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- W1982296960 abstract "We constructed a series of cosmid vectors that carry the two cohesive end sites (cos) of lambda phage, arrayed in tandem, which enabled us to clone fragments of genomic DNA of up to 50 kb without a vector background. An equimolar mixture of the left and right vector arms of equal length was prepared from the vector DNA, simply by treating the DNA sequentially with three enzymes, restriction enzyme PvuII, alkaline phosphatase, and restriction enzyme BamHI (or BglII), without purification by agarose gel electrophoresis. After phenol extraction and ethanol precipitation, the equimolar mixture of the vector arms, which carried a single cos oriented from left to right, was directly ligated with insert DNA without further manipulation. We established conditions for cosmid cloning, using two kinds of DNA fragment of 40-50 kb, prepared from mouse L cell genomic DNA, as insert DNAs, namely, three cloned BamHI fragments and Sau3AI fragments, size-selected on a sucrose density gradient. The most important parameters affecting the cloning efficiency were the quality of the insert DNA and the molar ratio of the insert and vector arms. We achieved cloning efficiencies of 3.6 X 10(6)-1.3 X 10(7) colony forming units (cfu)/micrograms of insert DNA and 1.7 X 10(5)-1.0 X 10(6) cfu/micrograms of insert DNA, using the cloned BamHI fragments and the Sau3AI fragments, respectively. We examined more than 5000 clones and found that they all contained insert DNA." @default.
- W1982296960 created "2016-06-24" @default.
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- W1982296960 date "1989-01-01" @default.
- W1982296960 modified "2023-10-18" @default.
- W1982296960 title "Efficient simplified cosmid cloning: Construction and characterization of cosmid vectors that carry the two cohesive end sites of λ phages arrayed in tandem" @default.
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- W1982296960 doi "https://doi.org/10.1016/0003-2697(89)90281-9" @default.
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