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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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Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
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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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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
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Database-guided Flow-cytometry for Evaluation of Bone Marrow Myeloid Cell Maturation
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患有唐氏综合征的儿童的血液变化

Golda Grinberg1, Gwen Sokoloff2, Beverly Hay2

  • 1Children's Medical Center, University of Texas Southwestern Medical Center, Dallas, TX.

Journal of pediatric hematology/oncology
|September 4, 2025
PubMed
概括

患有唐氏综合征 (DS) 的儿童表现出明显的全血细胞计 (CBC) 范围,包括较高的平均体积和较低的淋巴细胞计数. 这些发现表明DS群体的良性血液学变异.

关键词:
血细胞计数唐氏综合征血红蛋白淋巴细胞平均体积

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科学领域:

  • 儿童血液学
  • 遗传学与遗传疾病
  • 临床病理学

背景情况:

  • 唐氏综合征 (DS) 儿童的血液异常已被记录,但缺乏一致的结论.
  • 确定完整血清 (CBC) 的可靠参考范围对于精确的临床评估至关重要.
  • 之前的研究提供了有关儿科DS群体的特定CBC参数的相互矛盾的数据.

研究的目的:

  • 评估和定义全血细胞计 (CBC) 范围,特别针对诊断为唐氏综合征 (DS) 的儿童.
  • 通过呈现儿童DS患者的平均CBC值分层来提供临床资源.
  • 鉴定和描述DS儿童常见的血液变异.

主要方法:

  • 单个机构队列的回顾性分析.
  • 对患有唐氏综合征 (DS) 的儿科患者的完整血清 (CBC) 数据的评估.
  • 观察到的CBC参数与已确定的参考值进行比较.

主要成果:

  • 与基准值相比,患有唐氏综合征 (DS) 的儿童的体积平均值 (MCV) 较高.
  • 在儿童DS队列中始终观察到较低的绝对淋巴细胞数量.
  • 在DS患者中发现血红蛋白 (Hgb) 值上升的趋势.

结论:

  • 在患有唐氏综合征 (DS) 的儿童中发现的血液学发现 (MCV升高,淋巴细胞减少,Hgb趋势升高) 似乎是一致的变化.
  • 这些变异被认为是良性的,代表了DS群体的特征性血液学特征.
  • 这项研究提供了必要的数据,以准确解释儿科DS评估中的CBC结果.