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Journal of Clinical Microbiology, January 2005, p. 57-65, Vol. 43, No. 1
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.1.57-65.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Assessing the Serodiagnostic Potential of 35 Mycobacterium tuberculosis Proteins and Identification of Four Novel Serological Antigens

Karin Weldingh,* Ida Rosenkrands, Limei Meng Okkels, T. Mark Doherty, and Peter Andersen

Department of Infectious Disease Immunology, Statens Serum Institut, Copenhagen, Denmark

Received 21 July 2004/ Accepted 5 September 2004

Improved diagnostic reagents are needed for the detection of Mycobacterium tuberculosis infections, and the development of a serodiagnostic test would complement presently available diagnostic methods. The aim of the present study was to identify novel serological targets for use for the future serodiagnosis of tuberculosis (TB). We cloned and expressed 35 M. tuberculosis proteins as recombinant proteins in Escherichia coli and analyzed their serodiagnostic potentials. By a two-step selection process, four superior seroantigens, TB9.7, TB15.3, TB16.3, and TB51, were identified, none of which has been described before. The four novel antigens were tested with panels of sera from smear-positive and smear-negative TB patients from areas both where TB is endemic and where TB is not endemic, with recognition frequencies ranging from 31 to 93% and with a specificity of at least 97%. The single most potent antigen was TB16.3, which had a sensitivity of 48 to 55% with samples from Danish resident TB patients and a sensitivity of 88 to 98% with samples from African TB patients. Importantly, the TB16.3 and the TB9.7 antigens were recognized by more than 85% of the samples from TB patients coinfected with human immunodeficiency virus, a patient group for which it is in general difficult to detect M. tuberculosis-specific antibodies.

* Corresponding author: Mailing address: Department of Infectious Disease Immunology, Statens Serum Institut, Artillerivej 5, DK-2300 Copenhagen S, Denmark. Phone: 45 32683817. Fax: 45 32683035. E-mail: kwe{at}ssi.dk.

Journal of Clinical Microbiology, January 2005, p. 57-65, Vol. 43, No. 1
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.1.57-65.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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