Simplified amplified-fragment length polymorphism method for genotyping Mycobacterium tuberculosis isolates.

Abstract:

:A simplified amplified-fragment length polymorphism (AFLP) method was developed and applied to genotype 52 Mycobacterium tuberculosis isolates. This method can be carried out using only one restriction enzyme (XhoI), one double strand adapter, and one PCR primer. The amounts of DNA and DNA polymerase, and the concentrations of primer and Mg(2+) in the PCR step were optimized using the Basic Sequential Simplex method. AFLP analysis of the isolates generated a total of 24 differently sized bands ranging from 1537 to 121 bp, and 52 different band patterns, with a minimum of 2 and a maximum of 13 bands. The results were compared with the well-established IS6110 restriction fragment length polymorphism (IS6110-RFLP) typing method, which rendered a total of 32 differently sized bands from 1 to 12 kbp, and 52 different band patterns, with a minimum of 3 and a maximum of 15 bands. Therefore, both genotyping methods showed a discriminatory power of samples of 100%. Nevertheless, pairwise comparisons of the 1326 similarity indexes calculated for both typing methods showed a total absence of correlation between the similarity indexes of the two methods. The simplified AFLP method is expected to be more useful for genotyping M. tuberculosis isolates compared to the IS6110-RFLP method, since the former evaluates genetic variations throughout the M. tuberculosis genome. Furthermore, the relatively rapid and low-cost simplified AFLP method compares favorably to the IS6110-RFLP or conventional AFLP methods, and shows great promise for genotyping M. tuberculosis isolates, especially in developing countries or for preliminary screening.

journal_name

J Microbiol Methods

authors

Viader-Salvadó JM,Flores-Gracia J,Vega-Alonso AS,Treviño-Alvarado VM,Molina-Torres CA,Vera-Cabrera L,Guerrero-Olazarán M

doi

10.1016/j.mimet.2009.07.007

subject

Has Abstract

pub_date

2009-09-01 00:00:00

pages

331-8

issue

3

eissn

0167-7012

issn

1872-8359

pii

S0167-7012(09)00221-8

journal_volume

78

pub_type

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