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Red blood cells  (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia,...
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Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
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Factors Affecting Erythropoiesis01:24

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The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
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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).
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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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Role of Hematopoietic Growth Factors01:28

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Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
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[Emerging perspectives on sideroblastic anemia].

Tohru Fujiwara1

  • 1Department of Laboratory Medicine and Infectious Diseases, Iwate Medical University School of Medicine.

[Rinsho Ketsueki] the Japanese Journal of Clinical Hematology
|August 6, 2025
PubMed
Summary
This summary is machine-generated.

Sideroblastic anemias (SAs) are anemias with ring sideroblasts. This review focuses on congenital X-linked sideroblastic anemia (XLSA) and acquired myelodysplastic syndrome with ring sideroblasts (MDS-RS) pathophysiology.

Keywords:
Gene mutationRing sideroblastSideroblastic anemiairon

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Area of Science:

  • Hematology
  • Genetics
  • Mitochondrial Biology

Background:

  • Sideroblastic anemias (SAs) are a group of disorders characterized by anemia and ring sideroblasts in the bone marrow.
  • These anemias can be congenital, stemming from genetic defects, or acquired.
  • Congenital sideroblastic anemia (CSA) involves mitochondrial dysfunction in heme and iron metabolism.

Purpose of the Study:

  • To review the current understanding of sideroblastic anemia pathophysiology.
  • To explore emerging perspectives on the mechanisms underlying SAs.
  • To specifically focus on the pathophysiology of X-linked sideroblastic anemia (XLSA) and myelodysplastic syndrome with ring sideroblasts (MDS-RS).

Main Methods:

  • Literature review of current research on sideroblastic anemias.
  • Analysis of genetic mutations in congenital forms.
  • Examination of pathological features in acquired forms.

Main Results:

  • X-linked sideroblastic anemia (XLSA), the most common CSA, results from mutations in the ALAS2 gene.
  • Myelodysplastic syndrome with ring sideroblasts (MDS-RS) is the most frequent acquired SA.
  • Both forms involve disruptions in heme biosynthesis and iron metabolism.

Conclusions:

  • Understanding the distinct pathophysiological pathways of XLSA and MDS-RS is crucial for diagnosis and treatment.
  • Further research into mitochondrial iron metabolism and heme synthesis is warranted.
  • This review provides a comprehensive overview of SA pathophysiology, highlighting key differences and similarities between congenital and acquired forms.