Fate map for the 32-cell stage ofXenopus laevis

Development (Cambridge) - Tập 99 Số 4 - Trang 527-551 - 1987
L. Dale1, J. M. W. Slack1
1University of Oxford Imperial Cancer Research Fund, Developmental Biology Unit , , Zoology Building, South Parks Road, Oxford, 0X1 3PS, UK

Tóm tắt

AbstractA complete fate map has been produced for the 32-cell stage of Xenopus laevis. Embryos with a regular cleavage pattern were selected and individual blasto-meres were injected with the lineage label fluorescein–dextran–amine (FDA). The spatial location of the clones was deduced from three-dimensional (3D) re-constructions of later stages and the volume of each tissue colonized by labelled cells in each tissue was measured.The results from 107 cases were pooled to give a fate map which shows the fate of each blastomere in terms of tissue types, the composition of each tissue by blastomere, the location of each prospective region on the embryo and the fate of each blastomere in terms of spatial localization.Morphogenetic movements up to stage 10 (early gastrula) were assessed by carrying out a number of orthotopic grafts at blastula and gastrula stages using donor embryos uniformly labelled with FDA.Although there is a regular topographic projection from the 32-cell stage this varies a little between individuals because of variability of positions of cleavage planes and because of short-range cell mixing during gastrulation. The cell mixing means that the topographic projection fails for anteroposterior segments of the dorsal axial structures and it is not possible to include short segments of notochord or neural tube or individual somites on the pregastrulation fate map.

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