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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Multiple pathways of CD34+ cell differentiation during embryogenesis.

Ting Wang1, Hui Gong1,2, Guoguo Ye1

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CD34+ cells generate distinct endothelial, hematopoietic, and fibroblast progenitor waves during embryonic development. This study maps their dynamic trajectory, revealing new insights for regenerative medicine.

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Genomics

Background:

  • CD34 is a known marker for endothelial and hematopoietic stem cells, but its precise role in development is debated.
  • Understanding the lineage potential of CD34+ cells is crucial for vascular development and hematopoiesis.

Purpose of the Study:

  • To elucidate the dynamic developmental trajectory and lineage potential of CD34+ cells during embryogenesis.
  • To redefine the temporal shifts and cell states of CD34+ cells.
  • To identify molecular signatures for distinct progenitor types in human cord blood.

Main Methods:

  • Inducible genetic lineage tracing
  • Proteomics
  • Single-cell RNA sequencing (scRNA-seq) in human and mouse embryos
  • Analysis of human umbilical cord blood

Main Results:

  • Identified distinct, spatiotemporally restricted progenitor waves derived from CD34+ cells with endothelial, hematopoietic, and fibroblastic fates.
  • Demonstrated a Kdr-dependent mechanism for early vasculogenesis by CD34+ progenitors.
  • Revealed cell cycle activation as a switch for endothelial-to-hematopoietic transition (EHT) from E9.5 to E14.5.
  • Discovered a novel wave of CD34+ progenitors generating fibroblasts in late embryogenesis.
  • Identified GFPT2 as a specific marker for fibroblast progenitors in human cord blood.

Conclusions:

  • CD34+ cells exhibit dynamic lineage potential throughout embryogenesis, generating distinct progenitor waves.
  • This study provides a high-resolution atlas of CD34+ cell development, redefining their roles.
  • Findings offer a framework for precise manipulation of CD34+ cells in regenerative medicine.