Colorimetric microwell plate reverse-hybridization assay for Mycobacterium tuberculosis detection
Mem. Inst. Oswaldo Cruz
; 106(2): 194-199, Mar. 2011. tab
Article
en En
| LILACS
| ID: lil-583945
Biblioteca responsable:
BR1.1
ABSTRACT
Direct smear examination using Ziehl-Neelsen staining for pulmonary tuberculosis (PTB) diagnosis is inexpensive and easy to use, but has the major limitation of low sensitivity. Rapid molecular methods are becoming more widely available in centralized laboratories, but they depend on timely reporting of results and strict quality assurance obtainable only from costly commercial kits available in high burden nations. This study describes a pre-commercial colorimetric method, Detect-TB, for detecting Mycobacterium tuberculosis DNA in which an oligonucleotide probe is fixed onto wells of microwell plates and hybridized with biotinylated polymerase chain reaction amplification products derived from clinical samples. The probe is capable of hybridising with the IS6110 insertion element and was used to specifically recognise the M. tuberculosis complex. When combined with an improved silica-based DNA extraction method, the sensitivity of the test was 50 colony-forming units of the M. tuberculosis reference strain H37Rv. The results that were in agreement with reference detection methods were observed in 95.2 percent (453/476) of samples included in the analysis. Sensitivity and specificity for 301 induced sputum samples and 175 spontaneous sputum samples were 85 percent and 98 percent, and 94 percent and 100 percent, respectively. This colorimetric method showed similar specificity to that described for commercially available kits and may provide an important contribution for PTB diagnosis.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
LILACS
Asunto principal:
Esputo
/
Tuberculosis Pulmonar
/
Reacción en Cadena de la Polimerasa
/
Mycobacterium tuberculosis
/
Hibridación de Ácido Nucleico
Tipo de estudio:
Diagnostic_studies
Límite:
Humans
Idioma:
En
Revista:
Mem. Inst. Oswaldo Cruz
Asunto de la revista:
MEDICINA TROPICAL
/
PARASITOLOGIA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Brasil