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MLL fusion partners AF4 and AF9 interact at subnuclear foci

F Erfurth1, C S Hemenway, A C de Erkenez

  • 1Department of Pathology, The University of Chicago, Chicago, IL, USA. ferfurt@lumc.edu

Leukemia
|November 7, 2003
PubMed

Insights

Researchers discovered a protein interaction between AF4 and AF9, key MLL fusion partners in leukemia. This interaction forms distinct nuclear structures called AF4 bodies, suggesting a web of interactions disrupted in leukemogenesis.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • The Mixed Lineage Leukemia (MLL) gene is frequently altered in acute leukemias.
  • MLL gene translocations fuse MLL with over 30 different partner genes.
  • MLL fusion partners lack shared structural or functional characteristics.

Purpose of the Study:

  • To investigate potential protein interactions among MLL fusion partners.
  • To characterize the subnuclear localization of interacting MLL fusion partners.

Main Methods:

  • Protein interaction studies using co-immunoprecipitation.
  • Subcellular localization analysis via immunofluorescence microscopy.
  • Investigation of MLL-AF4 fusion protein effects on AF9 localization.

Main Results:

  • Identified a novel protein interaction between AF4 and AF9, common MLL fusion partners.
  • Observed this interaction localized to discrete nuclear structures termed 'AF4 bodies'.
  • Demonstrated that the MLL-AF4 fusion protein maintains the AF4-AF9 interaction and can alter AF9's subnuclear localization.

Conclusions:

  • MLL fusion partners may form a network of interactions crucial for cellular function.
  • Disruption of this interaction network by MLL fusion is a potential mechanism in leukemogenesis.
  • AF4 bodies represent novel nuclear structures involved in MLL-related leukemia pathogenesis.

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