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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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PHF6 Expression Levels Impact Human Hematopoietic Stem Cell Differentiation.

Siebe Loontiens1,2, Anne-Catherine Dolens3, Steven Strubbe3

  • 1Cancer Research Institute Ghent (CRIG), Ghent, Belgium.

Frontiers in Cell and Developmental Biology
|November 30, 2020
PubMed
Summary

PHF6 protein is crucial for normal human blood cell development. Its loss accelerates T cell development by impacting NOTCH1 signaling, offering insights into T cell acute lymphoblastic leukemia (T-ALL).

Keywords:
NOTCHPHF6T cell developmenthematopoiesiszebrafish

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Area of Science:

  • Hematopoiesis
  • Epigenetics
  • Molecular Biology

Background:

  • Hematopoiesis involves complex regulatory networks; perturbations can lead to malignancies.
  • Loss-of-function mutations in PHF6 are linked to T cell acute lymphoblastic leukemia (T-ALL).
  • The function of PHF6 in normal hematopoiesis is not fully understood.

Purpose of the Study:

  • To investigate the role of PHF6 in human blood cell development.
  • To evaluate the impact of PHF6 on hematopoietic progenitor cell differentiation.
  • To elucidate the functional interaction between PHF6 and NOTCH1 signaling in T cell development.

Main Methods:

  • Knockdown studies in human cord blood and thymus-derived hematopoietic precursors.
  • In vitro differentiation models.
  • In vivo studies using a PHF6-deficient zebrafish model.

Main Results:

  • PHF6 levels differentially affect human hematopoietic progenitor cell differentiation, notably impacting lymphoid and erythroid lineages.
  • Loss of PHF6 accelerates human T cell development by downregulating NOTCH1 and its downstream targets.
  • PHF6 deficiency in zebrafish models also shows accelerated development upon reduced PHF6 or NOTCH1 activation.

Conclusions:

  • PHF6 expression is critical for normal human hematopoiesis.
  • PHF6 regulates T cell development through NOTCH1 signaling.
  • Findings provide insights into PHF6's role in T-ALL pathogenesis.