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dMMR killer: A conditional suicide gene that preferentially kills DNA mismatch repair-deficient cells

Shinta Saito1, Shingo Kato2,3, Usaki Arai1

  • 1Department of Life and Environmental System Science, Graduate School of Nanobioscience, Yokohama City University, Yokohama 236-0027, Japan.

Molecular Therapy. Nucleic Acids
|February 25, 2026
PubMed

Insights

Researchers developed a novel gene therapy to kill cancer cells lacking DNA mismatch repair (MMR). This approach uses artificial DNA constructs to selectively target and eliminate MMR-deficient tumors, offering a new avenue for cancer treatment.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • DNA mismatch repair (MMR) is vital for genome integrity.
  • MMR deficiency is implicated in over 10% of human cancers.
  • Targeting MMR-deficient cells is a significant therapeutic goal.

Purpose of the Study:

  • To develop a strategy for stage-independent killing of MMR-deficient cancer cells.
  • To create a novel suicide gene therapy exploiting MMR defects.

Main Methods:

  • Transient transfection of artificial DNA constructs into cancer cells.
  • Design of constructs to form an active suicide gene dependent on MMR deficiency.
  • Evaluation of in vitro and in vivo anticancer activity in HCT116 xenograft models.

Main Results:

  • Artificial DNA constructs efficiently killed MMR-deficient cancer cells.
  • The suicide gene's activation relies on MMR-mediated inhibition of DNA recombination.
  • Demonstrated in vivo anticancer activity in a tumor xenograft model.

Conclusions:

  • A novel DNA recombination-dependent suicide gene effectively targets MMR-deficient tumors.
  • This approach offers a potential new therapeutic tool for MMR-deficient cancers.
  • The strategy may overcome resistance to immunotherapy in certain cancers.
Keywords:
DNA mismatch repairDT-AMLH1MSH2MT: Non-coding RNAsconditional gene expressiondMMR tumorimmunotherapysingle-strand annealingsuicide gene

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