Removal of TREX1 activity enhances CRISPR-Cas9-mediated homologous recombination.

ABSTRACT: CRISPR-Cas9-mediated homology-directed repair (HDR) can introduce desired mutations at targeted genomic sites, but achieving high efficiencies is a major hurdle in many cell types, including cells deficient in DNA repair activity. In this study, we used genome-wide screening in Fanconi anemia patient lymphoblastic cell lines to uncover suppressors of CRISPR-Cas9-mediated HDR. We found that a single exonuclease, TREX1, reduces HDR efficiency when the repair template is a single-stranded or linearized double-stranded DNA. TREX1 expression serves as a biomarker for CRISPR-Cas9-mediated HDR in that the high TREX1 expression present in many different cell types (such as U2OS, Jurkat, MDA-MB-231 and primary T cells as well as hematopoietic stem and progenitor cells) predicts poor HDR. Here we de

SUBMITTER: Karasu ME 

PROVIDER: S-EPMC12263433 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature