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A novel "chassis" PSC line for precise safe harbor site integration via selection-aided RMCE
Merve Ay1, Desi Veleva1, Mohammad M Chowdhury1
1StemCore, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, Australia.
Stem Cell Research
|June 28, 2025
Summary
We developed a human pluripotent stem cell line for precise DNA insertion into the AAVS1 safe harbor locus using recombination-mediated cassette exchange. This engineered cell line facilitates targeted gene insertion for research applications.
Area of Science:
- Stem Cell Biology
- Molecular Biology
- Genetic Engineering
Background:
- Human pluripotent stem cells (hPSCs) are crucial for regenerative medicine and disease modeling.
- Precise and efficient genetic modification of hPSCs is essential for their therapeutic applications.
- Identifying and utilizing safe harbor loci for transgene integration minimizes risks of insertional mutagenesis.
Purpose of the Study:
- To create a human pluripotent stem cell line engineered for targeted DNA insertion.
- To establish a reliable "chassis" cell line for recombination-mediated cassette exchange (RMCE).
- To develop a system for directional insertion of DNA fragments into the AAVS1 safe harbor locus.
Main Methods:
- Generation of a hPSC line targeting the AAVS1 safe harbor locus.
- Introduction of an excisable negative selection cassette flanked by FRT and FRT3 sites.
- Utilizing Flp recombinase for directional insertion via RMCE.
Main Results:
- The developed hPSC line exhibited standard colony morphology.
- Pluripotency markers were confirmed in the engineered hPSC line.
- The hPSC line maintained a normal karyotype post-engineering.
Conclusions:
- The engineered hPSC line serves as a functional acceptor for RMCE.
- This cell line provides a valuable AAVS1 safe harbor "landing site" for FRT/FRT3-flanked transgenes.
- The system enables precise and efficient genetic modification of hPSCs for future research and therapeutic development.
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