How to Mitigate CRISPR-Cas9 Off-Target Effects: Evaluation of Current Detection, Prediction, and Mitigation Strategies

Abstract

One of the most efficient and powerful genome-editing instruments, CRISPR-Cas9 represents a high promise in treating disease and examining the genome. Nevertheless, its clinical translation is limited by off-target effects that cause harmful genomic mutations and potentially fatal safety issues. This review provides a thorough overview of the current state of knowledge on off-target causes, detection and prediction methods, and mitigation strategies. MAIN REASONSThese include mismatch tolerance of Cas9-gRNA and sustained expression associated with some delivery methods. Finally, the detection and prediction tools based on representative approaches such as GUIDE-seq, CIRCLE-seq, Cas-OFFinder and DeepCRISPR are evaluated and their advantages and limitations are listed. The mitigation strategies such as sgRNA engineering, Cas9 protein engineering and transient delivery systems are also discussed. The study argues that the data mentioned above only measures an important first step, and that the realization of clinically relevant detection models that reliably mimic in vivo conditions is critical to screening safety. This review integrates these dimensions, so as to offer a clear framework for controlling when, where and how. Integrating these dimensions allows this review to provide a clear framework for controlling when, where and how CRISPR-Cas9-mediated alterations occur afford systemic implementation strategies that improve the safety of CRISPR-Cas9 applications.