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The tRNA Editing Complex ADAT2/3 Promotes Cancer Cell Growth and Codon-biased mRNA Translation.

Julia Ramirez-Moya1, Titi Rindi Antika2, Qi Liu3

  • 1Stem Cell Program, Boston Children's Hospital, Boston, MA 02115, USA; Division of Hematology/Oncology, Boston Children's Hospital, Boston, MA 02115, USA; Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.

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|September 4, 2025
PubMed
Summary
This summary is machine-generated.

Adenosine to Inosine (A-to-I) tRNA editing, crucial for gene expression, is vital for liposarcoma growth. Targeting the ADAT2/3 enzymes could offer a new cancer therapy approach.

Keywords:
ADAT2ADAT3EditingInosinetRNA

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Epigenetics

Background:

  • Transfer RNAs (tRNAs) undergo chemical modifications affecting stability and function.
  • Adenosine to Inosine (A-to-I) editing at tRNA position A34 expands codon recognition and is essential for mRNA translation.
  • The role of tRNA editing in cancer has not been previously investigated.

Purpose of the Study:

  • To investigate the role of tRNA editing in cancer, specifically focusing on the ADAT2/3 deaminase complex.
  • To determine if ADAT2/3 is implicated in liposarcoma (LPS) development and progression.
  • To elucidate the mechanistic link between ADAT2/3 activity, mRNA translation, and oncogenesis.

Main Methods:

  • Analysis of gene amplification and overexpression of ADAT2/3 in human tumors.
  • Depletion of ADAT2 in liposarcoma cells to assess effects on cell growth and tumorigenicity.
  • Measurement of tRNA editing activity, mRNA translation efficiency, and protein homeostasis.
  • Identification of mRNA targets influenced by ADAT2/3-mediated tRNA editing.

Main Results:

  • ADAT2/3 genes are frequently amplified or overexpressed in multiple tumor types, including liposarcoma.
  • Liposarcoma cell proliferation and tumorigenicity are dependent on ADAT2/3 tRNA editing activity.
  • ADAT2 depletion leads to reduced tRNA editing, impaired translation of specific mRNAs, and disrupted protein homeostasis.
  • ADAT2 promotes oncogenesis by facilitating the translation of growth-promoting mRNAs with NNC codons.

Conclusions:

  • ADAT2/3-mediated A-to-I tRNA editing plays a significant role in liposarcoma development and progression.
  • ADAT2 is essential for decoding specific codons and translating oncogenic mRNAs, thereby promoting tumor growth.
  • ADAT2/3 represents a promising novel therapeutic target for cancer treatment.