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Updated: Jun 16, 2026

Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells
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Over-expression of Runx1 transcription factor impairs the development of thymocytes from the double-negative to

Won F Wong1, Megumi Nakazato, Toshio Watanabe

  • 1Institute of Development, Aging and Cancer, Graduate School of Life Sciences, Tohoku University, Sendai, Japan.

Immunology
|January 28, 2010
PubMed

Insights

Down-regulating Runx1 (Runt-related transcription factor 1) is crucial for T-cell development. Insufficient Runx1 down-regulation impairs thymocyte differentiation from double-negative to double-positive stages.

Area of Science:

  • Immunology
  • Developmental Biology
  • Molecular Biology

Background:

  • Runx1 transcription factor is essential for hematopoiesis and T-cell development.
  • Runx1 expression is high in double-negative (DN) thymocytes and decreases at the double-positive (DP) stage.

Purpose of the Study:

  • To investigate the necessity of Runx1 down-regulation for thymocyte differentiation from DN to DP stages.
  • To determine the role of different Runx1 promoters in thymocyte development.

Main Methods:

  • Over-expression of Runx1 in thymocytes using Lck-driven Cre.
  • Analysis of thymocyte populations (DN3, DN4, DP) and cell surface markers (CD27).
  • Assessment of cell proliferation using bromodeoxyuridine incorporation.

Main Results:

  • Artificial Runx1 over-expression did not affect DN3 cells but perturbed DN4 cells, reducing the CD27(hi) sub-fraction.
  • DN4 cell growth rate was halved, impairing their transition to the DP stage.
  • Over-expression from the distal Runx1 promoter, but not the proximal, inhibited thymocyte differentiation.

Conclusions:

  • Adequate down-regulation of distal Runx1 protein is essential for thymocyte transition from DN to DP stages.
  • This transition is a critical step for the expansion of the T-cell lineage.
  • Distal Runx1 protein may have a unique function in regulating thymocyte differentiation.

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