Lineage tracing of LGR5+ CRCs in human colorectal xenografts

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Lineage tracing of LGR5+ CRCs in human colorectal xenografts Lineage tracing of LGR5+ CRCs in human colorectal xenografts Design of the donor vector containing lineage‐tracing cassette and AAVS1 homology arms.Design of LGR5‐CreERT2 donor and CRISPR/Cas9 sgRNA vectors.Flow cytometry analysis of double knock‐in PDO#7 carrying AAVS1‐LSL‐TOM and LGR5‐CreERT2 cassettes. Organoids were treated in vitro with 1 μM 4‐hydroxytamoxifen (4‐OHT). About 3.6% of the cells recombined the stop cassette (i.e., expressed low levels of mTagBFP2) and gained expression of TOM.Confocal imaging of double knock‐in organoids 10 days after in vitro 1 μM 4‐OHT addition. Scale bars indicate 50 μm. Note that recombined organoids switch mTagBFP2 to TOM expression.Experimental setup used for lineage‐tracing experiments.Representative immunohistochemistry using anti‐Tomato antibodies on paraffin sections of the four time points after tamoxifen treatment. Arrowheads point to single and two cell clones. Dashed lines delimit large clones. Scale bars indicate 250 μm.Clone size frequency per time point according to number of cells. Number of clones quantified was 878 for day 4, 2,424 for day 14, 6,940 for day 28, and 6,940 for day 56.Correlation of number of epithelial cells per xenograft and number of cells per clone over time (n = 4 xenografts for 4 days time point, n = 5 xenografts for 14 days time point, n = 8 xenografts for 28 days time point, n = 8 xenografts for 56 days time point).Expression domains of TOM and differentiation markers MUC2 and KRT20. White arrowheads indicate double‐positive cells. Scale bars indicate 100 μm.Quantification of the number of MUC2+ and KRT20+ cells within TOM+ clones at each time point. Data is represented as the 95% confidence intervals of the measurements. Number of clones assessed was 872 (4 days), 372 (day 14), and 69 (day 28) for KRT20 and 387 (day 4), 611 (day 14), and 130 (day 28) for MUC2. The P‐value was calculated using a generalized linear model with binomial response. ***P‐value < 0.005, ****P‐value < 0.0001. The exact P‐values are specified in Appendix Table S5. Carme Cortina et al. EMBO Mol Med. 2017;emmm.201707550 © as stated in the article, figure or figure legend