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Expression pattern of Dll4 during chick embryogenesis.

Suresh Nimmagadda1, Poongodi Geetha-Loganathan, Felicitas Pröls

  • 1Institute of Anatomy and Cell Biology, Department of Molecular Embryology, University of Freiburg, Albertstrasse 17, 79104, Freiburg, Germany.

Histochemistry and Cell Biology
|July 3, 2007
PubMed
Summary
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Chick Delta-like 4 (Dll4) is crucial for cell-fate decisions. This study details cDll4 expression in chick embryos, revealing its role in vascular development and arterial endothelial cell differentiation.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Signaling

Background:

  • Notch and Delta signaling pathways mediate cell-to-cell interactions essential for cell-fate determination across various organisms.
  • Delta-like 4 (Dll4) is a key ligand in the Notch pathway, implicated in vascular development and angiogenesis.

Purpose of the Study:

  • To isolate and characterize the expression pattern of chick Delta-like 4 (Dll4) cDNA during embryonic development.
  • To investigate the role of cDll4 in chick embryogenesis, particularly in vascular development and cell differentiation.

Main Methods:

  • Isolation of a 696 bp fragment of chick Delta-like 4 (Dll4) cDNA.
  • Analysis of cDll4 expression patterns using in situ hybridization from Hamburger-Hamilton (HH) stage 8 to 30 in chick embryos.

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Main Results:

  • Detailed spatio-temporal expression of cDll4 was described from HH-stage 8-30.
  • Dll4 expression was observed in extraembryonic tissues, the dorsal aorta, embryonic blood vessels, heart, somites, neural tube, limb, pharyngeal arches, esophagus, and the developing eye.
  • cDll4 was notably absent from venules and identified as a marker for arterial endothelial cells, consistent with findings in mice.

Conclusions:

  • Chick Dll4 is expressed broadly across numerous tissues and organs during embryogenesis.
  • The expression pattern strongly suggests a significant role for Dll4 in vascular development and arterial endothelial cell specification in chick embryos.