J Med Microbiol. 2008 Apr;57(Pt 4):439-43.

Development of an in-house loop-mediated isothermal amplification (LAMP) assay for detection of Mycobacterium tuberculosis and evaluation in sputum samples of Nepalese patients.

Pandey BD, Poudel A, Yoda T, Tamaru A, Oda N, Fukushima Y, Lekhak B, Risal B, Acharya B, Sapkota B, Nakajima C, Taniguchi T, Phetsuksiri B, Suzuki Y.

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Sukraraj Tropical and Infectious Disease Hospital, Kathmandu, Nepal.

Abstract

A number of nucleic acid amplification assays (NAAs) have been employed to detect tubercle bacilli in clinical specimens for tuberculosis (TB) diagnosis. Among these, loop-mediated isothermal amplification (LAMP) is an NAA possessing superior isothermal reaction characteristics. In the present study, a set of six specific primers targeting the Mycobacterium tuberculosis 16S rRNA gene with high sensitivity was selected and a LAMP system (MTB-LAMP) was developed. Using this system, a total of 200 sputum samples from Nepalese patients were investigated. The sensitivity of MTB-LAMP in culture-positive samples was 100 % (96/96), and the specificity in culture-negative samples was 94.2 % (98/104, 95 % confidence interval 90.5-97.9 %). The positive and negative predictive values of MTB-LAMP were 94.1 and 100 %, respectively. These results indicate that this MTB-LAMP method may prove to be a powerful tool for the early diagnosis of TB.

PMID:: 18349362; [PubMed - indexed for MEDLINE]

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