Advances in site-specific knock-in techniques for gene editing

Area of Science:

• Molecular Biology
• Genetic Engineering
• Gene Therapy

Background:

• Conventional gene targeting methods face challenges with unpredictable integration and low efficiency.
• Off-target activity and inefficiency have limited the practical application of gene knock-in technology.

Purpose of the Study:

• To review advancements in site-specific recombinase and nuclease systems for precise gene knock-in.
• To discuss strategies for genomic safe harbor site selection and the use of multi-omics data.
• To compare the efficacy of different gene editing systems like twinPE+Bxb1 and PASTE.

Main Methods:

• Systematic review of site-specific recombinase (e.g., Bxb1 integrase) and programmable nuclease (e.g., CRISPR/Cas9) systems.
• Analysis of Cas9-Bxb1 integrase system for large DNA fragment (5-43 kb) integration into genomic safe harbor sites.
• Comparison of twinPE+Bxb1 and PASTE gene editing platforms.

Main Results:

• Site-specific recombinase and nuclease systems significantly improve precision and efficiency of gene knock-in.
• The Cas9-Bxb1 integrase system facilitates targeted integration of large DNA fragments into genomic safe harbor sites.
• Multi-omics data can optimize predictive models for gene editing outcomes.

Conclusions:

• Gene-targeted knock-in technology is advancing rapidly, offering new possibilities for disease modeling, functional genomics, and therapeutics.
• Future research should focus on developing novel integrases, refining double-strand break-free editing, and creating cross-species genomic safe harbor databases.
• These advancements are crucial for progress in precision medicine and synthetic biology.