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Real Time RT-PCR

Real Time RT-PCR

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The real-time quantification of the number of amplified products is...

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Determination of the Duplicated CYP2D6 Allele Using Real-Time PCR Signal: An Alternative Approach.

Mazen A Atiq¹, Sandra E Peterson¹, Loralie J Langman¹

¹Department of Laboratory Medicine and Pathology, Mayo Clinic, 200 1st Street Southwest, Rochester, MN 55905, USA.

Journal of Personalized Medicine

|June 28, 2023

Summary

Visual inspection of real-time PCR plots can accurately identify duplicated CYP2D6 alleles in most cases. This targeted genotyping approach reduces the need for complex reflex sequencing, improving efficiency in pharmacogenomic testing.

Keywords:

CYP2D6 Sanger sequencing copy number variation duplications long-range PCR pharmacogenomics real-time PCR targeted genotyping

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Serum and Plasma Copy Number Detection Using Real-time PCR

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Area of Science:

Pharmacogenomics
Molecular Diagnostics
Genetic Testing

Background:

CYP2D6 gene duplication presents significant pharmacogenomic challenges.
Current methods like long-range PCR (LR-PCR) are used for genotype resolution in complex cases.
Accurate determination of duplicated CYP2D6 alleles is crucial for personalized medicine.

Purpose of the Study:

To evaluate the reliability of visual inspection of real-time PCR plots for determining duplicated CYP2D6 alleles.
To assess if targeted genotyping with copy number variation (CNV) detection can replace reflex sequencing in specific scenarios.
To compare the accuracy of visual plot assessment against established genotyping methods.

Main Methods:

Six reviewers visually assessed QuantStudio OpenArray CYP2D6 genotyping results and TaqMan Genotyper plots.
Seventy-three well-characterized cases with three copies of CYP2D6 and two different alleles were analyzed.
Reviewers determined the duplicated allele or opted for reflex sequencing, blinded to the final genotype.

Main Results:

Reviewers achieved 100% accuracy when reporting cases with three CYP2D6 copies.
Reflex sequencing was not requested in 67-92% of cases, with accurate duplicated allele identification.
Ambiguous cases or those with more than three copies were flagged for reflex sequencing.

Conclusions:

Visual inspection of real-time PCR plots with CNV detection is a reliable method for determining duplicated CYP2D6 alleles in most three-copy cases.
This approach can reduce the necessity for reflex sequencing, enhancing diagnostic efficiency.
LR-PCR and Sanger sequencing remain essential for complex cases involving ambiguous results or more than three CYP2D6 copies.