An efficient alternative marker for specific identification of Mycobacterium tuberculosis

Area of Science:

• Molecular Biology
• Microbiology
• Genetics

Background:

• Accurate identification of mycobacteria, particularly Mycobacterium tuberculosis (MTB), is crucial for epidemiology and treatment guidance in tuberculosis.
• Existing diagnostic methods have limitations in speed and specificity for MTB identification.

Purpose of the Study:

• To evaluate the Mycobacterium tuberculosis specific sequence 90 (mtss90) as a novel genetic marker for the rapid and specific identification of MTB.
• To compare the diagnostic efficiency of mtss90 with established genetic markers and traditional methods.

Main Methods:

• Bioinformatic screening and experimental verification of the mtss90 genetic marker.
• Conventional PCR using mtss90 was performed on 266 strains of microorganisms and human cells to assess specificity.
• Comparative analysis of mtss90 efficiency against 16S rDNA, IS6110, mtp40, and the PNB/TCH method in Mycobacterium strains.

Main Results:

• All tested Mycobacterium tuberculosis isolates were positive for mtss90, demonstrating high sensitivity.
• Except for Mycobacterium microti, mtss90 showed no amplification in other tested microbial strains, indicating excellent specificity.
• mtss90 exhibited a 99.1% coincidence rate with the traditional PNB/TCH method and 100% with 16S rDNA and IS6110 markers, outperforming mtp40 in specificity.

Conclusions:

• The Mycobacterium tuberculosis specific sequence 90 (mtss90) is a highly specific and efficient genetic marker for identifying Mycobacterium tuberculosis.
• mtss90 holds potential as an alternative marker for species-specific MTB identification and can be integrated into diagnostic assays for tuberculosis.
• Development of a real-time PCR assay utilizing mtss90 facilitates rapid MTB identification, aiding in timely tuberculosis diagnosis and management.