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frzb2xenopus mesodermal cell [+] 

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Experiment details for frzb2



A direct screen for secreted proteins in Xenopus embryos identifies distinct activities for the Wnt antagonists Crescent and Frzb-1.

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Gene Clone Species Stages Anatomy
frzb2 xenopus NF stage 10 to NF stage 12.5 mesodermal cell

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  Fig. 4. crescent is expressed in dorsal yolky cells of the blastocoele floor at blastula, in anterior mesendoderm at gastrula, and in the pronephros at tailbud stages. In situ hybridization with a crescent antisense probe was performed on sagittally hemisectioned (A–E,G) or on intact embryos (F,H). (A) Internal view of a hemisectioned blastula (stage 9) showing expression in the yolky dorsal blastocoele floor; most of the transcripts are still nuclear indicating the onset of transcription. (B,C) At later blastula (stages 9.5,10−) crescent labeled cells are found more vegetally in the deep layers of the dorsal endoderm. (D) At the onset of gastrulation (stage 10+) the expression in the deep cells intermingle with a new expression domain in the inner layer of the blastopore lip. (E) At stage 10.5 involuting anterior mesendoderm cells have increased transcript levels, whereas the expression in the leading edge of the dorsal endoderm weakens. (F) Dorsal view of a late gastrula (stage 12) showing expression in the prechordal plate and anterior (pharyngeal) endoderm. (G) Internal view of a late neurula (stage 16) showing strong staining in the anterior endoderm (ae) and in the prechordal plate (pp) underlying the developing forebrain. White arrowhead demarcates the anterior limit of the neural plate or head fold. (H) Late tailbud embryo (stage 28) in lateral view displaying expression in the pronephros (pn); note that expression in anterior endomesoderm has disappeared by this stage.