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Related Concept Videos

Real Time RT-PCR02:57

Real Time RT-PCR

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Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Related Experiment Video

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Measuring Single-Cell Mitochondrial DNA Copy Number and Heteroplasmy Using Digital Droplet Polymerase Chain Reaction
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CYP2D6 copy number determination using digital PCR.

Wendy Y Wang1, Lancy Lin2, Erin C Boone1

  • 1Division of Clinical Pharmacology, Toxicology and Therapeutic Innovation, Children's Mercy Research Institute (CMRI), Kansas City, MO, United States.

Frontiers in Pharmacology
|August 29, 2024
PubMed
Summary
This summary is machine-generated.

This study validates the Absolute Q platform for accurate CYP2D6 copy number variation testing, offering a streamlined and economical protocol for guiding drug therapy. The optimized method reliably detects structural variants, improving pharmacogene testing efficiency.

Keywords:
Absolute QCYP2D6One-potcopy number variationdigital PCRmultiplexquantitative PCRreference gene

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Area of Science:

  • Pharmacogenomics
  • Molecular Diagnostics
  • Genetic Testing

Background:

  • CYP2D6 gene testing is crucial for personalized drug therapy.
  • Detecting structural variants (SVs) in CYP2D6, including deletions, duplications, and hybrids, presents a significant challenge.
  • Accurate methods are needed to determine CYP2D6 copy number variation (CNV) and guide pharmacogenetic testing.

Purpose of the Study:

  • To validate the Absolute Q platform for digital PCR-based CYP2D6 CNV determination.
  • To compare the Absolute Q platform with the established QX200 platform for CYP2D6 CNV analysis.
  • To establish and validate streamlined protocols for CYP2D6 CNV testing, including a "One-pot" digestion method and multiplexing assays.

Main Methods:

  • Genomic DNA samples (n=30) from Coriell and various tissues were tested on Absolute Q and QX200 platforms.
  • Custom TaqMan™ copy number (CN) assays targeting CYP2D6 5'UTR, intron 6, and exon 9 regions were multiplexed with a reference gene assay.
  • Two digestion methods (One-pot and traditional) were assessed, and inconclusive results were resolved using alternate reference genes or DNA dilution.

Main Results:

  • Results from the Absolute Q and QX200 platforms were consistent across different digestion methods.
  • The "One-pot" digestion and multiplexing of three CYP2D6 regions reliably detected up to 6 gene copies across diverse sample types.
  • Rare variations in reference genes were identified as potential interferents, which were successfully resolved by using alternative reference genes.

Conclusions:

  • The Absolute Q platform provides accurate and reliable CYP2D6 copy number results.
  • Streamlined protocols utilizing "One-pot" digestion and multiplexing enhance the efficiency and economy of CYP2D6 CNV testing.
  • These validated protocols are being expanded for application to other pharmacogenes with structural variants and CNVs.