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CEBPA repression by MECOM blocks differentiation to drive aggressive leukemias.

Travis J Fleming1,2,3,4, Mateusz Antoszewski1,2,3,4,5, Sander Lambo1,2,4,5

  • 1Division of Hematology/Oncology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.

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High MECOM expression drives aggressive Acute Myeloid Leukemia (AML) by blocking cell differentiation. Targeting a specific regulatory element reversed this, promoting AML cell differentiation and reducing disease burden.

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Area of Science:

  • Hematology
  • Molecular Biology
  • Cancer Research

Background:

  • Acute myeloid leukemias (AMLs) often have poor prognoses, particularly high-risk cases.
  • Mechanisms by which AMLs co-opt stem cell gene regulatory programs are poorly understood.
  • Increased MECOM expression is a key driver in incurable AMLs, but its role in aggressive phenotypes is unknown.

Purpose of the Study:

  • To elucidate the mechanisms by which MECOM drives aggressive AML phenotypes.
  • To identify therapeutic strategies targeting MECOM-driven leukemogenesis.

Main Methods:

  • Engineered and applied targeted protein degradation combined with functional genomic readouts.
  • Investigated MECOM's direct impact on gene regulatory programs.
  • Analyzed a specific MECOM-bound cis-regulatory element downstream of CEBPA.

Main Results:

  • MECOM promotes malignant stem cell-like states by repressing pro-differentiation gene regulatory programs.
  • A single MECOM-bound cis-regulatory element is necessary and sufficient for maintaining MECOM-driven leukemias.
  • Targeted activation of this element induced AML cell differentiation and reduced leukemia burden in vivo.

Conclusions:

  • MECOM's repression of differentiation programs is a key mechanism in aggressive AML.
  • A specific cis-regulatory element is a critical vulnerability in MECOM-driven AML.
  • Targeting this element offers a potential differentiation-based therapy for AML.