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MDM4 at the Crossroads: Beyond p53 and MDM2

Dipesh Thapa1,2, Allison St John1,2, Alejandro Parrales1

  • 1Section of Hematology, Oncology, and Bone Marrow Transplant, Department of Pediatrics, Children's Mercy Research Institute, Kansas City, MO 64108, USA.

Cancers
|April 14, 2026
PubMed

Insights

Murine Double Minute 4 (MDM4) regulates tumor suppressor p53 but also has critical p53-independent roles. Understanding MDM4

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Biology

Background:

  • MDM4 (Murine Double Minute 4) is a key negative regulator of the tumor suppressor p53.
  • MDM4 collaborates with MDM2 to degrade p53, promoting tumor development.
  • Emerging evidence highlights MDM4's significant p53-independent functions.

Purpose of the Study:

  • To elucidate the diverse p53-independent roles of MDM4.
  • To explore MDM4's interactions with various proteins beyond the p53-MDM2 axis.
  • To understand MDM4's implications in cancer biology and therapeutic development.

Main Methods:

  • Literature review and analysis of existing studies on MDM4.
  • Identification of MDM4 interacting partners and their functional consequences.
  • Comparative analysis of MDM4's roles in both p53-dependent and p53-independent pathways.

Main Results:

  • MDM4 regulates cell cycle, pre-leukemic progression, and ferroptosis via p53-independent interactions (e.g., with p73, E2F1, TRIM21).
  • MDM4 also controls proliferation, survival, DNA repair, and replication fork progression independently of p53 and MDM2 through interactions with SMADs, pRB, Nbs1, and mTORC1.
  • MDM4 exhibits context-dependent oncogenic or tumor-suppressive activities independent of p53.

Conclusions:

  • MDM4's biological functions extend significantly beyond its canonical role in inhibiting p53.
  • MDM4's complex interactions and dual roles in cancer necessitate further investigation.
  • Targeting MDM4 may offer novel therapeutic strategies for various cancers.
Keywords:
MDM2MDM4ferroptosisindependentp53replication fork progressiontumorigenesis

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