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Molecular characterization of putative virulence determinants in Burkholderia pseudomallei

Suat Moi Puah1, S D Puthucheary2, Jin Town Wang3

  • 1Department of Biomedical Science, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia.

Thescientificworldjournal
|September 13, 2014
PubMed

Insights

Two genes, BPSL2033 and BURPS1710A_1419, in Burkholderia pseudomallei, the cause of melioidosis, show minor roles in virulence. Knockout mutants had reduced survival in macrophages and lower virulence in nematode models.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Bacteriology

Background:

  • Burkholderia pseudomallei causes melioidosis, a significant infectious disease in Southeast Asia and Northern Australia.
  • The bacterium possesses numerous virulence factors contributing to its survival and pathogenicity.

Purpose of the Study:

  • To investigate the molecular roles of six specific genes (BPSL2033, BP1026B_I2784, BP1026B_I2780, BURPS1106A_A0094, BURPS1106A_1131, BURPS1710A_1419) and an additional gene (BPSL3147) in B. pseudomallei virulence.
  • To characterize these genes at a molecular level and assess their contribution to pathogenicity.

Main Methods:

  • Identification of six candidate genes using PCR-based subtractive hybridization.
  • Construction and confirmation of single-gene knockout mutants via site-specific insertion mutagenesis and PCR.
  • Evaluation of mutant survival in macrophage RAW 264.7 cells.
  • Assessment of virulence using a nematode infection model.
  • Complementation studies to restore gene function.

Main Results:

  • BPSL2033::Km and BURPS1710A_1419::Km mutants exhibited reduced survival rates within macrophages and diminished virulence in the nematode model.
  • BPSL2033::Km showed a statistically significant (P = 0.049) reduction in macrophage survival at 8 hours post-infection, though this was not observed for BURPS1710A_1419::Km.
  • Complemented strains partially restored the wild-type phenotype in both in vitro and in vivo studies.

Conclusions:

  • The genes BPSL2033 and BURPS1710A_1419 individually contribute minor roles to the overall virulence of Burkholderia pseudomallei.
  • Further research may elucidate the specific mechanisms by which these genes influence bacterial pathogenicity and host-pathogen interactions.

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