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Planar Induction of Anteroposterior Pattern in the Developing Central Nervous System of Xenopus laevis
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Planar Induction of Anteroposterior Pattern in the Developing Central Nervous System of Xenopus laevis
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Journal Article
Planar Induction of Anteroposterior Pattern in the Developing Central Nervous System of Xenopus laevis
1992
Overview
It has long been thought that anteroposterior (A-P) pattern in the vertebrate central nervous system is induced in the embryo's dorsal ectoderm exclusively by signals passing vertically from underlying, patterned dorsal mesoderm. Explants from early gastrulae of the frog Xenopus laevis were prepared in which vertical contact between dorsal ectoderm and mesoderm was prevented but planar contact was maintained. In these, four position-specific neural markers (engrailed-2, Krox-20, XIHbox 1, and XIHbox 6) were expressed in the ectoderm in the same A-P order as in the embryo. Thus, planar signals alone, following a path available in the normal embryo, can induce A-P neural pattern.
Publisher
American Society for the Advancement of Science,American Association for the Advancement of Science
Subject
/ Biological and medical sciences
/ Cell Adhesion Molecules, Neuronal - analysis
/ Central Nervous System - embryology
/ Developmental neurophysiology
/ Early stages. Segmentation. Gastrulation. Neurulation
/ Ectoderm
/ Embryo, Nonmammalian - cytology
/ Embryo, Nonmammalian - physiology
/ Embryology: invertebrates and vertebrates. Teratology
/ Embryos
/ Fundamental and applied biological sciences. Psychology
/ Growth
/ Mesoderm
/ RNA
/ Xenopus
