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Fig. 9. Hh signaling is required at the end of gastrulation for stomodeum
expression of pitx2 and proper crest cell
condensation. (A) No embryos treated with cyclopamine from 6-10 hpf
or 8-12 hpf express stomodeal pitx2 (blue bars) or condense crest on
the stomodeal roof (red bars). A small number of embryos treated with
cyclopamine from 10-14 hpf express pitx2 in the stomodeum and exhibit
condensation of anterior craniofacial crest cells, whereas the majority of
embryos treated between 14-22 hpf do express pitx2 in the stomodeum
and condense crest cells on the roof of the stomodeum. Control DMSO-treated
embryos all expressed pitx2 and undergo crest cell condensation
normally. (B-D) Effects of cyclopamine treatment on the condensation of
neural crest cells. Anterior craniofacial crest cells condense on the
stomodeal roof in control embryos (B) and embryos treated from 14-22 hpf (D);
however, this crest cell subpopulation fails to condense in embryos treated
from 6-10 hpf (C). (E,F) The anterior neurocranium is deleted in all
cyclopamine-treated embryos. n=10 in each treatment group for
pitx2 expression. Crest cell condensation and neurocranial cartilage
analysis: 6-10 hpf, n=25; 8-12 hpf, n=16; 10-14 hpf,
n=20; 14-22 hpf, n=21; control, n=14. Scale bars:
50 µm.
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