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Related Experiment Video

Updated: Feb 12, 2026

Non-Viral Engineering of Primary Human T Cells via Homology-Mediated End-Joining Targeted Integration of Large DNA Templates
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A multi-landing pad DNA integration platform for mammalian cell engineering.

Leonid Gaidukov1, Liliana Wroblewska2, Brian Teague1

  • 1Synthetic Biology Center, Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

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Summary

Researchers developed a new method for stably integrating large DNA amounts into CHO cells. This platform enables precise, multi-copy gene insertion for enhanced protein production and synthetic biology applications.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Synthetic Biology

Background:

  • Engineering mammalian cell lines for stable transgene expression requires precise DNA insertion into specific genomic locations.
  • Current methods for large-scale DNA integration in cells like CHO (Chinese hamster ovary) cells are limited in efficiency and control.

Purpose of the Study:

  • To develop a reliable platform for large-scale, site-specific DNA integration in CHO cells.
  • To enable stable, long-term expression of multiple transgenes for applications in biomanufacturing and synthetic biology.

Main Methods:

  • Identification and validation of 21 novel genomic 'landing pad' sites in CHO cells for stable transgene expression.
  • Construction of CHO cell lines with one, two, or three recombination sites at selected loci.
  • Utilizing BxB1 recombinase and distinct selection markers for efficient, site-specific integration of large DNA payloads (up to 100 kb).

Main Results:

  • Demonstrated controllable integration of up to nine copies of a monoclonal antibody gene cassette (approx. 100 kb) into targeted genomic sites.
  • Achieved stable recombinant protein expression for weeks, with expression levels linearly correlating to the number of integrated gene copies.
  • Successfully targeted multiple sites simultaneously with a single transfection event.

Conclusions:

  • The developed multi-copy, site-specific integration platform offers controllable and reproducible insertion of large DNA quantities into stable genomic sites.
  • This technology has broad applications for mammalian synthetic biology, recombinant protein production, and biomanufacturing.
  • The platform facilitates the engineering of cell lines for enhanced and stable production of biologics.