Early Amphibian (Anuran) Morphogenesis Is Sensitive to Novel Gravitational Fields
1993; Elsevier BV; Volume: 155; Issue: 1 Linguagem: Inglês
10.1006/dbio.1993.1024
ISSN1095-564X
AutoresAnton W. Neff, Hiroki Yokota, Hae‐Moon Chung, Masami Wakahara, George M. Malacinski,
Tópico(s)Genetics, Aging, and Longevity in Model Organisms
ResumoAnuran amphibian embryos (Xenopus laevis and Rana dybowskii) are sensitive to novel gravitational fields. Under simulated weightlessness, (i) the location of the first horizontal cleavage furrow was shifted toward the vegetal pole at the eight-cell stage; (ii) the position of the blastocoel was more centered, and the number of cell layers in the blastocoel roof was increased at the blastula stage; (iii) the dorsal lip appeared closer to the vegetal pole at the gastrula stage; and (iv) head and eye dimensions were enlarged at the hatching tadpole stage. Effects of simulated hypergravity were opposite to those of simulated weightlessness, except that hypergravity, unlike simulated weightlessness, reduced the number of primordial germ cells in feeding tadpoles. Despite those dramatic differences in the early embryogenesis, tadpoles at the feeding stage are largely indistinguishable from controls.
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