Cortical rotation of the Xenopus egg: Consequences for the anteroposterior pattern of embryonic dorsal development

J. Gerhart, Michael Danilchik, T. Doniach, S. Roberts, B. Rowning, R. Stewart

Research output: Contribution to journalArticle

320 Citations (Scopus)

Abstract

We first review cortical-cytoplasmic rotation, a microtubule-mediated process by which the Xenopus egg, like other amphibian eggs, transforms its polarized cylindrical symmetry into bilateral symmetry within the first cell cycle after fertilization. This transformation, the earliest of many steps leading to dorsal development, involves the displacement of the egg's cortex relative to its cytoplasmic core by 30Γ in an animal-vegetal direction. As rotation is progressively reduced by microtubule-depolymerizing agents, embryos develop with body axes progressively deleted for dorsal structures at the anterior end. With no rotation, ventralized embryos are formed. In an effort to comprehend this progressive effect on embryonic organization, we go on to review subsequent developmental processes depending on rotation, and we propose, with evidence, that reduced rotation leads to a reduced number of vegetal dorsalizing cells, which induce during the blastula stage a Spemann organizer region of smaller than normal size. The reduced organizer then promotes a reduced amount of cell rearrangement (morphogenesis) at gastrulation. Reduced morphogenesis seems the proximate cause of the incompleteness of axial pattern, as shown further by the fact that embryos that are normal until the gastrula stage, if exposed to inhibitors of morphogenesis, develop body axes that are progressively less complete in their anterior dorsal organization the earlier their gastrulation had been blocked. We discuss why axial pattern might depend systematically on morphogenesis.

Original languageEnglish (US)
Pages (from-to)37-51
Number of pages15
JournalDevelopment
Volume107
Issue numberSUPPL.
StatePublished - 1989
Externally publishedYes

Fingerprint

Xenopus
Embryonic Development
Ovum
Morphogenesis
Gastrulation
Embryonic Structures
Microtubules
Embryonic Organizers
Blastula
Gastrula
Amphibians
Fertilization
Eggs
Cell Cycle

Keywords

  • anteroposterior pattern
  • cortical rotation
  • DO
  • dorsoventral pattern
  • FGF
  • gastrulation
  • lithium
  • mesoderm induction
  • microtubules
  • organizer
  • polarity
  • TGFβ
  • Xenopus laevis

ASJC Scopus subject areas

  • Anatomy
  • Cell Biology

Cite this

Gerhart, J., Danilchik, M., Doniach, T., Roberts, S., Rowning, B., & Stewart, R. (1989). Cortical rotation of the Xenopus egg: Consequences for the anteroposterior pattern of embryonic dorsal development. Development, 107(SUPPL.), 37-51.

Cortical rotation of the Xenopus egg : Consequences for the anteroposterior pattern of embryonic dorsal development. / Gerhart, J.; Danilchik, Michael; Doniach, T.; Roberts, S.; Rowning, B.; Stewart, R.

In: Development, Vol. 107, No. SUPPL., 1989, p. 37-51.

Research output: Contribution to journalArticle

Gerhart, J, Danilchik, M, Doniach, T, Roberts, S, Rowning, B & Stewart, R 1989, 'Cortical rotation of the Xenopus egg: Consequences for the anteroposterior pattern of embryonic dorsal development', Development, vol. 107, no. SUPPL., pp. 37-51.
Gerhart, J. ; Danilchik, Michael ; Doniach, T. ; Roberts, S. ; Rowning, B. ; Stewart, R. / Cortical rotation of the Xenopus egg : Consequences for the anteroposterior pattern of embryonic dorsal development. In: Development. 1989 ; Vol. 107, No. SUPPL. pp. 37-51.
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