Oligonucleotide hybridization with magnetic separation assay for multiple SNP phasing.

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Human genetics involves two copies of each gene, leading to variations in mutation inheritance.
• The arrangement of mutations on DNA strands (haplotype phase) influences protein expression.
• Understanding cis (same strand) and trans (different strands) configurations is vital for genetic analysis.

Purpose of the Study:

• To develop an enzyme-free method for determining the haplotype phase of two single nucleotide polymorphisms (SNPs).
• To differentiate between cis and trans configurations of SNPs using a novel probe-based assay.
• To provide a tool for analyzing complex genetic variations in a human genome context.

Main Methods:

• Utilized two fluorophore/quencher-labeled probes, one biotinylated, for SNP phasing.
• Employed a two-step fluorescence detection process involving probe addition and magnetic bead capture.
• Applied fluorescence microscopy and detection to differentiate haplotype pairs.

Main Results:

• The method successfully phases two single nucleotide polymorphisms (SNPs) without enzymes.
• A decrease in fluorescence signal indicates SNPs in a trans configuration, while a stable signal suggests cis.
• Successfully differentiated 250 nM of 10 possible haplotype pairs, mimicking human genome complexity.

Conclusions:

• The developed method offers an efficient, enzyme-free approach for haplotype phasing.
• This technique accurately distinguishes between cis and trans SNP configurations.
• The assay has potential applications in genetic research and diagnostics requiring precise haplotype determination.