The use of macroarrays for the identification of MDR Mycobacterium tuberculosis
The emergence of Mycobacterium tuberculosis ( Mtb), resistant to both isoniazid (INH) and rifampicin (RIF) (MDR-TB), is an increasing threat to tuberculosis control programs. Susceptibility testing of Mtb complex isolates by phenotypic methods requires a minimum of 14 days from a primary specimen. T...
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Published in | Journal of microbiological methods Vol. 65; no. 2; pp. 294 - 300 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Shannon
Elsevier B.V
01.05.2006
Elsevier Science |
Subjects | |
Online Access | Get full text |
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Summary: | The emergence of
Mycobacterium tuberculosis (
Mtb), resistant to both isoniazid (INH) and rifampicin (RIF) (MDR-TB), is an increasing threat to tuberculosis control programs. Susceptibility testing of
Mtb complex isolates by phenotypic methods requires a minimum of 14 days from a primary specimen. This can be reduced significantly if molecular analysis is used. Low density oligonucleotide arrays (macroarrays) have been used successfully for the detection of RIF resistance in
Mtb. We describe the use of macroarray technology to identify
Mtb complex isolates resistant to INH and/or RIF. The macroarray MDR-
Mtb screen has been designed to detect mutations in the RIF resistance determining region (RRDR) of
Mtb rpoB and loci in
katG and
mabA
-inhA associated with INH resistance. A panel of
Mtb isolates containing 38 different RRDR genotypes, 4 different genotypes within codon 315 of
katG and 2 genotypes at
mabA
-inhA was used to validate the macroarray. The wild type (WT) genotype was correctly identified at all three loci. Of the 37 mutant
rpoB genotypes, 36 were correctly detected; the single mutant not detected contained a 9 base insertion. All mutations within
katG and
mabA
-inhA were correctly identified. We conclude that this low cost, rapid system can usefully detect the mutations associated with the vast majority of MDR-
Mtb. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0167-7012 1872-8359 |
DOI: | 10.1016/j.mimet.2005.08.002 |