Enhancing Cell Line Stability by CRISPR/Cas9-Mediated Site-Specific Integration Based on Histone Modifications.

Area of Science:

• Biotechnology
• Molecular Biology
• Genomics

Background:

• Traditional cell line development relies on random transgene integration, often leading to epigenetic silencing and unstable gene expression.
• This necessitates costly and time-consuming stability studies to ensure reliable recombinant protein production.

Purpose of the Study:

• To develop a protocol for identifying and utilizing epigenetically favorable genomic sites for stable transgene integration.
• To enable robust and consistent gene expression in engineered cell lines using site-specific integration.

Main Methods:

• Chromatin immunoprecipitation sequencing (ChIP-seq) to identify regions with active chromatin structure.
• CRISPR/Cas9 gene editing to achieve site-specific integration of transgenes.
• Nanopore sequencing for targeted analysis of Cas9 integration sites.

Main Results:

• Successfully identified specific genomic loci with advantageous epigenetic properties for transgene insertion.
• Demonstrated stable and strong gene expression from transgenes integrated at these targeted sites.
• Developed a comprehensive protocol applicable to cell line engineering.

Conclusions:

• Site-specific integration via CRISPR/Cas9 offers a superior alternative to random integration for achieving stable gene expression.
• This approach significantly reduces the need for extensive stability testing in cell line development.
• The described protocol provides a robust method for enhancing cell line engineering efficiency and reliability.