Illegitimate translation causes unexpected gene expression from on-target out-of-frame alleles created by CRISPR-Cas9.

Abstract excerpt

CRISPR-Cas9 is efficient enough to knock out both alleles directly by introducing out-of-frame mutations. We succeeded in making biallelic on-target frameshift mutations of the endogenous Gli3 gene; however, the GLI3 protein was expressed in all six of the established cell lines carrying homozygous out-of-frame mutations. We developed a dual-tagged expression vector and proved that illegitimate translation (ITL)...

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