Differentiation of clinical Mycobacterium tuberculosis complex isolates by their GyrB polymorphism.
Indian J Med Microbiol
;
2010 Jan-Mar; 28(1): 26-29
Article
in English
| IMSEAR
| ID: sea-143641
ABSTRACT
Purpose:
To evaluate the reliability of the gyrB PCR-RFLP technique in differentiating clinical Mycobacterium tuberculosis complex isolates. Materials andMethods:
A primer pair MTUB-f and MTUB-r for M. tuberculosis complex (MTBC) was used to differentiate 79 mycobacterial isolates by specific amplification of the 1,020-bp fragment of the gyrB gene (gyrB-PCR1). The MTBC isolates were further differentiated using a set of specific primers MTUB-756-Gf and MTUB-1450-Cr that allowed selective amplification of the gyrB fragment specific for M. tuberculosis (gyrB-PCR2). The DNA polymorphisms in the 1,020-bp gyrB fragment for 7 M. tuberculosis strains confirmed by PCR as well as 2 reference strains; M. tuberculosis H37Rv and M. bovis BCG were analyzed with the restriction enzyme Rsa1.Results:
Seventy-seven (97.5%) isolates were positive for gyrB-PCR1 and thus identified as members of M. tuberculosis complex (MTBC) and two (2.6%) isolates were negative and identified as Mycobacteria other than tuberculosis (MOTT). All the M. tuberculosis isolates showed the typical M. tuberculosis specific Rsa1 RFLP patterns (100, 360, 560-bp) while 360 and 480-bp fragments were generated from M. bovis BCG.Conclusion:
The gyrB PCR-RFLP using the endonuclease Rsa1 can be used to differentiate M. tuberculosis from M. bovis in clinical isolates.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Language:
English
Journal:
Indian J Med Microbiol
Journal subject:
Microbiology
Year:
2010
Type:
Article
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