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Journal of Clinical Microbiology, April 2002, p. 1146-1151, Vol. 40, No. 4
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.4.1146-1151.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Genetic Diversity of Pneumocystis carinii f. sp. hominis Based on Variations in Nucleotide Sequences of Internal Transcribed Spacers of rRNA Genes

Laila F. Nimri,^1* Iaci N. S. Moura,¹ Laurence Huang,² Carlos del Rio,³ David Rimland,^3,4 Jeffrey S. Duchin,⁵ Ellen M. Dotson,¹ and Charles B. Beard¹

Centers for Disease Control and Prevention,¹ Division of Infectious Diseases, Emory University School of Medicine ,³ Veterans Affairs Medical Center, Atlanta, Georgia,⁴ San Francisco General Hospital, University of California, San Francisco, California,² Division of Infectious Diseases, University of Washington, Seattle, Washington⁵

Received 15 October 2001/ Returned for modification 10 December 2001/ Accepted 7 January 2002

A variety of genes have been used to type Pneumocystis carinii. In the present study, nucleotide sequence variations in the ITS1 and ITS2 internal transcribed spacer (ITS) regions of the rRNA genes were used to type Pneumocystis carinii f. sp. hominis DNA obtained from the lungs of 60 human immunodeficiency virus-infected individuals. These regions were amplified by PCR, cloned, and sequenced. Multibase polymorphisms were identified among samples. Several new genotypes are reported on the basis of the nucleotide sequence variations at previously unreported positions of both the ITS1 and the ITS2 regions. Twelve new ITS1 sequences were observed, in addition to the nine sequence types reported previously. The most common was type E, which was observed in 60.5% of the samples. The sequence variations in the ITS1 region were mainly located at positions 5, 12, 23, 24, 45, 53, and 54. Sixteen new ITS2 types were also identified, in addition to the 13 types reported previously. The most common was type g (26.6%). The sequences of the ITS2 regions in most specimens were different from the previously published sequence at bases 120 and 166 through 183. The most common variations observed were deletions at positions 177 through 183. The presence of more than one sequence type in some patients (60%) suggested the occurrence of coinfection with multiple P. carinii strains. The genetic polymorphism observed demonstrates the degree of diversity of Pneumocystis strains that infect humans. Furthermore, the high degree of polymorphism suggests that these genes are evolving faster than other genes. Consequently, the sequence information derived is useful for purposes such as examination of the potential of person-to-person transmission and recurrent infections but perhaps not for other genotyping applications that rely on more stable genetic loci.

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* Corresponding author. Present address: Department of Applied Biology, JUST, P.O. Box 3030, Irbid 22110, Jordan. Phone: (9622)709-5111. Fax: (9622)709-5014. E-mail: nimri{at}just.edu.jo.

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Journal of Clinical Microbiology, April 2002, p. 1146-1151, Vol. 40, No. 4
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.4.1146-1151.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

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