Hygromycin selection through use of a surrogate reporter system enriches nuclease-induced mutant cells.

<p>(A) Enrichment of GFP⁺ cells after hygromycin selection. Scale bar = 50 µm. (B) ZFN-driven mutations detected by the T7E1 assay. Arrows indicate the expected positions of DNA bands cleaved by mismatch-sensitive T7E1. The numbers at the bottom of the gel indicate mutation percentages calculated by band intensities. (C) DNA sequences of the wild-type (WT) and mutant clones, with ZFN recognition sites underlined. Dashes indicate deleted bases, and small bold letters indicate inserted bases. The number of occurrences is shown in parentheses; X1, X2, and X3 indicate the number of times that each clone was detected. Mutation frequencies were calculated by dividing the number of mutant clones by the number of total clones.