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Updated: Jul 27, 2025
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Generation of Genomic Deletions in Mammalian Cell Lines via CRISPR/Cas9
Published on: January 3, 2015
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Generation of Amber Suppression Cell Lines Using CRISPR-Cas9.
Birthe Meineke1, Simon J Elsässer2
1Laboratory of Synthetic and Systems Biology, Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Division of Genome Biology, Karolinska Institutet, Solna, Stockholm, Sweden. birthe.meineke@scilifelab.se.
Methods in Molecular Biology (Clifton, N.J.)
|June 5, 2023
Summary
This study details a CRISPR-Cas9 method for creating stable cell lines that efficiently incorporate noncanonical amino acids (ncAAs) into proteins. This genetic code expansion technology enables site-specific protein modification in mammalian cells.
Area of Science:
- Biochemistry
- Molecular Biology
- Synthetic Biology
Background:
- Genetic code expansion enables site-specific protein modification with noncanonical amino acids (ncAAs).
- The Methanosarcina mazei pyrrolysine-tRNA/synthetase (Mma PylT/RS) pair facilitates ncAAs incorporation in mammalian cells.
- ncAAs allow for advanced applications like click chemistry and photo-cage control.
Purpose of the Study:
- To develop a general protocol for generating CRISPR-Cas9 knock-in cell lines for genetic code expansion.
- To establish stable mammalian cell lines for efficient amber suppression using the Mma PylT/RS system.
- To integrate the PylT/RS expression cassette into the AAVS1 safe harbor locus for robust protein expression.
Main Methods:
- Utilized CRISPR-Cas9 gene editing to induce double-strand breaks (DSBs) for nonhomologous end joining (NHEJ) repair.
- Targeted the PylT/RS expression cassette to the AAVS1 safe harbor locus in human cells.
- Employed a modular amber suppression plasmid system for knock-in and subsequent transient transfection.
Main Results:
- Successfully generated CRISPR-Cas9 knock-in cell lines for stable expression of Mma PylT/RS.
- Demonstrated efficient amber suppression in engineered cell lines.
- Showcased the utility of the AAVS1 safe harbor locus for consistent PylT/RS expression.
Conclusions:
- The developed CRISPR-Cas9 knock-in strategy provides a robust method for creating stable cell lines for genetic code expansion.
- This approach facilitates the site-specific incorporation of ncAAs, enabling advanced protein engineering applications.
- The protocol offers a generalizable platform for generating genetically modified mammalian cells for diverse research purposes.
