Photoactivatable CRISPR-Cas9 for optogenetic genome editing

Area of Science:

• Molecular Biology
• Optogenetics
• Genome Engineering

Background:

• CRISPR-Cas9 technology offers precise genome editing capabilities.
• Optogenetic tools allow for light-inducible control of biological processes.
• Integrating these technologies can enhance control over genome editing applications.

Purpose of the Study:

• To engineer a photoactivatable Cas9 (paCas9) system for optogenetic control of CRISPR-Cas9.
• To demonstrate light-inducible genome editing in human cells.
• To explore spatial control of genome editing using patterned light.

Main Methods:

• Engineered split Cas9 fragments fused with photoinducible dimerization domains (Magnets).
• Expression of paCas9 in human embryonic kidney 293T cells.
• Irradiation with blue light to induce dimerization and genome editing.
• Analysis of genome modifications via nonhomologous end joining and homology-directed repair.

Main Results:

• Successfully developed and demonstrated photoactivatable Cas9 (paCas9) in human cells.
• Blue light irradiation induced targeted genome modifications.
• Genome editing activity was reversible, switchable by light.
• Spatial patterns of genome editing were achieved through patterned light irradiation.

Conclusions:

• Optogenetic control of CRISPR-Cas9 genome editing is feasible using paCas9.
• This system allows for precise temporal and spatial regulation of gene editing.
• paCas9 holds potential for advancing research in gene networks and biomedical applications.