Amplification-free gene expression analysis of formalin-fixed paraffin-embedded samples using scanning...

Area of Science:

• Molecular Biology
• Biotechnology

Background:

• Accurate RNA detection is crucial for gene expression analysis.
• Existing methods like real-time PCR often require amplification and can be affected by sample quality.

Purpose of the Study:

• To introduce and evaluate a novel, highly sensitive fluorescent detection method: scanning single-molecule counting (SSMC).
• To demonstrate the application of SSMC for amplification-free gene expression analysis, including in FFPE samples.

Main Methods:

• Development of a highly sensitive fluorescent detection method, scanning single-molecule counting (SSMC).
• Integration of SSMC with a magnetic bead-based assay (MB-BA + SSMC) for enhanced sensitivity.
• Application of MB-BA + SSMC for gene expression analysis without reverse transcription or amplification.
• Testing MB-BA + SSMC on formalin-fixed paraffin-embedded (FFPE) samples.

Main Results:

• MB-BA + SSMC detected target RNA with high sensitivity at 384 aM.
• Gene expression patterns obtained via MB-BA + SSMC were identical to real-time PCR.
• MB-BA + SSMC analysis of FFPE samples showed minimal impact from RNA fragmentation and crosslinking.
• FFPE samples analyzed by real-time PCR showed increased Ct values and decreased detectable genes.

Conclusions:

• SSMC is a powerful tool for highly sensitive target RNA detection.
• SSMC enables accurate, amplification-free gene expression analysis.
• MB-BA + SSMC is effective for analyzing RNA in FFPE samples, overcoming limitations of traditional methods.