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Infection and Immunity, December 2007, p. 5798-5805, Vol. 75, No. 12
0019-9567/07/$08.00+0     doi:10.1128/IAI.00335-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

DNA Polymorphisms in the pepA and PPE18 Genes among Clinical Strains of Mycobacterium tuberculosis: Implications for Vaccine Efficacy

Andrea M. Hebert,¹ Sarah Talarico,¹ Dong Yang,¹ Riza Durmaz,² Carl F. Marrs,¹ Lixin Zhang,¹ Betsy Foxman,¹ and Zhenhua Yang^1*

Department of Epidemiology, University of Michigan, Ann Arbor, Michigan 48109,¹ Medical Microbiology, Medical Faculty, Inonu University, Malatya, Turkey²

Received 2 March 2007/ Returned for modification 2 May 2007/ Accepted 3 August 2007

Tuberculosis continues to be a leading cause of death worldwide. Development of an effective vaccine against Mycobacterium tuberculosis is necessary to reduce the global burden of this disease. Mtb72F, consisting of the protein products of the pepA and PPE18 genes, is the first subunit tuberculosis vaccine to undergo phase I clinical trials. To obtain insight into the ability of Mtb72F to induce an immune response capable of recognizing different strains of M. tuberculosis, we investigated the genomic diversity of the pepA and PPE18 genes among 225 clinical strains of M. tuberculosis from two different geographical locations, Arkansas and Turkey, representing a broad range of genotypes of M. tuberculosis. A combination of single nucleotide polymorphisms (SNPs) and insertion/deletions resulting in amino acid changes in the PPE18 protein occurred in 47 (20.9%) of the 225 study strains, whereas SNPs resulted in amino acid changes in the PepA protein in 14 (6.2%) of the 225 study strains. Of the 122 Arkansas study strains and the 103 Turkey study strains, 32 (26.2%) and 15 (14.6%), respectively, had at least one genetic change leading to an alteration of the amino acid sequence of the PPE18 protein, and many of the changes occurred in regions previously reported to be potential T-cell epitopes. Thus, immunity induced by Mtb72F may not recognize a proportion of M. tuberculosis clinical strains.

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* Corresponding author. Mailing address: Epidemiology Department, School of Public Health, University of Michigan, 109 S. Observatory Street, Ann Arbor, MI 48109-2029. Phone: (734) 763-4296. Fax: (734) 764-3192. E-mail: zhenhua{at}umich.edu

Published ahead of print on 24 September 2007.

Editor: J. L. Flynn

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Infection and Immunity, December 2007, p. 5798-5805, Vol. 75, No. 12
0019-9567/07/$08.00+0     doi:10.1128/IAI.00335-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

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