Preparation of reference material for UGT1A1 (TA)n polymorphism genotyping

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Gilbert's syndrome is a common metabolic disorder characterized by mild unconjugated hyperbilirubinemia.
• It results from reduced activity of the UDP-glucuronosyltransferase (UGT1A1) enzyme.
• UGT1A1 genotyping is crucial for differential diagnosis and personalized medicine.

Purpose of the Study:

• To develop plasmid-based reference materials for UGT1A1(TA)n genotyping.
• To create reliable tools for accurate polymorphism analysis.

Main Methods:

• Recombinant DNA technology was used to generate plasmids.
• Sanger sequencing verified plasmid sequences and repeat numbers.
• Capillary electrophoresis and denaturing high-performance liquid chromatography assessed suitability as reference materials.

Main Results:

• Plasmids representing all four common human UGT1A1 alleles ((TA)5, (TA)6, (TA)7, (TA)8) were successfully created.
• A plasmid with (TA)4 repeats was also generated.
• These plasmids accurately reflect the UGT1A1(TA)n polymorphism.

Conclusions:

• The developed plasmid reference materials enable the creation of all UGT1A1(TA)n polymorphism genotypes.
• These materials serve as an effective substitute for human genomic DNA in routine genotyping.
• They are valuable for developing new genotyping assays and improving diagnostic accuracy.