Global dissemination of the beta-lactam resistance gene blaTEM-1 among pathogenic bacteria

Antibiotic resistance presents a burgeoning global health crisis, with over 70 % of pathogenic bacteria now exhibiting resistance to at least one antibiotic. This study leverages a vast dataset of 618,853 pathogenic bacterial genomes from the NCBI pathogen detection database, offering comprehensive insights into antibiotic resistance patterns, species-specific profiles, and transmission dynamics of resistant pathogens. We centered our investigation on the beta-lactam resistance gene blaTEM-1, found in 43,339 genomes, revealing its extensive distribution across diverse species and isolation sources. The study unveiled the prevalence of 15 prominent antibiotic resistance genes (ARGs), including those conferring resistance to beta-lactam, aminoglycoside, and tetracycline antibiotics. Distinct resistance patterns were observed between Gram-positive and Gram-negative bacteria, indicating the influence of phylogeny on resistance dissemination. Notably, the blaTEM-1 gene demonstrated substantial prevalence across a wide array of bacterial species (8) and a high number of isolation sources (11). Genetic context analysis revealed associations between blaTEM-1 and mobile genetic elements (MGEs) like transposons and insertion sequences. Additionally, we observed recent horizontal transfer events involving clusters of blaTEM-1 genes and MGEs underscore the potential of MGEs in facilitating the mobilization of ARGs. Our findings underscore the importance of adopting a One Health approach to global genomic pathogen surveillance, aiming to uncover the transmission routes of ARGs and formulate strategies to address the escalating antibiotic resistance crisis.