Novel technique of quantitative nested real-time PCR assay for Mycobacterium tuberculosis DNA

Journal of Clinical Microbiology
T Takahashi, T Nakayama

Abstract

The diagnosis of tuberculous meningitis (TBM) remains a complex issue because the most widely used conventional diagnostic tools, such as culture and PCR assay for cerebrospinal fluid (CSF) samples, are unable to rapidly detect Mycobacterium tuberculosis with sufficient sensitivity in the acute phase of TBM. Based on TaqMan PCR, we designed a novel technique consisting of an internally controlled quantitative nested real-time (QNRT) PCR assay that provided a marked improvement in detection sensitivity and quantification. We applied this novel technique to quantitatively detect M. tuberculosis DNA in CSF samples from patients with suspected TBM. For use as the internal control in the measurement of the M. tuberculosis DNA copy numbers in the QNRT-PCR assay, the original mutation (M) plasmid, which included an artificial random 22-nucleotide sequence within an inserted DNA fragment of the MPB64 gene of M. tuberculosis, was prepared. The QNRT-PCR assay showed high sensitivity and specificity that were approximately equivalent to those of the conventional nested PCR assay. Moreover, the QNRT-PCR assay made it possible to precisely and quantitatively detect the initial copy number of M. tuberculosis DNA in CSF samples. Therefore, co...Continue Reading

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