Coincidence of otx2 and BMP4 signaling correlates with Xenopus cement gland formation
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چکیده
منابع مشابه
Coincidence of otx2 and BMP4 signaling correlates with Xenopus cement gland formation
We previously showed that otx2 activates ectopic formation of the Xenopus cement gland only in ventrolateral ectoderm, defining a region of the embryo permissive for cement gland formation. In this paper, we explore the molecular identity of this permissive area. One candidate permissive factor is BMP4, whose putative graded inhibition by factors such as noggin has been proposed to activate bot...
متن کاملIdentification of otx2 target genes and restrictions in ectodermal competence during Xenopus cement gland formation.
The homeobox gene otx2 is a key regulator of positional identity in vertebrates, however its downstream target genes and mechanism of action are not known. We have analyzed otx2 function during formation of the Xenopus cement gland, an organ that expresses otx2. The cement gland forms at early neurula from extreme anterior ectoderm and corresponds to the chin primordium of mammals. Previous stu...
متن کاملXpitx-1: a homeobox gene expressed during pituitary and cement gland formation of Xenopus embryos
Pitx-1 is a member of the family of bicoid-related vertebrate homeobox genes; it was originally identified as a tissue-specific transcriptional regulator of the proopiomelacortin gene. Here we report on the embryonic expression of Xpitx-1, which is expressed in the anterior neural ridge and in the cement gland Anlage during late gastrulation/early neurulation. In tadpole stage embryos Xpitx-1 t...
متن کاملPositive and negative signals modulate formation of the Xenopus cement gland.
The cement gland is a simple secretory organ that marks the anterior-most dorsal ectoderm in Xenopus embryos. In this study, we examine the timing of cement gland induction and the cell interactions that contribute to cement gland formation. Firstly, we show that the outer ectodermal layer, from which the cement gland arises, becomes specified as cement gland by mid-gastrula. Curiously, at earl...
متن کاملDepletion of Bmp2, Bmp4, Bmp7 and Spemann organizer signals induces massive brain formation in Xenopus embryos.
To address the patterning function of the Bmp2, Bmp4 and Bmp7 growth factors, we designed antisense morpholino oligomers (MO) that block their activity in Xenopus laevis. Bmp4 knockdown was sufficient to rescue the ventralizing effects caused by loss of Chordin activity. Double Bmp4 and Bmp7 knockdown inhibited tail development. Triple Bmp2/Bmp4/Bmp7 depletion further compromised trunk developm...
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ژورنال
عنوان ژورنال: Mechanisms of Development
سال: 2000
ISSN: 0925-4773
DOI: 10.1016/s0925-4773(99)00342-1