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. 1993 Mar;31(3):665–670. doi: 10.1128/jcm.31.3.665-670.1993

Simple colorimetric microtiter plate hybridization assay for detection of amplified Mycobacterium leprae DNA.

G M van der Vliet 1, C J Hermans 1, P R Klatser 1
PMCID: PMC262838  PMID: 8458960

Abstract

The detection of amplified products resulting from polymerase chain reactions (PCRs) remains a complicated process. To simplify the detection procedures, we developed a colorimetric microtiter plate hybridization assay for the specific detection of 5'-biotinylated PCR fragments of Mycobacterium leprae DNA. For this assay, an M. leprae DNA capture probe was made and immobilized on the wells of a microtiter plate. Hybridization of the biotin-labeled PCR fragments was detected through enzymatic color development. The resulting optical densities showed a logarithm-linear relationship with the amount of template DNA and corresponded to the intensity of the bands obtained through gel analysis and Southern blotting of the PCR products. The sensitivity of the assay was found to be 125 fg of genomic M. leprae DNA, or 20 lysed bacilli, revealing a detection limit similar to that of agarose gel analysis. The efficient coamplification of human DNA was used as a positive control for the presence of inhibitory substances in clinical material. For detection of human PCR products, a human DNA capture probe was also constructed for the colorimetric assay. This dual setup for hybridization, which thus detected both M. leprae and human DNA PCR products, was useful for ascertaining the presence of inhibiting substances in clinical specimens. All biopsy specimens (n = 10) from untreated patients with leprosy were positive. Apparently, this assay is more sensitive than microscopy, because biopsy specimens from half of the patients were negative upon histopathological examination. Biopsy specimens from three treated patients were negative, as were those from the three patients who did not have leprosy. We conclude that this colorimetric assay can replace agarose gel analysis and Southern hybridization, because it is as sensitive as those methods. Its advantages over conventional gel analysis and Southern hybridization are that it is less cumbersome and more rapid.

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Selected References

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