Rapid and visual Chlamydia trachomatis detection using loop-mediated isothermal amplification and hydroxynaphthol...

Area of Science:

• Molecular Biology
• Infectious Diseases
• Diagnostics

Background:

• Chlamydia trachomatis is a leading cause of bacterial sexually transmitted infections globally.
• Untreated infections can lead to severe long-term health consequences including infertility and increased cancer risk.
• Accurate and accessible diagnostic tools are crucial for effective management and control.

Purpose of the Study:

• To develop and evaluate a novel, rapid, and cost-effective point-of-care assay for Chlamydia trachomatis detection.
• To assess the assay's feasibility using crude DNA lysis and loop-mediated isothermal amplification (LAMP) with hydroxynaphthol blue.

Main Methods:

• Developed a one-step assay involving crude DNA lysis via heat treatment coupled with LAMP.
• Utilized six primers targeting the C. trachomatis ompA gene for specificity.
• Evaluated the assay on 284 endocervical swab specimens, comparing results to commercial DNA isolation and PCR methods.

Main Results:

• The assay demonstrated high sensitivity (90-100%) and specificity (95%), comparable to conventional PCR.
• Achieved detection of 0.04 pg of ompA DNA within a rapid 45-minute total assay time.
• Results are visually interpreted via a color change (violet to sky blue) and the assay costs approximately $3 USD per reaction.

Conclusions:

• The developed crude DNA lysis coupled LAMP assay is a simple, rapid, specific, sensitive, and cost-effective method for C. trachomatis detection.
• This assay presents a viable alternative for clinical diagnosis in resource-limited healthcare facilities and field settings.
• The assay utilizes safe reagents, ensuring user safety during testing.