Accession ARO:3004550
DefinitionA dihydrofolate reductase and trimethoprim resistance gene from non-O1, non-O139 Vibrio cholerae
AMR Gene Familytrimethoprim resistant dihydrofolate reductase dfr
Drug Classdiaminopyrimidine antibiotic
Resistance Mechanismantibiotic target replacement
ResistomesCitrobacter freundiiwgs, Enterobacter asburiaewgs, Enterobacter cloacaewgs, Enterobacter hormaecheip+wgs, Escherichia colig+p+wgs, Klebsiella aerogeneswgs, Klebsiella oxytocawgs, Klebsiella pneumoniaep+wgs, Raoultella planticolawgs, Salmonella entericawgs, Serratia marcescenswgs, Vibrio choleraep
Classification10 ontology terms | Show
Parent Term(s)1 ontology terms | Show

Wu J, et al. 2015. Antimicrob. Agents Chemother. 59(7):4293-5 Molecular characterization of ISCR1-mediated blaPER-1 in a non-O1, non-O139 Vibrio cholerae strain from China. (PMID 25870070)


Prevalence of dfrA27 among the sequenced genomes, plasmids, and whole-genome shotgun assemblies available at NCBI for 85 important pathogens (see methodological details and complete list of analyzed pathogens). Values reflect percentage of genomes, plasmids, or whole-genome shotgun assemblies that have at least one hit to the AMR detection model. Default view includes percentages calculated based on Perfect plus Strict RGI hits. Select the checkbox to view percentages based on only Perfect matches to AMR reference sequences curated in CARD (note: this excludes resistance via mutation as references in protein variant models are often wild-type, sensitive sequences).

Prevalence: protein homolog model (view sequences)

SpeciesNCBI ChromosomeNCBI PlasmidNCBI WGS
Citrobacter freundii0%2.33%2.33%
Enterobacter asburiae0%0%1.56%
Enterobacter cloacae0%0%0.23%
Enterobacter hormaechei0%2.7%3.01%
Escherichia coli0.04%0.14%0.39%
Klebsiella aerogenes0%0%0.6%
Klebsiella oxytoca0%0%0.93%
Klebsiella pneumoniae0%0.38%4.22%
Raoultella planticola0%0%5.26%
Salmonella enterica0%0%0.04%
Serratia marcescens0%0%0.23%
Vibrio cholerae0%20%0%
Show Perfect Only

Detection Models

Model Type: protein homolog model

Model Definition: The protein homolog model is an AMR detection model. Protein homolog models detect a protein sequence based on its similarity to a curated reference sequence. A protein homolog model has only one parameter: a curated BLASTP bitscore cutoff for determining the strength of a match. Protein homolog model matches to reference sequences are categorized on three criteria: perfect, strict and loose. A perfect match is 100% identical to the reference sequence along its entire length; a strict match is not identical but the bitscore of the matched sequence is greater than the curated BLASTP bitscore cutoff. Loose matches are other sequences with a match bitscore less than the curated BLASTP bitscore.

Bit-score Cut-off (blastP): 300

>gb|ACD45689.1|+|dfrA27 [Vibrio cholerae non-O1/non-O139]

>gb|KP076293.1|+|2348-2821|dfrA27 [Vibrio cholerae non-O1/non-O139]