منابع مشابه
Formation of the head organizer in hydra involves the canonical Wnt pathway.
Stabilization of beta-catenin by inhibiting the activity of glycogen synthase kinase-3beta has been shown to initiate axis formation or axial patterning processes in many bilaterians. In hydra, the head organizer is located in the hypostome, the apical portion of the head. Treatment of hydra with alsterpaullone, a specific inhibitor of glycogen synthase kinase-3beta, results in the body column ...
متن کاملAutoregulatory and repressive inputs localize Hydra Wnt3 to the head organizer.
Polarized Wnt signaling along the primary body axis is a conserved property of axial patterning in bilaterians and prebilaterians, and depends on localized sources of Wnt ligands. However, the mechanisms governing the localized Wnt expression that emerged early in evolution are poorly understood. Here we find in the cnidarian Hydra that two functionally distinct cis-regulatory elements control ...
متن کاملAn ancient chordin-like gene in organizer formation of Hydra.
Signaling centers or organizers play a key role in axial patterning processes in animal embryogenesis. The function of most vertebrate organizers involves the activity of secreted antagonists of bone morphogenetic proteins (BMPs) such as Chordin or Noggin. Although BMP homologs have been isolated from many phyla, the evolutionary origin of the antagonistic BMP/Chordin system in organizer signal...
متن کاملTentacle morphogenesis in hydra I. The role of head activator
Stimulation of tentacle-specific cell differentiation by the neuropeptide head activator was investigated in Hydra magnipapillata. Tentacle-specific sensory nerve cells were identified by a monoclonal antibody, NV1. Treatment of hydra with 1 pM head activator for 18 h stimulated differentiation of NV1 nerve cells and tentacle epithelial cells in tissue from the distal gastric region. Head tissu...
متن کاملCngsc, a homologue of goosecoid, participates in the patterning of the head, and is expressed in the organizer region of Hydra.
We have isolated Cngsc, a hydra homologue of goosecoid gene. The homeodomain of Cngsc is identical to the vertebrate (65-72%) and Drosophila (70%) orthologues. When injected into the ventral side of an early Xenopus embryo, Cngsc induces a partial secondary axis. During head formation, Cngsc expression appears prior to, and directly above, the zone where the tentacles will emerge, but is not ob...
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ژورنال
عنوان ژورنال: The International Journal of Developmental Biology
سال: 2012
ISSN: 0214-6282
DOI: 10.1387/ijdb.113448hb