dfrA9

Accession ARO:3004548
Synonym(s)dfr9 dfrIX
DefinitionA dihydrofolate reductase and trimethoprim resistance gene identified from porcine isolates of Esherichia coli
AMR Gene Familytrimethoprim resistant dihydrofolate reductase dfr
Drug Classdiaminopyrimidine antibiotic
Resistance Mechanismantibiotic target replacement
Classification10 ontology terms | Show
Parent Term(s)1 ontology terms | Show
Publications

Jansson C and Skold O. 1991. Antimicrob Agents Chemother 35(9): 1891-1899. Appearance of a new trimethoprim resistance gene, dhfrIX, in Escherichia coli from swine. (PMID 1659308)

Resistomes

Prevalence of dfrA9 among the sequenced genomes, plasmids, and whole-genome shotgun assemblies available at NCBI for 82 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

SpeciesNCBI ChromosomeNCBI PlasmidNCBI WGS
No prevalence data


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|CAA40897.1|+|dfrA9 [Escherichia coli]
MASLNMIVAVNKTGGIGFENQIPWHEPEDLKHFKAVTMNSVLIMGRKTFASLPKVLPGRLHVVVSKTVPPTQNTDQVVYVSTYQIAVRTA
SLLVDKPEYSQIFVIGGKSAYENLAAYVDKLYLTRVQLNTQQDTELDLSLFKSWKLVSEVPTITENKTKLIFQIWINPNPISEEPTC


>gb|X57730.1|+|726-1259|dfrA9 [Escherichia coli]
ATGGCTTCTCTAAACATGATTGTCGCTGTCAATAAGACAGGAGGTATCGGATTTGAAAATCAGATTCCGTGGCATGAACCAGAAGATTTA
AAACACTTCAAAGCTGTTACAATGAACTCAGTTTTGATTATGGGTAGAAAAACTTTTGCCTCACTGCCTAAAGTGCTGCCCGGACGACTT
CATGTGGTAGTCAGTAAAACAGTACCACCCACCCAGAACACTGATCAAGTTGTGTATGTAAGTACATACCAGATCGCAGTAAGAACTGCA
AGCTTGTTGGTTGACAAACCAGAGTATTCTCAAATTTTTGTAATTGGTGGGAAGAGTGCGTACGAGAACTTAGCTGCCTACGTGGACAAA
CTCTACTTAACTAGAGTACAGCTCAACACACAACAAGACACTGAACTGGATTTATCCCTATTCAAGTCATGGAAACTCGTATCTGAGGTC
CCGACCATTACTGAAAACAAAACAAAACTTATTTTCCAAATTTGGATTAACCCTAACCCTATTAGTGAGGAACCCACATGTTAG