Below you'll find a complete list of the most frequently asked questions relating to our Isogenic Cell Lines. For questions relating specifically to HAP1 cells please see our HAP1 FAQ page.
Horizon's Cell Lines are genetically engineered cell pairs containing defined genomic modifications, providing a model system for the study of the role of genes in cellular processes and drug responses. Cell lines are provided with a matched wild type control parental cell line ensuring phenotypes can be attributed directly to the genotype.
Using Horizon’s Cell Lines you can:
Cell lines are provided as isogenic pairs – the modified mutant line and the originating wild type parental line.
All Horizon's Cell Lines are validated by PCR amplification and Sanger Sequencing to confirm the mutation at the genomic level. Cell lines generated using rAAV are also subjected to an additional digital PCR validation step. To enable you to verify our results, we can provide our sequencing result, including primer sequences.
Our cell lines are shipped on dry ice but should be stored in standard mammalian cell culture storage conditions using liquid nitrogen for long-term storage.
The cells do not need to be maintained in selection as the mutation is permanent, and the cell line is clonal.
We follow strict bio-banking procedures and our cells are regularly tested for contamination, including mycoplasma.
Our Terms and Conditions allow for 1 free of charge replacement vial within two months of receiving the cell line. We recommend the cells are expanded and you freeze stock immediately to avoid being charged for replacement line in the future.
We freeze 1 x 106 cells per vial as our standard practice.
If available, a reference for the mutant cell line is provided on the product page.
All modifications are validated by sequencing at the genomic level, but because every gene, protein and functional readout is different, it is not practical to assess them all. Forgoing functional validation allows us to keep cell line costs down.
We recommend validating the protein expression by Western blot or equivalent.
If you have any concerns about our Cell Lines, please contact us.
The primer sequences used for our internal genomic validation are provided on the Certificate of Analysis and Datasheet provided with the cell lines. We do not provide the PCR reaction conditions as these should be optimized within your own laboratory.
The ultimate proof that a cell line does not express the gene of interest is protein expression analysis by Western blot or similar. Unfortunately, due to the costs and time involved in optimising any new antibody, Horizon cannot test protein expression in all its cell lines. As such we recommend that protein expression is assessed in cell lines prior to proceeding with downstream experiments.
Please contact us if a HAP1 knockout cell line retains gene expression as detected by Western blotting.
We do not monitor the morphology or growth rates of the cells during the gene editing and banking so we cannot provide in-house data for these parameters. If you would like advice, please contact us and our Technical Support team would be happy to discuss your findings with the in-house scientists.
We request that you send an image of the Western blot along with details of your experimental design to email@example.com for evaluation. We can then arrange for the shipment of an alternative clone if available or restart the gene engineering to target a different exon of the same gene.
With all of the cell lines, we carry out genomic validation via sequencing/PCR to confirm the presence of the mutation. We do not perform functional validation.
In this case please contact firstname.lastname@example.org and we may be able to suggest a clone in another cell line.