Rapid detection of the cariogenic pathogens Streptococcus mutans and Streptococcus sobrinus using loop-mediated...

Area of Science:

• Microbiology
• Molecular Biology
• Biotechnology

Background:

• Dental caries is primarily caused by Streptococcus mutans and Streptococcus sobrinus.
• Accurate and rapid detection of these pathogens is crucial for early diagnosis and prevention.
• Existing detection methods may lack the speed and sensitivity required for clinical settings.

Purpose of the Study:

• To develop a rapid and sensitive detection method for Streptococcus mutans and Streptococcus sobrinus.
• To utilize loop-mediated isothermal amplification (LAMP) for pathogen detection.
• To evaluate the clinical applicability of the developed assay.

Main Methods:

• Designed species-specific primers targeting Streptococcus mutans and Streptococcus sobrinus using genomic subtractive hybridization.
• Employed loop-mediated isothermal amplification (LAMP) under isothermal conditions (63°C) for rapid amplification.
• Evaluated assay sensitivity and specificity using agarose gel electrophoresis and real-time turbidimetry.
• Quantified bacterial load in human saliva and carious dentin samples.

Main Results:

• The LAMP assay demonstrated high sensitivity, detecting as few as one bacterial cell per reaction in 30 minutes.
• Detection limits were 1-10^7 cells for S. mutans and 1-10^5 cells for S. sobrinus.
• The assay successfully detected and quantified target bacteria in clinical samples (saliva and dentin).
• Genomic subtractive hybridization proved effective for designing species-specific primers for closely related bacteria.

Conclusions:

• The developed LAMP assay, combined with subtractive hybridization, is a valuable tool for creating species-specific primers.
• This LAMP-based assay provides a rapid, sensitive, and effective method for predicting dental caries.
• The assay holds significant potential for clinical diagnosis and management of dental caries.