The paper discusses the mechanisms of antibiotic resistance in Staphylococcus aureus, focusing on beta-lactam resistance through the blaZ and mecA genes, glycopeptide resistance via the vanA operon, and resistance to other antibiotics through various genes and mutations.

The study presents an optimized DNA extraction protocol for improving the identification of Staphylococcus aureus and its antibiotic resistance genes from infected tissue using nanopore sequencing. The modified protocol significantly reduced human DNA content, enhancing the sensitivity of metagenomic sequencing. Several antibiotic resistance genes, including arlS, sav1866, norA, mepA, and tetC, were identified in S. aureus isolates from patients with orthopedic implant-related infections.

Chalcone 4 was identified as an efflux pump inhibitor (EPI) targeting NorA and MepA efflux pumps in Staphylococcus aureus, enhancing the efficacy of Norfloxacin against strains overexpressing these pumps.

The study characterized methicillin-resistant Staphylococcus aureus (MRSA) isolates, identifying genes such as mecA, blaZ, norA, gyrA, gyrB, tet-38, mepA, mepR, arlS, arlR, mgrA, clsA, dfrC, msbA, rpoB32, mprF, and mrpA, which confer resistance to various antibiotics.

The study identified a novel genotype of methicillin-susceptible Staphylococcus aureus (HS-MSSA) that caused a fatal sepsis case. The strain carries a strain-specific blaZ-bearing plasmid, indicating resistance to penam antibiotics.

The study presents a DNA microarray-based assay for the simultaneous detection of 44 sepsis-relevant bacterial pathogens, 360 virulence factors, and 409 antibiotic resistance genes. The assay was evaluated with 14 multidrug-resistant strains, including all ESKAPE pathogens.

The essential oil of Piper caldense (EOPC) was found to potentiate the activity of Norfloxacin against Staphylococcus aureus strains overexpressing efflux pump genes norA, mepA, and qacC. EOPC inhibited the efflux pumps NorA, MepA, and QacC, thereby reducing the minimum inhibitory concentration (MIC) of Norfloxacin and Ethidium Bromide.

The study identified 18 antimicrobial resistance genes in Staphylococcus aureus strain DC.RB_015, including mecA, blaZ, mepA, tet(K), tet(38), arlR, arlS, norA, mgrA, LmrS, APH(3′)-IIIa, aad(6), ErmB, SAT-4, mecR1, GlpT, murA, and bacA, which confer resistance to various antibiotics such as methicillin, beta-lactam, tetracycline, fluoroquinolone, macrolide, aminoglycoside, nucleoside, fosfomycin, and bacitracin.

Mupirocin induces the expression of norA and mepA efflux pumps in Staphylococcus aureus, leading to increased tolerance to ciprofloxacin and chlorhexidine, respectively.

The study identified several AMR genes in methicillin-resistant staphylococci isolates from goats and their farm environments in Saudi Arabia, including mecA, blaZ, norA, lmrS, mepA, mepR, arlR, arlS, tet(38), mecR1, dfrC, fusC, fosB, fexA, tetM, msrA, mphC, fusB, APH(3′)-IIIa, tetK, and dfrG. These genes confer resistance to various antibiotics such as penicillins, fluoroquinolones, aminoglycosides, macrolides, phenicols, diaminopyrimidines, oxazolidinones, tetracyclines, and fosfomycin.

The study demonstrates that increased expression of the efflux pump norA drives the rapid evolutionary trajectory from tolerance to resistance against ciprofloxacin in Staphylococcus aureus. Mutations in topoisomerase IV ParC (GrlA) such as Ser80Phe and Glu84Lys were identified as key contributors to ciprofloxacin resistance.

The study identifies tetracycline resistance genes tet-38 and mepA/R in Staphylococcus aureus BIAI isolates, highlighting their limited acquired antibiotic resistance mechanisms.

The study identified 42 antimicrobial resistance genes (ARG) in Helicobacter pylori, including 16 related to single antibiotic class resistance and 26 related to multidrug resistance. Key genes include hp1181, copA, msbA, vanT, vanTr, mepA, and several RND efflux pumps. These genes were validated through multiple detection tools and curation processes.

The study identified multiple antibiotic resistance genes in Staphylococcus aureus isolates from raw shrimp in China, including mecA, mecR1, blaZ, aph(3')-IIIa, aad(6), ANT(4')-Ib, tet(K), mph(C), lnu(A), ermB, ermC, dfrC, dfrG, fosB, SAT-4, rpoB, msr(A), mepA, mepR, norA, mgrA, tet(38), sav1866, arlR, and arlS, which confer resistance to various antibiotics such as beta-lactams, aminoglycosides, tetracyclines, macrolides, lincosamides, streptogramins, trimethoprim, fosfomycin, and others.

The study identified 63 antibiotic resistance genes (ARGs) in Aeromonas hydrophila isolates from Sichuan, China, highlighting the presence of genes encoding beta-lactamases, aminoglycoside modifying enzymes, efflux pumps, and mobile genetic elements, indicating a high level of antibiotic resistance.

The study identified that the sesquiterpenes nerolidol, farnesol, and alpha-bisabolol inhibited efflux pumps NorA, Tet(K), MsrA, and MepA in Staphylococcus aureus strains, reducing the minimum inhibitory concentration (MIC) of antibiotics and enhancing their antibacterial activity.

The study identified various antimicrobial resistance (AMR) genes in bacterial positive blood cultures using nanopore sequencing, demonstrating the effectiveness of this method in detecting resistance mechanisms and pathogens quickly.

The study identified various antimicrobial resistance genes in Staphylococcus aureus isolates from Vermont dairy farms, including beta-lactam resistance genes (blaZ, blaI, blaR), tetracycline resistance genes (tet(K), tet(38)), erythromycin resistance genes (erm(T), erm(A)), lincomycin resistance gene (lnu(G)), aminoglycoside resistance genes (aaC3, ant(9)-la), multidrug resistance efflux pumps (lmrS, mepA, mepR, mepB, norA, norB, arlS, arlR, mgrA), and fosfomycin resistance gene (fosB).

The study identified multidrug-resistant Staphylococcus aureus isolates, including MRSA-ST80, carrying various AMR genes such as mecA, blaI, blaZ, ermC, aph-S-tph, dha1, norA, tet38, mepA, lmrS, and fosB. Mutations in gyrA and parC were associated with fluoroquinolone resistance.

Isoniazid (INA) potentiates tigecycline (TIG) to kill methicillin-resistant Staphylococcus aureus (MRSA) by enhancing intracellular accumulation of TIG through modulation of proton motive force and membrane integrity.

The study identified multiple AMR genes in multidrug-resistant S. aureus isolates from Bangladesh, including mecA, blaZ, ermC, mepA, norA, norC, sdrM, and lmrS, which confer resistance to various antibiotics.

The study identifies and characterizes several efflux pump genes (norA, mepA, bmrA, patA, and patB) in Gram-positive bacteria, demonstrating their role in mediating resistance to fluoroquinolones. A novel diagnostic molecule, 5a4, was developed to quantify efflux activity, showing promise for rapid and accurate detection of efflux-mediated resistance.

The study identifies mepA overexpression and reduced membrane potential as key mechanisms of ciprofloxacin heteroresistance in Staphylococcus aureus strain 529.

The paper discusses the synergistic pathogenesis of Acinetobacter baumannii and Staphylococcus aureus, focusing on biofilms, efflux pumps, and secretion systems. It identifies several AMR genes and mutations associated with resistance to various antibiotics.

The study identifies various antimicrobial resistance genes in Staphylococcus aureus isolates from patients with chronic rhinosinusitis, including blaI, blaZ, blaPC1, blaR1, erm(T), erm(A), tet(38), mepA, fosB, and ermC, which confer resistance to penicillin, macrolides, lincosamides, streptogramins, tetracycline, and fosfomycin.

AmrProfiler identifies a wide range of AMR genes and mutations across multiple bacterial species, demonstrating high accuracy and broader species coverage compared to existing tools.

The study identifies hub genes involved in antimicrobial resistance in Staphylococcus aureus, including mecA, fosB, arlR, mepA, mgrA, arlS, and msrA2, which are associated with mechanisms such as efflux pump regulation, target protection, and target replacement.

The study identifies mepA, LmrS, and norA as multidrug and quinolone resistance genes in a ciprofloxacin-resistant Staphylococcus aureus strain isolated from edible fish, demonstrating their role in promoting mucosal colonization under food-residue-level antibiotic exposure.