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Universal toxin-based selection for precise genome engineering in human cells.

Songyuan Li1, Nina Akrap2, Silvia Cerboni3

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Researchers developed a new method using Diphtheria Toxin (DT) selection to efficiently enrich precisely engineered cells. This strategy enhances genome editing in various cell types, advancing gene and cell therapies.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • CRISPR-Cas and base editing systems are powerful genome engineering tools.
  • Low efficiency of genome editing in primary cells hinders therapeutic applications.
  • A robust method for enriching precisely edited cells is needed.

Purpose of the Study:

  • To develop and validate a novel selection strategy for efficient enrichment of genetically engineered cells.
  • To demonstrate the applicability of the method across various cell types and in vivo.

Main Methods:

  • Screening for mutations in the Diphtheria Toxin (DT) receptor to confer toxin resistance.
  • Using DT selection to enrich cells with precisely targeted gene modifications at an independent locus.
  • Applying CRISPR-Cas and base editing systems for gene modification.

Main Results:

  • The DT-based selection method rapidly generates homogenous cell populations with bi-allelic DNA cassette integration.
  • The strategy successfully enriches precisely engineered cells in cancer-transformed and non-transformed cells, including stem cells and T-lymphocytes.
  • The method is effective in vivo in mice with humanized livers.

Conclusions:

  • This work presents a flexible, precise, and efficient selection strategy for CRISPR-Cas and base editing.
  • The toxin-based enrichment method overcomes limitations in genome editing efficiency for therapeutic development.