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Friday, July 19, 2019

DNA target recognition domains in the Type I restriction and modification systems of Staphylococcus aureus.

Staphylococcus aureus displays a clonal population structure in which horizontal gene transfer between different lineages is extremely rare. This is due, in part, to the presence of a Type I DNA restriction–modification (RM) system given the generic name of Sau1, which maintains different patterns of methylation on specific target sequences on the genomes of different lineages. We have determined the target sequences recognized by the Sau1 Type I RM systems present in a wide range of the most prevalent S. aureus lineages and assigned the sequences recognized to particular target recognition domains within the RM enzymes. We used a range…

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Sunday, July 7, 2019

Turkey meat as source of CC9/CC398 methicillin-resistant Staphylococcus aureus in humans?

Livestock-associated methicillin-resistant Staphylococcus aureus (MRSA) of clonal complex (CC) 398 were first reported to cause severe infections in humans in 2005 [1]. Direct animal exposure is considered the most effective means of MRSA CC398 transmission from livestock to humans. However, about 20%–38% of MRSA CC398 cases among humans cannot be epidemiologically linked to direct livestock contact, indicating other transmission pathways [2]. As recently reported in this journal by Larsen et al [3], poultry meat may serve as a vehicle for livestock-to-human transmission. Here, we present similar findings for CC9/CC398 MRSA (displaying spa type t899 and related), which shares unique characteristics…

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Sunday, July 7, 2019

Complete genome and plasmid sequences of Staphylococcus aureus EDCC 5055 (DSM 28763), used to study implant-associated infections.

Staphylococcus aureus EDCC 5055 (DSM 28763) is a human clinical wound isolate intensively used to study implant-associated infections in rabbit and rat infection models. Here, we report its complete genome sequence (2,794,437 bp) along with that of one plasmid (27,437 bp). This strain belongs to sequence type 8 and contains a mecA gene. Copyright © 2017 Mannala et al.

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Sunday, July 7, 2019

Genomic analysis of ST88 community-acquired methicillin resistant Staphylococcus aureus in Ghana.

The emergence and evolution of community-acquired methicillin resistant Staphylococcus aureus (CA-MRSA) strains in Africa is poorly understood. However, one particular MRSA lineage called ST88, appears to be rapidly establishing itself as an “African” CA-MRSA clone. In this study, we employed whole genome sequencing to provide more information on the genetic background of ST88 CA-MRSA isolates from Ghana and to describe in detail ST88 CA-MRSA isolates in comparison with other MRSA lineages worldwide.We first established a complete ST88 reference genome (AUS0325) using PacBio SMRT sequencing. We then used comparative genomics to assess relatedness among 17 ST88 CA-MRSA isolates recovered from patients…

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Sunday, July 7, 2019

The recent emergence in hospitals of multidrug-resistant community-associated sequence type 1 and spa type t127 methicillin-resistant Staphylococcus aureus investigated by whole-genome sequencing: Implications for screening.

Community-associated spa type t127/t922 methicillin-resistant Staphylococcus aureus (MRSA) prevalence increased from 1%-7% in Ireland between 2010-2015. This study tracked the spread of 89 such isolates from June 2013-June 2016. These included 78 healthcare-associated and 11 community associated-MRSA isolates from a prolonged hospital outbreak (H1) (n = 46), 16 other hospitals (n = 28), four other healthcare facilities (n = 4) and community-associated sources (n = 11). Isolates underwent antimicrobial susceptibility testing, DNA microarray profiling and whole-genome sequencing. Minimum spanning trees were generated following core-genome multilocus sequence typing and pairwise single nucleotide variation (SNV) analysis was performed. All isolates were sequence…

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Sunday, July 7, 2019

Acquisition of virulence factors in livestock-associated MRSA: Lysogenic conversion of CC398 strains by virulence gene-containing phages.

Staphylococcus aureus MRSA strains belonging to the clonal complex 398 (CC398) are highly prevalent in livestock and companion animals but may also cause serious infections in humans. CC398 strains in livestock usually do not possess well-known virulence factors that can be frequently found in other MRSA sequence types (ST). Since many staphylococcal virulence genes are residing on the genomes of temperate phages, the question arises why livestock-associated (LA-) CC398 strains are only rarely infected by those phages. We isolated and characterized four temperate phages (P240, P282, P630 and P1105) containing genes of the immune evasion cluster (IEC) and/or for the…

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Sunday, July 7, 2019

Complete genome sequence of a community-associated methicillin-resistant Staphylococcusaureus hypervirulent strain, USA300-C2406, isolated from a patient with a lethal case of necrotizing pneumonia.

USA300 is a predominant community-associated methicillin-resistant Staphylococcus aureus strain causing significant morbidity and mortality. We present here the full annotated genome of a USA300 hypervirulent clinical strain, USA300-C2406, isolated from a patient with a lethal case of necrotizing pneumonia, to gain a better understanding of USA300 hypervirulence. Copyright © 2017 McClure and Zhang.

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Sunday, July 7, 2019

Complete genome sequences of five representative Staphylococcus aureus ST398 strains from five major sequence heterogeneity groups of a diverse isolate collection.

Staphylococcus aureus sequence type 398 (ST398) is a rapidly emerging livestock-associated strain causing zoonotic disease in humans. The course of pathogen evolution remains unclear, prompting whole-genome comparative studies in attempts to elucidate this issue. We present the full, annotated genomes of five newly isolated representative ST398 strains from five major sequence heterogeneity groups of our diverse isolate collection. Copyright © 2017 McClure and Zhang.

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Sunday, July 7, 2019

Zinc resistance within swine associated methicillin resistant staphylococcus aureus (MRSA) Isolates in the USA is associated with MLST lineage.

Zinc resistance in livestock-associated methicillin resistant Staphylococcus aureus (LA-MRSA) sequence type (ST) 398 is primarily mediated by the czrC gene co-located with the mecA gene, encoding methicillin resistance, within the type V SCCmec element. Because czrC and mecA are located within the same mobile genetic element, it has been suggested that the use of in feed zinc as an antidiarrheal agent has the potential to contribute to the emergence and spread of MRSA in swine through increased selection pressure to maintain the SCCmec element in isolates obtained from pigs. In this study we report the prevalence of the czrC gene…

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Sunday, July 7, 2019

Complete genome sequence of the methicillin-resistant Staphylococcus aureus colonizing strain M92.

M92 is a methicillin-resistant Staphylococcus aureus (MRSA) colonizing strain belonging to ST239-MRSA-III. It frequently shows local nasal colonization in our hospital staff, but has never been associated with infection. We sequenced the complete genome of M92, in order to compare it to highly virulent MRSA strains to gain insight into MRSA virulence factors. Copyright © 2017 McClure and Zhang.

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