Communication: One-Step HLA-B*59:01 Genotyping by Real-Time Duplex Allele-Specific PCR and Melting Curve Analysis

Area of Science:

• Pharmacogenomics
• Molecular Diagnostics
• Immunogenetics

Background:

• HLA-B*59:01 is linked to severe cutaneous adverse reactions (SCARs) from carbonic anhydrase inhibitors.
• Conventional PCR genotyping for HLA-B*59:01 is labor-intensive due to post-PCR electrophoresis.

Purpose of the Study:

• To develop a rapid and reliable real-time PCR method for HLA-B*59:01 genotyping.
• To improve efficiency and reduce hands-on time for SCAR risk screening.

Main Methods:

• Developed a real-time duplex allele-specific PCR with melting curve analysis.
• Utilized KOD SYBR qPCR Mix to differentiate HLA-B*59:01 and GNAQ amplicons.
• Validated against sequence-based typing (SBT) using 150 samples.

Main Results:

• Achieved 100% concordance with SBT, demonstrating 100% sensitivity and specificity.
• The closed-tube assay eliminated the need for electrophoresis.
• Significantly reduced hands-on time compared to conventional methods.

Conclusions:

• The melting curve analysis offers a reliable and efficient alternative for HLA-B*59:01 screening.
• This method facilitates clinical implementation for SCAR risk mitigation.
• Enables faster identification of individuals at risk for adverse drug reactions.