Distribution of different genes responsible for invasive characteristics, detection of point mutations in capsular gene wchA and biofilm production among the invasive and non-invasive isolates of .

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  • Additional Information
    • Affiliation:
      Department of Biotechnology, School of Life Sciences, Pondicherry University, Puducherry
      Department of Pharmacology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
      Department of Microbiology, Pondicherry Institute of Medical Sciences, Puducherry
      Jhaveri Microbiology Centre, LV Prasad Eye Institute, Hyderabad, Telangana
      Department of Microbiology, Byramjee Jeejeebhoy Government Medical College, Pune, Maharashtra
    • Subject Terms:
    • Subject Terms:
    • Abstract:
      Background: Streptococcus pneumoniae continues to cause morbidity and mortality across the globe, with developing countries bearing the brunt of the disease. It is mainly responsible for meningitis, pneumonia and septicaemia primarily in children, elderly and immunocompromised persons. Colonisation and persistence in the human nasopharynx occur during early childhood, and it appears to be prerequisite for invasive pneumococcal disease (IPD). Factors that help in persistent colonisation and subsequent invasion are ill understood. Several virulence factors have been incriminated for nasopharyngeal carriage (NC) as well as for the manifestation of the pathogenesis of IPD.Materials and Methods: This study attempts to characterise the S. pneumoniae isolates through analysing the distribution of different virulence markers such as lytA, ply, pbpA, eno, psaA, amiA, ciaR and wchA among the isolates obtained from disease and NC. A total of 37 isolates which include 14 invasive and 23 non-invasive isolates were investigated by polymerase chain reaction to detect the genes. Eight representative isolates were investigated for mutations in wchA by DNA sequencing that may responsible for capsular variation.Results: Ply, pbpA, amiA and eno were observed in a greater percentage of invasive isolates than non-invasive isolates though these differences are not statistically significant. Other two genes ciaH and psaA did not show any significant difference between two groups of isolates. Biofilm production was significantly higher in than non-invasive isolates when compared to invasive isolates. Sequence analysis of wchA revealed three significant point mutations or single-nucleotide polymorphisms (SNPs) among the isolates of one particular cluster (cluster III). These SNPs are responsible for a non-synonymous mutation in wchA bringing in an amino acid change in WchA protein, which is a part of the capsule of S. pneumoniae. Notably, all the three isolates present in cluster III had these SNPs and all of them were isolated from ocular infections.Conclusion: The results of our study implies a possible capsular variations among the isolates and this may have an impact on capsular typing.
    • Journal Subset:
      Asia; Biomedical
    • ISSN:
      0255-0857
    • MEDLINE Info:
      PMID: NLM29405142 NLM UID: 8700903
    • Publication Date:
      20180827
    • Publication Date:
      20190124
    • DOI:
      http://dx.doi.org/10.4103/ijmm.IJMM_17_183
    • Accession Number:
      128014050
  • Citations
    • ABNT:
      JOHN, J. et al. Distribution of different genes responsible for invasive characteristics, detection of point mutations in capsular gene wchA and biofilm production among the invasive and non-invasive isolates of . Indian Journal of Medical Microbiology, [s. l.], v. 35, n. 4, p. 511–517, 2017. DOI 10.4103/ijmm.IJMM_17_183. Disponível em: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=rzh&AN=128014050. Acesso em: 3 ago. 2020.
    • AMA:
      John J, Kasudhan KS, Kanungo R, Sharma S, Dohe V, Prashanth K. Distribution of different genes responsible for invasive characteristics, detection of point mutations in capsular gene wchA and biofilm production among the invasive and non-invasive isolates of . Indian Journal of Medical Microbiology. 2017;35(4):511-517. doi:10.4103/ijmm.IJMM_17_183.
    • AMA11:
      John J, Kasudhan KS, Kanungo R, Sharma S, Dohe V, Prashanth K. Distribution of different genes responsible for invasive characteristics, detection of point mutations in capsular gene wchA and biofilm production among the invasive and non-invasive isolates of . Indian Journal of Medical Microbiology. 2017;35(4):511-517. doi:10.4103/ijmm.IJMM_17_183
    • APA:
      John, J., Kasudhan, K. S., Kanungo, R., Sharma, S., Dohe, V., & Prashanth, K. (2017). Distribution of different genes responsible for invasive characteristics, detection of point mutations in capsular gene wchA and biofilm production among the invasive and non-invasive isolates of . Indian Journal of Medical Microbiology, 35(4), 511–517. https://doi.org/10.4103/ijmm.IJMM_17_183
    • Chicago/Turabian: Author-Date:
      John, James, Kripa Shanker Kasudhan, Reba Kanungo, Savitri Sharma, Vaishali Dohe, and K. Prashanth. 2017. “Distribution of Different Genes Responsible for Invasive Characteristics, Detection of Point Mutations in Capsular Gene WchA and Biofilm Production among the Invasive and Non-Invasive Isolates Of .” Indian Journal of Medical Microbiology 35 (4): 511–17. doi:10.4103/ijmm.IJMM_17_183.
    • Harvard:
      John, J. et al. (2017) ‘Distribution of different genes responsible for invasive characteristics, detection of point mutations in capsular gene wchA and biofilm production among the invasive and non-invasive isolates of ’, Indian Journal of Medical Microbiology, 35(4), pp. 511–517. doi: 10.4103/ijmm.IJMM_17_183.
    • Harvard: Australian:
      John, J, Kasudhan, KS, Kanungo, R, Sharma, S, Dohe, V & Prashanth, K 2017, ‘Distribution of different genes responsible for invasive characteristics, detection of point mutations in capsular gene wchA and biofilm production among the invasive and non-invasive isolates of ’, Indian Journal of Medical Microbiology, vol. 35, no. 4, pp. 511–517, viewed 3 August 2020, .
    • MLA:
      John, James, et al. “Distribution of Different Genes Responsible for Invasive Characteristics, Detection of Point Mutations in Capsular Gene WchA and Biofilm Production among the Invasive and Non-Invasive Isolates Of .” Indian Journal of Medical Microbiology, vol. 35, no. 4, Oct. 2017, pp. 511–517. EBSCOhost, doi:10.4103/ijmm.IJMM_17_183.
    • Chicago/Turabian: Humanities:
      John, James, Kripa Shanker Kasudhan, Reba Kanungo, Savitri Sharma, Vaishali Dohe, and K. Prashanth. “Distribution of Different Genes Responsible for Invasive Characteristics, Detection of Point Mutations in Capsular Gene WchA and Biofilm Production among the Invasive and Non-Invasive Isolates Of .” Indian Journal of Medical Microbiology 35, no. 4 (October 2017): 511–17. doi:10.4103/ijmm.IJMM_17_183.
    • Vancouver/ICMJE:
      John J, Kasudhan KS, Kanungo R, Sharma S, Dohe V, Prashanth K. Distribution of different genes responsible for invasive characteristics, detection of point mutations in capsular gene wchA and biofilm production among the invasive and non-invasive isolates of . Indian Journal of Medical Microbiology [Internet]. 2017 Oct [cited 2020 Aug 3];35(4):511–7. Available from: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=rzh&AN=128014050