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Related Experiment Video

Updated: Apr 13, 2026

Real-time Imaging of Myeloid Cells Dynamics in ApcMin/+ Intestinal Tumors by Spinning Disk Confocal Microscopy
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Defective Myb Function Ablates Cyclin E1 Expression and Perturbs Intestinal Carcinogenesis.

Dane Cheasley1, Lloyd Pereira2, Shienny Sampurno2

  • 1Sir Peter MacCallum Oncology Department, Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia. University of Melbourne, Melbourne, Victoria, Australia. Latrobe Institute of Molecular Science, Department of Genetics, Latrobe University, Bundoora, Victoria, Australia. Walter and Eliza Hall Institute, Parkville, Victoria, Australia.

Molecular Cancer Research : MCR
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PubMed
Summary
This summary is machine-generated.

Myb protein directly regulates Cyclin E1 expression in intestinal cells. This regulation is crucial for cell cycle reentry and is implicated in colorectal cancer development and tumor growth.

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Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • Cyclin E1 (Ccne1) is vital for cell cycle reentry.
  • Reduced Ccne1 expression was observed in hypomorphic mutant Myb mice (Myb(Plt4)).
  • Ccne1 induction after radiation damage was impaired in Myb-mutant mice.

Purpose of the Study:

  • To investigate if Myb directly regulates Ccne1 expression.
  • To determine if elevated Myb contributes to Cyclin E1-driven tumor growth in colorectal cancer.

Main Methods:

  • Analysis of Myb and Ccne1 expression in mouse and human adenomas.
  • Chromatin immunoprecipitation (ChIP) to assess Myb binding to the Ccne1 promoter.
  • Myb(Plt4) mutant mouse models and Ccne1 transcript knockdown in cancer cells.

Main Results:

  • Myb and Ccne1 expression levels were coupled in both mouse and human adenomas.
  • Myb directly binds to the Ccne1 promoter, regulating its endogenous expression.
  • Myb(Plt4) acted as a dominant-negative factor, inhibiting wild-type Myb.
  • Knockdown of CCNE1 in colorectal cancer cells reduced tumor formation and stabilized chromosome ploidy.

Conclusions:

  • Myb is a direct regulator of Cyclin E1 expression in normal and transformed intestinal epithelial cells.
  • Myb-dependent Cyclin E1 expression is essential for intestinal tumorigenesis.
  • Cyclin E1 plays a role in cell-cycle progression and chromosome instability in cancer.