CRISPR engineered mouse embryonic stem cells with Sox2-tdTomato and Gata6-GFP knock-in for endoderm differentiation.

An Embryonic stem line was engineered with CRISPR mediated knock-in to tag the endogenous locus of Sox2 with tdTomato and Gata6 with GFP. The site-specific knock-ins were genotyped by PCR and DNA sequencing. The timely expression of Gata6 and loss of Sox2 upon differentiation in cells and Embryoid bodies (EBs) were studied by microscopy. The GFP and tdtomato expressing population from day 4 EBs showed exclusive expression of GATA6 and SOX2 protein, confirming the appropriate expression of the fluorescent reporters in the cell line.