Full-Assembly Genome Screening Detects More Antibiotic-Resistance Genes Than Chromosome-Only Methods
A study comparing genome screening methods found that analyzing complete bacterial genomes (including plasmids) detected 35 additional antibiotic-resistance genes missed by chromosome-only approaches. The research screened 25 probiotic-associated and 25 pathogen reference genomes using comprehensive bioinformatic tools. The findings suggest current safety assessments of probiotic bacteria may underestimate mobile antibiotic-resistance cargo, though high-risk genes were concentrated in pathogen genomes rather than probiotics.
Researchers conducted a systematic comparison of genome screening methodologies to assess how well current approaches detect mobile antibiotic-resistance genes (ARGs) in bacterial genomes. Using 50 reference genomes—25 from probiotic-associated strains and 25 from pathogens—they screened with full-assembly data versus chromosome-only data using standardized bioinformatic tools including CARD, PlasmidFinder, and ISfinder. Full-assembly screening identified 373 ARG loci compared to 338 in chromosome-only mode, with high-risk mobile-context calls increasing from 4 to 15 and recovering 32 plasmid replicons that chromosome-only methods completely missed. Notably, all 15 high-risk mobile-context loci occurred exclusively in pathogen/comparator genomes, while probiotic-associated strains showed significantly lower overall ARG burden (mean 0.52 versus 12.32 loci). The study emphasizes this represents an in silico safety signal at the reference-genome level rather than evidence about actual commercial probiotic products or genetic transfer risk.
What's missing
The study's own limitations include: (1) analysis limited to 50 reference genomes, which may not represent the full diversity of probiotic or pathogenic strains; (2) in silico predictions of mobile-context risk that require experimental validation to confirm actual transferability; (3) no assessment of whether detected ARGs confer clinically relevant resistance or whether plasmid-borne genes are actually mobilizable in vivo; (4) unclear generalizability to non-reference strains or emerging probiotic formulations.
What different sources said
- bioRxivCenter
Full-assembly screening reveals mobile antibiotic-resistance cargo missed by chromosome-only genomes
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