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The Scientific World JournalVolume 2014 2014, Article ID 590803, 9 pages

Research Article

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

Department of Medical Education, Research and Evaluation, Duke-NUS Graduate Medical School Singapore, 8 College Road, Singapore 169857

Department of Microbiology, National Taiwan University College of Medicine, Section 1, Jen-Ai Road, Taipei 10051, Taiwan

Department of Internal Medicine, National Taiwan University Hospital, Taipei 10051, Taiwan

Received 24 May 2014; Accepted 9 July 2014; Published 11 August 2014

Academic Editor: Adhar C. Manna

Copyright © 2014 Suat Moi Puah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The Gram-negative saprophyte Burkholderia pseudomallei is the causative agent of melioidosis, an infectious disease which is endemic in Southeast Asia and northern Australia. This bacterium possesses many virulence factors which are thought to contribute to its survival and pathogenicity. Using a virulent clinical isolate of B. pseudomallei and an attenuated strain of the same B. pseudomallei isolate, 6 genes BPSL2033, BP1026B I2784, BP1026B I2780, BURPS1106A A0094, BURPS1106A 1131, and BURPS1710A 1419 were identified earlier by PCR-based subtractive hybridization. These genes were extensively characterized at the molecular level, together with an additional gene BPSL3147 that had been identified by other investigators. Through a reverse genetic approach, single-gene knockout mutants were successfully constructed by using site-specific insertion mutagenesis and were confirmed by PCR. BPSL2033::Km and BURPS1710A 1419::Km mutants showed reduced rates of survival inside macrophage RAW 264.7 cells and also low levels of virulence in the nematode infection model. BPSL2033::Km demonstrated weak statistical significance at 8 hours after infection in macrophage infection study but this was not seen in BURPS1710A 1419::Km. Nevertheless, complemented strains of both genes were able to partially restore the gene defects in both in vitro and in vivo studies, thus suggesting that they individually play a minor role in the virulence of B. pseudomallei.

Author: Suat Moi Puah, S. D. Puthucheary, Jin Town Wang, Yi Jiun Pan, and Kek Heng Chua



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