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You are here: Home / Associated publications / Belgian Journal of Zoology / Bibliographic References / Rauber's sickle generates only extraembryonic tissues junctonal- and sickle endoblast), and, by positional information, organizes and dominates the whole avian blastoderm (gastrulation, neurulation and blood island formation)

M Callebaut, E Van Nueten, H Bortier and F Harrisson (2003)

Rauber's sickle generates only extraembryonic tissues junctonal- and sickle endoblast), and, by positional information, organizes and dominates the whole avian blastoderm (gastrulation, neurulation and blood island formation)

BELGIAN JOURNAL OF ZOOLOGY, 133(1):45-59.

When the Rauber's sickle is (sub)totally mechanically removed from unincubated chicken blastoderms, their further evolution in culture is mostly disturbed. When,after removal of the chicken Rauber's sickle, a quail Rauber's sickle is placed isotopically, the normal development is totally restored. In such quail-chicken chimeras quail cells were found only in extraembryonic tissues, i.e. in junctional- and sickle endoblast and not among cells of the embryo proper (not in upper layer, nor in mesodermal, nor in endodermal cells). Further, we compared the inducing potencies of quail sickle endoblast placed on different regions of unincubated chicken blastoderms, either in the presence or absence of Rauber's sickle material. If a fragment of quail sickle endoblast was placed on the anti-sickle region of an unincubated chicken blastoderm from which the Rauber's sickle was (sub)totally removed, then often starting from this anti-sickle region an embryo presenting gastrulation and/or neurulation phenomena was induced but no blood islands were formed. So our study demonstrates that Rauber's sickle quantitatively and qualitatively dominates or inhibits ectopically-placed sickle endoblast. Earlier studies and the present study indicate the existence of a temporo-spatially bound cascade of gastrulation and neurulation phenomena and blood island formation in the avian blastoderm, starting from Rauber's sickle, the primary major organizer with inducing, inhibiting and dominating potencies.

avian blastoderm; Rauber's sickle; junctional endoblast; sickle endoblast; gastrulation; neurulation; blood island formation; positional information
BJZ

ISSN 2295-0451 (online version)
ISSN 0777-6279 (printed version)
impact factor 2015: 0,87.

Editor-in-Chief:
Prof. Dr. Isa Schön
Royal Belgian Institute of Natural Sciences
Vautierstraat 29
1000 Brussels, Belgium

 



1863-1903
Annales de la Société malacologique de Belgique
 
1903-1923
​Annales de la Société royale malacologique et zoologique de Belgique
 
1923-1989
Annales de la Société Royale Zoologique de Belgique
 
1989-
Belgian Journal of Zoology