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Mutant hunts using comprehensive sequence-defined libraries make it possible to identify virtually all of the nonessential functions required for different bacterial processes. However, the success of such screening depends on the accuracy of mutant identification in the mutant library used. To provide a high-quality library forPseudomonas aeruginosa PAO1, we created a sequence-verified collection of 9,437 transposon mutants that provides genome coverage and includes two mutants for most genes. Mutants were cherry-picked from a larger library, colony-purified, and resequenced both individually using Sanger sequencing and in a pool using Tn-seq. About 8% of the insertion assignments were corrected, and in the final library nearly 93% of the transposon locations were confirmed by at least one of the resequencing procedures. The extensive sequence verification and inclusion of more than one mutant for most genes should help minimize missed or erroneous genotype-phenotype assignments in studies using the new library.

Sequence-Verified Two-Allele Transposon Mutant Library for Pseudomonas aeruginosa PAO1