Beyond typical HDR donor DNA design, we also offer Cas9 Targeting Sequence (CTS) added ssDNA and dsDNA design for improved gene knock-in efficiency. CTS allows for the co-delivery of donor DNA and sgRNA/Cas9 complex into the nucleus target gene site, therefore increasing HDR rate. In our collaboration with Dr. Marson at Gladstone and UCSF2, GenExact™ ssDNA with CTS design (delivered via electroporation) consistently outperformed in-house generated HDR templates, showing lower levels of toxicity and knock-in efficiency of 46.2% at a GMP-compatible scale. More info for CTS design can be found in this
paper.
Brian R Shy. et.al., bioRxiv(2021), Read the whole
article.