Quantitative surface-enhanced Raman for gene expression estimation.

Area of Science:

• Biotechnology
• Molecular Biology
• Cancer Research

Background:

• Accurate quantification of gene expression, particularly alternative splicing, is crucial for understanding cancer biology.
• Existing methods often require amplification steps or lack the resolution to detect specific splice variants.
• Surface-enhanced Raman scattering (SERS) offers potential for sensitive molecular detection.

Purpose of the Study:

• To develop and validate a novel SERS-based gene expression assay for quantifying alternative splicing.
• To detect and quantify the expression levels of the BRCA1 splice junction Delta(9,10) in breast cancer cells.

Main Methods:

• Utilized nonfluorescent Raman labels with SERS substrates for gene expression quantification.
• Integrated S1 nuclease digestion with SERS detection to target specific RNA splice junctions.
• Extracted RNA from MCF-7 and MDA-MB-231 cancer cell lines.

Main Results:

• Successfully quantified the expression levels of the BRCA1 splice junction Delta(9,10) using the SERS assay.
• Achieved quantification without any amplification steps, demonstrating high sensitivity.
• Results were cross-validated using two Raman tags and confirmed qualitatively by RT-PCR.

Conclusions:

• The developed SERS-based assay provides a reliable and sensitive method for quantifying gene expression at the alternative splicing level.
• This approach bypasses the need for amplification and simplifies the detection of genetic materials.
• The methodology holds promise for advancing cancer diagnostics and research.