Journal: Antimicrobial Agents and Chemotherapy
Article Title: Gtr9 mutation trades phage resistance for carbapenem sensitivity to potentiate phage-meropenem therapy against carbapenem-resistant Acinetobacter baumannii in vitro
doi: 10.1128/aac.01355-25
Figure Lengend Snippet: Identification of phage-resistant bacteria: the spot test ( A ) and phage amplification-TaqMan qPCR assay ( B ). Note: Control (phage pB23 alone). W (wild-type host bacteria B.m#2023). R/R 1 /R 2 (phage-resistant bacteria). Δ gtr9 (gene knockout of gtr9 ). Δ gtr9::gtr9 ( gtr9 -complemented strain). Representative results of the spot test showing the presence or absence of a lytic zone after dripping 5 µL of phage suspension (10⁸ PFU/mL) onto a lawn of B.m#2023 and incubating at 37°C for 12 h. The phage amplification-qPCR assay was performed by mixing equal volumes of bacterial and phage solutions (~10⁷ CFU/mL/PFU/mL), incubating at 37°C (180 rpm, 10 min), and collecting the supernatant via centrifugation (4°C, 12,000 rpm, 5 min) as the qPCR template. Error bars represent SD of three independent experiments (*, P -value <0.05).
Article Snippet: Whole-genome sequences of three phage-resistant mutants (R, R 1 , R 2 ) and wild host bacteria B.m#2023 were mapped to the reference genome ATCC 19606 ( GCA_009035845.1 ), respectively.
Techniques: Bacteria, Spot Test, Amplification, Control, Gene Knockout, Suspension, Centrifugation