Potential of veg2 blastomeres to induce endoderm differentiation in sea urchin embryos.
Zoolog Sci
; 19(1): 81-5, 2002 Jan.
Article
em En
| MEDLINE
| ID: mdl-12025408
ABSTRACT
Two different modes of gastrulation in sea urchin embryos have been reported. The first mode, reported in Hemicentrotus pulcherrimus and some other species, consists of two phases a primary and a secondary invagination. The second mode involves gastrulation with a continuous convolution of cells near the blastopore; this mode has been reported to occur in the embryos of the sand dollar, Scaphechinus mirabilis. The rudimentary gut is comprised of fewer cells in the embryos of the former species than in the latter. We assumed that the differences in gastrulation modes could be related to the different potentials of the veg2 layer to induce endoderm differentiation in the upper layer. In the present study, we produced chimeric embryos consisting of an animal cap recombined with veg2 layer blastomere(s) to compare the inductive effect of the veg2 layer and/or the blastomere(s) in H. pulcherrimus and S. mirabilis embryos. Our results showed that the inductive effect of the veg2 layer is stronger in S. mirabilis embryos than in H. pulcherrimus embryos. Moreover, it was suggested that the difference in the strength of inductive effects of veg2 layers is related to the difference in gastrulation modes.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ouriços-do-Mar
/
Blastômeros
/
Embrião não Mamífero
/
Indução Embrionária
/
Endoderma
Limite:
Animals
Idioma:
En
Revista:
Zoolog Sci
Assunto da revista:
BIOLOGIA
Ano de publicação:
2002
Tipo de documento:
Article
País de afiliação:
Japão