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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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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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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
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An evolutionary approach to clonally complex hematologic disorders.

Emily Schwenger1,2,3,4, Ulrich Steidl5,6,7,8

  • 1Albert Einstein College of Medicine - Montefiore Health System, Bronx, New York.

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Summary
This summary is machine-generated.

New models are needed to understand blood disorders. We propose viewing hematologic diseases as dynamic interactions between genetic and non-genetic cell populations and their microenvironment.

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Area of Science:

  • Hematology
  • Evolutionary Biology
  • Cancer Biology

Background:

  • Clonal complexity challenges traditional views of hematopoietic disorders.
  • Previous models of clonal hematopoiesis are insufficient to explain observed phenomena.
  • A new paradigm is required to understand the pathogenesis of blood disorders.

Purpose of the Study:

  • To reframe the understanding of hematologic disorder pathogenesis.
  • To incorporate emerging concepts of clonal complexity.
  • To integrate perspectives from evolutionary biology and hematologic malignancy research.

Main Methods:

  • Review of existing evidence in hematologic malignancies.
  • Application of evolutionary biology principles.
  • Synthesis of genetic and non-genetic subclone interactions with the microenvironment.

Main Results:

  • Hematologic disorders are better understood as dynamic processes.
  • Clonal complexity involves interplay between genetic and non-genetic subclones.
  • The tissue microenvironment plays a crucial role in disease pathogenesis.

Conclusions:

  • Traditional models of clonal dominance are inadequate.
  • A dynamic, multi-clonal, and microenvironment-aware perspective is essential for understanding blood disorders.
  • This reframed understanding can inform future treatment strategies for hematopoietic disorders.