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. 1990 Mar;87(5):1889–1893. doi: 10.1073/pnas.87.5.1889

Genomic subtraction for cloning DNA corresponding to deletion mutations.

D Straus 1, F M Ausubel 1
PMCID: PMC53589  PMID: 2408039

Abstract

We have developed a technique, called genomic subtraction, for isolating the DNA that is absent in deletion mutants. The method removes from wild-type DNA the sequences that are present in both the wild-type and the deletion mutant genomes. The DNA that corresponds to the deleted region remains. Enrichment for the deleted sequences is achieved by allowing a mixture of denatured wild-type and biotinylated mutant DNA to reassociate. After reassociation, the biotinylated sequences are removed by binding to avidin-coated beads. This subtraction process is then repeated several times. In each cycle we hybridize the unbound wild-type DNA from the previous round with fresh biotinylated deletion mutant DNA. The unbound DNA from the final cycle is ligated to adaptors and amplified by using one strand of the adaptor as a primer in the polymerase chain reaction. The amplified sequences can then be used to probe a genomic library. We applied genomic subtraction to a yeast strain that has a 5-kilobase deletion, corresponding to 1/4000th of the genome. In the experiment reported here, three rounds of subtraction were sufficient to accurately identify genomic clones containing sequences that are missing in the deletion mutant. We discuss the limitations and some potential applications of the method.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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