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Effect of GC Content on Target Hook Required for Gene Isolation by Transformation-Associated Recombination Cloning  

김중현 (동아대학교 자연과학대학 생물학과)
신영선 (동아대학교 자연과학대학 생물학과)
윤영호 (동아대학교 자연과학대학 생물학과)
장형진 (동아대학교 자연과학대학 생물학과)
김은아 (동아대학교 자연과학대학 생물학과)
김광섭 (동아대학교 자연과학대학 생물학과)
정정남 (동아대학교 자연과학대학 생물학과)
박인호 (동아대학교 자연과학대학 생물학과)
임선희 (동아대학교 자연과학대학 생물학과)
Publication Information
Korean Journal of Microbiology / v.39, no.3, 2003 , pp. 128-134 More about this Journal
Abstract
Transformation-associated recombination (TAR) cloning is based on co-penetration into yeast spheroplasts of genomic DNA along with TAR vector DNA that contains 5'- and 3'-sequences (hooks) specific for a gene of interest, followed by recombination between the vector and the human genomic DNA to establish a circular YAC. Typically, the frequency of recombinant insert capture is 0.01-1% for single-copy genes by TAR cloning. To further refine the TAR cloning technology, we determined the effect of GC content on target hooks required for gene isolation utilizing the $Tg\cdot\AC$ mouse transgene as the targeted region. For this purpose, a set of vectors containing a B1 repeated hook and Tg AC-specific hooks of variable GC content (from 18 to 45%) was constructed and checked for efficiency of transgene isolation by radial TAR cloning. Efficiency of cloning decreased approximately 2-fold when the TAR vector contained a hook with a GC content ~${\leq}23$% versus ~40%. Thus, the optimal GC content of hook sequences required for gene isolation by TAR is approximately 40%. We also analyzed how the distribution of high GC content (65%) within the hook affects gene capture, but no dramatic differences for gene capturing were observed.
Keywords
Saccaromyces cerevisiae; Transformation-associated recombination (TAR) cloning; Yeast Artificial Chromosome (YAC);
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