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Integrated amplification microarray system in a lateral flow cell for warfarin genotyping from saliva.

Thomas Sebastian1, Christopher G Cooney1, Jennifer Parker1

  • 1Akonni Biosystems, Inc., 400 Sagner Avenue, Suite 300, Frederick, MD 21701, United States.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|December 24, 2013
PubMed
Summary

This study presents a simplified microarray method for warfarin sensitivity genotyping using saliva samples. The new assay offers a fast and accurate way to determine genetic variations affecting warfarin response.

Keywords:
CYP2C9Lateral flow cellMicroarrayPCRSNPSalivaVKORC1Warfarincytochrome P-450 variant 2C9polymerase chain reactionsingle-nucleotide polymorphismvitamin K epoxide reductase complex-1

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Area of Science:

  • Pharmacogenomics
  • Molecular Diagnostics
  • Biotechnology

Background:

  • Warfarin sensitivity is influenced by genetic polymorphisms in CYP2C9 and VKORC1 genes.
  • Accurate warfarin dosing requires understanding individual genetic predispositions.
  • Current genotyping methods can be complex and time-consuming.

Purpose of the Study:

  • To develop and demonstrate a simplified workflow for warfarin sensitivity genotyping.
  • To utilize gel element microarray technology for efficient genetic analysis.
  • To integrate sample collection, analysis, and detection into a streamlined process.

Main Methods:

  • Developed an integrated amplification microarray system within a closed-amplicon lateral flow cell.
  • Combined saliva nucleic acid extraction (TruTip technology) with the lateral flow cell assay.
  • Utilized automated array detection and analysis for genotyping single nucleotide polymorphisms (SNPs).

Main Results:

  • Assay demonstrated sensitivity down to 330 input genomic copies (1 ng) using DNA samples.
  • Pre-clinical evaluation with 65 blinded saliva samples showed results consistent with bidirectional sequencing.
  • The method successfully genotyped three SNPs influencing warfarin response.

Conclusions:

  • The developed microarray test provides a simple and fast sample-to-answer solution for warfarin sensitivity genotyping.
  • Integration of non-invasive saliva samples, rapid DNA extraction, and automated analysis enhances usability.
  • This technology offers a promising approach for personalized warfarin therapy.