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Identifying transposon insertions in bacterial genomes through nanopore sequencing


Transposon mutagenesis is a widely used tool for carrying out forward genetic screens across systems, but in some cases it can be difficult to identify transposon insertion points after successful phenotypic screens. As an alternative to traditional methods, we report on the efficacy of using an Oxford Nanopore MinION to identify transposon insertions through whole genome sequencing. We also report experiments using CRISPR-Cas to selectively target regions of the genome where a transposon has integrated. Our experiments provide a framework for understanding the efficiency of such techniques for carrying out forward genetic screens and point towards the ability to use CRISPR-based sequence capture to identify the insertion of particular regions of DNA across all genomes, which may enable Tn-Seq experiments using Nanopore based sequencing.

Authors: David A Baltrus, Meara Clark, John Medlen

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