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Temperature-mediated heteroduplex analysis performed by using denaturing high-performance liquid chromatography to
Robert C Cooksey1, Glenn P Morlock, Brian P Holloway
1Division of AIDS, STD, and TB Laboratory Research, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Road, Atlanta, GA 30333, USA. rcc1@cdc.gov
Journal of Clinical Microbiology
|May 1, 2002
Summary
This study introduces a novel method using denaturing high-performance liquid chromatography to detect genetic mutations in mycobacteria. This technique efficiently screens for drug resistance and specific polymorphisms, offering a cost-effective alternative for molecular diagnostics.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- Genetic mutations in mycobacteria are linked to drug resistance and species identification.
- Accurate detection of these polymorphisms is crucial for effective tuberculosis treatment and control.
- Existing methods for mutation detection can be costly and time-consuming.
Purpose of the Study:
- To develop and evaluate a novel temperature-mediated heteroduplex analysis method for detecting genetic polymorphisms in mycobacteria.
- To assess the utility of this method for identifying mutations associated with antituberculosis drug resistance.
- To screen for a specific polymorphism in the oxyR gene within the Mycobacterium tuberculosis complex.
Main Methods:
- Polymerase chain reaction (PCR) products from six mycobacterial genes were prepared.
- Denatured PCR products were mixed with reference products and reannealed to form heteroduplexes.
- Heteroduplexes were analyzed using a denaturing high-performance liquid chromatography (DHPLC) system (WAVE).
Main Results:
- Altered DNA elution patterns were observed due to base mismatches in heteroduplexes.
- The method successfully detected 20 polymorphisms across six genes, including oxyR, rpoB, katG, pncA, rpsL, and embB.
- Detectable shifts in elution patterns occurred at specific temperatures (65.3–68°C) and elution times (3.5–6 min).
Conclusions:
- Temperature-mediated heteroduplex analysis is a valuable genotypic screening tool for antituberculosis drug resistance mutations.
- This method can identify the G(1031)A polymorphism in the oxyR gene.
- The technique offers a potentially cost-effective way to detect both known and novel mutations without specialized kits or labels.