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NOTCH1 nuclear interactome reveals key regulators of its transcriptional activity and oncogenic function

Ahmad Yatim1, Clarisse Benne, Bijan Sobhian

  • 1INSERM U955, Créteil, France. ahmad.yatim@inserm.fr

Molecular Cell
|October 2, 2012
PubMed

Insights

Activating NOTCH1 mutations drive T cell leukemia. New research reveals NOTCH1 partners in the nucleus, uncovering epigenetic mechanisms crucial for Notch transcriptional activity in T-ALL.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Epigenetics

Background:

  • Activating mutations in NOTCH1 are common in T cell acute lymphoblastic leukemia (T-ALL).
  • The precise regulation of NOTCH1 function within the nucleus is not fully understood.
  • NOTCH1 is a key regulator of T cell development.

Purpose of the Study:

  • To identify nuclear partners of NOTCH1 in T-ALL cells.
  • To elucidate the molecular mechanisms governing NOTCH1 transcriptional activity.
  • To investigate the role of epigenetic modifiers in NOTCH1 function.

Main Methods:

  • Immunoaffinity purification to identify NOTCH1 nuclear complexes.
  • Analysis of protein-protein interactions in T-ALL cells.
  • Assays to determine the demethylase activity of identified proteins.

Main Results:

  • NOTCH1 forms a complex with AF4p12, PBAF, LSD1, and PHF8 in T-ALL cells.
  • LSD1 and PHF8 demethylase activity promotes epigenetic modifications at Notch-target genes.
  • LSD1 acts as a corepressor with CSL but as a coactivator with NOTCH1 upon activation.

Conclusions:

  • NOTCH1 transcriptional activity is regulated by a novel multifunctional complex involving epigenetic modifiers.
  • These findings provide new insights into NOTCH1 regulation in T-ALL.
  • Understanding the NOTCH1 interaction landscape is critical for deciphering its functions and developing therapies.

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