The CRISPRaTest™ Functional dCas9-Activator Assay Kit (Cat.# CRATEST) is designed to measure the activity of dCas9 transactivator (e.g., dCas-VPH, dCas9-VPR) in most mammalian cell systems. The choice of kit CRISPRaTest™ or CRISPRaTest™ (EF1L), depends on the cell line to be tested. In iPS cells, where the CMV promoter used in the CRISPRaTest™ Kit is quickly silenced, the CRISPRaTest™ Kit (EF1L) is strongly recommended.

The CRISPR gene activation system (CRISPRa), a modification of the original CRISPR knockout system, uses a sgRNA molecule to direct a catalytic inactive Cas9 (dCas9) fused with a Transcriptional Activator (TA), to a target location on a gene promoter. The sgRNA-dCas9-TA complex then increases the expression levels of the gene transcribed from the targeted the promoter.

The CRISPRaTest Kit provides reagents to measure the activator strength of any Streptococcus pyogenes dCas9 transactivator (dCas9-TA) hybrid protein in cells designed to be used for CRISPRa experiments, using a simple FACS-based assay. The kit contains pseudoviral packaged lentiviral constructs with a green fluorescent protein (GFP) gene that increases in expression when expressed in cells with active dCas9-TA. The kit provides enough reagents to measure this activity in 5-15 cell lines.

References and Product Citations for all Cellecta products can be found on the Cellecta website:

Please read the entire user manual before proceeding with your experiment. Also, please note that, when working with pseudoviral particles, you should follow the recommended guidelines for working with Biosafety Level 2 (BSL-2) materials.

PLEASE NOTE: The purchase of all Cellecta Products is covered by Cellecta’s standard Terms and Conditions of Sale as described on Cellecta’s website, and selected Products containing particular technology or having certain features are also subject to restrictions on use as outlined in the Label License section of our website. Please review these Terms and Label License Restrictions before opening and using your Product and, if you are not able to abide by the restriction, contact Cellecta to return the item to Cellecta for a full refund.

Last modified: 17 May 2024

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