The selection and application of ssDNA aptamers against MPT64 protein in Mycobacterium tuberculosis
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Lianhua Qin
Abstract
Background: Tuberculosis (TB) remains a major health problem affecting millions of people worldwide. One-third of the world's population is infected with Mycobacterium tuberculosis, the etiologic agent of TB. A simple and rapid method to diagnose TB is urgently needed to be developed. The procedure of systematic evolution of ligands by exponential enrichment (SELEX) is a method in which single-stranded oligonucleotides (called aptamers) are selected from a wide variety of sequences, based on their interaction with a target molecule. Aptamers have been used in numerous investigations as therapeutic or diagnostic tools.
Methods: In this study, we apply a SELEX method to develop aptamers against MPT64 protein from M. tuberculosis. On this basis, a sandwich assay scheme with the complex of aptamer-MPT64 was designed and tested the feasibility of detecting M. tuberculosis by detecting MPT64 protein levels in the culture filtrates of 77 samples including M. tuberculosis and other Mycobacterium species.
Results: There was a highly significant difference (p<0.01) between group A (non-TB Mycobacterium, bacille Calmette-Guérin) and group B (M. tuberculosis, M. bovis), when they were diagnosed with the sandwich assay scheme based on aptamer-protein complex to detect MPT64 protein levels in the culture filtrates of samples. When the cut-off point was at the optical density value of 0.58 (95%=0.764–0.946; Z=6.130, p=0.0001), the sandwich assay scheme based on aptamer-protein complex had a high sensitivity (negative ration, 24/27, 86.3%) and specificity (positive ration, 46/52, 88.5%).
Conclusions: Aptamer of MPT64 as a new detection tool, to a certain extent, is feasible to diagnose Mycobacterium tuberculosis.
Clin Chem Lab Med 2009;47:405–11.
©2009 by Walter de Gruyter Berlin New York
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Artikel in diesem Heft
- Minireview
- Risk loci for type 2 diabetes – Quo vadis?
- Genetics and Molecular Diagnostics
- A common variant in the FTO gene is associated with body mass index in males and postmenopausal females but not in premenopausal females. Czech post-MONICA and 3PMFs studies
- Genotype distribution of estrogen receptor α polymorphisms in pregnant women from healthy and preeclampsia populations and its relation to blood pressure levels
- Do common genetic variants in endotoxin signaling pathway contribute to predisposition to alcoholic liver cirrhosis?
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- Stromal cell-derived factor-1 but not its receptor, CXCR4, gene variants increase susceptibility and pathological development of hepatocellular carcinoma
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