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• W3197151497 abstract "Integrons are bacterial genetic elements that can integrate mobile gene cassettes. They are mostly known for spreading antibiotic resistance cassettes among human pathogens. However, beyond clinical settings, gene cassettes encode an extraordinarily diverse range of functions important for bacterial adaptation. The recovery and sequencing of cassettes has promising applications, including: surveillance of clinically important genes, particularly antibiotic resistance determinants; investigating the functional diversity of integron-carrying bacteria; and novel enzyme discovery. Although gene cassettes can be directly recovered using PCR, there are no standardised methods for their amplification and, importantly, for validating sequences as genuine integron gene cassettes. Here, we present reproducible methods for the PCR amplification, sequence processing, and validation of gene cassette amplicons from complex communities. We describe two different PCR assays that either amplify cassettes together with integron integrases, or gene cassettes together within cassette arrays. We compare the use of Nanopore and Illumina sequencing, and present bioinformatic pipelines that filter sequences to ensure that they represent amplicons from genuine integrons. Using a diverse set of environmental DNAs, we show that our approach can consistently recover thousands of unique cassettes per sample and up to hundreds of different integron integrases. Recovered cassettes confer a wide range of functions, including antibiotic resistance, with as many as 300 resistance cassettes found in a single sample. In particular, we show that class 1 integrons appear to be collecting and concentrating antibiotic resistance genes out of the broader diversity of cassette functions. The methods described here can be applied to any environmental or clinical microbiome sample." @default.
• W3197151497 created "2021-09-13" @default.
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• W3197151497 date "2021-09-08" @default.
• W3197151497 modified "2023-10-15" @default.
• W3197151497 title "Methods for the targeted sequencing and analysis of integrons and their gene cassettes from complex microbial communities" @default.
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• W3197151497 doi "https://doi.org/10.1101/2021.09.08.459516" @default.
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