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. 1990 Dec 25;18(24):7349–7355. doi: 10.1093/nar/18.24.7349

Site-directed, recombination-mediated mutagenesis of a complex gene locus.

M C Barton 1, M F Hoekstra 1, B M Emerson 1
PMCID: PMC332872  PMID: 2175433

Abstract

We have generated a site-specific 17 bp insertion within a 38 kb chick globin gene cluster by employing the recombination abilities of Saccharomyces cerevisiae. This gene cluster contains four beta-type globin genes which share a high degree of sequence homology. In this procedure, a small fragment of beta A-globin DNA containing a 17 bp insertion is subcloned into a URA3-based yeast integrating vector (YIp). This mutated globin subclone is introduced into cells that carry the 38 kb globin cluster clone on a single-copy, circular vector derived from a yeast artificial chromosome (YAC). Insertion of the 17 bp oligomer is achieved by targeted integration of the Ylp subclone. The recombinant contains the normal beta A-globin gene, the mutant gene and Ylp vector sequences between the two copies. Excision of the vector sequences and one copy of the duplicated globin sequences by homologous recombination is required for cell survival when exposed to the selective agent 5-fluoroorotic acid, which is toxic to ura+ yeast cells. Depending upon the point of the cross-over, a ura- yeast cell bearing either a wild-type globin gene or a 17 bp insertion mutation will result. By restriction mapping and in vitro transcription analysis, the beta A-globin gene containing the 17 bp insert has no nonspecific mutations generated during the recombination and selection procedures. Specific mutations of regulatory regions, including protein-DNA binding sites, can be accurately targeted within extensive DNA clones by this method.

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