A reverse transcription loop-mediated isothermal amplification assay optimized to detect multiple HIV subtypes.

Area of Science:

• Molecular Diagnostics
• Virology
• Bioinformatics

Background:

• Efficient point-of-care diagnostics for HIV RNA are crucial, especially in resource-limited settings.
• Existing reverse-transcription loop-mediated isothermal amplification (RT-LAMP) assays detect limited HIV subtypes.
• Optimized primers are needed for broader HIV RNA detection.

Purpose of the Study:

• To develop and validate novel RT-LAMP primers for detecting a wider range of HIV RNA subtypes.
• To establish a sensitive and specific diagnostic assay for HIV RNA at the point-of-care.

Main Methods:

• Bioinformatic analysis was used to design optimized RT-LAMP primers.
• 44 new primer sets were empirically tested for HIV RNA detection.
• Sensitivity and subtype coverage were evaluated using fluorescence-based DNA detection.

Main Results:

• A novel primer set (ACeIN-26) targeting the HIV integrase coding region demonstrated consistent detection of HIV subtypes A, B, C, D, and G.
• The assay exhibited sensitivity down to 5000 copies per reaction for these subtypes.
• Subtype F detection was unreliable, and subtype E was not tested.

Conclusions:

• The developed RT-LAMP assay provides a sensitive and broad-subtype detection method for HIV RNA.
• This assay has potential applications in monitoring treatment response, neonatal screening, and early infection detection.
• Further optimization may be needed for comprehensive subtype coverage and improved reliability.