Homology-directed gene repair Sequence correction xx exogenous repair substrate Rad51… sister chromatids I-SceI.

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Homology-directed gene repair Sequence correction xx exogenous repair substrate Rad51… sister chromatids I-SceI

Homology-directed gene repair Sequence correction xx exogenous repair substrate Rad51… sister chromatids I-SceI

DRGFP reporter puro R I-SceISTOPBcgI puro R BcgI GFP + gene conversion CACA CACA

293T stable DRGFP (S8) no DNA pCMV-I-SceI 48 hrs 72 hrs

Direct Repeat Reporters: recombination in cis

293T DRGFP (cis) I-SceI DRGFP+I-SceI DRGFP

293T DRGFP-lacO (cis) DRGFPlacO DRGFPlacO+I-SceI

Exogenous Donor Reporter: recombination in trans

293T ZFGFP + iGFP (trans) ZFGFP+iGFPZFGFP+iGFP+I-SceI

293T ZFGFP-lacO + iGFP (trans) ZFGFP-lacOZFGFP-lacO+iGFP+I-SceI

Too Much DNA?

293T: Efficiency of Transient Transfection ng eGFP no DNA 1.0  g eGFP2.0  g eGFP4.0  g eGFP 62 ng eGFP125 ng eGFP250 ng eGFP

“Stable” DRGFP?

“Stable” DRGFP (puro S ) No DNA CMV-Sce 48 hrs73 hrs98 hrs

“Stable” DRGFP (puro R ) No DNA CMV-Sce 48 hrs73 hrs98 hrs

Plans Lines with integrated trans reporter –Enhance repair by tethering chromatin modifiers and repair factors Back to B-cells