Antibiotic resistance is evolving faster than many treatment pipelines can keep up with, largely because bacteria can acquire survival traits under drug pressure in surprisingly short timescales. New work from Technion now identifies a rapid genetic route that helps bacteria amplify resistance genes far more quickly than previously documented mechanisms.
Led by Idan Yelin and Roy Kishony, the team reports in Nature Microbiology that bacteria can “inflate” the copy number of specific genes that confer an advantage during antibiotic exposure. The study focuses on how those amplifications arise and how reliably they can be triggered by selection from antibiotics.
A key advance is AmpliFinder, a computational tool designed to scan over 10,000 laboratory-evolved bacterial samples. Using it, the researchers uncovered forms of gene amplification that are structurally unusual and therefore difficult to detect with standard expectations of textbook-like duplication patterns.
Classic amplification often involves repetitive gene segments flanked by mobile genetic elements. In contrast, the new results highlight non-canonical amplifications in which mobile genetic elements are missing from one or both ends of the repeat structure. These “incomplete” repeats were not rare anomalies; they were common and, crucially, more efficient at generating extra gene copies.
Mechanistically, the process can connect distant genomic regions through a single DNA segment, producing targeted duplications of resistance-linked DNA. The outcome is rapid production of many copies of genes that help cells withstand antibiotics, enabling adaptation on a compressed evolutionary timeline.
The effect is demonstrated in two bacterial species: Escherichia coli and Acinetobacter baumannii. When exposed to chloramphenicol, bacteria carrying amplified DNA segments containing the mdfA gene not only showed increased baseline resistance but also adapted to progressively higher antibiotic concentrations.
This accelerated evolution suggests a practical explanation for how resistance can emerge quickly during real-world treatment courses. The findings also imply that surveillance strategies may underestimate the prevalence of amplification events because non-canonical structures evade conventional detection methods.
By mapping these hidden amplification routes, the study points toward therapeutic opportunities. If the cellular steps enabling rapid amplification can be disrupted, clinicians could potentially slow resistance development and preserve antibiotic effectiveness.
Subject of Research: Cells
Article Title: Non-canonical gene amplifications facilitate adaptive evolution in bacteria
News Publication Date: 6-Jul-2026
Web References: https://doi.org/10.1038/s41564-026-02415-2
References: 10.1038/s41564-026-02415-2
Image Credits: Not provided
Keywords: antibiotic resistance; gene amplification; non-canonical duplications; computational biology; AmpliFinder; E. coli; Acinetobacter baumannii; chloramphenicol; genomics; public health
Tags: accelerated spread of antibiotic resistanceAmpliFinder computational toolAntibiotic resistance gene amplificationbacterial evolution under drug pressurebacterial genome structural variationsgene copy number increasegenetic mechanisms of antibiotic resistancemobile genetic elements in resistancenon-canonical gene duplicationrapid bacterial adaptationstructural diversity of resistance genestreatment failure due to resistance
