Genetic Carriers and Genomic Distribution of cadA6-A Novel Variant of a Cadmium Resistance Determinant Identified in Listeria spp.

International Journal of Molecular Sciences
Cora ChmielowskaDariusz Bartosik

Abstract

Listeria monocytogenes is a pathogen responsible for severe cases of food poisoning. Listeria spp. strains occurring in soil and water environments may serve as a reservoir of resistance determinants for pathogenic L. monocytogenes strains. A large collection of Listeria spp. strains (155) isolated from natural, agricultural, and urban areas was screened for resistance to heavy metals and metalloids, and the presence of resistance determinants and extrachromosomal replicons. Of the tested strains, 35% were resistant to cadmium and 17% to arsenic. Sequence analysis of resistance plasmids isolated from strains of Listeria seeligeri and Listeria ivanovii, and the chromosome of L. seeligeri strain Sr73, identified a novel variant of the cadAC cadmium resistance efflux system, cadA6, that was functional in L. monocytogenes cells. The cadA6 cassette was detected in four Listeria species, including strains of L. monocytogenes, isolated from various countries and sources-environmental, food-associated, and clinical samples. This resistance cassette is harbored by four novel composite or non-composite transposons, which increases its potential for horizontal transmission. Since some cadAC cassettes may influence virulence and biofilm fo...Continue Reading

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Citations

Mar 27, 2021·Journal of Applied Microbiology·L PalaiodimouE M Fox

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Datasets Mentioned

BETA
MW124301
CP063072
MW124302
CP063071

Methods Mentioned

BETA
PCR
RepA
electrophoresis

Software Mentioned

Artemis
ISfinder
MUSCLE
MEGAX
PATRIC
Unicycler
Jalview
RAST

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