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INHIBITION OF THE POLYMERASE CHAIN REACTION BY SPUTUM SAMPLES FROM TUBERCULOSIS PATIENTS AFTER PROCESSING USING A SILICA-GUANIDINIUMTHIOCYANATE DNA ISOLATION PROCEDURE
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Abstract
With the objective to evaluate PCR-mediated detection of Mycobacterium tuberculosis DNA as a
diagnostic procedure for diagnosis of tuberculosis in individuals attending ambulatory services in
Primary Health Units of the City Tuberculosis Program in Rio de Janeiro, Brazil, their sputum samples
were collected and treated with a DNA extraction procedure using silica-guanidiniumthiocyanate.
This procedure has been described to be highly efficient for extraction of different kind of nucleic acids
from bacteria and clinical samples. Upon comparing PCR results with the number of acid-fast bacilli,
no direct relation was observed between the number of bacilli present in the sample and PCR positivity.
Part of the processed samples was therefore spiked with pure DNA of M. tuberculosis and inhibition of
the PCR reaction was verified in 22 out of 36 (61%) of the samples, demonstrating that the extraction
procedure as originally described should not be used for PCR analysis of sputum samples.
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