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Identification of Mycobacterium Species by DNA Microarray Chip Method

Identification of Mycobacterium Species by DNA Microarray Chip Method

Published on: June 24, 2025

Identification of dermatophytes by an oligonucleotide array.

Hsin Chieh Li¹, Jean-Philippe Bouchara, Mark Ming-Long Hsu

¹Department of Medical Laboratory Science and Biotechnology, School of Medicine, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan, Republic of China.

Journal of Clinical Microbiology

|August 10, 2007

Summary

A new oligonucleotide array accurately identifies 17 dermatophyte species using internal transcribed spacer (ITS) DNA sequences. This rapid molecular method offers a reliable alternative to traditional, time-consuming identification techniques for fungal infections.

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Area of Science:

Medical Mycology
Molecular Diagnostics
Fungal Genetics

Background:

Dermatophyte identification relies on conventional methods often limited by morphology.
Accurate and rapid identification of dermatophytes is crucial for effective treatment of fungal infections.

Purpose of the Study:

To develop and validate a novel oligonucleotide array for precise identification of dermatophyte species.
To establish a molecular diagnostic tool as an alternative to conventional methods.

Main Methods:

PCR amplification of ribosomal RNA gene internal transcribed spacer (ITS) regions (ITS-1 and ITS-2).
Hybridization of labeled PCR products to an oligonucleotide array immobilized on a nylon membrane.
Testing with 198 dermatophyte and 90 nontarget strains.

Main Results:

The oligonucleotide array demonstrated high sensitivity (99.5%) and specificity (97.8%).
Accurate identification of 17 dermatophyte species was achieved within 24 hours.
Minor misidentifications were noted and attributed to sequence variations and homology.

Conclusions:

The developed oligonucleotide array is a reliable and rapid molecular method for dermatophyte identification.
This technique offers a significant improvement over conventional diagnostic approaches.
The method has potential for routine clinical use in mycology laboratories.