Untranslated sequence upstream of MarA in the multiple antibiotic resistance locus ofEscherichia coli is related to the effector-binding domain of the XylS transcriptional activator

1996 ◽  
Vol 42 (4) ◽  
pp. 409-413 ◽  
Author(s):  
Herbert Hächler ◽  
Seth P. Cohen ◽  
Stuart B. Levy
Keyword(s):  
Antibiotic Resistance ◽  
Transcriptional Activator ◽  
Binding Domain ◽  
Ofescherichia Coli ◽  
Resistance Locus ◽  
Multiple Antibiotic Resistance ◽  
Untranslated Sequence ◽  
Effector Binding

scholarly journals Ferric Dicitrate Transport System (Fec) of Shigella flexneri 2a YSH6000 Is Encoded on a Novel Pathogenicity Island Carrying Multiple Antibiotic Resistance Genes

2001 ◽  
Vol 69 (10) ◽  
pp. 6012-6021 ◽  
Author(s):  
Shelley N. Luck ◽  
Sally A. Turner ◽  
Kumar Rajakumar ◽  
Harry Sakellaris ◽  
Ben Adler
Keyword(s):  
Antibiotic Resistance ◽  
Iron Uptake ◽  
Culture Media ◽  
Shigella Flexneri ◽  
Antibiotic Resistance Genes ◽  
Resistance Locus ◽  
Uptake System ◽  
Bacterial Survival ◽  
Multiple Antibiotic Resistance ◽  
Insertional Inactivation

ABSTRACT Iron uptake systems which are critical for bacterial survival and which may play important roles in bacterial virulence are often carried on mobile elements, such as plasmids and pathogenicity islands (PAIs). In the present study, we identified and characterized a ferric dicitrate uptake system (Fec) in Shigella flexneriserotype 2a that is encoded by a novel PAI termed theShigella resistance locus (SRL) PAI. Thefec genes are transcribed in S. flexneri, and complementation of a fec deletion inEscherichia coli demonstrated that they are functional. However, insertional inactivation of fecI, leading to a loss in fec gene expression, did not impair the growth of the parent strain of S. flexneri in iron-limited culture media, suggesting that S. flexneri carries additional iron uptake systems capable of compensating for the loss of Fec-mediated iron uptake. DNA sequence analysis showed that thefec genes are linked to a cluster of multiple antibiotic resistance determinants, designated the SRL, on the chromosome ofS. flexneri 2a. Both the SRL and fec loci are carried on the 66,257-bp SRL PAI, which has integrated into theserX tRNA gene and which carries at least 22 prophage-related open reading frames, including one for a P4-like integrase. This is the first example of a PAI that carries genes encoding antibiotic resistance and the first report of a ferric dicitrate uptake system in Shigella.

scholarly journals Multiple Antibiotic Resistance Patterns ofEscherichia coli Isolates from Swine Farms

1999 ◽  
Vol 65 (6) ◽  
pp. 2770-2772 ◽  
Author(s):  
A. G. Mathew ◽  
A. M. Saxton ◽  
W. G. Upchurch ◽  
S. E. Chattin
Keyword(s):  
Escherichia Coli ◽  
Antibiotic Resistance ◽  
Antibiotic Use ◽  
Ofescherichia Coli ◽  
Multiple Antibiotic Resistance ◽  
E Coli ◽  
Swine Farms ◽  
Resistance Patterns ◽  
Antibiotic Resistance Patterns ◽  
Farm Types

ABSTRACT Antibiotic resistance of Escherichia coli from sows and pigs was determined to compare patterns between pigs of various ages and degrees of antibiotic use. Resistance patterns differed between farm types and pigs of differing ages, indicating that pig age and degree of antibiotic use affect resistance of fecal E. coli.

scholarly journals Molecular Epidemiology of the SRL Pathogenicity Island

2003 ◽  
Vol 47 (2) ◽  
pp. 727-734 ◽  
Author(s):  
Sally A. Turner ◽  
Shelley N. Luck ◽  
Harry Sakellaris ◽  
Kumar Rajakumar ◽  
Ben Adler
Keyword(s):  
Antibiotic Resistance ◽  
Molecular Epidemiology ◽  
Structural Variation ◽  
Shigella Flexneri ◽  
Pathogenicity Island ◽  
Enteric Pathogens ◽  
The Other ◽  
Resistance Locus ◽  
Multiple Antibiotic Resistance ◽  
Linkage Studies

ABSTRACT The Shigella resistance locus (SRL), which is carried on the SRL pathogenicity island (PAI) in Shigella flexneri 2a YSH6000, mediates resistance to the antibiotics streptomycin, ampicillin, chloramphenicol, and tetracycline. In the present study, we investigated the distribution and structural variation of the SRL and the SRL PAI in 71 Shigella isolates and 28 other enteric pathogens by PCR and Southern analysis. The SRL and SRL-related loci, although absent from the other enteric pathogens evaluated in this study, were found to be present in a number of Shigella isolates. SRL PAI markers were also present in the majority of strains carrying the SRL and SRL-related loci. PCR linkage studies with six of these strains demonstrated that the SRL is carried on elements similar in structure and organization to the YSH6000 SRL PAI, consistent with the hypothesis that the SRL PAI may be involved in the spread of multiple-antibiotic resistance in these strains.

Extended Spectrum Beta Lactamase (ESBL), bla TEM,bla SHVand bla CTX-M,resistance genes in Community and Healthcare Associated Gram Negative Bacteria from Osun State, Nigeria

2020 ◽  
Vol 20 ◽  
Author(s):  
Ganiyat Shitta ◽  
Olufunmilola Makanjuola ◽  
Olusolabomi Adefioye ◽  
Olugbenga Adekunle Olowe
Keyword(s):  
Antibiotic Resistance ◽  
Resistance Genes ◽  
Gram Negative Bacteria ◽  
Beta Lactamase ◽  
Multiple Antibiotic Resistance ◽  
Esbl Production ◽  
Gram Negative ◽  
Extended Spectrum Beta Lactamase ◽  
Healthcare Associated ◽  
Esbl Producers

Background: Extended Spectrum Beta Lactamase (ESBL) production in gram negative bacteria confers multiple antibiotic resistance, adversely affecting antimicrobial therapy in infected individuals. ESBLs result from mutations in β-lactamases encoded mainly by the bla TEM,bla SHVand bla CTX-Mgenes. The prevalence of ESBL producing bacteria has been on the increase globally especially its upsurge among isolates from community-acquired infections. Aim: To determine ESBL prevalence and identify ESBL genes among clinical isolates in Osun State, Nigeria. Material and Methods: A cross-sectional study was carried out from August 2016 –July 2017 in Osun State, Nigeria. Three hundred and sixty Gram negative bacteria recovered from clinical samples obtained from both community and healthcare associated infections were tested. They included147 Escherichia coli(40.8%), 116 Klebsiella spp(32.2%), 44 Pseudomo-nas aeruginosa(12.2%) and23 Proteus vulgaris (6.4%) isolates. Others were Acinetobacter baumannii, Serratia rubidae, Citrobacter spp, Enterobacter spp and Salmonella typhi. Disk diffusion antibiotic susceptibility testing was carried out, isolates were screened for ESBL production and confirmed using standard laboratory procedures. ESBLs resistance genes were identified by Polymerase Chain Reaction (PCR). Results: All isolates demonstrated multiple antibiotic resistance. Resistance to ampicillin, amoxicillin with clavulanate and erythromycin was 100%, whereas resistance to Imipenem was very low (5.0%). : Overall prevalence of ESBL producers was 41.4% with Klebsiellaspp as the highest ESBL producing Enterobacteriacaea. ESBL producers were more prevalent among the hospital pathogens than community pathogens, 58% vs 29.5% (p=0.003). ESBL genes were detected in all ESBL producers with the blaCTX-Mgene predominating (47.0%) followed by blaTEM(30.9%) and blaSHVgene was the least, 22.1%. The blaCTX-Mgene was also the most prevalent in the healthcare pathogens (62%) but it accounted for only 25% in those of community origin. Conclusion: A high prevalence of ESBL producing gram negative organisms occurs both in healthcare and in the community in our environment with the CTX-M variant predominating. Efforts to control spread of these pathogens should be addressed.

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