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Related Concept Videos

Hematopoiesis01:21

Hematopoiesis

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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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Overview of Hematopoiesis01:20

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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).
Developmental Phases of Hematopoiesis
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Regulation of Hematopoietic Stem Cells01:01

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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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Lineage Commitment01:21

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Commitment is the  process whereby stem cells:
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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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Forced Transdifferentiation01:28

Forced Transdifferentiation

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Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
Artificial...
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Charting epimutation dynamics in human hematopoietic differentiation.

Xiaohuan Qin1, Jiayi Lu1, Peng Wu1

  • 1State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Haihe Laboratory of Cell Ecosystem, Department of Stem Cell and Regenerative Medicine, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China.

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Epimutations, variations in DNA methylation, significantly impact blood cell development and diseases. Our study maps these epigenetic changes, revealing their crucial role in human hematopoiesis and offering new insights.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Hematology

Background:

  • DNA methylation is crucial for hematopoietic differentiation.
  • Epimutations introduce epigenetic heterogeneity, but their role in hematopoiesis and disease is unclear.

Purpose of the Study:

  • To develop a tool for quantifying epimutations.
  • To investigate the epimutation landscape during human hematopoietic differentiation.
  • To explore the role of epimutations in hematopoietic stem cells and acute myeloid leukemia.

Main Methods:

  • Developed the Julia package EpiMut for rapid and accurate epimutation quantification.
  • Analyzed epimutation landscapes across 13 blood cell types from stem cells to mature cells.
  • Investigated epimutations in hematopoietic stem cells and acute myeloid leukemia.

Main Results:

  • Identified substantial epigenetic variations across genomic regions during differentiation.
  • Observed stepwise epimutation dynamics during lineage differentiation.
  • Found epimutations enriched signals related to lineage differentiation.
  • Linked epimutations in hematopoietic stem cells and acute myeloid leukemia to cell function and disease.

Conclusions:

  • EpiMut provides a comprehensive epimutation map of human hematopoiesis.
  • Epimutations play significant roles in normal hematopoietic regulation and malignant disorders.
  • This study offers novel insights into the epigenetic mechanisms governing blood cell development.