Programmable large-cargo integration: Overcoming size constraints for next-generation gene therapy.

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Base and prime editors offer precise genome editing without double-strand breaks (DSBs).
• These tools facilitate precise point mutations, insertions, deletions, and substitutions.
• Current limitations exist in efficiently inserting large DNA fragments (>1 kb) for correcting complex genetic mutations.

Purpose of the Study:

• To review novel strategies for efficient large DNA cargo insertion (>1 kb).
• To examine the applications, advantages, and limitations of these systems in bacterial and mammalian contexts.
• To identify persistent challenges and future research directions in large DNA insertion technologies.

Main Methods:

• Review of three recently developed strategies for large DNA insertion: CRISPR-associated Tn7-like transposases (CASTs), PE-integrase systems, and R2 retrotransposon fusions (nCas9-R2).
• Analysis of system applications in both bacterial and mammalian systems.
• Discussion of comparative advantages and current limitations of each system.

Main Results:

• CASTs, PE-integrase systems, and nCas9-R2 fusions demonstrate potential for efficient large DNA cargo insertion (>1 kb).
• These systems show applicability in both bacterial and mammalian cellular contexts.
• Each system presents unique advantages and limitations regarding efficiency, specificity, and cargo size.

Conclusions:

• Advanced genome editing systems are emerging to enable efficient large DNA fragment insertion.
• These technologies hold promise for advancing gene therapies and personalized genomic medicine by overcoming current limitations.
• Further research is needed to address persistent challenges and optimize these systems for broader clinical applications.