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Salmerón P, Buckley C, Arando M, Alcoceba E, Romero B, Clavo P, Whiley D, Serra-Pladevall J. Genome-based epidemiology and antimicrobial resistance of Neisseria gonorrhoeae in Spain: A prospective multicentre study. J Eur Acad Dermatol Venereol 2023; 37:2575-2582. [PMID: 37620291 DOI: 10.1111/jdv.19458] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 08/02/2023] [Indexed: 08/26/2023]
Abstract
BACKGROUND Whole-genome sequencing (WGS) of Neisseria gonorrhoeae isolates combined with epidemiological and phenotypic data provides better understanding of population dynamics. AIM The objective of this study was to investigate the molecular epidemiology of N. gonorrhoeae isolates from three centres in Spain and determine associations of antimicrobial resistance. METHODS Genetic characterization was performed in 170 N. gonorrhoeae isolates. WGS was carried out with the HiSeq platform (Illumina). Genome assemblies were submitted to the PubMLST Neisseria database website to determine NG-MAST, MLST and NG-STAR. Antimicrobial resistance genes and point mutations were identified with PubMLST. Phylogenomic comparison was based on whole-genome single nucleotide polymorphism analysis. RESULTS Twenty-six MLST, 49 NG-MAST and 41 NG-STAR sequence types were detected, the most prevalent being MLST-ST9363 (27.1%), NG-MAST ST569 (12.4%) and NG-STAR ST193 (14.7%). Phylogenetic analysis identified 13 clusters comprising 69% of the isolates, with two of note: one involved cefixime-resistant isolates from Barcelona presenting a mosaic penA X and belonging to MLST-ST7363 and the other involved azithromycin-resistant isolates from Mallorca that possessed the C2611T mutation in the four 23S rRNA alleles belonging to MLST-ST1901. CONCLUSION The population of N. gonorrhoeae is quite heterogeneous in Spain. Our results agree with previous data published in Europe, albeit with some differences in distribution between regions. This study describes the circulation of two gonococcal populations with a specific resistance profile and sequence type in a specific geographic area. WGS is an effective tool for epidemiological surveillance of gonococcal infection and detection of resistance genes.
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Affiliation(s)
- P Salmerón
- Microbiology Department, Vall d'Hebron Hospital Universitari, Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain
- Sexually Transmitted Infections Study Group (GEITS), Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (SEIMC), Madrid, Spain
- Department of Genetics and Microbiology, Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
| | - C Buckley
- University of Queensland, UQ Centre for Clinical Research (UQCCR), Herston, Queensland, Australia
| | - M Arando
- Sexually Transmitted Infections Study Group (GEITS), Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (SEIMC), Madrid, Spain
- Drassanes-Vall d'Hebron Sexually Transmitted Infections Unit, Vall d'Hebron Hospital Universitari, Barcelona, Spain
| | - E Alcoceba
- Microbiology Department, Son Espases Hospital Universitari, Mallorca, Spain
| | - B Romero
- Microbiology Department, Ramón y Cajal Hospital Universitario, Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain
- CIBER of Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - P Clavo
- Sandoval Health Centre, San Carlos Hospital Clínico, Instituto de Investigación Sanitaria San Carlos (IdISSC), Madrid, Spain
| | - D Whiley
- University of Queensland, UQ Centre for Clinical Research (UQCCR), Herston, Queensland, Australia
| | - J Serra-Pladevall
- Sexually Transmitted Infections Study Group (GEITS), Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica (SEIMC), Madrid, Spain
- Clinical Laboratory, Hospital Universitari de Vic, Catalonia, Spain
- Faculty of Health Sciences, Universitat de Vic - Universitat Central de Catalunya (UVIC -UCC), Vic, Spain
- Multidisciplinary Inflammation Research Group (MIRG), Fundació Institut de Recerca i Innovació en Ciències de la Vida i de la Salut de la Catalunya Central, Vic, Spain
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Albóniga OE, Moreno E, Martínez-Sanz J, Vizcarra P, Ron R, Díaz-Álvarez J, Rosas Cancio-Suarez M, Sánchez-Conde M, Galán JC, Angulo S, Moreno S, Barbas C, Serrano-Villar S. Differential abundance of lipids and metabolites related to SARS-CoV-2 infection and susceptibility. Sci Rep 2023; 13:15124. [PMID: 37704651 PMCID: PMC10500013 DOI: 10.1038/s41598-023-40999-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 08/20/2023] [Indexed: 09/15/2023] Open
Abstract
The mechanisms driving SARS-CoV-2 susceptibility remain poorly understood, especially the factors determining why unvaccinated individuals remain uninfected despite high-risk exposures. To understand lipid and metabolite profiles related with COVID-19 susceptibility and disease progression. We collected samples from an exceptional group of unvaccinated healthcare workers heavily exposed to SARS-CoV-2 but not infected ('non-susceptible') and subjects who became infected during the follow-up ('susceptible'), including non-hospitalized and hospitalized patients with different disease severity providing samples at early disease stages. Then, we analyzed their plasma metabolomic profiles using mass spectrometry coupled with liquid and gas chromatography. We show specific lipids profiles and metabolites that could explain SARS-CoV-2 susceptibility and COVID-19 severity. More importantly, non-susceptible individuals show a unique lipidomic pattern characterized by the upregulation of most lipids, especially ceramides and sphingomyelin, which could be interpreted as markers of low susceptibility to SARS-CoV-2 infection. This study strengthens the findings of other researchers about the importance of studying lipid profiles as relevant markers of SARS-CoV-2 pathogenesis.
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Affiliation(s)
- Oihane E Albóniga
- Centro de Metabolómica y Bioanálisis (CEMBIO), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, Boadilla del Monte, 28660, Madrid, Spain
| | - Elena Moreno
- Department of Infectious Diseases, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
- CIBERINFEC, Instituto de Salud Carlos III, Madrid, Spain
| | - Javier Martínez-Sanz
- Department of Infectious Diseases, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
- CIBERINFEC, Instituto de Salud Carlos III, Madrid, Spain
| | - Pilar Vizcarra
- Department of Infectious Diseases, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
- CIBERINFEC, Instituto de Salud Carlos III, Madrid, Spain
| | - Raquel Ron
- Department of Infectious Diseases, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
- CIBERINFEC, Instituto de Salud Carlos III, Madrid, Spain
| | - Jorge Díaz-Álvarez
- Department of Infectious Diseases, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
- CIBERINFEC, Instituto de Salud Carlos III, Madrid, Spain
| | - Marta Rosas Cancio-Suarez
- Department of Infectious Diseases, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
- CIBERINFEC, Instituto de Salud Carlos III, Madrid, Spain
| | - Matilde Sánchez-Conde
- Department of Infectious Diseases, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
- CIBERINFEC, Instituto de Salud Carlos III, Madrid, Spain
| | - Juan Carlos Galán
- Department of Microbiology, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
- CIBERESP, Instituto de Salud Carlos III, Madrid, Spain
| | - Santiago Angulo
- Centro de Metabolómica y Bioanálisis (CEMBIO), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, Boadilla del Monte, 28660, Madrid, Spain
| | - Santiago Moreno
- Department of Infectious Diseases, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
- CIBERINFEC, Instituto de Salud Carlos III, Madrid, Spain
| | - Coral Barbas
- Centro de Metabolómica y Bioanálisis (CEMBIO), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, Boadilla del Monte, 28660, Madrid, Spain
| | - Sergio Serrano-Villar
- Department of Infectious Diseases, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain.
- CIBERINFEC, Instituto de Salud Carlos III, Madrid, Spain.
- Department of Infectious Diseases, Hospital Universitario Ramon y Cajal, Facultad de Medicina, Universidad de Alcalá (IRYCIS), Carretera de Colmenar Viejo, Km 9.100, 28034, Madrid, Spain.
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Corma-Gómez A, Macías J, Rivero A, Rivero-Juarez A, de los Santos I, Reus-Bañuls S, Morano L, Merino D, Palacios R, Galera C, Fernández-Fuertes M, González-Serna A, de Rojas I, Ruiz A, Sáez ME, Real LM, Pineda JA. A Genome-Wide Association Study on Liver Stiffness Changes during Hepatitis C Virus Infection Cure. Diagnostics (Basel) 2021; 11:1501. [PMID: 34441435 PMCID: PMC8394459 DOI: 10.3390/diagnostics11081501] [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] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/11/2021] [Accepted: 08/16/2021] [Indexed: 02/07/2023] Open
Abstract
Liver stiffness (LS) at sustained virological response (SVR) after direct-acting antivirals (DAA)-based therapy is a predictor of liver events in hepatitis C virus (HCV)-infected patients. The study aim was to identify genetic factors associated with LS changes from the moment of starting anti-HCV therapy to SVR. This prospective study included HCV-infected patients from the GEHEP-011 cohort who achieved SVR with DAA-based therapy, with LS pre-treatment ≥ 9.5 kPa and LS measurement available at SVR. Plink and Magma software were used to carry out genome-wide single-nucleotide polymorphism (SNP)-based and gene-based association analyses, respectively. The ShinyGO application was used for exploring enrichment in Gene Ontology (GO) categories for biological processes. Overall, 242 patients were included. Median (quartile 1, quartile 3) LS values at pre-treatment and at SVR were 16.8 (12, 28) kPa and 12.0 (8.5, 19.3) kPa, respectively. Thirty-five SNPs and three genes reached suggestive association with LS changes from the moment of starting anti-HCV therapy to SVR. GO categories related to DNA packaging complex, DNA conformation change, chromosome organization and chromatin organization were significantly enriched. Our study reports possible genetic factors associated with LS changes during HCV-infection cure. In addition, our results suggest that processes related to DNA conformation are also involved in these changes.
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Affiliation(s)
- Anaïs Corma-Gómez
- Unidad Clínica de Enfermedades Infecciosas y Microbiología, Hospital de Valme, 41014 Sevilla, Spain; (A.C.-G.); (J.M.); (M.F.-F.); (A.G.-S.); (J.A.P.)
| | - Juan Macías
- Unidad Clínica de Enfermedades Infecciosas y Microbiología, Hospital de Valme, 41014 Sevilla, Spain; (A.C.-G.); (J.M.); (M.F.-F.); (A.G.-S.); (J.A.P.)
- Departamento de Medicina, Universidad de Sevilla, 41009 Sevilla, Spain
| | - Antonio Rivero
- Unidad de Enfermedades Infecciosas, Hospital Universitario Reina Sofía, Instituto Maimonides de Investigación Biomédica de Córdoba (IMIBIC), Universidad de Córdoba, 14004 Córdoba, Spain; (A.R.); (A.R.-J.)
| | - Antonio Rivero-Juarez
- Unidad de Enfermedades Infecciosas, Hospital Universitario Reina Sofía, Instituto Maimonides de Investigación Biomédica de Córdoba (IMIBIC), Universidad de Córdoba, 14004 Córdoba, Spain; (A.R.); (A.R.-J.)
| | - Ignacio de los Santos
- Unidad de Medicina Interna y Enfermedades Infecciosas, Hospital de La Princesa, 28006 Madrid, Spain;
| | - Sergio Reus-Bañuls
- Unidad de Enfermedades Infecciosas, Hospital General Universitario de Alicante, 03010 Alicante, Spain;
| | - Luis Morano
- Unidad de Patología Infecciosa, Hospital Universitario Alvaro Cunqueiro, Instituto de Investigación Sanitaria Galicia Sur (IISGS), 36312 Vigo, Spain;
| | - Dolores Merino
- Unidad de Enfermedades Infecciosas, Hospital Universitario Juan Ramón Jiménez, 21005 Huelva, Spain;
| | - Rosario Palacios
- Unidad de Enfermedades Infecciosas y Microbiología, Hospital Virgen de la Victoria, 29010 Málaga, Spain;
| | - Carlos Galera
- Unidad de Medicina Interna, Hospital Clínico Universitario Virgen de la Arrixaca, 30120 Murcia, Spain;
| | - Marta Fernández-Fuertes
- Unidad Clínica de Enfermedades Infecciosas y Microbiología, Hospital de Valme, 41014 Sevilla, Spain; (A.C.-G.); (J.M.); (M.F.-F.); (A.G.-S.); (J.A.P.)
| | - Alejandro González-Serna
- Unidad Clínica de Enfermedades Infecciosas y Microbiología, Hospital de Valme, 41014 Sevilla, Spain; (A.C.-G.); (J.M.); (M.F.-F.); (A.G.-S.); (J.A.P.)
| | - Itziar de Rojas
- Fundació ACE—Institut Català de Neurociències Aplicades, Universitat Internacional de Catalunya (UIC), 08028 Barcelona, Spain; (I.d.R.); (A.R.)
- CIBERNED Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Agustín Ruiz
- Fundació ACE—Institut Català de Neurociències Aplicades, Universitat Internacional de Catalunya (UIC), 08028 Barcelona, Spain; (I.d.R.); (A.R.)
- CIBERNED Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - María E. Sáez
- Centro Andaluz de Estudios Bioinformáticos (CAEBI, SL), 41013 Sevilla, Spain;
| | - Luis M. Real
- Unidad Clínica de Enfermedades Infecciosas y Microbiología, Hospital de Valme, 41014 Sevilla, Spain; (A.C.-G.); (J.M.); (M.F.-F.); (A.G.-S.); (J.A.P.)
- Departamento de Especialidades Quirúrgicas, Bioquímica e Inmunología, Universidad de Málaga, 29010 Málaga, Spain
| | - Juan A. Pineda
- Unidad Clínica de Enfermedades Infecciosas y Microbiología, Hospital de Valme, 41014 Sevilla, Spain; (A.C.-G.); (J.M.); (M.F.-F.); (A.G.-S.); (J.A.P.)
- Departamento de Medicina, Universidad de Sevilla, 41009 Sevilla, Spain
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Alvarez P, Mwamzuka M, Marshed F, Kravietz A, Ilmet T, Ahmed A, Borkowsky W, Khaitan A. Immune activation despite preserved CD4 T cells in perinatally HIV-infected children and adolescents. PLoS One 2017; 12:e0190332. [PMID: 29287090 PMCID: PMC5747457 DOI: 10.1371/journal.pone.0190332] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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: 09/22/2017] [Accepted: 12/12/2017] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND HIV disease progresses more rapidly in children than adults with mortality rates exceeding 50% by 2 years of age without antiretroviral therapy (ART) in sub-Saharan Africa. Recent World Health Organization (WHO) guidelines recommend universal treatment for all living persons with HIV, yet there is limited supporting evidence in pediatric populations. The objective of this study was to determine whether CD4 cell counts reflect immunological markers associated with disease progression in ART naïve perinatally-infected HIV+ children and adolescents and their response to ART. METHODS PBMC and plasma samples were collected from 71 HIV negative and 132 HIV+ children (65 ART naïve and 67 on ART) between ages 1-19 years from Mombasa, Kenya. Untreated HIV+ subjects were sub-categorized by high or low CD4 T cell counts. Immune activation markers CD38, HLA-DR and Ki67 were analyzed by flow cytometry. Plasma soluble CD14 (sCD14) was quantified by ELISA. RESULTS HIV-infected children and adolescents with preserved CD4 cell counts had depleted CD4 percentages and CD4:CD8 ratios, and high immune activation levels. ART initiation rapidly and persistently reversed T cell activation, but failed to normalize CD4:CD8 ratios and plasma sCD14 levels. CONCLUSIONS Diminished CD4 percentages and CD4:CD8 ratios along with profound immune activation occur independent of CD4 cell count thresholds in ART naïve HIV+ children and adolescents. Immediate ART initiation, as recommended in the most recent WHO guidelines may protect them from pathologic sequelae associated with persistent inflammation.
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Affiliation(s)
- Patricia Alvarez
- HIV-1 Molecular Epidemiology Laboratory, Department of Microbiology and Parasitology, Hospital Ramon y Cajal-IRYCIS and CIBERESP, Madrid, Spain
| | - Mussa Mwamzuka
- Bomu Hospital, Comprehensive Care Centre, Mombasa, Kenya
| | - Fatma Marshed
- Bomu Hospital, Comprehensive Care Centre, Mombasa, Kenya
| | - Adam Kravietz
- Department of Microbiology, New York University School of Medicine, New York, NY, United States of America
| | - Tiina Ilmet
- Department of Pediatrics, Division of Infectious Diseases and Immunology, New York University School of Medicine, New York, NY, United States of America
| | - Aabid Ahmed
- Bomu Hospital, Comprehensive Care Centre, Mombasa, Kenya
| | - William Borkowsky
- Department of Pediatrics, Division of Infectious Diseases and Immunology, New York University School of Medicine, New York, NY, United States of America
| | - Alka Khaitan
- Department of Pediatrics, Division of Infectious Diseases and Immunology, New York University School of Medicine, New York, NY, United States of America
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Merino I, Porter SB, Johnston BD, Clabots C, Shaw E, Horcajada JP, Cantón R, Ruiz-Garbajosa P, Johnson JR. Virulence genes and subclone status as markers of experimental virulence in a murine sepsis model among Escherichia coli sequence type 131 clinical isolates from Spain. PLoS One 2017; 12:e0188838. [PMID: 29190804 PMCID: PMC5708792 DOI: 10.1371/journal.pone.0188838] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [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: 07/11/2017] [Accepted: 11/14/2017] [Indexed: 01/17/2023] Open
Abstract
OBJECTIVE To assess experimental virulence among sequence type 131 (ST131) Escherichia coli bloodstream isolates in relation to virulence genotype and subclone. METHODS We analysed 48 Spanish ST131 bloodstream isolates (2010) by PCR for ST131 subclone status (H30Rx, H30 non-Rx, or non-H30), virulence genes (VGs), and O-type. Then we compared these traits with virulence in a murine sepsis model, as measured by illness severity score (ISS) and rapid lethality (mean ISS ≥ 4). RESULTS Of the 48 study isolates, 65% were H30Rx, 21% H30 non-Rx, and 15% non-H30; 44% produced ESBLs, 98% were O25b, and 83% qualified as extraintestinal pathogenic E. coli (ExPEC). Of 49 VGs, ibeA and iss were associated significantly with non-H30 isolates, and sat, iha and malX with H30 isolates. Median VG scores differed by subclone, i.e., 12 (H30Rx), 10 (H30 non-Rx), and 11 (non-H30) (p < 0.01). Nearly 80% of isolates represented a described virotype. In mice, H30Rx and non-H30 isolates were more virulent than H30 non-Rx isolates (according to ISS [p = 0.03] and rapid lethality [p = 0.03]), as were ExPEC isolates compared with non-ExPEC isolates (median ISS, 4.3 vs. 2.7: p = 0.03). In contrast, most individual VGs, VG scores, VG profiles, and virotypes were not associated with mouse virulence. CONCLUSIONS ST131 subclone and ExPEC status, but not individual VGs, VG scores or profiles, or virotypes, predicted mouse virulence. Given the lower virulence of non-Rx H30 isolates, hypervirulence probably cannot explain the ST131-H30 clade's epidemic emergence.
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Affiliation(s)
- Irene Merino
- Servicio de Microbiología, Hospital Universitario Ramón y Cajal-Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain
- Spanish Network for Research in Infectious Diseases (REIPI), Madrid, Spain
| | - Stephen B. Porter
- Minneapolis Veterans Health Care System, Minneapolis, MN, United States of America
| | | | - Connie Clabots
- Minneapolis Veterans Health Care System, Minneapolis, MN, United States of America
| | - Evelyn Shaw
- Spanish Network for Research in Infectious Diseases (REIPI), Madrid, Spain
- Servicio de Enfermedades Infecciosas, Hospital Universitario de Bellvitge-IDIBELL, Barcelona, Spain
| | - Juan Pablo Horcajada
- Hospital del Mar-Medical Research Institute of Hospital del Mar (IMIM)-CEXS Universitat Pompeu Fabra, Barcelona, Spain
| | - Rafael Cantón
- Servicio de Microbiología, Hospital Universitario Ramón y Cajal-Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain
- Spanish Network for Research in Infectious Diseases (REIPI), Madrid, Spain
| | - Patricia Ruiz-Garbajosa
- Servicio de Microbiología, Hospital Universitario Ramón y Cajal-Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain
- Spanish Network for Research in Infectious Diseases (REIPI), Madrid, Spain
| | - James R. Johnson
- Minneapolis Veterans Health Care System, Minneapolis, MN, United States of America
- University of Minnesota, Minneapolis, MN, United States of America
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Álvarez-Fraga L, Rumbo-Feal S, Pérez A, Gómez MJ, Gayoso C, Vallejo JA, Ohneck EJ, Valle J, Actis LA, Beceiro A, Bou G, Poza M. Global assessment of small RNAs reveals a non-coding transcript involved in biofilm formation and attachment in Acinetobacter baumannii ATCC 17978. PLoS One 2017; 12:e0182084. [PMID: 28763494 PMCID: PMC5538643 DOI: 10.1371/journal.pone.0182084] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [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: 04/05/2017] [Accepted: 07/12/2017] [Indexed: 12/30/2022] Open
Abstract
Many strains of Acinetobacter baumannii have been described as being able to form biofilm. Small non-coding RNAs (sRNAs) control gene expression in many regulatory circuits in bacteria. The aim of the present work was to provide a global description of the sRNAs produced both by planktonic and biofilm-associated (sessile) cells of A. baumannii ATCC 17978, and to compare the corresponding gene expression profiles to identify sRNAs molecules associated to biofilm formation and virulence. sRNA was extracted from both planktonic and sessile cells and reverse transcribed. cDNA was subjected to 454-pyrosequencing using the GS-FLX Titanium chemistry. The global analysis of the small RNA transcriptome revealed different sRNA expression patterns in planktonic and biofilm associated cells, with some of the transcripts only expressed or repressed in sessile bacteria. A total of 255 sRNAs were detected, with 185 of them differentially expressed in the different types of cells. A total of 9 sRNAs were expressed only in biofilm cells, while the expression of other 21 coding regions were repressed only in biofilm cells. Strikingly, the expression level of the sRNA 13573 was 120 times higher in biofilms than in planktonic cells, an observation that prompted us to further investigate the biological role of this non-coding transcript. Analyses of an isogenic mutant and over-expressing strains revealed that the sRNA 13573 gene is involved in biofilm formation and attachment to A549 human alveolar epithelial cells. The present work serves as a basis for future studies examining the complex regulatory network that regulate biofilm biogenesis and attachment to eukaryotic cells in A. baumannii ATCC 17978.
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Affiliation(s)
- Laura Álvarez-Fraga
- Departamento de Microbiología, Instituto de Investigación Biomédica (INIBIC), Complejo Hospitalario Universitario (CHUAC), A Coruña, Spain
| | - Soraya Rumbo-Feal
- Departamento de Microbiología, Instituto de Investigación Biomédica (INIBIC), Complejo Hospitalario Universitario (CHUAC), A Coruña, Spain
| | - Astrid Pérez
- Departamento de Microbiología, Instituto de Investigación Biomédica (INIBIC), Complejo Hospitalario Universitario (CHUAC), A Coruña, Spain
- Department of Microbiology, Miami University, Oxford, Ohio, United States of America
| | - Manuel J. Gómez
- Department of Molecular Evolution, Center for Astrobiology, INTA-CSIC, Torrejón de Ardoz, Madrid, Spain
- Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Carmen Gayoso
- Departamento de Microbiología, Instituto de Investigación Biomédica (INIBIC), Complejo Hospitalario Universitario (CHUAC), A Coruña, Spain
| | - Juan A. Vallejo
- Departamento de Microbiología, Instituto de Investigación Biomédica (INIBIC), Complejo Hospitalario Universitario (CHUAC), A Coruña, Spain
| | - Emily J. Ohneck
- Department of Microbiology, Miami University, Oxford, Ohio, United States of America
| | - Jaione Valle
- Departamento de Biofilms Microbianos, Instituto de Agrobiotecnología, Navarra, Spain
| | - Luis A. Actis
- Department of Microbiology, Miami University, Oxford, Ohio, United States of America
| | - Alejandro Beceiro
- Departamento de Microbiología, Instituto de Investigación Biomédica (INIBIC), Complejo Hospitalario Universitario (CHUAC), A Coruña, Spain
| | - Germán Bou
- Departamento de Microbiología, Instituto de Investigación Biomédica (INIBIC), Complejo Hospitalario Universitario (CHUAC), A Coruña, Spain
- * E-mail: (GB); (MP)
| | - Margarita Poza
- Departamento de Microbiología, Instituto de Investigación Biomédica (INIBIC), Complejo Hospitalario Universitario (CHUAC), A Coruña, Spain
- * E-mail: (GB); (MP)
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