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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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Related Experiment Video

Updated: Apr 18, 2026

Tracking Morphogenetic Tissue Deformations in the Early Chick Embryo
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Patterning in time and space: HoxB cluster gene expression in the developing chick embryo.

Analuce Gouveia1, Hugo M Marcelino, Lisa Gonçalves

  • 1a Life and Health Sciences Research Institute (ICVS); School of Health Sciences , University of Minho ; Braga , Portugal.

Cell Cycle (Georgetown, Tex.)
|January 21, 2015
PubMed
Summary

Early chick embryo development reveals temporal and spatial collinearity in HoxB gene activation. HoxB2 expression cycles with somite formation, linking timely tissue specification to segmentation.

Keywords:
A-P, anterior-posteriorHH, Hamburger and HamiltonHox codeHox genesPSM, presomitic mesodermchick embryonc, notochordnt, neural tubeps, primitive streakspatial collinearitytemporal collinearitytemporal control

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Hox genes are crucial for establishing tissue identity during embryonic development.
  • The precise temporal regulation of Hox gene expression is critical but poorly understood.
  • A detailed temporal framework for Hox gene activation is needed.

Purpose of the Study:

  • To characterize the temporal and spatial expression patterns of the HoxB cluster in the early chick embryo.
  • To investigate the relationship between Hox gene activation timing and embryonic segmentation.

Main Methods:

  • Detailed temporal and spatial analysis of HoxB cluster gene expression in chick embryos.
  • Explant cultures of early chick embryos were used to study gene expression dynamics.

Main Results:

  • Demonstrated clear temporal collinearity in the activation of HoxB cluster genes.
  • Observed spatial collinearity of HoxB gene expression across different developmental stages and tissues.
  • Showed cyclic expression of HoxB2 in the presomitic mesoderm, synchronized with somite formation.

Conclusions:

  • Established a molecular framework for understanding HoxB gene regulation in time and space.
  • Suggests a direct link between the timing of tissue specification and the segmentation clock.
  • Provides a foundation for future research into the regulatory mechanisms of Hox gene expression.