Rapid F508del and F508C assay using fluorescent hybridization probes

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Cystic fibrosis is a genetic disorder caused by mutations in the cystic fibrosis transconductance regulator (CFTR) gene.
• Accurate and rapid genotyping for CFTR mutations, such as the common F508del, is crucial for diagnosis and research.

Purpose of the Study:

• To develop and validate a fast, fluorescent hybridization probe-based method for genotyping the F508del mutation in the CFTR gene.
• To assess the utility of this technique for detecting other sequence alterations.

Main Methods:

• Human genomic DNA was amplified and genotyped using adjacent fluorescent probes (fluorescein and Cy5) monitored by resonance energy transfer.
• Hybridization temperatures (Tm) were analyzed during controlled heating and cooling cycles.
• Genotypes were validated using allele-specific amplification.

Main Results:

• The method achieved genotyping in under 30 minutes with high accuracy for the F508del mutation in 105 samples.
• Characteristic Tm curves were obtained for each genotype.
• An unexpected F508C variant was detected, demonstrating the method's ability to identify sequence alterations.

Conclusions:

• Fluorescent monitoring of hybridization probes offers a versatile and rapid approach for CFTR genotyping.
• This technique can effectively detect both known mutations and novel sequence variations.
• The method provides a valuable tool for cystic fibrosis genetic analysis.