Comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant Acinetobacter baumannii (CRAB)
Abstract Abstract Carbapenem resistant Acinetobacter baumannii has evolved as the most troublesome microorganism with multiple virulence factors. Biofilm formation, porins, micronutrient capturing mechanism and quorum sensing, provide protection against desiccation, host-pathogen killing and enhance...
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2025-01-01
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| Online Access: | https://doi.org/10.1186/s12866-024-03727-1 |
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| author | Swati Sharma Kamal Singh Ashish Chaurasiya Tuhina Banerjee Royana Singh Ghanshyam Yadav Ashok Kumar |
| author_facet | Swati Sharma Kamal Singh Ashish Chaurasiya Tuhina Banerjee Royana Singh Ghanshyam Yadav Ashok Kumar |
| author_sort | Swati Sharma |
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| description | Abstract Abstract Carbapenem resistant Acinetobacter baumannii has evolved as the most troublesome microorganism with multiple virulence factors. Biofilm formation, porins, micronutrient capturing mechanism and quorum sensing, provide protection against desiccation, host-pathogen killing and enhance its persistence. The conservation of these factors between colonizing and pathogenic carbapenem resistant A. baumannii has been barely investigated. We studied biofilm formation, desiccation survival, motility and hemolysis in pathogenic carbapenem resistant A. baumannii and colonizer carbapenem resistant A. baumannii from the hospital environment. The virulent genes pgaA, csuE, bap, ompA, abaI, pilA and bauA were detected by simplex-PCR and Quantitative Real-Time PCR was done for expressional studies. In-vivo survival percentage was studied by Galleria mellonella (wax moth) killing assay. Phenotypic characterization revealed that the biofilm formation and desiccation survival proportion was significantly higher in colonizer carbapenem resistant A. baumannii (p < 0.05). Twitching motility was found comparable (mean 0.5 to 1.5 cm). Surface associated motility varied widely. None showed hemolysis. The csuE, bap, ompA, abaI, pilA and bauA genes were detected in almost all the pathogenic and colonizer carbapenem resistant A. baumannii isolates while none harboured pgaA gene. The expression of bap, ompA and bauA gene was found significantly higher in pathogenic carbapenem resistant A. baumannii while expression of csuE and abaI gene was comparable in both. Overexpression of pilA gene was seen in those with higher surface associated motility. Pathogenic carbapenem resistant A. baumannii showed significantly higher pathogenicity in-vivo, as 100% of larvae died on 4th day post-infection. In conclusion high level expression of outer membrane proteins (ompA) and siderophores is significantly associated with the pathogenicity in carbapenem resistant A. baumannii isolated from infections, which can be a differentiating point from the colonizers. Clinical Trial Not Applicable |
| format | Article |
| id | doaj-art-f4f77391ebad43bf90b462c2094aa67f |
| institution | Kabale University |
| issn | 1471-2180 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | BMC |
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| series | BMC Microbiology |
| spelling | doaj-art-f4f77391ebad43bf90b462c2094aa67f2025-01-12T12:10:10ZengBMCBMC Microbiology1471-21802025-01-012511910.1186/s12866-024-03727-1Comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant Acinetobacter baumannii (CRAB)Swati Sharma0Kamal Singh1Ashish Chaurasiya2Tuhina Banerjee3Royana Singh4Ghanshyam Yadav5Ashok Kumar6Department of Microbiology, Institute of Medical Sciences, Banaras Hindu UniversityDepartment of Microbiology, Institute of Medical Sciences, Banaras Hindu UniversityMultidisciplinary Research Unit, Institute of Medical Sciences, Banaras Hindu UniversityDepartment of Microbiology, Institute of Medical Sciences, Banaras Hindu UniversityMultidisciplinary Research Unit, Institute of Medical Sciences, Banaras Hindu UniversityDepartment of Anaesthesiology, Institute of Medical Sciences, Banaras Hindu UniversityDepartment of Pediatrics, Institute of Medical Sciences, Banaras Hindu UniversityAbstract Abstract Carbapenem resistant Acinetobacter baumannii has evolved as the most troublesome microorganism with multiple virulence factors. Biofilm formation, porins, micronutrient capturing mechanism and quorum sensing, provide protection against desiccation, host-pathogen killing and enhance its persistence. The conservation of these factors between colonizing and pathogenic carbapenem resistant A. baumannii has been barely investigated. We studied biofilm formation, desiccation survival, motility and hemolysis in pathogenic carbapenem resistant A. baumannii and colonizer carbapenem resistant A. baumannii from the hospital environment. The virulent genes pgaA, csuE, bap, ompA, abaI, pilA and bauA were detected by simplex-PCR and Quantitative Real-Time PCR was done for expressional studies. In-vivo survival percentage was studied by Galleria mellonella (wax moth) killing assay. Phenotypic characterization revealed that the biofilm formation and desiccation survival proportion was significantly higher in colonizer carbapenem resistant A. baumannii (p < 0.05). Twitching motility was found comparable (mean 0.5 to 1.5 cm). Surface associated motility varied widely. None showed hemolysis. The csuE, bap, ompA, abaI, pilA and bauA genes were detected in almost all the pathogenic and colonizer carbapenem resistant A. baumannii isolates while none harboured pgaA gene. The expression of bap, ompA and bauA gene was found significantly higher in pathogenic carbapenem resistant A. baumannii while expression of csuE and abaI gene was comparable in both. Overexpression of pilA gene was seen in those with higher surface associated motility. Pathogenic carbapenem resistant A. baumannii showed significantly higher pathogenicity in-vivo, as 100% of larvae died on 4th day post-infection. In conclusion high level expression of outer membrane proteins (ompA) and siderophores is significantly associated with the pathogenicity in carbapenem resistant A. baumannii isolated from infections, which can be a differentiating point from the colonizers. Clinical Trial Not Applicablehttps://doi.org/10.1186/s12866-024-03727-1ompAcsuEbauAColonizer CRABPathogenic CRABQuorum sensing |
| spellingShingle | Swati Sharma Kamal Singh Ashish Chaurasiya Tuhina Banerjee Royana Singh Ghanshyam Yadav Ashok Kumar Comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant Acinetobacter baumannii (CRAB) BMC Microbiology ompA csuE bauA Colonizer CRAB Pathogenic CRAB Quorum sensing |
| title | Comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant Acinetobacter baumannii (CRAB) |
| title_full | Comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant Acinetobacter baumannii (CRAB) |
| title_fullStr | Comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant Acinetobacter baumannii (CRAB) |
| title_full_unstemmed | Comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant Acinetobacter baumannii (CRAB) |
| title_short | Comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant Acinetobacter baumannii (CRAB) |
| title_sort | comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant acinetobacter baumannii crab |
| topic | ompA csuE bauA Colonizer CRAB Pathogenic CRAB Quorum sensing |
| url | https://doi.org/10.1186/s12866-024-03727-1 |
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