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A Singular Base Editing Platform for Polyfunctional Multiplex Engineering of Immune Cells.

Joseph G Skeate1,2,3, Nicholas J Slipek1,2,3, Walker S Lahr1,2,3

  • 1Department of Pediatrics, University of Minnesota, Minneapolis, MN, USA.

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Summary
This summary is machine-generated.

This study introduces a new base editing method for engineering safer chimeric antigen receptor (CAR) T cells. The INSERT platform enables efficient, single-step CAR T cell creation with enhanced anti-cancer function and minimal off-target effects.

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Area of Science:

  • Biotechnology
  • Immunotherapy
  • Gene Editing

Background:

  • Current CAR T cell engineering methods face safety concerns due to random integration or double-strand breaks.
  • Developing safer and more efficient methods for CAR T cell generation is crucial for therapeutic applications.

Purpose of the Study:

  • To develop an all-in-one tool for multiplex gene knockout and knock-in for advanced CAR T cell engineering.
  • To utilize base editor nickase activity to stimulate homology-directed repair for precise CAR T cell modification.

Main Methods:

  • Leveraged cytosine and adenine base editor (ABE) nickase activity to promote homology-directed repair (HDR).
  • Employed a novel sgRNA design and rAAV-delivered DNA template for efficient ABE8e-stimulated HDR in human T cells.
  • Achieved multiplex gene knockout (>95% quadplex KO of B2M/CD3ε/PDCD1/CISH) alongside CAR T cell knock-in.

Main Results:

  • Demonstrated efficient single-step generation of highly functional off-the-shelf CAR T cells targeting CD19, CD33, or mesothelin.
  • Observed no detectable translocations or significant off-target edits, indicating a high safety profile.
  • Showcased efficacy against multiple cancer cell lines and a 3D spheroid model.

Conclusions:

  • The Iterative Nicking for Synchronous Engineered Reprogramming of T cells (INSERT) platform offers a safe and simplified approach for CAR T cell engineering.
  • This method enables the creation of advanced CAR T cell products with enhanced function and improved safety.
  • INSERT establishes a promising platform for the development of next-generation cancer immunotherapies.