Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Review
. 1985 Nov;89 Suppl:257-70.

Recent Advances in Our Understanding of the Temporal Control of Early Embryonic Development in Amphibians

  • PMID: 3913734
Free article
Review

Recent Advances in Our Understanding of the Temporal Control of Early Embryonic Development in Amphibians

N Satoh. J Embryol Exp Morphol. .
Free article

Abstract

Recent studies on temporal control of early amphibian development are reviewed. It is becoming clear that the development of an embryo is not timed by a single clock set in motion at fertilization, instead each developmental event seems to be timed by its own clock-like mechanism. The timing of developmental events is rigidly determined within embryonic cells, and usually can not be altered experimentally. One exception, however, is the timing of midblastula transition in amphibian embryos; recent studies have shown that its timing is regulated by the nucleocytoplasmic ratio. Several developmental events, particularly those associated with transcriptional activities, require DNA replication prior to their occurrence, suggesting an intimate relationship between DNA replication cycles and their onset. On the other hand, there are many other developmental events where timing is not controlled by the number of cell divisions, DNA replication cycles, or the nucleocytoplasmic ratio. Cytoplasmic machinery with autonomous oscillatory properties is thought to be involved in the timing of these events.

Similar articles

See all similar articles

Cited by 1 article

Publication types

LinkOut - more resources

Feedback