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Related Concept Videos

Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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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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Multipotency of Hematopoietic Stem Cells01:19

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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Commitment is the  process whereby stem cells:
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Maintenance of the ES Cell State01:14

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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Hematopoiesis01:21

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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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Combinatorial Gene Control02:33

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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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Updated: Dec 11, 2025

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The Polycomb-associated factor PHF19 controls hematopoietic stem cell state and differentiation.

Pedro Vizán1, Arantxa Gutiérrez1, Isabel Espejo1

  • 1Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), Dr. Aiguader 88, Barcelona 08003, Spain.

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Depleting PHF19 enhances hematopoietic stem cell (HSC) identity and quiescence, contrary to other Polycomb repressive complex 2 (PRC2) subunits. This epigenetic regulation is key for proper blood cell production and differentiation.

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Area of Science:

  • Hematology
  • Epigenetics
  • Stem Cell Biology

Background:

  • Adult hematopoietic stem cells (HSCs) generate all blood cell types but are heterogeneous and plastic.
  • Epigenetic mechanisms, including Polycomb repressive complex 2 (PRC2), influence HSC function.
  • PHF19 is a PRC2 subunit preferentially expressed in hematopoietic precursors.

Purpose of the Study:

  • To investigate the role of PHF19 in regulating HSC identity, quiescence, and differentiation.
  • To elucidate the molecular mechanisms by which PHF19 affects hematopoiesis.

Main Methods:

  • Genetic depletion of PHF19 in mouse hematopoietic precursors.
  • Analysis of HSC identity, quiescence, and proliferation.
  • Assessment of blood cell production and differentiation.
  • Molecular analysis of H3K27me3 distribution.

Main Results:

  • Genetic depletion of PHF19 increased HSC identity and quiescence.
  • PHF19 deletion led to defects in differentiation and aberrant hematopoiesis.
  • PHF19 loss caused redistribution of H3K27me3 to blood lineage-specific genes.

Conclusions:

  • PHF19 plays a critical role in controlling HSC differentiation and maintaining proper hematopoiesis.
  • Epigenetic regulation by PHF19 is essential for HSC identity and function.
  • PHF19 acts as a key regulator of the epigenetic landscape in hematopoietic stem cells.