Precocious appearance of the gray crescent in heat-shocked axolotl eggs

Benford, Helen H.; Namenwirth, Marion

doi:10.1016/s0012-1606(74)80020-5

Cited by 14 publications

(2 citation statements)

References 3 publications

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“…The present study revealed that the dorsalventral polarity of the Xenopus egg is reversed by a slight short-term heat-treatment. The temperature and the duration applied in the present study was lower and shorter than that used to study heat shock protein in Xenopus eggs (10) or early gray crescent formation in axolotl eggs (1). It is interesting that such a slight treatment causes such a remarkable alteration in the development of Xenopus eggs.…”

Section: Discussionmentioning

confidence: 86%

Heat‐Induced Reversal of Dorsal‐Ventral Polarity in Xenopus Eggs

Sakai

1990

Dev Growth Differ

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Heat‐treatment of fertilized Xenopus laevis eggs at 30°C induced; 1. conspicuous concentration of the pigment toward the sperm entry point (SEP), 2. eccentric first cleavage furrow formation, and 3. reversal of the dorsal‐ventral polarity of the embryos. The optimal treatment was for 2.5 min applied at 20 min postfertilization (p.f.). The rotation movement of the Nile‐blue stained spots in the vegetal hemisphere of the heated eggs accurately located the future dorsal midline as in untreated embryos (ref. 22). Exposure of eggs to D2O also reversed the dorsal‐ventral polarity of the embryo suggesting that stabilization of microtubules is involved in the dorsal‐ventral axis reversal.

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Section: Discussionmentioning

confidence: 86%

Heat‐Induced Reversal of Dorsal‐Ventral Polarity in Xenopus Eggs

Sakai

1990

Dev Growth Differ

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“…This implies that many eggs of Cynops are bilaterally but not radially symmetrical with respect to the materials in the PCM, since the PCMs in many oocytes in Cynops are more or less shifted to the periphery (see Table 1). With probable relevance to this, it has been reported that the grey crescents of varying distinctness appear in 60-80% of heat-shocked axolotl eggs even without penetration of the sperm (19), showing the existence of a bilateral symmetry prior to fertilization.…”

Section: Discussionmentioning

confidence: 88%

Distribution of the Germinal Vesicle Material during Progesterone‐Induced Oocyte Maturation in Xenopus and in Cynops

Imoh

Miyazaki

1984

Dev Growth Differ

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The distribution of the germinal vesicle material in the oocyte during progesterone‐induced maturation was studied in Xenopus and in Cynops. In both species, two distinctive masses of yolkfree cytoplasm appear in specific areas of the oocyte and at definite stages of maturation. One, the primary cytoplasmic mass, is formed at the basal side of the germinal vesicle during early maturation and is very RNA‐rich. In Xenopus, a large part of the primary cytoplasmic mass persists as a mass during maturation and ends up as a thin disk at the boundary between the animal and the vegetal hemisphere in the mature oocyte. In Cynops, a rod‐like primary cytoplasmic mass extends near to the equatorial zone and becomes indistinct in the mature oocyte. The other, the secondary cytoplasmic mass, is formed at or prior to germinal vesicle breakdown in areas around the germinal vesicle and is also RNA‐rich. The secondary cytoplasmic mass is dispersed and constitutes the RNA‐rich animal hemisphere cytoplasm in the mature oocyte. Observed results suggest that the primary and the secondary cytoplasmic mass contain different germinal vesicle materials.

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Developmental Potentialities of the Germ Layers in Mammals

Svajgert

Levak-Švajger

1976

Ciba Foundation Symposium 40 ‐ Embryogenesis in Mammals

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Precocious appearance of the gray crescent in heat-shocked axolotl eggs

Cited by 14 publications

References 3 publications

Heat‐Induced Reversal of Dorsal‐Ventral Polarity in Xenopus Eggs

Heat‐Induced Reversal of Dorsal‐Ventral Polarity in Xenopus Eggs

Distribution of the Germinal Vesicle Material during Progesterone‐Induced Oocyte Maturation in Xenopus and in Cynops

Developmental Potentialities of the Germ Layers in Mammals

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