Metagenomic strategies identify diverse integron-integrase and antibiotic resistance genes in the Antarctic environment

• Published in: MicrobiologyOpen
• Main Authors: Antelo, Verónica, Giménez, Matías, Azziz, Gastón, Valdespino Castillo, Patricia, Falcón, Luisa I., Ruberto, Lucas Adolfo Mauro, MacCormack, Walter P., Mazel, Didier, Batista, Silvia
• Format: Article in Journal/Newspaper
• Language: English
• Published: John Wiley & Sons Inc.
• Subjects: ANTIBIOTIC RESISTANCE; BIOINFORMATICS; HORIZONTAL GENE TRANSFER; MICROBIAL GENOMICS; https://purl.org/becyt/ford/1.6; https://purl.org/becyt/ford/1; Antarctic; The Antarctic; Argentino; Argentina; Uruguay; Luisa; Falcón; Antarc*; Antarctica; Dirección Nacional del Antártico; Instituto Antártico Argentino
• Online Access: http://hdl.handle.net/11336/170722

The objective of this study is to identify and analyze integrons and antibiotic resistance genes (ARGs) in samples collected from diverse sites in terrestrial Antarctica. Integrons were studied using two independent methods. One involved the construction and analysis of intI gene amplicon libraries. In addition, we sequenced 17 metagenomes of microbial mats and soil by high-throughput sequencing and analyzed these data using the IntegronFinder program. As expected, the metagenomic analysis allowed for the identification of novel predicted intI integrases and gene cassettes (GCs), which mostly encode unknown functions. However, some intI genes are similar to sequences previously identified by amplicon library analysis in soil samples collected from non-Antarctic sites. ARGs were analyzed in the metagenomes using ABRIcate with CARD database and verified if these genes could be classified as GCs by IntegronFinder. We identified 53 ARGs in 15 metagenomes, but only four were classified as GCs, one in MTG12 metagenome (Continental Antarctica), encoding an aminoglycoside-modifying enzyme (AAC(6´)acetyltransferase) and the other three in CS1 metagenome (Maritime Antarctica). One of these genes encodes a class D β-lactamase (blaOXA-205) and the other two are located in the same contig. One is part of a gene encoding the first 76 amino acids of aminoglycoside adenyltransferase (aadA6), and the other is a qacG2 gene. Fil: Antelo, Verónica. Instituto de Investigaciones Biológicas "Clemente Estable"; Uruguay Fil: Giménez, Matías. Instituto de Investigaciones Biológicas "Clemente Estable"; Uruguay Fil: Azziz, Gastón. Universidad de la Republica. Facultad de Agricultura; Uruguay Fil: Valdespino Castillo, Patricia. Lawrence Berkeley National Laboratory; Estados Unidos Fil: Falcón, Luisa I. Universidad Nacional Autónoma de México; México Fil: Ruberto, Lucas Adolfo Mauro. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo ...