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Applied Biosystems™ PureQuant™ CD8+ T-Cell Assay

Applied Biosystems™ PureQuant™ assays are a family of assays that accurately identify and quantify specific immune cell types in a mixed population of cells.

Supplier:  Applied Biosystems™ A43674


Catalog No. A43674

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Assays are TaqMan qPCR-based and measure genomic DNA methylation at specific sites that serve as a unique identifier. The assays include standards and controls and each 96-well plate can accommodate up to seven test samples. Results are provided as a percentage of target cell type out of total input cells using a free analysis tool.

The PureQuant™ CD8+ T-Cell Assay utilizes the CD8B gene as an epigenetic marker for CD8+ T cells; the assay targets regulatory elements within its third intron

Benefits include:

  • Proven performance―core technology has been used for identification and quantification of immune cell types for over a decade
  • Easily standardized―qPCR method enables consistent results across multiple users, instruments, and sites
  • Facilitates regulatory filings―regulatory support file provided upon request; established performance specifications following ICHQ2(R1) guidelines
  • Scheduling flexibility―assay can be performed using fresh or frozen cells/gDNA

The assays include all reagents, standards, and controls required to run the assay. Specific components include:

  • Calibrator: Plasmid-based calibrator harbors the genomic target regions in equimolar ratios and includes GAPDH. Subjected to bisulfite conversion followed by copy number estimation via qPCR standard curve. Allows estimation of assay-specific bisulfite efficiency factor: the ratio between TpG/GAPDH copy numbers measured from the same plasmid.
  • Reference: checks assay performance. Consists of genomic DNA extracted from human blood of pooled healthy donors. The reference values represent the expected range of the target cell type. For example, CD8+ cells are generally more abundant than Treg or Th17 cells.
  • Standards: determine the unknown copy number. Consist of six dilutions spanning 4-log linear dynamic range (30-31250 copies). Absolute copy numbers can reliably be determined using the slope and intercept of the respective standard curves.

This product is manufactured at a site with an ISO9001-certified quality management system.



  • Dynabeads SILANE Genomic DNA Kit, store at 2°C to 8°CC
  • 1 x 2 mL PureQuant qPCR Master Mix, store at 2°C to 8°CC
  • 4 x ABS
  • THFA, store at room temperature
  • PureQuant CD8 Module, store at -15 to -25°C (CD8 & GAPDH TaqMan primers and probes, Reference DNA, Lambda DNA, Standard DNA)
Cells, DNA
Primer-Probe Detection
Approved for shipment at Room Temperature or on Wet or Dry Ice


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For Research Use or Manufacturing of Cell, Gene, or Tissue-Based Products. CAUTION: Not intended for direct administration into humans or animals.