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  1. Article ; Online: The enzymatic properties of Arabidopsis thaliana DNA polymerase λ suggest a role in base excision repair.

    Morales-Ruiz, T / Beltrán-Melero, C / Ortega-Paredes, D / Luna-Morillo, J A / Martínez-Macías, M I / Roldán-Arjona, T / Ariza, R R / Córdoba-Cañero, D

    Plant molecular biology

    2024  Volume 114, Issue 1, Page(s) 3

    Abstract: Base excision repair (BER) generates gapped DNA intermediates containing a 5'-terminal 2-deoxyribose-5-phosphate (5'-dRP) group. In mammalian cells, gap filling and dRP removal are catalyzed by Pol β, which belongs to the X family of DNA polymerases. In ... ...

    Abstract Base excision repair (BER) generates gapped DNA intermediates containing a 5'-terminal 2-deoxyribose-5-phosphate (5'-dRP) group. In mammalian cells, gap filling and dRP removal are catalyzed by Pol β, which belongs to the X family of DNA polymerases. In higher plants, the only member of the X family of DNA polymerases is Pol λ. Although it is generally believed that plant Pol λ participates in BER, there is limited experimental evidence for this hypothesis. Here we have characterized the biochemical properties of Arabidopsis thaliana Pol λ (AtPol λ) in a BER context, using a variety of DNA repair intermediates. We have found that AtPol λ performs gap filling inserting the correct nucleotide, and that the rate of nucleotide incorporation is higher in substrates containing a C in the template strand. Gap filling catalyzed by AtPol λ is most efficient with a phosphate at the 5'-end of the gap and is not inhibited by the presence of a 5'-dRP mimic. We also show that AtPol λ possesses an intrinsic dRP lyase activity that is reduced by mutations at two lysine residues in its 8-kDa domain, one of which is present in Pol λ exclusively and not in any Pol β homolog. Importantly, we also found that the dRP lyase activity of AtPol λ allows efficient completion of uracil repair in a reconstituted short-patch BER reaction. These results suggest that AtPol λ plays an important role in plant BER.
    MeSH term(s) Animals ; Arabidopsis/genetics ; Arabidopsis/metabolism ; Excision Repair ; DNA-Directed DNA Polymerase/genetics ; DNA-Directed DNA Polymerase/chemistry ; DNA-Directed DNA Polymerase/metabolism ; DNA Repair ; Nucleotides ; Phosphates ; Mammals/metabolism ; DNA Polymerase beta
    Chemical Substances DNA polymerase beta2 (EC 2.7.7.-) ; DNA-Directed DNA Polymerase (EC 2.7.7.7) ; Nucleotides ; Phosphates ; DNA Polymerase beta (EC 2.7.7.7)
    Language English
    Publishing date 2024-01-13
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 778032-1
    ISSN 1573-5028 ; 0167-4412
    ISSN (online) 1573-5028
    ISSN 0167-4412
    DOI 10.1007/s11103-023-01407-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Ready-to-eat street food: a potential source for dissemination of multidrug-resistant Escherichia coli epidemic clones in Quito, Ecuador.

    Zurita, J / Yánez, F / Sevillano, G / Ortega-Paredes, D / Paz Y Miño, A

    Letters in applied microbiology

    2020  Volume 70, Issue 3, Page(s) 203–209

    Abstract: Ready-to-eat food contamination with ESBL-producing Escherichia coli is a growing health concern. Some of these strains also are epidemic clones and can cause community-associated infections that are difficult to treat. In this study, the occurrence of ... ...

    Abstract Ready-to-eat food contamination with ESBL-producing Escherichia coli is a growing health concern. Some of these strains also are epidemic clones and can cause community-associated infections that are difficult to treat. In this study, the occurrence of ESBL-producing E. coli contaminated ready-to-eat street food in Quito, Ecuador was evaluated. In total, 150 samples were collected randomly in the most crowded sites of the city. In all, 34 samples (34/150; 22·6%) were positive for total thermotolerant (44·5°C) coliforms resistant to cefotaxime. MALDI-TOF analysis identified that the E. coli was found in 20 food samples (20/34; 59%). ESBL gene bla
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Drug Resistance, Multiple, Bacterial/genetics ; Ecuador/epidemiology ; Escherichia coli/drug effects ; Escherichia coli/genetics ; Escherichia coli Infections/epidemiology ; Escherichia coli Infections/transmission ; Fast Foods/microbiology ; Food Contamination/analysis ; Humans ; Multilocus Sequence Typing ; Phylogeny ; beta-Lactamases/genetics
    Chemical Substances Anti-Bacterial Agents ; beta-Lactamases (EC 3.5.2.6)
    Language English
    Publishing date 2020-01-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 632584-1
    ISSN 1472-765X ; 0266-8254
    ISSN (online) 1472-765X
    ISSN 0266-8254
    DOI 10.1111/lam.13263
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Colistin-resistant Escherichia coli clinical isolate harbouring the mcr-1 gene in Ecuador.

    Ortega-Paredes, D / Barba, P / Zurita, J

    Epidemiology and infection

    2016  Volume 144, Issue 14, Page(s) 2967–2970

    Abstract: Colistin resistance mediated by the mcr-1 gene has been reported worldwide, but to date not from the Andean region, South America. We report the first clinical isolate of Escherichia coli harbouring the mcr-1 gene in Ecuador. The strain was isolated from ...

    Abstract Colistin resistance mediated by the mcr-1 gene has been reported worldwide, but to date not from the Andean region, South America. We report the first clinical isolate of Escherichia coli harbouring the mcr-1 gene in Ecuador. The strain was isolated from peritoneal fluid from a 14-year-old male with acute appendicitis, and subjected to molecular analysis. The minimum inhibitory concentration of colistin for the strain was 8 mg/ml and it was susceptible to carbapenems but resistant to tigecycline. The strain harboured mcr-1 and bla CTX-M-55 genes and was of sequence type 609. The recognition of an apparently commensal strain of E. coli harbouring mcr-1 serves as an alert to the presence in the region of this recently described resistance mechanism to one of the last line of drugs available for the treatment of multi-resistant Gram-negative infections.
    MeSH term(s) Acute Disease ; Adolescent ; Anti-Bacterial Agents/pharmacology ; Appendicitis/microbiology ; Colistin/pharmacology ; Drug Resistance, Bacterial ; Ecuador ; Escherichia coli/genetics ; Escherichia coli/physiology ; Escherichia coli Infections/microbiology ; Escherichia coli Proteins/genetics ; Humans ; Male ; Microbial Sensitivity Tests
    Chemical Substances Anti-Bacterial Agents ; Escherichia coli Proteins ; MCR-1 protein, E coli ; Colistin (Z67X93HJG1)
    Language English
    Publishing date 2016-06-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 632982-2
    ISSN 1469-4409 ; 0950-2688
    ISSN (online) 1469-4409
    ISSN 0950-2688
    DOI 10.1017/S0950268816001369
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Dominance of ST131, B2, blaCTX-M-15, and papA-papC-kpsMII-uitA among ESBL Escherichia coli isolated from bloodstream infections in Quito, Ecuador: a 10-year surveillance study (2009-2019).

    Zurita, Jeannete / Sevillano, Gabriela / Paz Y Miño, Ariane / Haro, Nathalí / Larrea-Álvarez, Marco / Alcocer, Iliana / Ortega-Paredes, David

    Journal of applied microbiology

    2023  Volume 134, Issue 11

    Abstract: Aims: This study aimed to examine antibiotic resistance and the epidemiology of extended-spectrum β-lactamases (ESBL)-producing Escherichia coli associated with bloodstream infections over a period of 10 years.: Methods and results: Isolates were ... ...

    Abstract Aims: This study aimed to examine antibiotic resistance and the epidemiology of extended-spectrum β-lactamases (ESBL)-producing Escherichia coli associated with bloodstream infections over a period of 10 years.
    Methods and results: Isolates were collected from January 2009 to December 2019 and those testing for E. coli were included. Antibiotic susceptibility was tested using the VITEK® system. Selected isolates were further characterized by amplification of marker genes (virulence traits, phylogroups, and sequence types). A total of 166 ESBL-producing E. coli were recovered. The blaCTX-M-15 allele was the most abundant. Most of the isolates were resistant to ceftriaxone, cefepime, ceftazidime, ampicillin/sulbactam, piperacillin/tazobactam, and ciprofloxacin. No resistance to carbapenems was registered. More than 80% of bacteria were classified as extraintestinal pathogenic E. coli (ExPEC), and the combination of virulence traits:papA-papC-kpsMII-uitA was the most common. Phylogroup B2 was the most prevalent, and bacteria predominantly belonged to ST131.
    Conclusions: There was an increase in the ExPEC ESBL-E coli in bloodstream infections and the relationship between the isolates found in these infections during these 10 years.
    MeSH term(s) Humans ; Escherichia coli ; Escherichia coli Infections/epidemiology ; Escherichia coli Infections/microbiology ; Ecuador/epidemiology ; beta-Lactamases/genetics ; Sepsis/microbiology ; Extraintestinal Pathogenic Escherichia coli ; Anti-Bacterial Agents/pharmacology
    Chemical Substances beta-Lactamases (EC 3.5.2.6) ; Anti-Bacterial Agents
    Language English
    Publishing date 2023-11-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 1358023-1
    ISSN 1365-2672 ; 1364-5072
    ISSN (online) 1365-2672
    ISSN 1364-5072
    DOI 10.1093/jambio/lxad269
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: In Silico Detection of Antimicrobial Resistance Integrons in

    Torres-Elizalde, Lilibeth / Ortega-Paredes, David / Loaiza, Karen / Fernández-Moreira, Esteban / Larrea-Álvarez, Marco

    Antibiotics (Basel, Switzerland)

    2021  Volume 10, Issue 11

    Abstract: Antimicrobial resistance genes are often associated with integrons, which promote their movement between and within DNA molecules. IntFinder 1.0 and I-VIP v1.2 were used for the detection of integrons and their associated resistance genes in assembled ... ...

    Abstract Antimicrobial resistance genes are often associated with integrons, which promote their movement between and within DNA molecules. IntFinder 1.0 and I-VIP v1.2 were used for the detection of integrons and their associated resistance genes in assembled sequences and raw reads. A dataset comprising 1688 sequenced
    Language English
    Publishing date 2021-11-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2681345-2
    ISSN 2079-6382
    ISSN 2079-6382
    DOI 10.3390/antibiotics10111388
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Evidence of SARS-CoV-2 reinfection within the same clade in Ecuador: A case study.

    Sevillano, Gabriela / Ortega-Paredes, David / Loaiza, Karen / Zurita-Salinas, Camilo / Zurita, Jeannete

    International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases

    2021  Volume 108, Page(s) 53–56

    Abstract: Objectives: To date, reported SARS-CoV-2 reinfection cases are mainly from strains belonging to different clades. As the pandemic advances, a few lineages have become dominant in certain areas leading to reinfections by similar strains. Here, we report ... ...

    Abstract Objectives: To date, reported SARS-CoV-2 reinfection cases are mainly from strains belonging to different clades. As the pandemic advances, a few lineages have become dominant in certain areas leading to reinfections by similar strains. Here, we report a reinfection case within the same clade of the initial infection in a symptomatic 28-year-old-male in Quito-Ecuador.
    Methods: Infection was detected by reverse transcription-polymerase chain reaction, and immune response evaluated by antibody testing. Whole-genome sequencing was performed and phylogenetic analysis conducted to determine relatedness.
    Results: Both the infection and the reinfection strains were assigned as Nextstrain 20B, Pangolin lineage B.1.1 and GISAID clade O. Our analysis indicated 4-6 fold more nucleotide changes than are expected for reactivation or persistence compared with the natural rate of SARS-CoV-2 mutation (∼2-3 nucleotide changes per month), thus supporting reinfection. Furthermore, approximately 3 months after the second infection, COVID-19 antibodies were not detectable in the patient, suggesting potential vulnerability to a third infection.
    Conclusions: Our results showed evidence of SARS-CoV-2 reinfection within the same clade in Ecuador, indicating that previous exposure to SARS-CoV-2 does not guarantee immunity in all cases.
    MeSH term(s) Adult ; COVID-19 ; Ecuador/epidemiology ; Humans ; Male ; Phylogeny ; Reinfection ; SARS-CoV-2
    Language English
    Publishing date 2021-04-27
    Publishing country Canada
    Document type Journal Article
    ZDB-ID 1331197-9
    ISSN 1878-3511 ; 1201-9712
    ISSN (online) 1878-3511
    ISSN 1201-9712
    DOI 10.1016/j.ijid.2021.04.073
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Ready‐to‐eat street food: a potential source for dissemination of multidrug‐resistant Escherichia coli epidemic clones in Quito, Ecuador

    Zurita, J / Yánez, F / Sevillano, G / Ortega‐Paredes, D / Paz y Miño, A

    Letters in applied microbiology. 2020 Mar., v. 70, no. 3

    2020  

    Abstract: Ready‐to‐eat food contamination with ESBL‐producing Escherichia coli is a growing health concern. Some of these strains also are epidemic clones and can cause community‐associated infections that are difficult to treat. In this study, the occurrence of ... ...

    Abstract Ready‐to‐eat food contamination with ESBL‐producing Escherichia coli is a growing health concern. Some of these strains also are epidemic clones and can cause community‐associated infections that are difficult to treat. In this study, the occurrence of ESBL‐producing E. coli contaminated ready‐to‐eat street food in Quito, Ecuador was evaluated. In total, 150 samples were collected randomly in the most crowded sites of the city. In all, 34 samples (34/150; 22·6%) were positive for total thermotolerant (44·5°C) coliforms resistant to cefotaxime. MALDI‐TOF analysis identified that the E. coli was found in 20 food samples (20/34; 59%). ESBL gene blaCTX‐M‐55 was identified in nine isolates, blaCTX‐M‐15 in six isolates, blaCTX‐M‐14 in two isolates, and one isolate each harboured blaCTX‐M‐24, blaCTX‐M‐65, blaCTX‐M‐55 and blaCTX‐M‐8. Phylogenetic groups like A and B1 were the most common, followed by groups D and B2. MLST analysis identified 12 different sequence types (STs), the most common was ST162. Recognized epidemic clonal groups ST410, ST131 and ST744 were encountered. Ready‐to‐eat street food is a potential way of spreading ESBL‐producing E. coli epidemic clones in Quito, Ecuador. SIGNIFICANCE AND IMPACT OF THE STUDY: This study identified ESBL‐producing Escherichia coli epidemic clones: ST131, ST410 and ST744 in ready‐to‐eat street food samples. Street food is a possible way to spread harm multidrug‐resistant (MDR) E. coli strains in the community. Studies to identify the contamination sources of this kind of food are needed to tackle MDR E. coli dissemination.
    Keywords Escherichia coli ; antibiotic resistance ; beta-lactamase bacteria ; cefotaxime ; clones ; coliform bacteria ; food contamination ; genes ; heat tolerance ; matrix-assisted laser desorption-ionization mass spectrometry ; multiple drug resistance ; phylogeny ; ready-to-eat foods ; street foods ; Ecuador
    Language English
    Dates of publication 2020-03
    Size p. 203-209.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 632584-1
    ISSN 1472-765X ; 0266-8254
    ISSN (online) 1472-765X
    ISSN 0266-8254
    DOI 10.1111/lam.13263
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Genetic diversity and drug resistance of

    Zurita, J / Espinel, N / Barba, P / Ortega-Paredes, D / Zurita-Salinas, C / Rojas, Y / Alcocer, I

    The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease

    2019  Volume 23, Issue 2, Page(s) 166–173

    Abstract: Background: The genetic diversity of : Objective: To investigate mutations related to drug resistance and bacterial genotypes in : Design: This was a retrospective study of : Results: Isolates showed mutations in the : Conclusion: This is ... ...

    Abstract Background: The genetic diversity of
    Objective: To investigate mutations related to drug resistance and bacterial genotypes in
    Design: This was a retrospective study of
    Results: Isolates showed mutations in the
    Conclusion: This is the first report from Ecuador; it describes five new mutations in
    MeSH term(s) Antitubercular Agents/pharmacology ; Drug Resistance, Bacterial/genetics ; Ecuador ; Genetic Variation ; Genotype ; Humans ; Isoniazid/pharmacology ; Minisatellite Repeats/genetics ; Mutation ; Mycobacterium tuberculosis/drug effects ; Mycobacterium tuberculosis/genetics ; Mycobacterium tuberculosis/isolation & purification ; Phenotype ; Retrospective Studies ; Rifampin/pharmacology ; Tuberculosis, Multidrug-Resistant/drug therapy ; Tuberculosis, Multidrug-Resistant/epidemiology ; Tuberculosis, Multidrug-Resistant/microbiology
    Chemical Substances Antitubercular Agents ; Isoniazid (V83O1VOZ8L) ; Rifampin (VJT6J7R4TR)
    Language English
    Publishing date 2019-02-26
    Publishing country France
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1385624-8
    ISSN 1815-7920 ; 1027-3719
    ISSN (online) 1815-7920
    ISSN 1027-3719
    DOI 10.5588/ijtld.18.0095
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: High quantities of multidrug-resistant Escherichia coli are present in the Machángara urban river in Quito, Ecuador.

    Ortega-Paredes, David / Barba, Pedro / Mena-López, Santiago / Espinel, Nathaly / Crespo, Verónica / Zurita, Jeannete

    Journal of water and health

    2020  Volume 18, Issue 1, Page(s) 67–76

    Abstract: Urban river pollution by multidrug-resistant (MDR) bacteria constitutes an important public health concern. Epidemiologically important strains of MDR Escherichia coli transmissible at the human-animal-environment interfaces are especially worrying. ... ...

    Abstract Urban river pollution by multidrug-resistant (MDR) bacteria constitutes an important public health concern. Epidemiologically important strains of MDR Escherichia coli transmissible at the human-animal-environment interfaces are especially worrying. Quantifying and characterizing MDR E. coli at a molecular level is thus imperative for understanding its epidemiology in natural environments and its role in the spread of resistance in precise geographical areas. Cefotaxime-resistant E. coli was characterized along the watercourse of the major urban river in Quito. Our results showed high quantities of cefotaxime-resistant E. coli (2.7 × 10
    MeSH term(s) Animals ; Anti-Bacterial Agents ; Drug Resistance, Multiple, Bacterial ; Ecuador ; Environmental Monitoring ; Escherichia coli ; Escherichia coli Infections ; Humans ; Microbial Sensitivity Tests ; Rivers/microbiology ; Water Microbiology
    Chemical Substances Anti-Bacterial Agents
    Language English
    Publishing date 2020-03-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 2123845-5
    ISSN 1996-7829 ; 1477-8920
    ISSN (online) 1996-7829
    ISSN 1477-8920
    DOI 10.2166/wh.2019.195
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Effects of

    Šefcová, Miroslava Anna / Ortega-Paredes, David / Larrea-Álvarez, César Marcelo / Mina, Iván / Guapás, Victoria / Ayala-Velasteguí, David / Leoro-Garzón, Paula / Molina-Cuasapaz, Gabriel / Vinueza-Burgos, Christian / Revajová, Viera / Larrea-Álvarez, Marco

    Microorganisms

    2023  Volume 11, Issue 2

    Abstract: There are no studies reporting the effects ... ...

    Abstract There are no studies reporting the effects of
    Language English
    Publishing date 2023-01-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2720891-6
    ISSN 2076-2607
    ISSN 2076-2607
    DOI 10.3390/microorganisms11020256
    Database MEDical Literature Analysis and Retrieval System OnLINE

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