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dc.contributor.advisorPinilla Bermúdez, Gladys
dc.contributor.advisorDe La Cadena Vivas, Elsa Piedad
dc.contributor.authorMahecha López, Mateo
dc.contributor.authorVelandia López, Ana María
dc.date.accessioned2022-05-11T00:27:05Z
dc.date.available2022-05-11T00:27:05Z
dc.date.issued2021-09-03
dc.identifier.urihttps://repositorio.unicolmayor.edu.co/handle/unicolmayor/5552
dc.description.abstractLa resistencia bacteriana es un problema de carácter mundial que pone en riesgo la salud humana y agota las opciones terapéuticas contra bacterias patógenas multiresistentes a los antibióticos. La resistencia a la colistina estaba asociada a mutaciones cromosomales, sin embargo, en el año 2015 reportaron por primera vez el gen mcr-1 que genera resistencia a polimixinas a través de plásmidos. Después de este, se han realizado reportes prácticamente por todo el mundo, asociados tanto a aislamientos de origen animal como humanos. En Colombia fue detectado por primera vez en el año 2016 en tres aislamientos de Salmonella entérica serovar Typhimurium y un aislamiento de E. coli. En esta investigación se estudiaron 32 aislados de E. coli recolectados de instituciones hospitalarias de tercer nivel en Colombia con el objetivo de determinar las características genéticas y fenotipicas de resistencia.De los 32 aislamientos estudiados, se confirmaron 7 como resistentes a colistina por metodología CBDE. La PCR mostro que 5 de los 7 aislados portaban genes mcr-1,uno de estos con fenotipo BLEE resistente a ceftriaxona, cefotaxime y susceptibilidad reducida a ceftazidime y confirmación de CTXM-55 por SGC.Dos aislamientos presentaron clonalidad del 100% por PFGE, la mayoria de aislados con grupo filogenético B1 y dos compartiendo el mismo MLST, se detectaron distintos plasmidos con predominio IncFII y dentro de su entorno genético se pudo identificar un aislado portando mcr-1 posiblemente en un plasmido tipo Incl.spa
dc.description.tableofcontents1. Planteamiento del problema 8 2. Objetivos 9 2.1 Objetivo general 9 2.2 Objetivos específicos 9 3. Justificación 10 4. Marco teórico 12 4.1 Antecedentes 12 4.2 Bases teóricas 21 4.2.1 Resistencia bacteriana 21 4.2.2 Polimixinas 23 4.2.3 Mecanismos de resistencia a polimixinas 24 4.2.4 Detección de genes mcr-1 implicados en la resistencia a polimixinas 25 4.2.5 Plásmidos implicados en la diseminación de genes mcr-1 26 4.2.6 Escherichia coli 27 4.2.7 Clones de alto riesgo 28 4.2.8 Relación entre genes mcr-1 y otros genes de resistencia 29 4.2.9. Multilocus sequence typing (MLST) 30 4.2.10 Métodos para evaluar la susceptibilidad a polimixinas 31 4.3 Marco legal 32 5. Diseño metodológico 33 5.1 Tipo de investigación 33 5.2 Impacto de la investigación 33 5.3 Población y criterios de inclusión 33 5.4 Técnicas y procedimientos 34 5.4.1 Pruebas de susceptibilidad antimicrobiana 34 5.4.2 Identificación molecular de genes mcr-1 y otros genes de resistencia 37 5.4.3 Electroforesis de Campos Pulsados (PFGE) para estudio de clonalidad molecular 38 5.4.4 Secuenciación de Genoma Completo 38 5.4.5 Análisis de bioinformática 39 5.4.6 Plan de análisis de datos 40 6. Resultados 40 6.1 Confirmación de resistencia a colistina 40 6.2 Detección de genes mcr-1 42 6.3 Análisis fenotípico de susceptibilidad antibiótica 43 6.4 Análisis de clonalidad 43 6.5 Análisis de secuencias de genoma completo 44 6.5.1 Genes de virulencia 45 6.5.2 Plásmidos de incompatibilidad 45 6.5.3 Resistoma 46 6.5.4 Entorno genético de mcr-1 47 7. Discusión 47 8. Conclusiones 51 9. Referencias bibliográficas 52spa
dc.format.extent57p.spa
dc.format.mimetypeapplication/pdfspa
dc.language.isospaspa
dc.publisherUniversidad Colegio Mayor de Cundinamarcaspa
dc.rightsDerechos Reservados - Universidad Colegio Mayor de Cundinamarca, 2021spa
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/4.0/spa
dc.titleCaracterización molecular de genes de resistencia mcr-1 en aislamientos de E. coli resistentes a colistina de instituciones de tercer nivel en Colombiaspa
dc.typeTrabajo de grado - Pregradospa
dc.description.degreelevelPregradospa
dc.description.degreenameBacteriólogo(a) y Laboratorista Clínicospa
dc.publisher.facultyFacultad de Ciencias de la Saludspa
dc.publisher.placeBogotáspa
dc.publisher.programBacteriología y Laboratorio Clínicospa
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dc.rights.accessrightsinfo:eu-repo/semantics/closedAccessspa
dc.rights.creativecommonsAtribución-NoComercial-CompartirIgual 4.0 Internacional (CC BY-NC-SA 4.0)spa
dc.subject.lembResistencia bacteriana
dc.subject.lembE. coli
dc.subject.proposalColistinaspa
dc.subject.proposalmcr-1spa
dc.type.coarhttp://purl.org/coar/resource_type/c_7a1fspa
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Derechos Reservados - Universidad Colegio Mayor de Cundinamarca, 2021
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