的灵活性和简便性,在分子生物学研究方面有广泛应用前景. 相似文献
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使用与Gateway技术兼容的T载体获得入门克隆 总被引:8,自引:0,他引:8
与Gateway技术兼容的农杆菌双元载体系统已开始应用于植物功能基因组的研究,但应用这些载体系统的一个瓶颈问题,是如何简单、经济和高效地将PCR产物或其他来源的目的DNA片段构建到入门载体上获得入门克隆.为此,将传统的TA克隆技术与Gateway重组克隆技术进行整合,构建了与Gateway技术兼容的两种TA克隆载体,用于在克隆PCR产物或其他来源的目的DNA片段的同时获得入门克隆.利用兼容Gateway技术的TA克隆载体有效地解决了上述瓶颈问题. 相似文献
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Katrin Messerschmidt Lena Hochrein Daniel Dehm Karina Schulz Bernd Mueller-Roeber 《Analytical biochemistry》2016
Synthetic biology aims at designing and engineering organisms. The engineering process typically requires the establishment of suitable DNA constructs generated through fusion of multiple protein coding and regulatory sequences. Conventional cloning techniques, including those involving restriction enzymes and ligases, are often of limited scope, in particular when many DNA fragments must be joined or scar-free fusions are mandatory. Overlap-based-cloning methods have the potential to overcome such limitations. One such method uses seamless ligation cloning extract (SLiCE) prepared from Escherichia coli cells for straightforward and efficient in vitro fusion of DNA fragments. Here, we systematically characterized extracts prepared from the unmodified E. coli strain DH10B for SLiCE-mediated cloning and determined DNA sequence-associated parameters that affect cloning efficiency. Our data revealed the virtual absence of length restrictions for vector backbone (up to 13.5 kbp) and insert (90 bp to 1.6 kbp). Furthermore, differences in GC content in homology regions are easily tolerated and the deletion of unwanted vector sequences concomitant with targeted fragment insertion is straightforward. Thus, SLiCE represents a highly versatile DNA fusion method suitable for cloning projects in virtually all molecular and synthetic biology projects. 相似文献
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随着合成生物学的兴起和发展,基因克隆和DNA大片段组装成为了常规操作。利用人工智能和液体操作机器人进行高通量的DNA组装和功能筛选已被广泛应用。传统的依赖于限制性内切酶识别位点的克隆技术对序列有选择性、步骤繁琐、实验人员的培训周期长,不利于以流水线形式进行工程化使用,已经逐步在生物工程领域内被淘汰。文中论述了一系列适于机械化操作的新一代分子克隆技术,即不依赖基因序列和连接反应克隆方法、Gibson组装、聚合酶环形延伸克隆、细胞裂解物体外无痕连接和细胞体内组装克隆。对这些方法的建立、基本原理及应用前景等方面进行了总结,并对其优缺点进行了比较。 相似文献
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Site-directed mutagenesis and polymerase chain reaction (PCR)-based cloning are well-established methods carried out routinely in most modern molecular biology laboratories. Application of these methods requires confirmation of the DNA sequence of the target gene by sequencing of DNA purified from multiple colonies, a laborious process. We have developed an alternative approach to screen DNA amplified directly from colony DNA for both desired and undesired mutations. This approach is based on the use of a plant mismatch DNA endonuclease, Surveyor Nuclease, to directly screen clones derived by site-directed mutagenesis. We have also used this approach to identify error-free clones of three genes from celery cDNA produced by PCR and TOPO cloning. Sequence confirmation using Surveyor Nuclease provides a fast and simple approach to obtain desired clones from site-directed mutagenesis and PCR-based cloning methods without the necessity of sequencing DNAs purified from multiple clones. 相似文献
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The seamless ligation cloning extract (SLiCE) method is a novel seamless DNA cloning tool that utilizes homologous recombination activities in Escherichia coli cell lysates to assemble DNA fragments into a vector. Several laboratory E. coli strains can be used as a source for the SLiCE extract; therefore, the SLiCE-method is highly cost-effective.The SLiCE has sufficient cloning ability to support conventional DNA cloning, and can simultaneously incorporate two unpurified DNA fragments into vector. Recently, many seamless DNA cloning kits have become commercially available; these are generally very convenient, but expensive. In this study, we evaluated the cloning efficiencies between a simple and highly cost-effective SLiCE-method and a commercial kit under various molar ratios of insert DNA fragments to vector DNA. This assessment identified that the SLiCE from a laboratory E. coli strain yielded 30?85% of the colony formation rate of a commercially available seamless DNA cloning kit. The cloning efficiencies of both methods were highly effective, exhibiting over 80% success rate under all conditions examined. These results suggest that SLiCE from a laboratory E. coli strain can efficiently function as an effective alternative to commercially available seamless DNA cloning kits. 相似文献
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Eiji Kobayashi Hiroyuki KishiMasae Horii Hiroshi HamanaTerumi Nagai Atsushi Muraguchi 《Biochemical and biophysical research communications》2014
Homologous recombination technologies enable high-throughput cloning and the seamless insertion of any DNA fragment into expression vectors. Additionally, retroviral vectors offer a fast and efficient method for transducing and expressing genes in mammalian cells, including lymphocytes. However, homologous recombination cannot be used to insert DNA fragments into retroviral vectors; retroviral vectors contain two homologous regions, the 5′- and 3′-long terminal repeats, between which homologous recombination occurs preferentially. In this study, we have modified a retroviral vector to enable the cloning of DNA fragments through homologous recombination. To this end, we inserted a bacterial selection marker in a region adjacent to the gene insertion site. We used the modified retroviral vector and homologous recombination to clone T-cell receptors (TCRs) from single Epstein Barr virus-specific human T cells in a high-throughput and comprehensive manner and to efficiently evaluate their function by transducing the TCRs into a murine T-cell line through retroviral infection. In conclusion, the modified retroviral vectors, in combination with the homologous recombination method, are powerful tools for the high-throughput cloning of cDNAs and their efficient functional analysis. 相似文献