Figure 1.
A cell-cycle tailored genome editing system to enhance HDR. The NHEJ pathway dominates DSB repair in G1 and G2 whereas HDR activity peaks in mid-S phase. The Cas9-hGem(1/110) fusion protein is subjected to proteolytic destruction during G1, but its expression is restored in S/G2/M. This partially synchronizes genome editing with HDR activity and enhances rates of the latter.