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Core Circadian Clock Genes Regulate Leukemia Stem Cells in AML.

Rishi V Puram1, Monika S Kowalczyk2, Carl G de Boer2

  • 1Department of Medicine, Division of Hematology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Program in Biological and Biomedical Sciences, Harvard Medical School, Boston, MA 02115, USA; Broad Institute of Harvard University and MIT, Cambridge, MA 02142, USA.

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The core circadian clock genes, Clock and Bmal1, are essential for acute myeloid leukemia (AML) cell growth. Disrupting these genes halts leukemia progression and depletes leukemia stem cells (LSCs).

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Area of Science:

  • Hematology
  • Molecular Biology
  • Chronobiology

Background:

  • Leukemia stem cells (LSCs) drive acute myeloid leukemia (AML) and are crucial therapeutic targets.
  • Identifying essential genes for LSC survival and proliferation is key to developing curative AML therapies.

Purpose of the Study:

  • To identify essential transcription factors (TFs) for leukemia stem cell (LSC) function in acute myeloid leukemia (AML).
  • To investigate the role of the circadian clock in AML pathogenesis and LSC maintenance.

Main Methods:

  • Utilized pooled in vivo RNA interference (RNAi) screens in a murine AML model.
  • Analyzed the function of identified genes in AML cell proliferation, differentiation, and LSC depletion.
  • Employed genetic knockout models to assess leukemia-specific dependence on the circadian pathway.

Main Results:

  • Identified the circadian rhythm transcription factors, Clock and Bmal1, as essential for AML cell growth in vitro and in vivo.
  • Demonstrated that disruption of core circadian pathway components exerts anti-leukemic effects, including impaired proliferation, enhanced myeloid differentiation, and LSC depletion.
  • Confirmed that both normal and malignant hematopoietic cells possess functional circadian clocks, but AML exhibits a specific dependence on this pathway.

Conclusions:

  • Core circadian clock genes play a critical role in the biology and propagation of acute myeloid leukemia.
  • The circadian pathway represents a potential therapeutic vulnerability in AML, offering new avenues for treatment development.