Frequently Asked Questions

Welcome to our FAQ section! Here, you’ll find answers to the most commonly asked questions about our product, protocol and more. If you can’t find an answer, feel free to contact us below.

FAQ – Product

What is GeneAbacus?

GeneAbacus is a bundle of reagents, consumables and software for gene editing efficiency quantification. It contains everything you need to validate your gene edit.

What makes GeneAbacus unique compared to other technologies?

GeneAbacus utilizes the unique technology of padlock probes and rolling circle amplification to speed up and simplify the gene targeting validation process. This assay removes the need for PCR and can be done completely in-house with standard laboratory instrumentation. With GeneAbacus, you are able to bring extracted DNA to quantified data in under 5 hours, with minimal hands-on time and digital quantification precision.

How can I order a GeneAbacus kit?

You can request a quote directly on our website (https://countagen.com/quotation-form/) or email info@countagen.com and we will contact you.

How do I analyze the GeneAbacus outcome?

GAIA, short for GeneAbacus Image Analyzer, is a light-weight analysis software that quantifies signals and computes editing efficiency.

GAIA is available for macOS and Windows and included in the purchase of GeneAbacus.

What does the kit consist of?

There are two boxes that come with the GeneAbacus kit, one box containing the assay components (-20°C) and another box containing the readout components (+4°C storage).

What is the shelf life of GeneAbacus?

The kits have a 6 months shelf life from date of delivery.

Please store the different components at their recommended temperatures, as specified in the kit documentation and on each box.

How many reactions are in the kit?

The kit is enough for running 32 reactions. We recommend running samples in duplicate for mitigating laboratory errors.

What gene editing modalities can GeneAbacus validate?

GeneAbacus supports validation of TALENs over CRISPR-based modalities, such as Cas9, Cas12, base and prime editing, to programmable genomic integration (PGI). The GeneAbacus probes precisely target any DNA sequence of interest independently of the editor used.

FAQ – Protocol

How long does it take to run the protocol?

If you run the protocol consecutively, we recommend planning for 5 hours with less than 1 hours hands-on time.

What are the assay steps in the protocol?

The protocol consists of around 6 steps, starting with column-extracted genomic DNA, followed by rolling circle amplification, image acquisition and data analysis via GAIA.

Are there stopping points in the protocol?

Yes, the protocol contains several stopping points to offer flexibility, as noted in the protocol.

    Are there any controls included in the kit?

    There are two types of controls included in the kit. The first is a control of genomic DNA that can be used to confirm correct execution of the protocol. The other control is an internal probe included in the probe mix to validate the amount of genomic DNA and allow for sample normalization.

    What type of external controls do you recommend?

    It is always recommended to include control samples in the experimental design. Besides the edited samples, a wildtype sample has to be included in the analysis. Other controls might include non-sense sgRNA or lack of Cas.

    What is the minimum genomic DNA input?

    100 ng of DNA (column extracted) is recommended for each reaction. The DNA concentration of the sample should be equal or above 10 ng/µL.

    What sample type can you run on?

    GeneAbacus currently supports column purified DNA from human cell lines and mouse cells, tissue or model organism. The purity of the DNA should be that the 260/280 ratio is >1.7 and 260/230 ratio between 1.8 and 2.2.

    For further details or questions, please contact info@countagen.com or via the Contact Us form.

    Can you run on crude DNA extracts?

    The current version of GeneAbacus requires column purified DNA. Are you in need to run gene edit validation on crude DNA? Get in touch with us at info@countagen.com or via the Contact Us form, and we are happy to discuss.

    FAQ – Technology

    How does your technology compare to NGS-based amplicon sequencing?

    GeneAbacus has an excellent correlation of R^2=0.95 with amplicon sequencing (NGS + CRISPResso2).

    Can you run high GC content regions?

    Yes, the technology is well-suited for high GC content as well as low GC content regions, which are often considered difficult targets for PCR-based assays.

    Can it distinguish point mutations and base edits?

    Yes, it is a perfect match for the validation of precision edits as it relies on padlock probe chemistry.

    What is the lowest editing efficiency that GeneAbacus can quantify accurately?

    GeneAbacus can quantify editing analysis accurately above 10%.

    What is the specificity of the technology?

    Single mismatch discrimination accuracy of >95%.

    FAQ – Instrument

    What instruments do I need to run GeneAbacus?

    To run the GeneAbacus kit, only standard instruments like a thermal cycler and fluorescence microscope are required, which are available in a standard cell/molecular lab.

    For a complete list of required equipment and consumable for GeneAbacus, please contact info@countagen.com or via the Contact Us form.

    What are the epifluorescence microscope requirements?

    Standard epifluorescence microscopes can be used to read out GeneAbacus. A list of requirements can be found in the table below. Our team is happy to assist you with any questions you may have. Please contact info@countagen.com or via the Contact Us form.

    Microscope type Epifluorescence
    Fluorescence filter channels FITC, Cy3, Cy5
    Microscope objective 20x, NA>0.5, WD>0.6 mm
    Field of view 0.65 mm^2
    Resolution 1024×1024 minimum
    Pixel size 0.66 µm/pixel
    Light source LED
    System Upright or inverted

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