Yolk Sac Hematopoiesis
Yolk Sac Hematopoiesis - Related Videos
10:38
Isolation of Early Hematopoietic Stem Cells from Murine Yolk Sac and AGM
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Cited by 19 •
2008
This video shows how to micro-dissect the yolk sac and aorta-gonad-mesonephros region from embryos and use flow cytometry to sort hematopoietic stem cells.
11:53
Primary Endodermal Epithelial Cell Culture from the Yolk Sac Membrane of Japanese Quail Embryos
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Cited by 6 •
2016
To study the mechanism of lipid utilization in yolk sac membranes during the late stages of avian embryonic development, we established a primary Japanese quail embryonic endodermal epithelial cell culture system.
01:21
Hematopoiesis
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2025
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...
03:58
Embryo Microinjection: A Technique to Deliver a Compound into the Zebrafish Yolk
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2023
This video describes a technique of Embryo microinjection to deliver compounds into Zebrafish yolk sac.
01:20
Overview of Hematopoiesis
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2024
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...
FAQs
Mesoderm-derived hemogenic endothelial populations serve as an early cellular source for blood formation. Within the yolk sac, these cells organize into blood islands and undergo endothelial-to-hematopoietic transition, a process in which endothelial cells generate blood-lineage cells. This relationship helps explain how vascular and hematopoietic lineages arise together during early embryonic development.
Blood islands provide an organized developmental setting in which endothelial and blood-forming activities occur together. Their formation marks the coordination of hemogenic endothelial populations with the emergence of primitive erythroblasts and other transient blood progenitors. Studying these structures therefore helps researchers connect early blood production with the establishment of embryonic circulation.
Yolk sac hematopoiesis supplies blood cells before the embryo develops bone marrow as a blood-forming site. Its products include primitive erythroblasts and transient blood progenitors that support early development rather than representing the later marrow stage. This temporal distinction allows developmental biologists to examine how embryonic blood production precedes subsequent hematopoietic organization.
A useful analysis separates mesoderm-derived hemogenic endothelial organization, blood-island formation, endothelial-to-hematopoietic transition, and the appearance of primitive erythroblasts or other transient progenitors. Treating these as related but distinct events clarifies the progression from vascular-associated cells to blood production and helps connect cellular changes with the onset of embryonic circulation.
Experimental models can be used to investigate how blood and vascular lineages arise and how hematopoietic stem and progenitor cells develop. They also provide a developmental context for examining congenital blood disorders. By focusing on early yolk sac events, researchers can study blood formation before bone marrow becomes the principal developmental reference point.
The process offers a developmental framework for studying the emergence of hematopoietic stem and progenitor cells, which is relevant to efforts involving stem-cell production. Its association with vascular and blood lineage formation also informs tissue-engineering research. These applications arise because the yolk sac provides an early model of coordinated blood and vascular development.