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Science 6 July 1990:
Vol. 249. no. 4964, pp. 73 - 75
DOI: 10.1126/science.2195655
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Articles

Science, Vol 249, Issue 4964, 73-75
Copyright © 1990 by American Association for the Advancement of Science

articles

Site-specific cleavage of a yeast chromosome by oligonucleotide-directed triple-helix formation

SA Strobel and PB Dervan

Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125.

Oligonucleotides equipped with EDTA-Fe can bind specifically to duplex DNA by triple-helix formation and produce double-strand cleavage at binding sites greater than 12 base pairs in size. To demonstrate that oligonucleotide-directed triple-helix formation is a viable chemical approach for the site-specific cleavage of large genomic DNA, an oligonucleotide with EDTA-Fe at the 5' and 3' ends was targeted to a 20-base pair sequence in the 340-kilobase pair chromosome III of Saccharomyces cerevisiae. Double-strand cleavage products of the correct size and location were observed, indicating that the oligonucleotide bound and cleaved the target site among almost 14 megabase pairs of DNA. Because oligonucleotide-directed triple-helix formation has the potential to be a general solution for DNA recognition, this result has implications for physical mapping of chromosomes.


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