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FANCD2 activates transcription of TAp63 and suppresses tumorigenesis

Eunmi Park1, Hyungjin Kim, Jung Min Kim

  • 1Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, 450 Brookline Avenue, Boston, MA 02215, USA.

Molecular Cell
|June 29, 2013
PubMed

Insights

Fanconi anemia (FA) patients have increased squamous cell cancer risk due to reduced FANCD2-Ub and TAp63. Usp1 inhibition may offer a strategy to boost TAp63 and prevent these cancers.

Area of Science:

  • Genetics
  • Cancer Biology
  • DNA Repair

Background:

  • Fanconi anemia (FA) is a rare genetic disorder linked to squamous cell cancer susceptibility.
  • FA proteins, including FANCD2, are crucial for DNA repair, with monoubiquitination of FANCD2 being a key step.
  • The mechanism by which FANCD2 monoubiquitination (FANCD2-Ub) prevents squamous cell cancers remains unclear.

Purpose of the Study:

  • To investigate the role of FANCD2 monoubiquitination in skin carcinogenesis.
  • To explore the relationship between Usp1, FANCD2-Ub, and the tumor suppressor TAp63.
  • To evaluate Usp1 inhibition as a potential therapeutic strategy for squamous cell cancers.

Main Methods:

  • Utilizing Fancd2-deficient and Usp1-deficient mouse models.
  • Analyzing Ras-oncogene-driven skin carcinogenesis.
  • Assessing TAp63 activation and cellular senescence.

Main Results:

  • Fancd2-deficient mice exhibited increased susceptibility to skin tumors.
  • Usp1-deficient mice, with high FANCD2-Ub levels, showed resistance to skin tumors.
  • FANCD2-Ub was found to activate TAp63 transcription, inducing cellular senescence and inhibiting tumor formation.

Conclusions:

  • Reduced FANCD2-Ub and TAp63 protein levels likely contribute to squamous cell cancer susceptibility in FA patients.
  • Usp1 inhibition emerges as a promising strategy for upregulating TAp63.
  • Targeting Usp1 could be a novel approach for preventing or treating squamous cell cancers in the general population.

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