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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Yeast DNA topoisomerase II is encoded by a single-copy, essential gene.

The gene TOP2 encoding yeast topoisomerase II has been cloned by immunological screening of a yeast genomic library constructed in the phage lambda expression vector, lambda gt11. The ends of the message encoded by the cloned DNA fragment were delimited by the Berk and Sharp procedure (S1 nuclease mapping) for the 5' end and mapping of the polyA tail portion of a cDNA fragment for the 3' end. The predicted size of the message agrees with the length of the message as determined by Northern blot hybridization analysis. The identity of the gene was confirmed by expressing the gene in E. coli from the E. coli promoter lac UV5 to give catalytically active yeast DNA topoisomerase II. Disruption of one copy of the gene in a diploid yeast creates a recessive lethal mutation, indicating that the single DNA topoisomerase II gene of yeast has an essential function.[1]


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