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Titolo:
Tribolium embryogenesis: a SEM study of cell shapes and movements from blastoderm to serosal closure
Autore:
Handel, K; Grunfelder, CG; Roth, S; Sander, K;
Indirizzi:
Univ Freiburg, Inst Biol 1, D-79104 Freiburg, Germany Univ Freiburg Freiburg Germany D-79104 Biol 1, D-79104 Freiburg, Germany Max Planck Inst Entwicklungsbiol, D-72076 Tubingen, Germany Max Planck Inst Entwicklungsbiol Tubingen Germany D-72076 ingen, Germany
Titolo Testata:
DEVELOPMENT GENES AND EVOLUTION
fascicolo: 4, volume: 210, anno: 2000,
pagine: 167 - 179
SICI:
0949-944X(200004)210:4<167:TEASSO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCANNING ELECTRON-MICROSCOPY; FLOUR BEETLE TRIBOLIUM; DROSOPHILA-MELANOGASTER; EXPRESSION PATTERNS; CASTANEUM; GASTRULATION; SEGMENTATION; HOMOLOG; INSECTS; MUTANTS;
Keywords:
scanning electron microscopy; cell shape dynamics; gastrulation; amnion; serosa;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Sander, K Univ Freiburg, Inst Biol 1, Hauptstr 1, D-79104 Freiburg, Germany Univ Freiburg Hauptstr 1 Freiburg Germany D-79104 burg, Germany
Citazione:
K. Handel et al., "Tribolium embryogenesis: a SEM study of cell shapes and movements from blastoderm to serosal closure", DEV GENES E, 210(4), 2000, pp. 167-179

Abstract

Embryogenesis in the beetle Tribolium is of increasing interest to both molecular and evolutionary biology because it differs from the Drosophila paradigm by its type of segment specification (short- vs. long germ) and by the extensive epithelial envelopes - amnion and serosa - that are typical of most insects but not of higher dipterans. Using scanning electron microscopy of DAPI staged embryos we document development in Tribolium castaneum from blastoderm to completion of the envelopes, recording many details not otherwise accessible; we also provide a time table of the respective stages at30 degrees C. The nascent blastoderm cells remain basally confluent with the yolksac until after the 13th (=last synchronous) mitotic cycle. The cells in the prospective serosa - the first domain to segregate visibly from the uniform blastoderm - carry surface protrusions likely to contact the overlying vitelline envelope. The embryonic rudiment, the other (and larger) blastodermal domain, gives rise to amnion and germ anlage. In the latter, visible differentiation begins with a "primitive pit" reminiscent of the posterior midgut rudiment of Drosophila. The subsequent invagination of the mesoderm resembles Drosophila gastrulation, except in the head region where themedian groove extends through the entire preoral region. The prospective amnion starts differing visibly from the germ anlage during early gastrulation. It then folds underneath the spreading serosa and, advancing with the latter, closes the amniotic cavity at the ventral face of the germband. The largest (=posterior) amniotic fold covers a crestlike protrusion of the yolksac. Together with marked changes in the shape and arrangement of the amnion cells, this protrusion may contribute to the fold's elevation and early progress.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/21 alle ore 12:18:48