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Related Experiment Videos

Positional signalling by Hensen's node when grafted to the chick limb bud.

A Hornbruch, L Wolpert

    Journal of Embryology and Experimental Morphology
    |June 1, 1986
    PubMed
    Summary

    Hensen's node exhibits polarizing activity in early chick embryos, capable of inducing extra digits. This signaling ability, crucial for limb development, shifts from the node to other embryonic regions by stage 10.

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    Area of Science:

    • Developmental Biology
    • Embryology
    • Molecular Signaling

    Background:

    • The developing limb bud requires precise signaling for pattern formation.
    • Hensen's node is a key structure in early avian embryonic development.
    • The polarizing region is known to influence digit specification.

    Purpose of the Study:

    • To investigate the polarizing activity of Hensen's node during chick embryogenesis.
    • To determine the temporal and spatial distribution of this signaling activity.
    • To compare the inductive capacity of Hensen's node with the established polarizing region.

    Main Methods:

    • Grafting experiments involving Hensen's node from various developmental stages (4-10) onto the chick limb bud anterior margin.
    • Analysis of induced digit formation in the host limb buds.
    • Observation of the location of polarizing activity within the embryo over time.

    Main Results:

    • Hensen's node displays polarizing activity from stage 4 to stage 10, inducing additional digits when grafted.
    • This activity is less potent than that of a grafted polarizing region.
    • By stage 10, polarizing activity diminishes in Hensen's node and appears posterior to it and in the flank wing region.

    Conclusions:

    • Hensen's node possesses the ability to generate a positional signal during early development.
    • The signaling mechanism in Hensen's node may be similar to that in the limb bud's polarizing region.
    • These findings support the concept of the polarizing region as a distinct signaling center.

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