Precision Gene Editing Breakthrough: Autophagy-Induced Enhancement of Homologous Recombination

A groundbreaking study by a Korean research team has significantly enhanced the low efficiency of homologous recombination (HR)-based CRISPR-Cas9 gene editing by inducing autophagy, a natural process within cells. The technique, which was successfully validated in patient-derived cells and live animal models, has the potential to revolutionize gene therapies by providing a safer and more effective way to precisely rewrite faulty genetic sequences.

Key Takeaways:

• The Korean research team, led by Dr. Hye Jin Nam, has developed a novel method to enhance the efficiency of HR-based CRISPR-Cas9 gene editing up to threefold by inducing autophagy.
• Autophagy, a natural process within cells, was triggered through nutrient deprivation or mTOR inhibition, resulting in a 1.4 to 3.1 times increase in editing efficiency across various target genes and DNA insert sizes.
• The technique was successfully validated in patient-derived cells carrying genetic mutations and in live animal models, demonstrating its potential for therapeutic applications.
• Even alternate versions of CRISPR, such as nickase Cas9 (nCas9) and dead Cas9 (dCas9), showed improved editing performance under autophagic conditions.
• Further analysis revealed that autophagy enhanced the accumulation of HR-associated DNA repair proteins within the Cas9 complex, which may help direct repair activity toward more precise outcomes.
• The research team also tested the approach in mouse models, achieving a threefold improvement in editing efficiency in the mouse retina.

Statistics:

• The efficiency of HR-based editing increased by 1.4 to 3.1 times across various target genes and DNA insert sizes when autophagy was triggered.
• The technique resulted in a threefold improvement in editing efficiency in patient-derived cells carrying mutations in the MPZL2 gene-lined to hearing loss.
• The method led to an increased expression of the corrected gene up to threefold in patient-derived cells.
• The research team achieved a threefold improvement in editing efficiency in the mouse retina using autophagy induction.

Sources:

• Dr. Hye Jin Nam's team at the Korea Research Institute of Chemical Technology (KRICT), in collaboration with Professors Dong Hyun Jo and Sangsu Bae at Seoul National University College of Medicine.
• Published in Nucleic Acids Research (IF: 16.7) in April 2025.