Cell and Gene Therapy Resources

Cell and Gene Therapy

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Droplet Digital PCR Applications for Cell and Gene Therapy — Unrivaled Precision and Accuracy for Quality Manufacturing

Droplet Digital PCR (ddPCR) provides highly precise absolute quantification of nucleic acid sequences by counting nucleic acid molecules encapsulated in discrete, volumetrically defined water-in-oil droplet partitions. This digital measurement is suitable for the analysis of both in-process samples and final drug products due to the inhibitor tolerant nature of Droplet Digital PCR. This insensitivity to formulation matrices enables the implementation of Droplet Digital PCR throughout the entire manufacturing process. Bio-Rad's ddPCR systems utilize a simple workflow with minimal hands-on time while reducing sample replicates and user-to-user variability.

Droplet Digital PCR is GMP-ready, designed to meet production and Quality Control (QC) environment needs:

Regulatory edition software to assist with U.S. FDA 21 CFR Part 11 compliance
Installation qualification/operational qualification (IQ/OQ) service
Premier service offerings with rapid on-site support

Droplet Digital PCR Tools for Adeno-Associated Virus and Lentivirus Production in Gene Therapy

Developing effective and reproducible gene therapies requires the use of sensitive and robust testing methods, such as Droplet Digital PCR, to validate the quality of the therapeutic product. Bio-Rad's portfolio of ddPCR Viral Quantification solutions offers an accurate, precise, and robust method to measure the viral titer in a sample. Customers may also use some of these solutions to perform quality checks on incoming plasmids and conduct biodistribution studies.

Plasmid Quality
- Vector Backbone Assays
- Gene of Interest Assays
Viral Titer and Vector Copy Number
- Vector Backbone Assays
- Gene of Interest Assays
Contaminant Testing
- Mycoplasma Detection
- Residual DNA Supermix
- Host Cell DNA HEK293 Quantification and sizing
Biodistribution and Patient Monitoring
- Vector Backbone Assays
- Gene of Interest Assays

ddPCR Assays for AAV Viral Titer Quantification

Design Your Assay

Bio-Rad's Droplet Digital PCR (ddPCR) Assays for AAV viral titer utilize the precision and sensitivity of ddPCR technology to deliver an absolute count of AAV vector genome copies in your sample. These assays can be ordered through the Cell and Gene Therapy Design Engine and come in two varieties:

Custom ddPCR Cell and Gene Therapy Assays generated for target gene of interest
Ready-to-order ddPCR Expert Design Assays for common viral vector and plasmid elements

Learn more about ddPCR products for AAV Gene Therapy

Droplet Digital PCR Tools for CAR-T Development and Monitoring in Cell Therapy

Development, validation, and implementation of robust and accurate methods are vital to test the safety and efficacy of gene-modified cell therapies, such as Chimeric Antigen Receptor T (CAR-T) cells. Droplet Digital PCR offers absolute quantification of transgene copy number in a sample. This method can be used to effectively quantify CAR copy numbers in transfected or transduced T cells or count the number of cells that contain the transgene of interest. This is especially important for transgenes that cannot be detected by antibodies. The ddPCR Whole Cell DNA Workflow is a reproducible and easy way to measure the percentage of edited cells with minimal input cells and can be applied at multiple steps during the cell therapy manufacturing process.

Vector Copy Number
- Axi-cel Assay
- Axi-cel and Tisa-cel Universal Assay
Percent Modified Cells
- Whole Cell DNA Workflow
- Axi-cel Assay
- Axi-cel and Tisa-cel Universal Assay
Contaminant Testing
- Mycoplasma Detection
- Residual DNA Supermix
- Host Cell DNA HEK293 Quantification and sizing
Biodistribution and Patient Monitoring
- Axi-cel Assay
- Axi-cel and Tisa-cel Universal Assay

The ddPCR Whole Cell DNA Workflow:

Accurately measure the percentage of modified cells at the DNA level
Does not require surface expression or cell staining
Robust and sensitive detection enables low input cell requirement (100–1,000 cells)
Easy, reproducible workflow and analysis makes it a scalable solution

ddPCR Assays and Resources for CAR-T Cell Therapy

ddPCR Whole Cell DNA Workflow

Purchase the Enhancer Reagent A to enable the ddPCR Whole Cell DNA Workflow and accurately count modified cells.
In-vivo monitoring of CAR-T cells using sensitive Droplet Digital PCR Webinar

Learn about how Dr. Fehse uses ddPCR as a tool to monitor infused CAR-T cells in real-time using samples from patients.
Accurate In-Vivo Quantification of CD19 CAR-T Cells Using Digital PCR

Read about a novel digital PCR assay developed to monitor Tisa-Cel and Axi-cel CAR-T cells in patient samples.
CD19 CAR-T ddPCR Expert Design Assay

Order the CD-19 CAR-T specific assay for the detection of Axi-cel or Tisa-cel transgene DNA as described in Dr. Fehse's research.
Droplet Digital PCR (ddPCR) Is Well Suited for Quantifying Transgene Copy Number

Read about how ddPCR enables you to quantify your CAR T transgene copy number.

Learn about ddPCR products for CAR-T Cell Therapy

Contaminant Testing in Cell and Gene Therapy

Mycoplasma Detection

Cell lines and patient samples are prone to outbreaks of various mycoplasma infections; therefore, it is essential to address outbreaks as soon as they occur through robust testing. The Vericheck ddPCR Mycoplasma Detection Kit is a probe-based, highly sensitive and specific mycoplasma detection solution. This kit is designed and validated to meet European, U.S. and Japanese pharmacopoeia requirements. Detect up to 112 mycoplasma species using droplet digital PCR. Utilize the regulatory 21 CFR Part 11 compliant software to easily analyze and report your data.

DNA helix centered over a magenta vector of mycoplasma

Vericheck ddPCR Mycoplasma Solution

Verify mycoplasma presence/absence with absolute quantification
Reduce variability, plate-to-plate and user-to-user, giving highly reproducible results
Lower cross reactivity with related species, providing low false positive results.

The Vericheck ddPCR Mycoplasma Detection Kit is now available.

Residual Host DNA Quantification

Residual DNA content is a common impurity in cell and gene therapy manufacturing, and levels must be carefully monitored for lot release. Droplet Digital PCR is a precise and sensitive method for direct quantitation of residual DNA content. Since Droplet Digital PCR does not rely on reaction efficiency for quantitation, it is less prone to sample interference from complex matrices and process intermediates.

Droplet Digital PCR provides a highly sensitive method for direct quantification of residual HCD to ensure adherence to the FDA guideline of <100 pg/dose.

ddPCR Host Cell DNA Workflow

No DNA purification required
Inhibitor tolerance to in-process low pH and high salt sample matrices
Optimized supermix free of detectable E. coli, Chinese Hamster Ovary (CHO), mouse, human, and yeast DNA are available

Vericheck ddPCR HEK293 Residual DNA Quantification Kit

Residual DNA from HEK293 lines can harbor tumorigenic genetic sequences or retroviral sequences that could be transmitted through the biotherapeutic to the human recipients. Accurate quantification of HEK293 DNA is essential to produce a safe and appropriate therapeutic dose.

The Vericheck ddPCR HEK293 Residual DNA Quantification Kit, with a novel ddPCR assay, has been designed to quantify residual HEK293 DNA in biotherapeutics with high specificity and reproducibility, without the need for reference curves.

The Vericheck ddPCR HEK293 Residual DNA Quantification Kit is now available.

Vericheck ddPCR HEK293 Residual DNA Size Kit

Human gene therapy products are produced in immortalized cell lines, most commonly HEK293. Residual DNA from immortalized cell lines can harbor tumorigenic genetic sequences or retroviral sequences that can cause infection. The FDA recommends that manufacturers degrade any residual DNA to a size below that of a functional gene, defined as <200 base pairs. Manufacturers require an inexpensive, accurate, and reliable way of measuring the size of residual DNA, which ddPCR technology can provide.

The Vericheck ddPCR HEK293 Sizing Kit is the first HEK293 specific ddPCR based sizing solution that has been designed, and validated to meet regulatory guidance requirements and capable of measuring HEK293 size without the use of reference curves.

The Vericheck ddPCR HEK293 Residual DNA Size Kit is now available.

Cell and Gene Therapy Resources