A Novel Fluorescent GFP Chromophore Analog-Based Dye for Quantitative PCR

Area of Science:

• Biochemistry
• Molecular Biology
• Analytical Chemistry

Background:

• Quantitative polymerase chain reaction (qPCR) relies on fluorescent dyes for detecting nucleic acid amplification.
• Traditional dyes like 6-FAM are widely used but alternatives are sought for improved performance or cost-effectiveness.
• Green fluorescent protein (GFP) chromophores offer unique photophysical properties.

Purpose of the Study:

• To evaluate the synthetic GFP chromophore analog, P-HOBDI-BF2, as a fluorescent dye for hydrolysis probes in qPCR.
• To assess the performance of P-HOBDI-BF2 in detecting the plant pathogenic fungus Fusarium avenaceum.

Main Methods:

• Synthesis and characterization of the P-HOBDI-BF2 dye.
• Labeling of linear hydrolysis probes with P-HOBDI-BF2, 6-FAM, and BDP-FL.
• Application of labeled probes in a qPCR system targeting Fusarium avenaceum DNA.
• Comparison of fluorescence intensity and assay sensitivity between P-HOBDI-BF2 and reference dyes.

Main Results:

• P-HOBDI-BF2 successfully functioned as a fluorescent dye in hydrolysis probes for qPCR.
• Probes labeled with P-HOBDI-BF2 exhibited slightly lower fluorescence increase compared to 6-FAM-labeled probes.
• Assays utilizing P-HOBDI-BF2 demonstrated high sensitivity in detecting Fusarium avenaceum.

Conclusions:

• The synthetic dye P-HOBDI-BF2 is a viable alternative reporter for hydrolysis probes in qPCR.
• Its high sensitivity makes it suitable for applications traditionally using FAM channel reporters.
• P-HOBDI-BF2 offers a promising option for fluorescent detection in molecular diagnostics.