Evidence of diversity among epidemiologically related carbapenemase- producing Acinetobacter baumannii strains belonging to international clonal lineage II

Fabrizia Minandri, Silvia D'Arezzo, Luísa C S Antunes, Christine Pourcel, Luigi Principe, Nicola Petrosillo, Paolo Visca

Research output: Contribution to journalArticle

Abstract

Carbapenem-resistant Acinetobacter baumannii strains belonging to international clonal lineage II (ICL-II) have become predominant in intensive care units (ICUs) throughout Italy. Between 2005 and 2009, the carbapenem-hydrolyzing class D β-lactamase (CHDL) bla OXA-23 gene became more prevalent than bla OXA-58 among epidemic ICL-II strains showing extensive genetic similarity. These findings posed the question of whether CHDL gene replacement occurred in the homogeneous ICL-II population or a new OXA-23 clone(s) emerged and spread in ICUs. In this study, the changes in the ICL-II A. baumannii population and CHDL gene carriage were investigated in 30 genetically related isolates collected during the bla OXA-58-to- bla OXA-23 transition period. Pulsotyping, randomly amplified polymorphic DNA (RAPD) analysis, and multilocus sequence typing (MLST) results were combined with multilocus variable-number tandem-repeat (VNTR) analysis (MLVA-8), siderotyping, and plasmid profiling to improve genotype-based discrimination between isolates. Pulsotyping, RAPD analysis, and MLST clustered isolates into a single type. MLVA-8 identified 19 types that clustered into three complexes. All OXA-23-producing isolates formed a single complex, while OXA-58 producers were split into two complexes. Southern blot analysis of the physical localization and genetic context of the CHDL genes showed that bla OXA-58 was invariably located on plasmids, while bla OXA-23 was present within Tn2006 on the chromosome or both the chromosome and plasmids. These data indicate that the apparently homogeneous population of CHDL-producing ICL-II strains was composed of several independent strains and that, between 2005 and 2009, distinct OXA-23 producers displaced the preexisting OXA-58 producers. Thus, MLVA-8 appears to be a suitable tool not only for investigating A. baumannii population structure but also for high-resolution epidemiological typing.

Original languageEnglish
Pages (from-to)590-597
Number of pages8
JournalJournal of Clinical Microbiology
Volume50
Issue number3
DOIs
Publication statusPublished - Mar 2012

Fingerprint

Acinetobacter baumannii
Carbapenems
Multilocus Sequence Typing
Plasmids
Population
Genes
Intensive Care Units
Asp(5)-oxytocin
carbapenemase
Chromosomes
Minisatellite Repeats
DNA
Southern Blotting
Italy
Clone Cells
Genotype

ASJC Scopus subject areas

  • Microbiology (medical)

Cite this

Evidence of diversity among epidemiologically related carbapenemase- producing Acinetobacter baumannii strains belonging to international clonal lineage II. / Minandri, Fabrizia; D'Arezzo, Silvia; Antunes, Luísa C S; Pourcel, Christine; Principe, Luigi; Petrosillo, Nicola; Visca, Paolo.

In: Journal of Clinical Microbiology, Vol. 50, No. 3, 03.2012, p. 590-597.

Research output: Contribution to journalArticle

@article{6d0a77bff9734ef881e10e0ca93af490,
title = "Evidence of diversity among epidemiologically related carbapenemase- producing Acinetobacter baumannii strains belonging to international clonal lineage II",
abstract = "Carbapenem-resistant Acinetobacter baumannii strains belonging to international clonal lineage II (ICL-II) have become predominant in intensive care units (ICUs) throughout Italy. Between 2005 and 2009, the carbapenem-hydrolyzing class D β-lactamase (CHDL) bla OXA-23 gene became more prevalent than bla OXA-58 among epidemic ICL-II strains showing extensive genetic similarity. These findings posed the question of whether CHDL gene replacement occurred in the homogeneous ICL-II population or a new OXA-23 clone(s) emerged and spread in ICUs. In this study, the changes in the ICL-II A. baumannii population and CHDL gene carriage were investigated in 30 genetically related isolates collected during the bla OXA-58-to- bla OXA-23 transition period. Pulsotyping, randomly amplified polymorphic DNA (RAPD) analysis, and multilocus sequence typing (MLST) results were combined with multilocus variable-number tandem-repeat (VNTR) analysis (MLVA-8), siderotyping, and plasmid profiling to improve genotype-based discrimination between isolates. Pulsotyping, RAPD analysis, and MLST clustered isolates into a single type. MLVA-8 identified 19 types that clustered into three complexes. All OXA-23-producing isolates formed a single complex, while OXA-58 producers were split into two complexes. Southern blot analysis of the physical localization and genetic context of the CHDL genes showed that bla OXA-58 was invariably located on plasmids, while bla OXA-23 was present within Tn2006 on the chromosome or both the chromosome and plasmids. These data indicate that the apparently homogeneous population of CHDL-producing ICL-II strains was composed of several independent strains and that, between 2005 and 2009, distinct OXA-23 producers displaced the preexisting OXA-58 producers. Thus, MLVA-8 appears to be a suitable tool not only for investigating A. baumannii population structure but also for high-resolution epidemiological typing.",
author = "Fabrizia Minandri and Silvia D'Arezzo and Antunes, {Lu{\'i}sa C S} and Christine Pourcel and Luigi Principe and Nicola Petrosillo and Paolo Visca",
year = "2012",
month = "3",
doi = "10.1128/JCM.05555-11",
language = "English",
volume = "50",
pages = "590--597",
journal = "Journal of Clinical Microbiology",
issn = "0095-1137",
publisher = "American Society for Microbiology",
number = "3",

}

TY - JOUR

T1 - Evidence of diversity among epidemiologically related carbapenemase- producing Acinetobacter baumannii strains belonging to international clonal lineage II

AU - Minandri, Fabrizia

AU - D'Arezzo, Silvia

AU - Antunes, Luísa C S

AU - Pourcel, Christine

AU - Principe, Luigi

AU - Petrosillo, Nicola

AU - Visca, Paolo

PY - 2012/3

Y1 - 2012/3

N2 - Carbapenem-resistant Acinetobacter baumannii strains belonging to international clonal lineage II (ICL-II) have become predominant in intensive care units (ICUs) throughout Italy. Between 2005 and 2009, the carbapenem-hydrolyzing class D β-lactamase (CHDL) bla OXA-23 gene became more prevalent than bla OXA-58 among epidemic ICL-II strains showing extensive genetic similarity. These findings posed the question of whether CHDL gene replacement occurred in the homogeneous ICL-II population or a new OXA-23 clone(s) emerged and spread in ICUs. In this study, the changes in the ICL-II A. baumannii population and CHDL gene carriage were investigated in 30 genetically related isolates collected during the bla OXA-58-to- bla OXA-23 transition period. Pulsotyping, randomly amplified polymorphic DNA (RAPD) analysis, and multilocus sequence typing (MLST) results were combined with multilocus variable-number tandem-repeat (VNTR) analysis (MLVA-8), siderotyping, and plasmid profiling to improve genotype-based discrimination between isolates. Pulsotyping, RAPD analysis, and MLST clustered isolates into a single type. MLVA-8 identified 19 types that clustered into three complexes. All OXA-23-producing isolates formed a single complex, while OXA-58 producers were split into two complexes. Southern blot analysis of the physical localization and genetic context of the CHDL genes showed that bla OXA-58 was invariably located on plasmids, while bla OXA-23 was present within Tn2006 on the chromosome or both the chromosome and plasmids. These data indicate that the apparently homogeneous population of CHDL-producing ICL-II strains was composed of several independent strains and that, between 2005 and 2009, distinct OXA-23 producers displaced the preexisting OXA-58 producers. Thus, MLVA-8 appears to be a suitable tool not only for investigating A. baumannii population structure but also for high-resolution epidemiological typing.

AB - Carbapenem-resistant Acinetobacter baumannii strains belonging to international clonal lineage II (ICL-II) have become predominant in intensive care units (ICUs) throughout Italy. Between 2005 and 2009, the carbapenem-hydrolyzing class D β-lactamase (CHDL) bla OXA-23 gene became more prevalent than bla OXA-58 among epidemic ICL-II strains showing extensive genetic similarity. These findings posed the question of whether CHDL gene replacement occurred in the homogeneous ICL-II population or a new OXA-23 clone(s) emerged and spread in ICUs. In this study, the changes in the ICL-II A. baumannii population and CHDL gene carriage were investigated in 30 genetically related isolates collected during the bla OXA-58-to- bla OXA-23 transition period. Pulsotyping, randomly amplified polymorphic DNA (RAPD) analysis, and multilocus sequence typing (MLST) results were combined with multilocus variable-number tandem-repeat (VNTR) analysis (MLVA-8), siderotyping, and plasmid profiling to improve genotype-based discrimination between isolates. Pulsotyping, RAPD analysis, and MLST clustered isolates into a single type. MLVA-8 identified 19 types that clustered into three complexes. All OXA-23-producing isolates formed a single complex, while OXA-58 producers were split into two complexes. Southern blot analysis of the physical localization and genetic context of the CHDL genes showed that bla OXA-58 was invariably located on plasmids, while bla OXA-23 was present within Tn2006 on the chromosome or both the chromosome and plasmids. These data indicate that the apparently homogeneous population of CHDL-producing ICL-II strains was composed of several independent strains and that, between 2005 and 2009, distinct OXA-23 producers displaced the preexisting OXA-58 producers. Thus, MLVA-8 appears to be a suitable tool not only for investigating A. baumannii population structure but also for high-resolution epidemiological typing.

UR - http://www.scopus.com/inward/record.url?scp=84857407362&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84857407362&partnerID=8YFLogxK

U2 - 10.1128/JCM.05555-11

DO - 10.1128/JCM.05555-11

M3 - Article

C2 - 22205821

AN - SCOPUS:84857407362

VL - 50

SP - 590

EP - 597

JO - Journal of Clinical Microbiology

JF - Journal of Clinical Microbiology

SN - 0095-1137

IS - 3

ER -