Ectopic expression of RAD52 and dn53BP1 improves homology-directed repair during CRISPR-Cas9 genome editing


Paulsen B. S. , Mandal P. K. , Frock R. L. , Boyraz B., Yadav R., Upadhyayula S., ...Daha Fazla

NATURE BIOMEDICAL ENGINEERING, cilt.1, ss.878-888, 2017 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 1 Konu: 11
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1038/s41551-017-0145-2
  • Dergi Adı: NATURE BIOMEDICAL ENGINEERING
  • Sayfa Sayıları: ss.878-888

Özet

Gene disruption by clustered regularly interspaced short palindromic repeats (CRISPR)-CRISPR-associated protein 9 (Cas9) is highly efficient and relies on the error-prone non-homologous end-joining pathway. Conversely, precise gene editing requires homology-directed repair (HDR), which occurs at a lower frequency than non-homologous end-joining in mammalian cells. Here, by testing whether manipulation of DNA repair factors improves HDR efficacy, we show that transient ectopic co-expression of RAD52 and a dominant-negative form of tumour protein p53-binding protein 1 (dn53BP1) synergize to enable efficient HDR using a single-stranded oligonucleotide DNA donor template at multiple loci in human cells, including patient-derived induced pluripotent stem cells. Co-expression of RAD52 and dn53BP1 improves multiplexed HDR-mediated editing, whereas expression of RAD52 alone enhances HDR with Cas9 nickase. Our data show that the frequency of non-homologous end-joining-mediated double-strand break repair in the presence of these two factors is not suppressed and suggest that dn53BP1 competitively antagonizes 53BP1 to augment HDR in combination with RAD52. Importantly, co-expression of RAD52 and dn53BP1 does not alter Cas9 off-target activity. These findings support the use of RAD52 and dn53BP1 co-expression to overcome bottlenecks that limit HDR in precision genome editing.