Morphogenesis and Pattern Formation in Hydroids

Webster, Gerald

doi:10.1111/j.1469-185x.1971.tb01178.x

Cited by 119 publications

(20 citation statements)

References 77 publications

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“…Many studies have been carried out examining regeneration, polarity of regeneration, budding, and cell differentiation in hydra (reviewed by Kanaev, 1952;Tardent, 1963;Burnett, 1966;Webster, 1971). These processes have been studied at the tissue level of organization, or if at the cellular level, then only qualitatively.…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of cell types during growth and morphogenesis in Hydra

Bode

Berking

David

et al. 1973

W. Roux' Archiv f. Entwicklungsmechanik

250

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Sum~J,z~ry. Tissue maceration was used to determine the absolute number and the distribution of eel] types in Hydra. It was shown that the total number of cells per animal as well as the distribution of cells vary depending on temperature, feeding eonditions, and state of growth. During head and foot regeneration and during budding the first detectable change in the cell distribution is an increase in the number of nerve cells at the site of morphogenesis. These results and the finding that nerve cells are most concentrated in the head region, diminishing in density down the body column, are discussed in relation to tissue polarity.

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Section: Introductionmentioning

confidence: 99%

Quantitative analysis of cell types during growth and morphogenesis in Hydra

Bode

Berking

David

et al. 1973

W. Roux' Archiv f. Entwicklungsmechanik

250

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“…The experimental facts significant for the understanding of such a signal system have been repeatedly reviewed in recent years (Sondhi, 1963;Wolpert, 1969Wolpert, , 1971; Robertson , Cooke, 1975b. There are also excellent review articles available for particular developmental systems, such as insects (Counce and Waddington, 1972;Sander, 1976, Lawrence, 1970, the sea urchin (Czihak, 1975), planarians (Chandebois, 1975), and hydroids (Webster, 1971). Attempts toward a theoretic understanding led Wolpert ( 1969,1971) to the concept of positional information.…”

Section: H Meinhardtmentioning

confidence: 96%

“…On the other hand, the existing head has an inhibitory influence on the induction of a secondary head. This inhibition is highest in the head area but is detectable throughout the animal (for review see Webster, 1971). Table 1.…”

Section: Generation Of Structures By Autocatalysis and Lateral Inmentioning

confidence: 97%

Models for the ontogenetic development of higher organisms

Meinhardt

1978

Reviews of Physiology, Biochemistry and Pharmacology

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“…Extensive tissue transplantation experiments have been used to characterize the signals which control normal morphogenesis and regeneration in Hydra (Wolpert et al, 1971;Webster, 1971;MacWilliams et al, 1970;MaeWilliams, 1981a,b). These experiments will be summarized briefly in order to outline basic features of the signaling system.…”

Section: Role Of Morphogenetic Signals In Nerve Commitmentmentioning

confidence: 99%

Nerve commitment in Hydra

Venugopal

David

1981

Developmental Biology

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The kinetics of nerve commitment during head regeneration in Hydra were investigated using a newly developed assay for committed cells. Committed nerve precursors were assayed by their ability to continue nerve differentiation following explanation of small pieces of tissue. Committed nerve precursors appear at the site of regeneration within 6 hr after cutting and increase rapidly. The increase is localized to the site of regeneration and does not occur at proximal sites in the body column of the regenerate. The increase is delayed about 8-12 hr when regeneration occurs at sites lower in the body column. The results show, furthermore, that redistribution of committed precursors does not play a major role in the pattern of nerve differentiation during regeneration. Since the increase in committed nerves coincides with the increase in morphogenetic potential of the regenerating tissue, the results strengthen the idea that morphogenetic signals are involved directly in the control of nerve commitment in Hydra.

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Morphogenesis and Pattern Formation in Hydroids

Cited by 119 publications

References 77 publications

Quantitative analysis of cell types during growth and morphogenesis in Hydra

Quantitative analysis of cell types during growth and morphogenesis in Hydra

Models for the ontogenetic development of higher organisms

Nerve commitment in Hydra

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