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Direct evidence of an essential role for extended involution in the specification of a dorsal marginal mesoderm during Cynops gastrulation
Author(s) -
Suzuki Akio S.,
Yamamoto Yoshiyuki,
Imoh Hiroshi
Publication year - 1997
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1046/j.1440-169x.1997.t01-1-00002.x
Subject(s) - gastrulation , mesoderm , ectoderm , nodal , notochord , paraxial mesoderm , fgf and mesoderm formation , biology , endoderm , involution (esoterism) , anatomy , germ layer , embryogenesis , embryo , microbiology and biotechnology , embryonic stem cell , neuroscience , genetics , consciousness , induced pluripotent stem cell , gene
It has been indicated that specification of the dorsal marginal mesoderm of the Cynops gastrula is established by vertical interactions with other layers, which occur during its extended involution. In the present study, when the prospective notochordal area of the early gastrula was almost completely removed together with the dorsal mesoderm‐inducing endoderm and most of the bottle cells, the D‐less gastrulas still formed the dorsal axis with a well‐differentiated notochord; in half of them, where the involution occurred bi‐laterally, twin axes were observed. On the other hand, when the wound of a D‐less gastrula was repaired by transplanting the ventral marginal zone and ectoderm, the formation of the dorsal axis was inhibited if the involution of the lateral marginal zone was prevented by the transplanted piece. The present study suggests that: (i) cells having dorsal mesoderm‐forming potency distribute farther laterally than the fate map; and (ii) the extended involution plays an essential role in the specification of the dorsal marginal mesoderm, especially in notochordal differentiation in normal Cynops embryogenesis.