相关实验视频
Updated: Jun 30, 2025

06:41
Isolation Method for Long-Term and Short-Term Hematopoietic Stem Cells
Published on: May 19, 2023
1.8K
发育性造血干细胞变异解释了生命后期的克隆性造血
Jesse Kreger1, Jazlyn A Mooney1, Darryl Shibata2
1Department of Quantitative and Computational Biology, University of Southern California, Los Angeles, CA, USA.
bioRxiv : the preprint server for biology
|March 18, 2024
概括
在衰老中常见的克隆性造血,可能源于生命早期的干细胞变异. 对这些出生前的差异起作用的弱选择解释了后来的克隆在血液中的统治地位.
科学领域:
- 血液学 血液学 血液学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
背景情况:
- 克隆性血液形成随着年龄的增长而增加,但其起源尚不清楚,特别是当驱动突变缺席时.
- 现有数据表明,选择较弱,变种的早期获取具有无法解释的初始增长.
- 了解克隆性血液形成的早期驱动因素对于衰老和癌症研究至关重要.
研究的目的:
- 通过使用波动的CpG甲基化作为血统标记物来调查克隆性血液形成的起源.
- 为了确定在出生前存在的干细胞变异是否会在以后的生活中导致克隆性血液形成.
- 阐明弱选择在与年龄相关的克隆性血液形成的发展中的作用.
主要方法:
- 利用波动的CpG甲基化模式作为追踪干细胞克隆动态的血统标记.
- 分析了单胞胎双胞胎的共享产前循环,以追踪早期干细胞变异.
- 在大种群中应用了弱选择动态的理论模型.
主要成果:
- 证明,出生前干细胞变异的弱选择可以导致克隆性造血.
- 观察到不相关个体之间的CpG甲基化相关性较低,但在老年单胞胎双胞胎中相关性较高.
- 提供了证据,早期发育事件,而不是后来的突变,驱动主导干细胞克隆.
结论:
- 血中波动的CpG甲基化模式在无血缘关系的个体中呈现较低的相关性,但在老年单胞胎双胞胎中呈现较高的相关性,支持出生前的起源.
- 晚年生命中的克隆性血液形成似乎是由对出生前建立的变异起作用的弱选择驱动的.
- 这项研究重新定义了对克隆性血液形成的理解,突出了其发育根源.
相关概念视频
Overview of Hematopoiesis
4.0K
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
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
4.0K
Regulation of Hematopoietic Stem Cells
3.2K
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...
3.2K
Multipotency of Hematopoietic Stem Cells
3.1K
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...
3.1K
Hematopoiesis
5.3K
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...
5.3K
Production of Formed Elements
1.4K
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.
Most HSCs commit to...
Most HSCs commit to...
1.4K
Lineage Commitment
3.0K
Commitment is the process whereby stem cells:
3.0K

