By CIBA Foundation Symposium
Participants to this symposium specialize in the interface among genes and cells, protecting genetic research, cloning experiences, and the research of telephone lineages and mobile interactions. They notice how the physique axes are already decided within the eggs of invertebrates and amphibia, then think about the mechanisms because the egg cleaves, in annelids, arthropods, amphibia, and mice that underlie assignation of cells to express lineages, which offer upward push to diversified tissues within the grownup. last chapters signify the molecules that mediate each one cell's specific destiny, its place within the ultimate physique plan because the results of cellphone sorting or, on occasion, telephone migration.
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Additional resources for Ciba Foundation Symposium 144 - Cellular Basis of Morphogenesis
Secondarily, these experiments suggest that the level of Xhox3 may be set by different combinations or concentrations of growth factors which act during gastrulation. g. for growth factors, which in turn set the level of Xhox3 expression (Ruiz i Altalba & Melton 1989a). Axis formation in Xenopus embryogenesis 27 Obviously, the details of how the level of Xhox3 effects A-P pattern are not clear. We d o not know which genes are controlled by Xhox3 expression nor how these differences in expression are related to induction and pattern formation.
In contrast, longitudinal separation of the embryo into a right and a left portion leads to the formation of more than the normal number of pattern elements and in extreme cases the two partial embryos each reorganize to form two complete patterns such that identical twins result. Depending on the taxon to which the insect species belongs, twinning can be induced until quite late in development, well after gastrulation. The ability to produce two complete sets of dorsoventral patterns in one egg indicates that the mechanisms operating in the dorsoventral axis have great self-regulative properties, while pre-localization appears to play a rather subordinate role, if any (reviewed in Sander 1976).
It just emphasizes our ignorance of what genes are involved. Heasman: Concerning the Drosophila syncytium not being comparable with the Xenopus situation, would it be possible t o go back to the Xenopus oocyte and make the comparison, because that is the stage when the asymmetry of VgZ is set up. Is that more comparable to the syncytial stage of Drosophila? Scott:As far as the zygotically active homeobox genes are concerned, the syncytium could be a red herring in some cases. There are certainly molecules that are anchored in a way that we don’t understand in the Drosophila embryo, as apparently there are in Xenopus.
Ciba Foundation Symposium 144 - Cellular Basis of Morphogenesis by CIBA Foundation Symposium