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  1. Article: Multidrug Resistance in Salmonella enterica Serotype Typhimurium from Humans in France (1993 to 2003)

    Weill, François-Xavier / Guesnier, Françoise / Guibert, Véronique / Timinouni, Mohammed / Demartin, Marie / Polomack, Lucette / Grimont, Patrick A. D

    Journal of clinical microbiology. 2006 Mar., v. 44, no. 3

    2006  

    Abstract: The aim of this study was to determine the distribution of the antimicrobial resistance phenotypes (R types), the phage types and XbaI-pulsed-field gel electrophoresis (PFGE) types, the genes coding for resistance to {szligbeta}-lactams and to quinolones, ...

    Abstract The aim of this study was to determine the distribution of the antimicrobial resistance phenotypes (R types), the phage types and XbaI-pulsed-field gel electrophoresis (PFGE) types, the genes coding for resistance to {szligbeta}-lactams and to quinolones, and the class 1 integrons among a representative sample of Salmonella enterica serotype Typhimurium isolates collected from humans in 2002 through the French National Reference Center for Salmonella (NRC-Salm) network. The trends in the evolution of antimicrobial resistance of serotype Typhimurium were reviewed by using NRC-Salm data from 1993, 1997, 2000, and 2003. In 2002, 3,998 isolates of serotype Typhimurium were registered at the NRC-Salm among 11,775 serotyped S. enterica isolates (34%). The most common multiple antibiotic resistance pattern was resistance to amoxicillin, chloramphenicol, streptomycin and spectinomycin, sulfonamides, and tetracycline (ACSSpSuTe R type), with 156 isolates (48.8%). One isolate resistant to extended-spectrum cephalosporins due to the production of TEM-52 extended-spectrum {szligbeta}-lactamase was detected (0.3%), and one multidrug-resistant isolate was highly resistant to ciprofloxacin (MIC > 32 mg/liter). We found that 57.2% of the isolates tested belonged to the DT104 clone. The main resistance pattern of DT104 isolates was R type ACSSpSuTe (83.2%). However, evolutionary changes have occurred within DT104, involving both loss (variants of Salmonella genomic island 1) and acquisition of genes for drug resistance to trimethoprim or to quinolones. PFGE profile X1 was the most prevalent (74.5%) among DT104 isolates, indicating the need to use a more discriminatory subtyping method for such isolates. Global data from the NRC-Salm suggested that DT104 was the main cause of multidrug resistance in serotype Typhimurium from humans from at least 1997 to 2003, with a roughly stable prevalence during this period.
    Language English
    Dates of publication 2006-03
    Size p. 700-708.
    Publishing place American Society for Microbiology
    Document type Article
    ZDB-ID 390499-4
    ISSN 1098-660X ; 0095-1137
    ISSN (online) 1098-660X
    ISSN 0095-1137
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Evidence for a mechanism of recombination during reverse transcription dependent on the structure of the acceptor RNA.

    Moumen, Abdeladim / Polomack, Lucette / Unge, Torsten / Véron, Michel / Buc, Henri / Negroni, Matteo

    The Journal of biological chemistry

    2003  Volume 278, Issue 18, Page(s) 15973–15982

    Abstract: Genetic recombination is a major force driving retroviral evolution. In retroviruses, recombination proceeds mostly through copy choice during reverse transcription. Using a reconstituted in vitro system, we have studied the mechanism of strand transfer ... ...

    Abstract Genetic recombination is a major force driving retroviral evolution. In retroviruses, recombination proceeds mostly through copy choice during reverse transcription. Using a reconstituted in vitro system, we have studied the mechanism of strand transfer on a major recombination hot spot we previously identified within the genome of HIV-1. We show that on this model sequence the frequency of copy choice is strongly influenced by the folding of the RNA template, namely by the presence of a stable hairpin. This structure must be specifically present on the acceptor template. We previously proposed that strand transfer follows a two-step process: docking of the nascent DNA onto the acceptor RNA and strand invasion. The frequency of recombination under copy choice conditions was not dependent on the concentration of the acceptor RNA, in contrast with strand transfer occurring at strong arrests of reverse transcription. During copy choice strand transfer, the docking step is not rate limiting. We propose that the hairpin present on the acceptor RNA could mediate strand transfer following a mechanism reminiscent of branch migration during DNA recombination.
    MeSH term(s) HIV-1/genetics ; Nucleic Acid Conformation ; RNA, Viral/chemistry ; Recombination, Genetic/genetics ; Templates, Genetic ; Transcription, Genetic/genetics
    Chemical Substances RNA, Viral
    Language English
    Publishing date 2003-02-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.M212306200
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Multidrug resistance in Salmonella enterica serotype Typhimurium from humans in France (1993 to 2003).

    Weill, François-Xavier / Guesnier, Françoise / Guibert, Véronique / Timinouni, Mohammed / Demartin, Marie / Polomack, Lucette / Grimont, Patrick A D

    Journal of clinical microbiology

    2006  Volume 44, Issue 3, Page(s) 700–708

    Abstract: The aim of this study was to determine the distribution of the antimicrobial resistance phenotypes (R types), the phage types and XbaI-pulsed-field gel electrophoresis (PFGE) types, the genes coding for resistance to beta-lactams and to quinolones, and ... ...

    Abstract The aim of this study was to determine the distribution of the antimicrobial resistance phenotypes (R types), the phage types and XbaI-pulsed-field gel electrophoresis (PFGE) types, the genes coding for resistance to beta-lactams and to quinolones, and the class 1 integrons among a representative sample of Salmonella enterica serotype Typhimurium isolates collected from humans in 2002 through the French National Reference Center for Salmonella (NRC-Salm) network. The trends in the evolution of antimicrobial resistance of serotype Typhimurium were reviewed by using NRC-Salm data from 1993, 1997, 2000, and 2003. In 2002, 3,998 isolates of serotype Typhimurium were registered at the NRC-Salm among 11,775 serotyped S. enterica isolates (34%). The most common multiple antibiotic resistance pattern was resistance to amoxicillin, chloramphenicol, streptomycin and spectinomycin, sulfonamides, and tetracycline (ACSSpSuTe R type), with 156 isolates (48.8%). One isolate resistant to extended-spectrum cephalosporins due to the production of TEM-52 extended-spectrum beta-lactamase was detected (0.3%), and one multidrug-resistant isolate was highly resistant to ciprofloxacin (MIC > 32 mg/liter). We found that 57.2% of the isolates tested belonged to the DT104 clone. The main resistance pattern of DT104 isolates was R type ACSSpSuTe (83.2%). However, evolutionary changes have occurred within DT104, involving both loss (variants of Salmonella genomic island 1) and acquisition of genes for drug resistance to trimethoprim or to quinolones. PFGE profile X1 was the most prevalent (74.5%) among DT104 isolates, indicating the need to use a more discriminatory subtyping method for such isolates. Global data from the NRC-Salm suggested that DT104 was the main cause of multidrug resistance in serotype Typhimurium from humans from at least 1997 to 2003, with a roughly stable prevalence during this period.
    MeSH term(s) Bacteriophage Typing ; Base Sequence ; DNA, Bacterial/genetics ; DNA, Bacterial/isolation & purification ; Drug Resistance, Multiple, Bacterial/genetics ; Electrophoresis, Gel, Pulsed-Field ; Evolution, Molecular ; France ; Genes, Bacterial ; Humans ; Integrons ; Microbial Sensitivity Tests ; Phenotype ; Salmonella Food Poisoning/microbiology ; Salmonella Phages/classification ; Salmonella Phages/isolation & purification ; Salmonella typhimurium/drug effects ; Salmonella typhimurium/genetics ; Salmonella typhimurium/isolation & purification ; Salmonella typhimurium/virology ; Time Factors
    Chemical Substances DNA, Bacterial
    Language English
    Publishing date 2006-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 390499-4
    ISSN 1098-660X ; 0095-1137
    ISSN (online) 1098-660X
    ISSN 0095-1137
    DOI 10.1128/JCM.44.3.700-708.2006
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Chromosomal integration of the extended-spectrum beta-lactamase gene blaCTX-M-15 in Salmonella enterica serotype Concord isolates from internationally adopted children.

    Fabre, Laëtitia / Delauné, Aurélia / Espié, Emmanuelle / Nygard, Karin / Pardos de la Gandara, Maria / Polomack, Lucette / Guesnier, Françoise / Galimand, Marc / Lassen, Jørgen / Weill, François-Xavier

    Antimicrobial agents and chemotherapy

    2009  Volume 53, Issue 5, Page(s) 1808–1816

    Abstract: We report the emergence of Salmonella enterica isolates of serotype Concord (and its monophasic variant 6,7:l,v:-) producing the extended-spectrum beta-lactamases (ESBLs) SHV-12 and CTX-M-15 in France and Norway between 2001 and 2006 (43 in France and 26 ...

    Abstract We report the emergence of Salmonella enterica isolates of serotype Concord (and its monophasic variant 6,7:l,v:-) producing the extended-spectrum beta-lactamases (ESBLs) SHV-12 and CTX-M-15 in France and Norway between 2001 and 2006 (43 in France and 26 in Norway). The majority of these isolates were from adopted children from Ethiopia, most of whom were healthy carriers. Several symptomatic secondary cases were found in the adoptive families and health care facilities in France. Serotype Concord isolates collected before 2003 produced SHV-12 encoded on a 340-kb conjugative plasmid of replicon IncI1. Isolates collected after 2003 produced CTX-M-15. We detected two conjugative plasmids carrying bla(CTX-M-15). One plasmid, approximately 300 kb in size, was positive for the IncHI2 replicon and the plasmid-mediated quinolone resistance gene qnrA1. The other plasmid, from one of the earliest CTX-M-15-producing isolates collected, was a fusion plasmid with IncY and IncA/C(2) replicons and was 200 kb in size. However, we showed, using Southern hybridization of I-CeuI-digested chromosomal DNA and S1 nuclease analysis of plasmid DNA, that most isolates had a bla(CTX-M-15) gene located on chromosomal DNA. Analysis of the flanking regions of the chromosomally located bla(CTX-M-15) gene by cloning revealed an ISEcp1 truncated by an intact IS26 upstream from the bla(CTX-M-15) gene and a truncated orf477 gene downstream from bla(CTX-M-15). We found regions beyond the IS26 and the orf477 genes that were derived from IncA/C(2) plasmids, suggesting the chromosomal integration of part of the bla(CTX-M-15)-carrying IncY and IncA/C(2) fusion plasmid from early CTX-M-15-producing isolates.
    MeSH term(s) Adoption ; Adult ; Aged, 80 and over ; Anti-Bacterial Agents/pharmacology ; Child, Preschool ; Chromosomes, Bacterial/genetics ; Conjugation, Genetic ; Drug Resistance, Bacterial/genetics ; Electrophoresis, Gel, Pulsed-Field ; France/epidemiology ; Humans ; Infant ; Internationality ; Microbial Sensitivity Tests ; Norway/epidemiology ; Plasmids ; Salmonella Infections/epidemiology ; Salmonella Infections/microbiology ; Salmonella enterica/classification ; Salmonella enterica/drug effects ; Salmonella enterica/enzymology ; Salmonella enterica/genetics ; Salmonella enterica/isolation & purification ; Serotyping ; beta-Lactamases/genetics
    Chemical Substances Anti-Bacterial Agents ; beta-lactamase CTX-M-15 (EC 3.5.2.-) ; beta-Lactamases (EC 3.5.2.6)
    Language English
    Publishing date 2009-03-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 217602-6
    ISSN 1098-6596 ; 0066-4804
    ISSN (online) 1098-6596
    ISSN 0066-4804
    DOI 10.1128/AAC.00451-08
    Database MEDical Literature Analysis and Retrieval System OnLINE

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