1
|
Cerbino GN, Traglia GM, Ayala Nuñez T, Parmeciano Di Noto G, Ramírez MS, Centrón D, Iriarte A, Quiroga C. Comparative genome analysis of the genus Shewanella unravels the association of key genetic traits with known and potential pathogenic lineages. Front Microbiol 2023; 14:1124225. [PMID: 36925471 PMCID: PMC10011109 DOI: 10.3389/fmicb.2023.1124225] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 02/06/2023] [Indexed: 03/06/2023] Open
Abstract
Shewanella spp. are Gram-negative rods widely disseminated in aquatic niches that can also be found in human-associated environments. In recent years, reports of infections caused by these bacteria have increased significantly. Mobilome and resistome analysis of a few species showed that they are versatile; however, comprehensive comparative studies in the genus are lacking. Here, we analyzed the genetic traits of 144 genomes from Shewanella spp. isolates focusing on the mobilome, resistome, and virulome to establish their evolutionary relationship and detect unique features based on their genome content and habitat. Shewanella spp. showed a great diversity of mobile genetic elements (MGEs), most of them associated with monophyletic lineages of clinical isolates. Furthermore, 79/144 genomes encoded at least one antimicrobial resistant gene with their highest occurrence in clinical-related lineages. CRISPR-Cas systems, which confer immunity against MGEs, were found in 41 genomes being I-E and I-F the more frequent ones. Virulome analysis showed that all Shewanella spp. encoded different virulence genes (motility, quorum sensing, biofilm, adherence, etc.) that may confer adaptive advantages for survival against hosts. Our data revealed that key accessory genes are frequently found in two major clinical-related groups, which encompass the opportunistic pathogens Shewanella algae and Shewanella xiamenensis together with several other species. This work highlights the evolutionary nature of Shewanella spp. genomes, capable of acquiring different key genetic traits that contribute to their adaptation to different niches and facilitate the emergence of more resistant and virulent isolates that impact directly on human and animal health.
Collapse
Affiliation(s)
- Gabriela N Cerbino
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Buenos Aires, Argentina
| | - German M Traglia
- Laboratorio de Biología Computacional, Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Teolincacihuatl Ayala Nuñez
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Buenos Aires, Argentina
| | - Gisela Parmeciano Di Noto
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Buenos Aires, Argentina
| | - María Soledad Ramírez
- Center for Applied Biotechnology Studies, Department of Biological Science, California State University, Fullerton, Fullerton, CA, United States
| | - Daniela Centrón
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Buenos Aires, Argentina
| | - Andrés Iriarte
- Laboratorio de Biología Computacional, Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Cecilia Quiroga
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Buenos Aires, Argentina
| |
Collapse
|
2
|
Ayala Nuñez T, Cerbino GN, Rapisardi MF, Quiroga C, Centrón D. Novel Mobile Integrons and Strain-Specific Integrase Genes within Shewanella spp. Unveil Multiple Lateral Genetic Transfer Events within The Genus. Microorganisms 2022; 10:microorganisms10061102. [PMID: 35744620 PMCID: PMC9229058 DOI: 10.3390/microorganisms10061102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 04/28/2022] [Accepted: 04/29/2022] [Indexed: 11/16/2022] Open
Abstract
Shewanella spp. are Gram-negative bacteria that thrive in aquatic niches and also can cause infectious diseases as opportunistic pathogens. Chromosomal (CI) and mobile integrons (MI) were previously described in some Shewanella isolates. Here, we evaluated the occurrence of integrase genes, the integron systems and their genetic surroundings in the genus. We identified 22 integrase gene types, 17 of which were newly described, showing traits of multiple events of lateral genetic transfer (LGT). Phylogenetic analysis showed that most of them were strain-specific, except for Shewanella algae, where SonIntIA-like may have co-evolved within the host as typical CIs. It is noteworthy that co-existence of up to five different integrase genes within a strain, as well as their wide dissemination to Alteromonadales, Vibrionales, Chromatiales, Oceanospirillales and Enterobacterales was observed. In addition, identification of two novel MIs suggests that continuous LGT events may have occurred resembling the behavior of class 1 integrons. The constant emergence of determinants associated to antimicrobial resistance worldwide, concomitantly with novel MIs in strains capable to harbor several types of integrons, may be an alarming threat for the recruitment of novel antimicrobial resistance gene cassettes in the genus Shewanella, with its consequent contribution towards multidrug resistance in clinical isolates.
Collapse
Affiliation(s)
- Teolincacihuatl Ayala Nuñez
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires CP1121, Argentina; (T.A.N.); (G.N.C.); (M.F.R.)
| | - Gabriela N. Cerbino
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires CP1121, Argentina; (T.A.N.); (G.N.C.); (M.F.R.)
| | - María Florencia Rapisardi
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires CP1121, Argentina; (T.A.N.); (G.N.C.); (M.F.R.)
| | - Cecilia Quiroga
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires CP1121, Argentina; (T.A.N.); (G.N.C.); (M.F.R.)
- Laboratorio de Investigación en Biología del ARN Bacteriano IMPaM (UBA/CONICET), Faculty of Medicine, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires CP1121, Argentina
- Correspondence: or (C.Q.); (D.C.); Tel.: +54-11-5285-3500 (C.Q.); +54-911-50987496 (D.C.)
| | - Daniela Centrón
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires CP1121, Argentina; (T.A.N.); (G.N.C.); (M.F.R.)
- Laboratorio de Investigaciones en Mecanismos de Resistencia a Antibióticos IMPaM (UBA/CONICET), Faculty of Medicine, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires CP1121, Argentina
- Correspondence: or (C.Q.); (D.C.); Tel.: +54-11-5285-3500 (C.Q.); +54-911-50987496 (D.C.)
| |
Collapse
|
3
|
Gilgado D, Pérez Calvo E, Pérez J, Dorado J, Cardoso G, Quiroga C, Scapellato J, Plotnikow G, Accoce M. Assessment of the effect of respiratory physiotherapy techniques on end-expiratory lung volume through electrical impedance tomography in healthy subjects. Med Intensiva 2021; 45:e53-e55. [PMID: 34839887 DOI: 10.1016/j.medine.2020.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 07/28/2020] [Indexed: 11/29/2022]
Affiliation(s)
- D Gilgado
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina.
| | - E Pérez Calvo
- Rehabilitation and Weaning Center, Clínica Basilea, CABA, Argentina
| | - J Pérez
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina
| | - J Dorado
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina
| | - G Cardoso
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina
| | - C Quiroga
- Intensive Care Unit, Sanatorio Anchorena Recoleta, CABA, Argentina
| | - J Scapellato
- Intensive Care Unit, Sanatorio Anchorena Recoleta, CABA, Argentina
| | - G Plotnikow
- Intensive Care Unit, Sanatorio Anchorena Recoleta, CABA, Argentina
| | - M Accoce
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina
| |
Collapse
|
4
|
Guerrero LD, Pérez MV, Orellana E, Piuri M, Quiroga C, Erijman L. Long-run bacteria-phage coexistence dynamics under natural habitat conditions in an environmental biotechnology system. ISME J 2021; 15:636-648. [PMID: 33067586 PMCID: PMC8027832 DOI: 10.1038/s41396-020-00802-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 09/21/2020] [Accepted: 10/01/2020] [Indexed: 01/30/2023]
Abstract
Bacterial viruses are widespread and abundant across natural and engineered habitats. They influence ecosystem functioning through interactions with their hosts. Laboratory studies of phage-host pairs have advanced our understanding of phenotypic and genetic diversification in bacteria and phages. However, the dynamics of phage-host interactions have been seldom recorded in complex natural environments. We conducted an observational metagenomic study of the dynamics of interaction between Gordonia and their phages using a three-year data series of samples collected from a full-scale wastewater treatment plant. The aim was to obtain a comprehensive picture of the coevolution dynamics in naturally evolving populations at relatively high time resolution. Coevolution was followed by monitoring changes over time in the CRISPR loci of Gordonia metagenome-assembled genome, and reciprocal changes in the viral genome. Genome-wide analysis indicated low strain variability of Gordonia, and almost clonal conservation of the trailer end of the CRISPR loci. Incorporation of newer spacers gave rise to multiple coexisting bacterial populations. The host population carrying a shorter CRISPR locus that contain only ancestral spacers, which has not acquired newer spacers against the coexisting phages, accounted for more than half of the total host abundance in the majority of samples. Phages genome co-evolved by introducing directional changes, with no preference for mutations within the protospacer and PAM regions. Metagenomic reconstruction of time-resolved variants of host and viral genomes revealed how the complexity at the population level has important consequences for bacteria-phage coexistence.
Collapse
Affiliation(s)
- Leandro D. Guerrero
- grid.423606.50000 0001 1945 2152Instituto de Investigaciones en Ingeniería Genética y Biología Molecular “Dr Héctor N. Torres” (INGEBI-CONICET), Vuelta de Obligado 2490, C1428ADN Buenos Aires, Argentina
| | - María V. Pérez
- grid.423606.50000 0001 1945 2152Instituto de Investigaciones en Ingeniería Genética y Biología Molecular “Dr Héctor N. Torres” (INGEBI-CONICET), Vuelta de Obligado 2490, C1428ADN Buenos Aires, Argentina ,Agua y Saneamientos Argentinos S.A., Tucumán 752, C1049APP Buenos Aires, Argentina
| | - Esteban Orellana
- grid.423606.50000 0001 1945 2152Instituto de Investigaciones en Ingeniería Genética y Biología Molecular “Dr Héctor N. Torres” (INGEBI-CONICET), Vuelta de Obligado 2490, C1428ADN Buenos Aires, Argentina
| | - Mariana Piuri
- Departamento de Química Biológica, Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, CONICET, Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina
| | - Cecilia Quiroga
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM), Facultad de Medicina, Universidad de Buenos Aires, CONICET, Paraguay 2155, C1121ABG Buenos Aires, Argentina
| | - Leonardo Erijman
- grid.423606.50000 0001 1945 2152Instituto de Investigaciones en Ingeniería Genética y Biología Molecular “Dr Héctor N. Torres” (INGEBI-CONICET), Vuelta de Obligado 2490, C1428ADN Buenos Aires, Argentina ,grid.7345.50000 0001 0056 1981Departamento de Fisiología, Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires, Intendente Güiraldes 2160s, C1428EGA Buenos Aires, Argentina
| |
Collapse
|
5
|
Gilgado D, Pérez Calvo E, Pérez J, Dorado J, Cardoso G, Quiroga C, Scapellato J, Plotnikow G, Accoce M. Assessment of the effect of respiratory physiotherapy techniques on end-expiratory lung volume through electrical impedance tomography in healthy subjects. Med Intensiva 2020; 45:S0210-5691(20)30264-3. [PMID: 33071024 DOI: 10.1016/j.medin.2020.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 07/20/2020] [Accepted: 07/28/2020] [Indexed: 11/26/2022]
Affiliation(s)
- D Gilgado
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina.
| | - E Pérez Calvo
- Rehabilitation and Weaning Center, Clínica Basilea, CABA, Argentina
| | - J Pérez
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina
| | - J Dorado
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina
| | - G Cardoso
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina
| | - C Quiroga
- Intensive Care Unit, Sanatorio Anchorena Recoleta, CABA, Argentina
| | - J Scapellato
- Intensive Care Unit, Sanatorio Anchorena Recoleta, CABA, Argentina
| | - G Plotnikow
- Intensive Care Unit, Sanatorio Anchorena Recoleta, CABA, Argentina
| | - M Accoce
- Intensive Care Unit, Sanatorio Anchorena San Martín, Buenos Aires, Argentina
| |
Collapse
|
6
|
Hoard A, Montaña S, Moriano A, Fernandez JS, Traglia GM, Quiroga C, Franchi A, Cohen E, Corigliano C, Almuzara M, Ramirez MS. Genomic Analysis of two NDM-1 Providencia stuartii Strains Recovered from a Single Patient. Curr Microbiol 2020; 77:4029-4036. [PMID: 33048176 DOI: 10.1007/s00284-020-02242-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 10/01/2020] [Indexed: 12/18/2022]
Abstract
In the last years, an increasing number of untreatable infections caused by drug-resistant microbes have impacted the health care system. Worldwide, infections caused by carbapenem-resistant (CR) Gram-negative bacilli have dramatically increased. Among the CR-Gram-negative bacilli, those producing carbapenemases, such as NDM-1, are the main concern. Different Enterobacterales harboring NDM-1 have been reported lately. Providencia stuartii, a member of the Morganellaceae family, is ubiquitous in the environment, but is also known to cause nosocomial infections. Here we describe the genomic analysis of two NDM-1- producing P. stuartii strains recovered from the same patient as well as other carbapenem resistant strains recovered from the same hospital. As a result of the genomic analysis thirteen resistance genes, including three to β-lactams (blaOXA-1, blaTEM-1, blaNDM-1), four to aminoglycosides (aphA6, aac(3)-IId, aac(2')-Ia, aac(6')-Ib-cr5), one to sulfonamides (sul1), two to chloramphenicol (catB3, catA3), one to rifampicin, one to bleomycin (ble), and one to tetracycline (tet(B)) were found. Moreover, a variety of mobile genetic elements, such as insertion sequences, plasmids and phage- related sequences, were found within P. stuartii genomes. The spread of carbapenem-resistant isolates remains a significant clinical and public health concern. Therefore, we considered that the detection of CR isolates is an essential step in addressing this problem.
Collapse
Affiliation(s)
- Amparo Hoard
- Center for Applied Biotechnology Studies, Department of Biological Science, California State University Fullerton, Fullerton, CA, USA
| | - Sabrina Montaña
- Laboratorio de Bacteriología Clínica, Departamento de Bioquímica Clínica, Facultad de Farmacia Y Bioquímica, Hospital de Clínicas José de San Martín, Buenos Aires, Argentina
| | - Alessandro Moriano
- Center for Applied Biotechnology Studies, Department of Biological Science, California State University Fullerton, Fullerton, CA, USA
| | - Jennifer S Fernandez
- Center for Applied Biotechnology Studies, Department of Biological Science, California State University Fullerton, Fullerton, CA, USA
| | - German M Traglia
- Laboratorio de Bacteriología Clínica, Departamento de Bioquímica Clínica, Facultad de Farmacia Y Bioquímica, Hospital de Clínicas José de San Martín, Buenos Aires, Argentina
| | - Cecilia Quiroga
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas Y Tecnológicas, Instituto de Investigaciones en Microbiología Y Parasitología Médica (IMPAM), Facultad de Medicina, Paraguay 2155- C1121ABG, Buenos Aires, Argentina
| | - Agustina Franchi
- Laboratorio de Bacteriologia, Hospital Interzonal de Agudos Eva Perón, Provincia de Buenos Aires, San Martín, Argentina
| | - Emilia Cohen
- Laboratorio de Bacteriologia, Hospital Interzonal de Agudos Eva Perón, Provincia de Buenos Aires, San Martín, Argentina
| | - Cecilia Corigliano
- Laboratorio de Bacteriologia, Hospital Interzonal de Agudos Eva Perón, Provincia de Buenos Aires, San Martín, Argentina
| | - Marisa Almuzara
- Laboratorio de Bacteriologia, Hospital Interzonal de Agudos Eva Perón, Provincia de Buenos Aires, San Martín, Argentina
| | - Maria Soledad Ramirez
- Center for Applied Biotechnology Studies, Department of Biological Science, California State University Fullerton, Fullerton, CA, USA.
| |
Collapse
|
7
|
Ballén J, Quiroga C, Palma F. Síndrome inflamatorio de reconstitución inmune criptocócico: presentación inusual en la lengua. Actas Dermo-Sifiliográficas 2020; 111:617-619. [DOI: 10.1016/j.ad.2019.02.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 02/12/2019] [Accepted: 02/12/2019] [Indexed: 10/24/2022] Open
|
8
|
Álvarez VE, Quiroga MP, Galán AV, Vilacoba E, Quiroga C, Ramírez MS, Centrón D. Crucial Role of the Accessory Genome in the Evolutionary Trajectory of Acinetobacter baumannii Global Clone 1. Front Microbiol 2020; 11:342. [PMID: 32256462 PMCID: PMC7093585 DOI: 10.3389/fmicb.2020.00342] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 02/17/2020] [Indexed: 01/08/2023] Open
Abstract
Acinetobacter baumannii is one of the most important nosocomial pathogens able to rapidly develop extensive drug resistance. Here, we study the role of accessory genome in the success of the globally disseminated clone 1 (GC1) with functional and genomic approaches. Comparative genomics was performed with available GC1 genomes (n = 106) against other A. baumannii high-risk and sporadic clones. Genetic traits related to accessory genome were found common and conserved along time as two novel regions of genome plasticity, and a CRISPR-Cas system acquired before clonal diversification located at the same loci as “sedentary” modules. Although identified within hotspot for recombination, other block of accessory genome was also “sedentary” in lineage 1 of GC1 with signs of microevolution as the AbaR0-type genomic island (GI) identified in A144 and in A155 strains which were maintained one month in independent experiments without antimicrobial pressure. The prophage YMC/09/02/B1251_ABA_BP was found to be “mobile” since, although it was shared by all GC1 genomes, it showed high intrinsic microevolution as well as mobility to different insertion sites. Interestingly, a wide variety of Insertion Sequences (IS), probably acquired by the flow of plasmids related to Rep_3 superfamily was found. These IS showed dissimilar genomic location amongst GC1 genomes presumably associated with promptly niche adaptation. On the other hand, a type VI secretion system and three efflux pumps were subjected to deep processes of genomic loss in A. baumannii but not in GC1. As a whole, these findings suggest that preservation of some genetic modules of accessory genome harbored by strains from different continents in combination with great plasticity of IS and varied flow of plasmids, may be central features of the genomic structure of GC1. Competition of A144 and A155 versus A118 (ST 404/ND) without antimicrobial pressure suggested a higher ability of GC1 to grow over a clone with sporadic behavior which explains, from an ecological perspective, the global achievement of this successful pandemic clone in the hospital habitat. Together, these data suggest an essential role of still unknown properties of “mobile” and “sedentary” accessory genome that is preserved over time under different antibiotic or stress conditions.
Collapse
Affiliation(s)
- Verónica Elizabeth Álvarez
- Laboratorio de Investigaciones en Mecanismos de Resistencia a Antibióticos, Instituto de Investigaciones en Microbiología y Parasitología Médica, Facultad de Medicina, Universidad de Buenos Aires - Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| | - María Paula Quiroga
- Laboratorio de Investigaciones en Mecanismos de Resistencia a Antibióticos, Instituto de Investigaciones en Microbiología y Parasitología Médica, Facultad de Medicina, Universidad de Buenos Aires - Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| | - Angélica Viviana Galán
- Laboratorio de Investigaciones en Mecanismos de Resistencia a Antibióticos, Instituto de Investigaciones en Microbiología y Parasitología Médica, Facultad de Medicina, Universidad de Buenos Aires - Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| | - Elisabet Vilacoba
- Laboratorio de Investigaciones en Mecanismos de Resistencia a Antibióticos, Instituto de Investigaciones en Microbiología y Parasitología Médica, Facultad de Medicina, Universidad de Buenos Aires - Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| | - Cecilia Quiroga
- Instituto de Investigaciones en Microbiología y Parasitología Médica, Facultad de Medicina, Universidad de Buenos Aires - Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| | - María Soledad Ramírez
- Center for Applied Biotechnology Studies, Department of Biological Science, California State University Fullerton, Fullerton, CA, United States
| | - Daniela Centrón
- Laboratorio de Investigaciones en Mecanismos de Resistencia a Antibióticos, Instituto de Investigaciones en Microbiología y Parasitología Médica, Facultad de Medicina, Universidad de Buenos Aires - Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| |
Collapse
|
9
|
Abstract
Multidrug resistant bacteria are a serious worldwide problem, especially carbapenem-resistant Enterobacteriaceae (such as Klebsiella pneumoniae and Escherichia coli), Acinetobacter baumannii and Pseudomonas aeruginosa. Since the emergence of extensive and pan-drug resistant bacteria there are few antibiotics left to treat patients, thus novel RNA-based strategies are being considered. Here, we examine the current situation of different non-coding RNAs found in bacteria as well as their function and potential application as antimicrobial agents. Furthermore, we discuss the factors that may contribute in the efficient development of RNA-based drugs, the limitations for their implementation and the use of nanocarriers for delivery.
Collapse
Affiliation(s)
- Gisela Parmeciano Di Noto
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Buenos Aires, Argentina
| | - María Carolina Molina
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Buenos Aires, Argentina
| | - Cecilia Quiroga
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Buenos Aires, Argentina
| |
Collapse
|
10
|
Wolf IR, Paschoal AR, Quiroga C, Domingues DS, de Souza RF, Pretto-Giordano LG, Vilas-Boas LA. Functional annotation and distribution overview of RNA families in 27 Streptococcus agalactiae genomes. BMC Genomics 2018; 19:556. [PMID: 30055586 PMCID: PMC6064168 DOI: 10.1186/s12864-018-4951-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 07/22/2018] [Indexed: 01/08/2023] Open
Abstract
Background Streptococcus agalactiae, also known as Group B Streptococcus (GBS), is a Gram-positive bacterium that colonizes the gastrointestinal and genitourinary tract of humans. This bacterium has also been isolated from various animals, such as fish and cattle. Non-coding RNAs (ncRNAs) can act as regulators of gene expression in bacteria, such as Streptococcus pneumoniae and Streptococcus pyogenes. However, little is known about the genomic distribution of ncRNAs and RNA families in S. agalactiae. Results Comparative genome analysis of 27 S. agalactiae strains showed more than 5 thousand genomic regions identified and classified as Core, Exclusive, and Shared genome sequences. We identified 27 to 89 RNA families per genome distributed over these regions, from these, 25 were in Core regions while Shared and Exclusive regions showed variations amongst strains. We propose that the amount and type of ncRNA present in each genome can provide a pattern to contribute in the identification of the clonal types. Conclusions The identification of RNA families provides an insight over ncRNAs, sRNAs and ribozymes function, that can be further explored as targets for antibiotic development or studied in gene regulation of cellular processes. RNA families could be considered as markers to determine infection capabilities of different strains. Lastly, pan-genome analysis of GBS including the full range of functional transcripts provides a broader approach in the understanding of this pathogen. Electronic supplementary material The online version of this article (10.1186/s12864-018-4951-z) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Ivan Rodrigo Wolf
- Departamento de Biologia Geral, Centro de Ciências Biológicas, Universidade Estadual de Londrina, Londrina, Paraná, Brazil.
| | - Alexandre Rossi Paschoal
- Universidade Tecnológica Federal do Paraná, Campus Cornélio Procópio, Cornélio Procópio, Paraná, Brazil.
| | - Cecilia Quiroga
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Buenos Aires, Argentina
| | - Douglas Silva Domingues
- Departamento de Botânica, Instituto de Biociências de Rio Claro, Universidade Estadual Paulista Júlio de Mesquita Filho, Rio Claro, São Paulo, Brazil
| | - Rogério Fernandes de Souza
- Departamento de Biologia Geral, Centro de Ciências Biológicas, Universidade Estadual de Londrina, Londrina, Paraná, Brazil
| | | | - Laurival Antonio Vilas-Boas
- Departamento de Biologia Geral, Centro de Ciências Biológicas, Universidade Estadual de Londrina, Londrina, Paraná, Brazil
| |
Collapse
|
11
|
Quiroga C, Nastro M, Di Conza J. Current scenario of plasmid-mediated colistin resistance in Latin America. Rev Argent Microbiol 2018; 51:93-100. [PMID: 29945744 DOI: 10.1016/j.ram.2018.05.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 04/15/2018] [Accepted: 05/09/2018] [Indexed: 11/30/2022] Open
Abstract
Colistin resistance can occur by chromosomal mutations and by acquisition of plasmid-carrying determinants, mainly mcr-1. In the recent years, we have observed the outburst of this resistance gene in our region. Due to the risk of the rapid dissemination of mcr-1, this finding has worried and alerted different actors from the health field and has become one of the most prolific topics. Our review compiles available reports of well-documented mcr-1-positive strains of Enterobacteriaceae, obtained from different samples in Argentina and other countries of Latin America. Furthermore, it addresses the association of mcr-1 with ESBL resistance markers and outlines the platforms involved in their dissemination.
Collapse
Affiliation(s)
- Cecilia Quiroga
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPAM), Facultad de Medicina, Paraguay 2155, C1121ABG, Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290 (1425), Ciudad Autónoma de Buenos Aires, Argentina
| | - Marcela Nastro
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Junín 954, C1113AAD, Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina
| | - José Di Conza
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Junín 954, C1113AAD, Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290 (1425), Ciudad Autónoma de Buenos Aires, Argentina.
| |
Collapse
|
12
|
Abele D, Vazquez S, Buma AGJ, Hernandez E, Quiroga C, Held C, Frickenhaus S, Harms L, Lopez JL, Helmke E, Mac Cormack WP. Pelagic and benthic communities of the Antarctic ecosystem of Potter Cove: Genomics and ecological implications. Mar Genomics 2017; 33:1-11. [PMID: 28479280 DOI: 10.1016/j.margen.2017.05.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 05/02/2017] [Accepted: 05/02/2017] [Indexed: 12/12/2022]
Abstract
Molecular technologies are more frequently applied in Antarctic ecosystem research and the growing amount of sequence-based information available in databases adds a new dimension to understanding the response of Antarctic organisms and communities to environmental change. We apply molecular techniques, including fingerprinting, and amplicon and metagenome sequencing, to understand biodiversity and phylogeography to resolve adaptive processes in an Antarctic coastal ecosystem from microbial to macrobenthic organisms and communities. Interpretation of the molecular data is not only achieved by their combination with classical methods (pigment analyses or microscopy), but furthermore by combining molecular with environmental data (e.g., sediment characteristics, biogeochemistry or oceanography) in space and over time. The studies form part of a long-term ecosystem investigation in Potter Cove on King-George Island, Antarctica, in which we follow the effects of rapid retreat of the local glacier on the cove ecosystem. We formulate and encourage new approaches to integrate molecular tools into Antarctic ecosystem research, environmental conservation actions, and polar ocean observatories.
Collapse
Affiliation(s)
- D Abele
- Dept. Biosciences, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27470 Bremerhaven, Germany.
| | - S Vazquez
- Universidad de Buenos Aires, CONICET, Instituto de Nanobiotecnología (NANOBIOTEC), Junín 954, 1113 Buenos Aires, Argentina
| | - A G J Buma
- Dept. Ocean Ecosystems, Energy and Sustainability Research Groningen, University of Groningen, Nijenborgh 7, 9747 AG Groningen, The Netherlands
| | - E Hernandez
- Instituto Antártico Argentino (IAA), 25 de Mayo 1143, 1650 San Martin, Buenos Aires, Argentina
| | - C Quiroga
- Universidad de Buenos Aires, CONICET, Instituto de Medicina y Parasitologia Medica (IMPaM), Paraguay 2155 P.12, 1121 Buenos Aires, Argentina
| | - C Held
- Dept. Biosciences, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27470 Bremerhaven, Germany
| | - S Frickenhaus
- Dept. Biosciences, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27470 Bremerhaven, Germany
| | - L Harms
- Dept. Biosciences, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27470 Bremerhaven, Germany
| | - J L Lopez
- Universidad de Buenos Aires, Catedra de Virologia, Junín 954, 1113 Buenos Aires, Argentina
| | - E Helmke
- Dept. Biosciences, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27470 Bremerhaven, Germany
| | - W P Mac Cormack
- Instituto Antártico Argentino (IAA), 25 de Mayo 1143, 1650 San Martin, Buenos Aires, Argentina
| |
Collapse
|
13
|
Bobadilla E, Quiroga C. Descriptive study of the first consultations in a mental health unit. Eur Psychiatry 2017. [DOI: 10.1016/j.eurpsy.2017.01.1238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The profile of patients cared for in a mental health unit is diverse. However, there are recurring features. In this study, a total of 100 patients were evaluated for 2 months. This study describes the socio-demographic aspects, the reason for the consultation, the psychiatric history, the diagnoses, the previous treatments and the presence of previous admissions in a psychiatric hospitalization unit. Knowledge of the patient profile will improve service delivery.Disclosure of interestThe authors have not supplied their declaration of competing interest.
Collapse
|
14
|
Quiroga C. [Omic technologies: Current situation and future challenges]. Rev Argent Microbiol 2017; 48:265-266. [PMID: 28038716 DOI: 10.1016/j.ram.2016.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 12/07/2016] [Indexed: 11/16/2022] Open
Affiliation(s)
- Cecilia Quiroga
- Editora asociada de Revista Argentina de Microbiología, Ciudad Autónoma de Buenos Aires, Argentina.
| |
Collapse
|
15
|
Montaña S, Schramm STJ, Traglia GM, Chiem K, Parmeciano Di Noto G, Almuzara M, Barberis C, Vay C, Quiroga C, Tolmasky ME, Iriarte A, Ramírez MS. The Genetic Analysis of an Acinetobacter johnsonii Clinical Strain Evidenced the Presence of Horizontal Genetic Transfer. PLoS One 2016; 11:e0161528. [PMID: 27548264 PMCID: PMC4993456 DOI: 10.1371/journal.pone.0161528] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 08/08/2016] [Indexed: 02/08/2023] Open
Abstract
Acinetobacter johnsonii rarely causes human infections. While most A. johnsonii isolates are susceptible to virtually all antibiotics, strains harboring a variety of β-lactamases have recently been described. An A. johnsonii Aj2199 clinical strain recovered from a hospital in Buenos Aires produces PER-2 and OXA-58. We decided to delve into its genome by obtaining the whole genome sequence of the Aj2199 strain. Genome comparison studies on Aj2199 revealed 240 unique genes and a close relation to strain WJ10621, isolated from the urine of a patient in China. Genomic analysis showed evidence of horizontal genetic transfer (HGT) events. Forty-five insertion sequences and two intact prophages were found in addition to several resistance determinants such as blaPER-2, blaOXA-58, blaTEM-1, strA, strB, ereA, sul1, aacC2 and a new variant of blaOXA-211, called blaOXA-498. In particular, blaPER-2 and blaTEM-1 are present within the typical contexts previously described in the Enterobacteriaceae family. These results suggest that A. johnsonii actively acquires exogenous DNA from other bacterial species and concomitantly becomes a reservoir of resistance genes.
Collapse
Affiliation(s)
- Sabrina Montaña
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| | - Sareda T. J. Schramm
- Department of Biological Science, California State University Fullerton, Fullerton, CA, United States of America
| | - German Matías Traglia
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| | - Kevin Chiem
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Buenos Aires, Argentina
- Department of Biological Science, California State University Fullerton, Fullerton, CA, United States of America
| | - Gisela Parmeciano Di Noto
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| | - Marisa Almuzara
- Laboratorio de Bacteriología Clínica, Departamento de Bioquímica Clínica, Hospital de Clínicas José de San Martín, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Claudia Barberis
- Laboratorio de Bacteriología Clínica, Departamento de Bioquímica Clínica, Hospital de Clínicas José de San Martín, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Carlos Vay
- Laboratorio de Bacteriología Clínica, Departamento de Bioquímica Clínica, Hospital de Clínicas José de San Martín, Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - Cecilia Quiroga
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Buenos Aires, Argentina
| | - Marcelo E. Tolmasky
- Department of Biological Science, California State University Fullerton, Fullerton, CA, United States of America
| | - Andrés Iriarte
- Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, UdelaR, Montevideo, Uruguay
| | - María Soledad Ramírez
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM, UBA-CONICET), Buenos Aires, Argentina
- Department of Biological Science, California State University Fullerton, Fullerton, CA, United States of America
- * E-mail:
| |
Collapse
|
16
|
Parmeciano Di Noto G, Jara E, Iriarte A, Centrón D, Quiroga C. Genome analysis of a clinical isolate of Shewanella sp. uncovered an active hybrid integrative and conjugative element carrying an integron platform inserted in a novel genomic locus. Microbiology (Reading) 2016; 162:1335-1345. [PMID: 27215217 DOI: 10.1099/mic.0.000310] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Shewanella spp. are currently considered to be emerging pathogens that can code for a blaOXA carbapenemase in their chromosome. Complete genome analysis of the clinical isolate Shewanella sp. Sh95 revealed that this strain is a novel species, which shares a lineage with marine isolates. Characterization of its resistome showed that it codes for genes drfA15, qacH and blaOXA-48. We propose that Shewanella sp. Sh95 acts as reservoir of blaOXA-48. Moreover, analysis of mobilome showed that it contains a novel integrative and conjugative element (ICE), named ICESh95. Comparative analysis between the close relatives ICESpuPO1 from Shewanella sp. W3-18-1 and ICE SXTMO10 from Vibrio cholerae showed that ICESh95 encompassed two new regions, a type III restriction modification system and a multidrug resistance integron. The integron platform contained a novel arrangement formed by gene cassettes drfA15 and qacH, and a class C-attC group II intron. Furthermore, insertion of ICESh95 occurred at a unique target site, which correlated with the presence of a different xis/int module. Mobility of ICESh95 was assessed and demonstrated its ability to self-transfer with high efficiency to different species of bacteria. Our results show that ICESh95 is a self-transmissible, mobile element, which can contribute to the dissemination of antimicrobial resistance; this is clearly a threat when natural bacteria from water ecosystems, such as Shewanella, act as vectors in its propagation.
Collapse
Affiliation(s)
- Gisela Parmeciano Di Noto
- Instituto de Investigaciones en Microbiología y Parasitología Médica, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET), Facultad de Medicina, Buenos Aires, Argentina
| | - Eugenio Jara
- Laboratorio de Organización y Evolución del Genoma, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Andrés Iriarte
- Departamento de Desarrollo Biotecnológico, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.,Departamento de Bioquímica y Genómica Microbianas & Departamento de Genómica, IIBCE, Montevideo, Uruguay
| | - Daniela Centrón
- Instituto de Investigaciones en Microbiología y Parasitología Médica, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET), Facultad de Medicina, Buenos Aires, Argentina
| | - Cecilia Quiroga
- Instituto de Investigaciones en Microbiología y Parasitología Médica, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET), Facultad de Medicina, Buenos Aires, Argentina
| |
Collapse
|
17
|
Monat C, Quiroga C, Laroche-Johnston F, Cousineau B. The Ll.LtrB intron from Lactococcus lactis excises as circles in vivo: insights into the group II intron circularization pathway. RNA 2015; 21:1286-1293. [PMID: 25956521 PMCID: PMC4478347 DOI: 10.1261/rna.046367.114] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 03/31/2015] [Indexed: 06/04/2023]
Abstract
Group II introns are large ribozymes that require the assistance of intron-encoded or free-standing maturases to splice from their pre-mRNAs in vivo. They mainly splice through the classical branching pathway, being released as RNA lariats. However, group II introns can also splice through secondary pathways like hydrolysis and circularization leading to the release of linear and circular introns, respectively. Here, we assessed in vivo splicing of various constructs of the Ll.LtrB group II intron from the Gram-positive bacterium Lactococcus lactis. The study of excised intron junctions revealed, in addition to branched intron lariats, the presence of perfect end-to-end intron circles and alternatively circularized introns. Removal of the branch point A residue prevented Ll.LtrB excision through the branching pathway but did not hinder intron circle formation. Complete intron RNA circles were found associated with the intron-encoded protein LtrA forming nevertheless inactive RNPs. Traces of double-stranded head-to-tail intron DNA junctions were also detected in L. lactis RNA and nucleic acid extracts. Some intron circles and alternatively circularized introns harbored variable number of non-encoded nucleotides at their splice junction. The presence of mRNA fragments at the splice junction of some intron RNA circles provides insights into the group II intron circularization pathway in bacteria.
Collapse
Affiliation(s)
- Caroline Monat
- Department of Microbiology and Immunology, Microbiome and Disease Tolerance Centre (MDTC), McGill University, Montréal, Québec, Canada H3A 2B4
| | - Cecilia Quiroga
- Department of Microbiology and Immunology, Microbiome and Disease Tolerance Centre (MDTC), McGill University, Montréal, Québec, Canada H3A 2B4
| | - Felix Laroche-Johnston
- Department of Microbiology and Immunology, Microbiome and Disease Tolerance Centre (MDTC), McGill University, Montréal, Québec, Canada H3A 2B4
| | - Benoit Cousineau
- Department of Microbiology and Immunology, Microbiome and Disease Tolerance Centre (MDTC), McGill University, Montréal, Québec, Canada H3A 2B4
| |
Collapse
|
18
|
Guo Y, Quiroga C, Chen Q, McAnulty MJ, Benedik MJ, Wood TK, Wang X. RalR (a DNase) and RalA (a small RNA) form a type I toxin-antitoxin system in Escherichia coli. Nucleic Acids Res 2014; 42:6448-62. [PMID: 24748661 PMCID: PMC4041452 DOI: 10.1093/nar/gku279] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
For toxin/antitoxin (TA) systems, no toxin has been identified that functions by cleaving DNA. Here, we demonstrate that RalR and RalA of the cryptic prophage rac form a type I TA pair in which the antitoxin RNA is a trans-encoded small RNA with 16 nucleotides of complementarity to the toxin mRNA. We suggest the newly discovered antitoxin gene be named ralA for RalR antitoxin. Toxin RalR functions as a non-specific endonuclease that cleaves methylated and unmethylated DNA. The RNA chaperone Hfq is required for RalA antitoxin activity and appears to stabilize RalA. Also, RalR/RalA is beneficial to the Escherichia coli host for responding to the antibiotic fosfomycin. Hence, our results indicate that cryptic prophage genes can be functionally divergent from their active phage counterparts after integration into the host genome.
Collapse
Affiliation(s)
- Yunxue Guo
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China
| | - Cecilia Quiroga
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802-4400, USA
| | - Qin Chen
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802-4400, USA
| | - Michael J McAnulty
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802-4400, USA
| | - Michael J Benedik
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA 16802-4400, USA
| | - Thomas K Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802-4400, USA Department of Biology, Texas A & M University, College Station, TX 77843-3258, USA
| | - Xiaoxue Wang
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China
| |
Collapse
|
19
|
Di Conza JA, Quiroga C. [Ethical responsibilities on the publication of scientific articles]. Rev Argent Microbiol 2014; 45:219-21. [PMID: 24401774 DOI: 10.1016/s0325-7541(13)70027-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- José A Di Conza
- Secretario de Redacción de la Revista Argentina de Microbiología, Ciudad Autónoma de Buenos Aires, Argentina.
| | - Cecilia Quiroga
- Editora Asociada de la Revista Argentina de Microbiología, Ciudad Autónoma de Buenos Aires, Argentina
| |
Collapse
|
20
|
Burghi G, Verga F, Acevedo M, Martinez V, Carrasco V, Quiroga C, Pittini G, Fariña G, Godino M, Mareque S, Alzugaray P, Bagnulo H, Azoulay E. Prevalence, risk factors and consequences of intra-team conflicts in the ICU. Crit Care 2014. [PMCID: PMC4068170 DOI: 10.1186/cc13211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
21
|
Quiroga C. Partial Persistence of the Ductus Arteriosus. Acta Radiol 2013. [DOI: 10.1177/028418516105500203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
22
|
Quiroga MP, Arduino SM, Merkier AK, Quiroga C, Petroni A, Roy PH, Centrón D. “Distribution and functional identification of complex class 1 integrons”. Infection, Genetics and Evolution 2013; 19:88-96. [DOI: 10.1016/j.meegid.2013.06.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 06/25/2013] [Accepted: 06/28/2013] [Indexed: 10/26/2022]
|
23
|
Bravo-Sagua R, E. Rodriguez A, Kuzmicic J, Gutierrez T, Lopez-Crisosto C, Quiroga C, Diaz-Elizondo J, Chiong M, G. Gillette T, A. Rothermel B, Lavandero S. Cell Death and Survival Through the Endoplasmic Reticulum- Mitochondrial Axis. Curr Mol Med 2013; 13:317-29. [DOI: 10.2174/156652413804810781] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 10/23/2012] [Accepted: 10/25/2012] [Indexed: 11/22/2022]
|
24
|
Bravo-Sagua R, Rodriguez A, Kuzmicic J, Gutierrez T, Lopez-Crisosto C, Quiroga C, Diaz-Elizondo J, Chiong M, Gillette T, Rothermel B, Lavandero S. Cell Death and Survival Through the Endoplasmic Reticulum- Mitochondrial Axis. Curr Mol Med 2012. [DOI: 10.2174/1566524011313020008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
25
|
Burghi G, LAmbert J, Chaize M, Quiroga C, Pittini G, Cancela M, Bagnulo H, Chevret S, Azoulay E. Prevalence, risk factors and impact of severe burnout syndrome in 12 Uruguayan ICUs. Crit Care 2012. [PMCID: PMC3363909 DOI: 10.1186/cc11098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
26
|
Knowlton N, Wages JA, Centola MB, Giles J, Bathon J, Quiroga C, Alaupovic P. Apolipoprotein B-containing lipoprotein subclasses as risk factors for cardiovascular disease in patients with rheumatoid arthritis. Arthritis Care Res (Hoboken) 2012; 64:993-1000. [PMID: 22337612 DOI: 10.1002/acr.21646] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The purpose of this study was to explore whether nontraditional risk factors, such as apolipoprotein C-III (Apo C-III) and its corresponding Apo B lipoprotein (Lp) subclasses, contribute to the risk of cardiovascular disease in rheumatoid arthritis (RA) patients. METHODS Apolipoprotein and lipoproteins were measured in 152 RA patients by immunoturbidimetric procedures, electroimmunoassay, and immunoprecipitation. Patients had a coronary artery calcium (CAC) score assessed at baseline and at year 3. Differences in the CAC scores between baseline and year 3 were calculated and dichotomized at 0, where patients with a difference score >0 were denoted as progressors and the rest were denoted as nonprogressors. Differences between means were tested with a 2-sided independent Student's t-test with Satterthwaite's adjustment. Proportion differences were tested with a chi-square test. Multiple logistic regression was performed to assess the relationship between apolipoprotein and lipoprotein levels and the dichotomized CAC score. RESULTS Progressors accounted for almost 60% of the cohort. Progressors had significantly higher levels of triglycerides, very low-density lipoprotein (VLDL) cholesterol, total cholesterol/high-density lipoprotein (HDL), triglycerides/HDL, Apo B, LpA-II:B:C:D:E, LpB:C, Apo B/Apo A-I, Apo C-III, and Apo C-III-heparin precipitate than the nonprogressors. After adjusting for age, sex, statin use (yes/no), and hypertension (yes/no), significant risk factors of progressors were total cholesterol, triglycerides, VLDL cholesterol, LDL cholesterol, Apo B, LpB:C, Apo C-III, and Apo B/Apo A-I. CONCLUSION Apo C-III-containing Apo B lipoprotein subclasses were found to be significantly elevated in progressors compared to nonprogressors. Many of these same lipoproteins were found to be associated with an increase in CAC scores among progressors. These lipoproteins may be considered new risk factors for progression of atherosclerosis in RA patients.
Collapse
Affiliation(s)
- N Knowlton
- Oklahoma Medical Research Foundation, Oklahoma City, OK, USA.
| | | | | | | | | | | | | |
Collapse
|
27
|
Quiroga C, Kronstad L, Ritlop C, Filion A, Cousineau B. Contribution of base-pairing interactions between group II intron fragments during trans-splicing in vivo. RNA 2011; 17:2212-2221. [PMID: 22033330 PMCID: PMC3222133 DOI: 10.1261/rna.028886.111] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Accepted: 09/08/2011] [Indexed: 05/31/2023]
Abstract
Group II introns are mobile genetic elements that self-splice from pre-mRNA transcripts. Some fragmented group II introns found in chloroplastic and mitochondrial genomes are able to assemble and splice in trans. The Ll.LtrB group II intron from the Gram-positive bacterium Lactococcus lactis was shown to splice in trans when fragmented at various locations throughout its structure. Here we used Ll.LtrB to assess the contribution of base-pairing interactions between intron fragments during trans-splicing in vivo. By comparing closely located fragmentation sites, we show that Ll.LtrB trans-splices more efficiently when base-pairing interactions can occur between the two intron fragments. Disruptions and stepwise restorations of specific base-pairing interactions between intron fragments resulted respectively in significant reductions and recoveries of the Ll.LtrB trans-splicing efficiency. Finally, although we confirm that LtrA is an important co-factor for trans-splicing, its overexpression cannot compensate for the reduction in trans-splicing efficiency when the potential base-pairing interactions between intron fragments are disrupted. These findings demonstrate the important contribution of base-pairing interactions for the assembly of group II intron fragments during trans-splicing and rationalizes why such interactions were evolutionarily conserved in natural trans-splicing group II introns.
Collapse
Affiliation(s)
- Cecilia Quiroga
- Department of Microbiology and Immunology, McGill University, Montréal, Québec, Canada H3A 2B4
| | - Lisa Kronstad
- Department of Microbiology and Immunology, McGill University, Montréal, Québec, Canada H3A 2B4
| | - Christine Ritlop
- Department of Microbiology and Immunology, McGill University, Montréal, Québec, Canada H3A 2B4
| | - Audrey Filion
- Department of Microbiology and Immunology, McGill University, Montréal, Québec, Canada H3A 2B4
| | - Benoit Cousineau
- Department of Microbiology and Immunology, McGill University, Montréal, Québec, Canada H3A 2B4
| |
Collapse
|
28
|
Chiong M, Parra V, Eisner V, Ibarra C, Maldonado C, Criollo A, Bravo R, Quiroga C, Contreras A, Vicencio JM, Cea P, Bucarey JL, Molgó J, Jaimovich E, Hidalgo C, Kroemer G, Lavandero S. Parallel activation of Ca(2+)-induced survival and death pathways in cardiomyocytes by sorbitol-induced hyperosmotic stress. Apoptosis 2010; 15:887-903. [PMID: 20454859 DOI: 10.1007/s10495-010-0505-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Hyperosmotic stress promotes rapid and pronounced apoptosis in cultured cardiomyocytes. Here, we investigated if Ca(2+) signals contribute to this response. Exposure of cardiomyocytes to sorbitol [600 mosmol (kg water)(-1)] elicited large and oscillatory intracellular Ca(2+) concentration increases. These Ca(2+) signals were inhibited by nifedipine, Cd(2+), U73122, xestospongin C and ryanodine, suggesting contributions from both Ca(2+) influx through voltage dependent L-type Ca(2+) channels plus Ca(2+) release from intracellular stores mediated by IP(3) receptors and ryanodine receptors. Hyperosmotic stress also increased mitochondrial Ca(2+) levels, promoted mitochondrial depolarization, reduced intracellular ATP content, and activated the transcriptional factor cyclic AMP responsive element binding protein (CREB), determined by increased CREB phosphorylation and electrophoretic mobility shift assays. Incubation with 1 mM EGTA to decrease extracellular [Ca(2+)] prevented cardiomyocyte apoptosis induced by hyperosmotic stress, while overexpression of an adenoviral dominant negative form of CREB abolished the cardioprotection provided by 1 mM EGTA. These results suggest that hyperosmotic stress induced by sorbitol, by increasing Ca(2+) influx and raising intracellular Ca(2+) concentration, activates Ca(2+) release from stores and causes cell death through mitochondrial function collapse. In addition, the present results suggest that the Ca(2+) increase induced by hyperosmotic stress promotes cell survival by recruiting CREB-mediated signaling. Thus, the fate of cardiomyocytes under hyperosmotic stress will depend on the balance between Ca(2+)-induced survival and death pathways.
Collapse
Affiliation(s)
- M Chiong
- Centro FONDAP Estudios Moleculares de la Célula, Universidad de Chile, Santiago, Chile
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Abstract
Integrons are genetic elements that incorporate mobile gene cassettes by site-specific recombination and express them as an operon from a promoter (Pc) located upstream of the cassette insertion site. Most gene cassettes found in integrons contain only one gene followed by an attC recombination site. We have recently shown that a specific lineage of group IIC introns, named group IIC-attC introns, inserts into the bottom strand sequence of attC sites. Here, we show that S.ma.I2, a group IIC-attC intron inserted in an integron cassette array of Serratia marcescens, impedes transcription from Pc while allowing expression of the following antibiotic resistance cassette using an internal outward-oriented promoter (Pout). Bioinformatic analyses indicate that one or two putative Pout, which have sequence similarities with the Escherichia coli consensus promoters, are conserved in most group IIC-attC intron sequences. We show that Pout with different versions of the −35 and −10 sequences are functionally active in expressing a promoterless chloramphenicol acetyltransferase (cat) reporter gene in E. coli. Pout in group IIC-attC introns may therefore play a role in the expression of one or more gene cassettes whose transcription from Pc would otherwise be impeded by insertion of the intron.
Collapse
Affiliation(s)
- Grégory Léon
- Centre de Recherche en Infectiologie, Centre Hospitalier Universitaire de Québec, Québec, Canada
| | | | | | | |
Collapse
|
30
|
Quiroga C, Centrón D. Using Genomic Data to Determine the Diversity and Distribution of Target Site Motifs Recognized by Class C-attC Group II Introns. J Mol Evol 2009; 68:539-49. [DOI: 10.1007/s00239-009-9228-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Revised: 03/27/2009] [Accepted: 03/31/2009] [Indexed: 01/31/2023]
|
31
|
Abstract
We previously found the class C S.ma.I2 group II (GII) intron in Serratia marcescens SCH909 inserted into the variable region of a class 1 integron within the attC site of the ant(2'')-Ia gene cassette. Here, we demonstrate that this ant(2'')-Ia : : S.ma.I2 gene cassette is a recombinationally active element despite the presence of the S.ma.I2 intron. In addition, S.ma.I2 is an active GII intron capable of performing self-splicing and invading specific target sites. Intron homing to a DNA target site is RecA-independent and recognizes the intron binding site (IBS)1 and IBS3 regions, formed by the 5' TTGTT 3' consensus sequence located within the inverse core site of attC integrons. Our results also indicate that the process for S.ma.I2 intron mobilization involves a secondary structure provided by the folding of the complete attC site. Moreover, phylogenetic analysis of the class C GII introns showed a clear divergent clade formed by introns that insert within specific sites usually associated with lateral gene transfer.
Collapse
Affiliation(s)
- Cecilia Quiroga
- Centre de Recherche en Infectiologie, Université Laval, Québec, Canada.,Departamento de Microbiología, Inmunología y Parasitología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Paul H Roy
- Département de Biochimie et de Microbiologie, Université Laval, Québec, Canada.,Centre de Recherche en Infectiologie, Université Laval, Québec, Canada
| | - Daniela Centrón
- Departamento de Microbiología, Inmunología y Parasitología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| |
Collapse
|
32
|
Merkier AK, Catalano M, Ramírez MS, Quiroga C, Orman B, Ratier L, Famiglietti A, Vay C, Di Martino A, Kaufman S, Centrón D. Polyclonal spread of bla(OXA-23) and bla(OXA-58) in Acinetobacter baumannii isolates from Argentina. J Infect Dev Ctries 2008; 2:235-40. [PMID: 19738357 DOI: 10.3855/jidc.269] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2008] [Indexed: 10/31/2022] Open
Abstract
BACKGROUND In order to study the enzymatic carbapenem resistance mechanisms in Acinetobacter baumannii isolates from Argentina, we performed molecular characterization on 41 epidemiologically unrelated strains isolated from 1995 to 2006 with diminished susceptibilities to imipenem and meropenem. METHODOLOGY Acinetobacter baumannii isolates were identified with the ARDRA technique. The total genomic DNA was used to detect each carbapenem beta-lactamase gene described so far in this species and those insertion sequences usually associated to carbapenem beta-lactamase genes (ISAba1, 2, 3, 4 and IS18) by the PCR technique with specific primers. RESULTS 26 out of 41 Acinetobacter baumannii isolates with diminished susceptibilities to carbapenems harboured the bla(OXA-23) gene. The bla(OXA-58) was detected in 13 out of 41 isolates. ISAba1 was always located upstream bla(OXA-23). All isolates containing the bla(OXA-58) gene showed ISAba3 downstream of the carbapenemase, while 4 isolates had a second copy of the ISAba3 upstream of the gene. CONCLUSION Enzymatic carbapenem resistance in Acinetobacter baumannii was found in 88% of 41 non-epidemiologically-related strains mediated by the polyclonal spread of the bla(OXA-23) and bla(OXA-58) genes. The genetic structures surrounding the oxacillinase genes found in our bacterial isolates revealed a particular epidemiology in our geographical region. This data suggests the need of local molecular surveillance to help control multirresistance Acinetobacter baumannii infections.
Collapse
Affiliation(s)
- Andrea Karina Merkier
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2155. Buenos Aires, Argentina
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Ramírez MS, Quiroga C, Centrón D. Novel rearrangement of a class 2 integron in two non-epidemiologically related isolates of Acinetobacter baumannii. Antimicrob Agents Chemother 2006; 49:5179-81. [PMID: 16304199 PMCID: PMC1315932 DOI: 10.1128/aac.49.12.5179-5181.2005] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Tn7::In2-8 contains sat2-aadB-catB2(deltaattC)-dfrA1-sat2-aadA1-orfX in the variable region of a class 2 integron embedded in the Tn7-like transposon. This novel transposon was inserted in its preferred site downstream of the glms gene in Acinetobacter baumannii. Acquisition of the pseudocassette catB2 could have arisen by a secondary-site integrase-mediated intermolecular recombination event.
Collapse
Affiliation(s)
- María Soledad Ramírez
- Departamento de Microbiología, Parasitología e Immunología, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, P-12, Capital Federal, Argentina
| | | | | |
Collapse
|
34
|
Gosmanova A, Alaupovic P, Quiroga C, Lyons TJ. 178 CHARACTERIZATION OF METABOLIC SYNDROME BY APOLIPOPROTEIN-DEFINED LIPOPROTEIN SUBCLASSES. J Investig Med 2006. [DOI: 10.2310/6650.2005.x0008.177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
35
|
Abstract
The purpose of this study was to report on the long-term outcomes of transmetatarsal amputations secondary to sequelae of diabetes mellitus. We abstracted data from 35 diabetic patients receiving a transmetatarsal amputation over a 6-month period in 1992. Patients were followed for a mean 15.1 +/- 10.1 months. The results indicated that the most predictive factor determining higher level amputation (transfemoral or transtibial) appeared to be the actual indication for surgery (90.0% ischemia versus 4.0% infection, chi 2 = 21.7, odds ratio = 220, 95% confidence interval = 12.5-3885.0, p < 0.05). Those with a diagnosis of infection without underlying critical ischemia were significantly more likely to heal at the level of the foot. While all patients presenting for care had dramatically impaired nutritional values and elevated glucose, albumin was significantly lower in subjects receiving a transfemoral or transtibial revision. High-level amputees were also significantly less likely to have been prescribed depth-inlay shoe gear prior to their amputation (48.0% vs. 10.0%, chi 2 = 4.4, odds ratio = 8.3, 95% confidence interval = 1.0-75.7, p < 0.05). Those with a diagnosis of infection without underlying critical ischemia were significantly more likely to heal at the level of the foot. Though revision rates are high, the success rates are also high if that is defined as retaining the foot and providing a prosthesis-free normal gait.
Collapse
Affiliation(s)
- J Hosch
- Department of Orthopaedics, University of Texas Health Science Center, San Antonio 78284-7776, USA
| | | | | | | | | | | |
Collapse
|
36
|
Imperial S, Quiroga C, Busquets M, Cortés A. Heterogeneity of chicken liver cytosolic aspartate aminotransferase. Biochim Biophys Acta 1991; 1077:72-8. [PMID: 2009296 DOI: 10.1016/0167-4838(91)90527-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The isolated native molecular forms of chicken liver cytosolic aspartate aminotransferase give rise to two kinds of generation processes: (a) on storage, molecular forms are transformed into a series of variants with increasing anodic mobilities; and (b) addition of thiol reagents not only avoids the process, but causes the partial transformation of minor subforms into variants with higher isoelectric point values. In both cases the mobilities of each generated variant coincide with that of the corresponding native molecular form. The variants generated either by storage or in the presence of thiol reagents were separated by chromatofocusing. Several comparative studies have demonstrated the structural and functional identity between native molecular forms and 'in vitro' active generated variants of the enzyme. The results obtained suggest that native minor subforms arise from the major alpha form due to oxidation process and might represent intermediate species in the intracellular cytosolic aspartate aminotransferase turnover.
Collapse
Affiliation(s)
- S Imperial
- Departament de Bioquímica i Fisiologia, Facultat de Química, Universitat de Barcelona, Spain
| | | | | | | |
Collapse
|
37
|
Quiroga C, Imperial S, Busquets M, Cortes A. Comparison of some of the properties of the holoenzymes and apoenzymes of the molecular forms of chicken liver cytoplasmic aspartate aminotransferase. Biochem Soc Trans 1991; 19:74S. [PMID: 2037203 DOI: 10.1042/bst019074s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- C Quiroga
- Departament de Bioquímica i Fisiologia, Fac. Quimica, Universitat de Barcelona, Spain
| | | | | | | |
Collapse
|
38
|
Imperial S, Quiroga C, Busquets M, Cortés A, Bozal J. Generation process of cytosolic aspartate aminotransferase molecular forms by several treatments. J Protein Chem 1988; 7:129-39. [PMID: 3255365 DOI: 10.1007/bf01025242] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Alpha-, beta-, and gamma-forms of chicken liver cytosolic aspartate aminotransferase generate variants on storage (4 degrees C, 25 days). The variants developed from each isolated form appeared as evenly spaced bands with increasing anodic mobilities after polyacrylamide gel electrophoresis (PAGE), pH 8.8, and specific staining. Their mobilities coincided with those of the more negatively charged forms present in fresh tissue. Development of faster-running variants on storage was avoided by addition of thiol reagents to the freshly isolated forms. In their presence, beta- and gamma-forms were partially transformed into one and two variants with lower anodic mobilities analogous to those of native alpha- and beta-forms. Short pH and heat treatments did not modify the electrophoretic patterns of the alpha-, beta-, and gamma-forms, but the incubation with 5 mM L-ascorbic acid (37 degrees C, 7 h) produced more anodic active bands. The formation of these variants was inhibited by the presence, in the incubation mixture, of superoxide dismutase and catalase. The kinetic parameters of the forms submitted to the different treatments were similar to those of the freshly isolated subforms. The results obtained suggest that minor subforms of the enzyme could be generated in vivo by a mechanism in which the oxidation of particular amino acid groups is involved.
Collapse
Affiliation(s)
- S Imperial
- Departamento de Bioquímica y Fisiología, Facultad de Química, Barcelona, Spain
| | | | | | | | | |
Collapse
|
39
|
Quiroga C, Imperial S, Busquets M, Cortés A, Bozal J. A Comparison of Different Stains Used for the Detection of Aspartate Akinotsansferase in Biological Samples. ANAL LETT 1987. [DOI: 10.1080/00032718708067990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
40
|
Quiroga C, Busquets M, Cortés A, Bozal J. Separation and kinetic properties of the molecular forms of chicken liver cytoplasmic aspartate aminotransferase. Int J Biochem 1985; 17:1185-90. [PMID: 4076520 DOI: 10.1016/0020-711x(85)90008-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A method is proposed for the separation of the five molecular forms, alpha, beta, gamma, delta and epsilon, of chicken liver cytoplasmic aspartate aminotransferase free from lactate dehydrogenase activity. These molecular forms varied in isoelectric point, but no differences were observed either in their Michaelis constants or in the degree of their inhibition by excess of 2-oxoglutarate or L-aspartate.
Collapse
|
41
|
Alday LE, Moreyra E, Quiroga C, Buonano C, Dander B. Cardiomyopathy complicated by left ventricular aneurysms in children. Br Heart J 1976; 38:162-6. [PMID: 944043 PMCID: PMC482987 DOI: 10.1136/hrt.38.2.162] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Ventricular aneurysms in children are unusual. Three patients with cardiomyopathy associated with angiographically proved left ventricular aneurysms in this age group are reported. Two of them were girls. The ages were 20 months, 7 years, and 14 years. Heart failure was present in all patients. There was radiological evidence of cardiomegaly in all three, and the electrocardiogram showed signs of necrosis in two of them. Selective left ventricular angiography disclosed generalized hypokinesis in all patients. One child had an aneurysm of the diaphragmatic wall. In another the aneurysm was localized in the muscular ventricular septum, causing severe subpulmonary stenosis by encroaching in the right ventricular outflow tract during systole. The third patient had an aneurysm of the left ventricular free wall partly encircling the left ventricle. The coronary arteries appeared normal in all cases. The clinical features of the underlying disease were not altered by the presence of the aneurysm except in the patient with the septal aneurysm and subpulmonary stenosis. In this patient the aneurysm was successfully resected.
Collapse
|
42
|
McConathy WJ, Quiroga C, Alaupovic P. Studies of the composition and structure of plasma lipoproteins. C- and N-terminal amino acids of C-I polypeptide ("R-Val") of human plasma apolipoprotein C. FEBS Lett 1972; 19:323-326. [PMID: 11946242 DOI: 10.1016/0014-5793(72)80071-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- W J. McConathy
- Cardiovascular Section, Oklahoma Medical Research Foundation and Department of Biochemistry, University of Oklahoma School of Medicine, 73104, Oklahoma City, Oklahoma, USA
| | | | | |
Collapse
|
43
|
Quiroga C, Rudhe U. Pulmonary vascular disparity in Fallot's anomaly and in simple pulmonary valve stenosis. Acta Radiol Diagn (Stockh) 1969; 8:423-32. [PMID: 5402887 DOI: 10.1177/028418516900800507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|