Bimodal functions of Notch-mediated signaling are involved in neural crest formation during avian ectoderm development.
Neural crest is induced at the junction of epidermal ectoderm and neural plate by the mutual interaction of these tissues. In previous studies, BMP4 has been shown to pattern the ectodermal tissues, and BMP4 can induce neural crest cells from the neural plate. In this study, we show that epidermally expressed Delta1, which encodes a Notch ligand, is required for the activation and/or maintenance of Bmp4 expression in this tissue, and is thus indirectly required for neural crest induction by BMP4 at the epidermis-neural plate boundary. Notch activation in the epidermis additionally inhibits neural crest formation in this tissue, so that neural crest generation by BMP4 is restricted to the junction.
Endo
Yukinori
Y
Department of Developmental Neurobiology, Graduate School of Medicine, Tohoku University, Sendai, Miyagi 980-8575, Japan.
Osumi
Noriko
N
Wakamatsu
Yoshio
Y
D000818:Animals; D055415:Bone Morphogenetic Protein 4; D019485:Bone Morphogenetic Proteins / Q000378:metabolism; D003370:Coturnix; D004475:Ectoderm / Q000502:physiology*; D018274:Electroporation; D004817:Epidermis; D015870:Gene Expression; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D009432:Neural Crest / Q000196:embryology* / Q000502:physiology; D051881:Receptor, Notch1; D011956:Receptors, Cell Surface; D015398:Signal Transduction; D014157:Transcription Factors
D055415:Bone Morphogenetic Protein 4; D019485:Bone Morphogenetic Proteins; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D051881:Receptor, Notch1; D011956:Receptors, Cell Surface; D014157:Transcription Factors; C064045:delta protein