Comparative Genomics of Vancomycin-Resistant <named-content content-type="genus-species">Staphylococcus aureus</named-content> Strains and Their Positions within the Clade Most Commonly Associated with Methicillin-Resistant <named-content content-type="genus-species">S. aureus</named-content> Hospital-Acquired Infection in the United States

ABSTRACT Methicillin-resistant Staphylococcus aureus (MRSA) strains are leading causes of hospital-acquired infections in the United States, and clonal cluster 5 (CC5) is the predominant lineage responsible for these infections. Since 2002, there have been 12 cases of vancomycin-resistant S. aureus...

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Autores principales:	Veronica N. Kos, Christopher A. Desjardins, Allison Griggs, Gustavo Cerqueira, Andries Van Tonder, Matthew T. G. Holden, Paul Godfrey, Kelli L. Palmer, Kip Bodi, Emmanuel F. Mongodin, Jennifer Wortman, Michael Feldgarden, Trevor Lawley, Steven R. Gill, Brian J. Haas, Bruce Birren, Michael S. Gilmore
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2012
Materias:	Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/81de22ce11624a3892ad5cd983af5918
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spelling	oai:doaj.org-article:81de22ce11624a3892ad5cd983af59182021-11-15T15:39:02ZComparative Genomics of Vancomycin-Resistant <named-content content-type="genus-species">Staphylococcus aureus</named-content> Strains and Their Positions within the Clade Most Commonly Associated with Methicillin-Resistant <named-content content-type="genus-species">S. aureus</named-content> Hospital-Acquired Infection in the United States10.1128/mBio.00112-122150-7511https://doaj.org/article/81de22ce11624a3892ad5cd983af59182012-07-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mBio.00112-12https://doaj.org/toc/2150-7511ABSTRACT Methicillin-resistant Staphylococcus aureus (MRSA) strains are leading causes of hospital-acquired infections in the United States, and clonal cluster 5 (CC5) is the predominant lineage responsible for these infections. Since 2002, there have been 12 cases of vancomycin-resistant S. aureus (VRSA) infection in the United States—all CC5 strains. To understand this genetic background and what distinguishes it from other lineages, we generated and analyzed high-quality draft genome sequences for all available VRSA strains. Sequence comparisons show unambiguously that each strain independently acquired Tn1546 and that all VRSA strains last shared a common ancestor over 50 years ago, well before the occurrence of vancomycin resistance in this species. In contrast to existing hypotheses on what predisposes this lineage to acquire Tn1546, the barrier posed by restriction systems appears to be intact in most VRSA strains. However, VRSA (and other CC5) strains were found to possess a constellation of traits that appears to be optimized for proliferation in precisely the types of polymicrobic infection where transfer could occur. They lack a bacteriocin operon that would be predicted to limit the occurrence of non-CC5 strains in mixed infection and harbor a cluster of unique superantigens and lipoproteins to confound host immunity. A frameshift in dprA, which in other microbes influences uptake of foreign DNA, may also make this lineage conducive to foreign DNA acquisition. IMPORTANCE Invasive methicillin-resistant Staphylococcus aureus (MRSA) infection now ranks among the leading causes of death in the United States. Vancomycin is a key last-line bactericidal drug for treating these infections. However, since 2002, vancomycin resistance has entered this species. Of the now 12 cases of vancomycin-resistant S. aureus (VRSA), each was believed to represent a new acquisition of the vancomycin-resistant transposon Tn1546 from enterococcal donors. All acquisitions of Tn1546 so far have occurred in MRSA strains of the clonal cluster 5 genetic background, the most common hospital lineage causing hospital-acquired MRSA infection. To understand the nature of these strains, we determined and examined the nucleotide sequences of the genomes of all available VRSA. Genome comparison identified candidate features that position strains of this lineage well for acquiring resistance to antibiotics in mixed infection.Veronica N. KosChristopher A. DesjardinsAllison GriggsGustavo CerqueiraAndries Van TonderMatthew T. G. HoldenPaul GodfreyKelli L. PalmerKip BodiEmmanuel F. MongodinJennifer WortmanMichael FeldgardenTrevor LawleySteven R. GillBrian J. HaasBruce BirrenMichael S. GilmoreAmerican Society for MicrobiologyarticleMicrobiologyQR1-502ENmBio, Vol 3, Iss 3 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Microbiology QR1-502
spellingShingle	Microbiology QR1-502 Veronica N. Kos Christopher A. Desjardins Allison Griggs Gustavo Cerqueira Andries Van Tonder Matthew T. G. Holden Paul Godfrey Kelli L. Palmer Kip Bodi Emmanuel F. Mongodin Jennifer Wortman Michael Feldgarden Trevor Lawley Steven R. Gill Brian J. Haas Bruce Birren Michael S. Gilmore Comparative Genomics of Vancomycin-Resistant <named-content content-type="genus-species">Staphylococcus aureus</named-content> Strains and Their Positions within the Clade Most Commonly Associated with Methicillin-Resistant <named-content content-type="genus-species">S. aureus</named-content> Hospital-Acquired Infection in the United States
description	ABSTRACT Methicillin-resistant Staphylococcus aureus (MRSA) strains are leading causes of hospital-acquired infections in the United States, and clonal cluster 5 (CC5) is the predominant lineage responsible for these infections. Since 2002, there have been 12 cases of vancomycin-resistant S. aureus (VRSA) infection in the United States—all CC5 strains. To understand this genetic background and what distinguishes it from other lineages, we generated and analyzed high-quality draft genome sequences for all available VRSA strains. Sequence comparisons show unambiguously that each strain independently acquired Tn1546 and that all VRSA strains last shared a common ancestor over 50 years ago, well before the occurrence of vancomycin resistance in this species. In contrast to existing hypotheses on what predisposes this lineage to acquire Tn1546, the barrier posed by restriction systems appears to be intact in most VRSA strains. However, VRSA (and other CC5) strains were found to possess a constellation of traits that appears to be optimized for proliferation in precisely the types of polymicrobic infection where transfer could occur. They lack a bacteriocin operon that would be predicted to limit the occurrence of non-CC5 strains in mixed infection and harbor a cluster of unique superantigens and lipoproteins to confound host immunity. A frameshift in dprA, which in other microbes influences uptake of foreign DNA, may also make this lineage conducive to foreign DNA acquisition. IMPORTANCE Invasive methicillin-resistant Staphylococcus aureus (MRSA) infection now ranks among the leading causes of death in the United States. Vancomycin is a key last-line bactericidal drug for treating these infections. However, since 2002, vancomycin resistance has entered this species. Of the now 12 cases of vancomycin-resistant S. aureus (VRSA), each was believed to represent a new acquisition of the vancomycin-resistant transposon Tn1546 from enterococcal donors. All acquisitions of Tn1546 so far have occurred in MRSA strains of the clonal cluster 5 genetic background, the most common hospital lineage causing hospital-acquired MRSA infection. To understand the nature of these strains, we determined and examined the nucleotide sequences of the genomes of all available VRSA. Genome comparison identified candidate features that position strains of this lineage well for acquiring resistance to antibiotics in mixed infection.
format	article
author	Veronica N. Kos Christopher A. Desjardins Allison Griggs Gustavo Cerqueira Andries Van Tonder Matthew T. G. Holden Paul Godfrey Kelli L. Palmer Kip Bodi Emmanuel F. Mongodin Jennifer Wortman Michael Feldgarden Trevor Lawley Steven R. Gill Brian J. Haas Bruce Birren Michael S. Gilmore
author_facet	Veronica N. Kos Christopher A. Desjardins Allison Griggs Gustavo Cerqueira Andries Van Tonder Matthew T. G. Holden Paul Godfrey Kelli L. Palmer Kip Bodi Emmanuel F. Mongodin Jennifer Wortman Michael Feldgarden Trevor Lawley Steven R. Gill Brian J. Haas Bruce Birren Michael S. Gilmore
author_sort	Veronica N. Kos
title	Comparative Genomics of Vancomycin-Resistant <named-content content-type="genus-species">Staphylococcus aureus</named-content> Strains and Their Positions within the Clade Most Commonly Associated with Methicillin-Resistant <named-content content-type="genus-species">S. aureus</named-content> Hospital-Acquired Infection in the United States
title_short	Comparative Genomics of Vancomycin-Resistant <named-content content-type="genus-species">Staphylococcus aureus</named-content> Strains and Their Positions within the Clade Most Commonly Associated with Methicillin-Resistant <named-content content-type="genus-species">S. aureus</named-content> Hospital-Acquired Infection in the United States
title_full	Comparative Genomics of Vancomycin-Resistant <named-content content-type="genus-species">Staphylococcus aureus</named-content> Strains and Their Positions within the Clade Most Commonly Associated with Methicillin-Resistant <named-content content-type="genus-species">S. aureus</named-content> Hospital-Acquired Infection in the United States
title_fullStr	Comparative Genomics of Vancomycin-Resistant <named-content content-type="genus-species">Staphylococcus aureus</named-content> Strains and Their Positions within the Clade Most Commonly Associated with Methicillin-Resistant <named-content content-type="genus-species">S. aureus</named-content> Hospital-Acquired Infection in the United States
title_full_unstemmed	Comparative Genomics of Vancomycin-Resistant <named-content content-type="genus-species">Staphylococcus aureus</named-content> Strains and Their Positions within the Clade Most Commonly Associated with Methicillin-Resistant <named-content content-type="genus-species">S. aureus</named-content> Hospital-Acquired Infection in the United States
title_sort	comparative genomics of vancomycin-resistant <named-content content-type="genus-species">staphylococcus aureus</named-content> strains and their positions within the clade most commonly associated with methicillin-resistant <named-content content-type="genus-species">s. aureus</named-content> hospital-acquired infection in the united states
publisher	American Society for Microbiology
publishDate	2012
url	https://doaj.org/article/81de22ce11624a3892ad5cd983af5918
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