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Journal of Clinical Microbiology, August 2000, p. 2962-2965, Vol. 38, No. 8
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Identification of Members of the Burkholderia cepacia Complex by Species-Specific PCR

Paul W. Whitby,1 Karen B. Carter,1 Kenneth L. Hatter,1 John J. LiPuma,2 and Terrence L. Stull1,3,*

Departments of Pediatrics1 and Microbiology/Immunology,3 University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104, and Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan 481092

Received 22 March 2000/Returned for modification 21 April 2000/Accepted 27 May 2000

Definitive identification of the species in the Burkholderia cepacia complex by routine clinical microbiology methods is difficult. Phenotypic tests to identify B. multivorans and B. vietnamiensis have been established; more recent work indicates B. stabilis may also be identified by growth characteristics and biochemical tests. However, attempts to identify genomovars I and III have, thus far, proved unsuccessful. Previously, we demonstrated the utility of two primer pairs, directed to the rRNA operon, to specifically identify the B. cepacia complex in a PCR. One of these primer pairs, G1-G2, only amplified a DNA fragment from genomovars I and III and B. stabilis in a PCR with genomic DNA isolated from prototypical strains representing the five genomovars. Sequence analysis of the rRNA operon for all the genomovars indicated that this primer pair targeted a region shared by these isolates. Further analysis revealed a region of heterogeneity between genomovar III and B. stabilis internal to the amplified product of G1-G2. Primers designed to target this region were tested with prototypical strains following an initial amplification with the G1-G2 primer pair. New primers specific for the prototypical genomovar III and B. stabilis were designated SPR3 and SPR4, respectively. Analysis of 93 isolates representing 18 genomovar I, 13 B. multivorans, 36 genomovar III, 11 B. stabilis, and 15 B. vietnamiensis isolates was performed. DNA from all isolates of genomovars I and III and B. stabilis was amplified by G1-G2. Genomovar III isolates yielded a product with SPR3/G1 while B. stabilis amplified with SPR4-G1. Genomovar I isolates were amplified by either SPR3-G1 or SPR4-G1, but not both. B. multivorans yielded a product with SPR3-G1 but not G1-G2, and B. vietnamiensis isolates were negative in all PCRs. Thus using an algorithm with G1-G2, SPR3-G1, and SPR4-G1 primers in a PCR analysis, genomovar III isolates can be separated from B. stabilis and the identity of B. multivorans and B. vietnamiensis can be confirmed.

* Corresponding author. Mailing address: Department of Pediatrics, CHO 2308, 940 N.E. 13th St., Oklahoma City, OK 73104. Phone: (405) 271-4401. Fax: (405) 271-8710. E-mail: Terrence-Stull{at}ouhsc.edu.

Journal of Clinical Microbiology, August 2000, p. 2962-2965, Vol. 38, No. 8
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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