Comprehensive analysis of UGT1A1 polymorphisms through high-resolution melting analysis and DNA sequencing

Area of Science:

• Pharmacogenomics
• Molecular diagnostics
• Genetics

Background:

• Uridine diphosphate glucuronosyl transferase 1A1 (UGT1A1) is crucial for metabolizing bilirubin and irinotecan.
• UGT1A1 gene polymorphisms can influence drug efficacy and toxicity.
• Understanding UGT1A1 variants is vital for personalized medicine.

Purpose of the Study:

• To develop and validate a high-resolution melting (HRM) analysis for UGT1A1 gene screening.
• To identify known and novel UGT1A1 variants in a Taiwanese population.
• To assess the utility of HRM for rapid genetic analysis.

Main Methods:

• Genomic DNA extraction from peripheral blood of 110 healthy subjects.
• Screening of UGT1A1 promoter and 11 exons using HRM analysis.
• Confirmation of HRM findings via direct DNA sequencing.

Main Results:

• HRM analysis successfully identified 5 known UGT1A1 variants (c.211 G > A; G71R, c.686 C > A; P229Q, c.1091 C > T; c.-3279 T > G; and c.-3156 G > A).
• Eight novel UGT1A1 sequence variants were discovered (c.-3296 C > T; c.43 C > A; c.45 G > A; c.234 G > A; c.577 G > A; c.614 C > T; c.1011 T > C; and c.1352 C > T).
• Distinct HRM curve patterns allowed for easy differentiation of UGT1A1 variants.

Conclusions:

• HRM analysis provides a rapid and accurate method for UGT1A1 gene mutation screening.
• The technique is economical and suitable for clinical application.
• This aids in pharmacogenetic profiling for irinotecan and antiviral therapies.