Custom Cell Based Screening Kit for NHEJ: Allows Customer to Create a Cell Line Host for an NHEJ Reporter



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Product Info

This kit contains reagents necessary to create a complete NHEJ reporter system in any animal cell line.  It includes the NHEJ-GFP reporter with a selectable marker and a DS DNA cleavage nuclease to initiate DNA repair.  Because GFP is a neutral gene reporter and not subject to selection, DNA repair can easily be examined and assayed by assessing the %GFP or GFP intensity in a population of cells.  The system is mobile in that it can put into any cell lineage (or other species) to adapt to the investigators system of study. The kit also contains a control cell line (iHN-HeLa) that has the NHEJ-GFP reporter and a Tet-on promoter for I-Sce1.  NHEJ is conveniently activated by simply adding doxycycline to the media.  It serves as a control line and will help the investigator establish his own unique reporter line quickly and efficiently.

Shipping + Storage

Customers may request receiving a reporter cell line ready for culture (shipped at ambient temperature). The cells can be stored at 4° C for no more than one week before plating. Other reagents should be stored at 4° C (short term) or -20° C (long term) upon receipt. Customers may also request frozen cells, which must be placed in ultra-low freezer (-80° C) or in liquid nitrogen storage, until ready for use.


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This system has been designed to allow researchers to examine and interrogate NHEJ in live cells, in real time. We designed this kit to allow the customer to place the NHEJ into a cell of his or her choosing.  To illustrate how the system works, we used an inducible I-Sce1 gene in a HeLa cell line (iHN-HeLa, included in the Kit).  In these cells, NHEJ is conveniently activated by inducing the I-Sce1 gene under a Tet-on promoter (Fig. 1A).  The GFP-NHEJ reporter contains GFP with a disrupting intron that kills the gene  and renders the cells GFP negative.  The intron is flanked by two I-Sce1 cleavage sites.  After I-Sce1 DS DNA cleavage, incompatible end configurations are formed which are repaired by NHEJ (HR is not possible since a homologous sequence is missing).  The basic assay screens for GFP+ cells that form when NHEJ faithfully restores the wild type sequence (Fig. 1B).  The induction of I-Sce1 by Dox is rapid and efficient (all cells will express); however, NHEJ takes place more slowly over a period of several days, and only a small fraction of cells repair the GFP gene in an fashion that allows expression of GFP. In addition, one can use single cell imaging to follow individual GFP+ cell clones over time.  This allows one to track a progenitor cell (or the 1st GFP+ cell, see Fig. 1D) and all descendants at a single cell level, if desired.