scholarly journals Secondary embryonic axis formation by transplantation of D quadrant micromeres in an oligochaete annelid

Development ◽  
2010 ◽  
Vol 138 (2) ◽  
pp. 283-290 ◽  
Author(s):  
A. Nakamoto ◽  
L. M. Nagy ◽  
T. Shimizu
Keyword(s):  
Embryonic Axis ◽  
Axis Formation ◽  
Oligochaete Annelid

The correlation between patterns of dye transfer junctions and future developmental fate in Xenopus: u.v. irradiation and lithium treatment

Development ◽  
1989 ◽  
Vol 105 (4) ◽  
pp. 747-752 ◽  
Author(s):  
D.J. Nagajski ◽  
S.C. Guthrie ◽  
C.C. Ford ◽  
A.E. Warner
Keyword(s):  
Lucifer Yellow ◽  
Lithium Treatment ◽  
Cell Communication ◽  
Embryonic Axis ◽  
Axis Formation ◽  
Dye Transfer ◽  
Cell Stage ◽  
The Future ◽  
Vegetal Pole ◽  
Cell Embryo

The correlation between cell-to-cell communication junctions at the 32-cell stage and the subsequent embryonic axis has been examined in Xenopus laevis Disturbances of embryonic axis formation were u.v. irradiation at the vegetal pole before 0.6 in the which generates embryos with dorsal axial embryos were treated with 100mM-lithium chloride 32-cell stage, which generates embryos with ventral The cell-to-cell transfer of Lucifer Yellow was used junctional permeability. Injections were made into cells, lying in tiers 1 and 2 of the 32-cell embryo, relative to the future dorsoventral axis of the embryo on the basis of differences in pigmentation. The Yellow transfer in the future dorsal half of the compared with that in the future ventral half for u.v.-irradiated and Li-treated embryos. Injected subsequently scored for axial developmenf for transfer frequencies. In control embryos at the 32- Yellow transfer was both more frequent and more dorsal regions than in future ventral regions, as In embryos that had been u.v. irradiated before 0.6 in cycle, Lucifer transfer was the same in both light and the animal hemisphere and at the low level ventral regions in normal embryos. These embryos reductions in dorsal axial structures. Embryos the first cell cycle, when u.v. irradiation no longer cytoplasmic movements initiated at fertilization, dorsoventral difference in Lucifer Yellow transfer and normal dorsoventral polarity. Embryos exposed to

Interactions between Wnt and Vg1 signalling pathways initiate primitive streak formation in the chick embryo

Development ◽  
2001 ◽  
Vol 128 (15) ◽  
pp. 2915-2927 ◽  
Author(s):  
Isaac Skromne ◽  
Claudio D. Stern
Keyword(s):  
Chick Embryo ◽  
Marginal Zone ◽  
Primitive Streak ◽  
Embryonic Axis ◽  
Normal Embryo ◽  
Signalling Pathways ◽  
Axis Formation ◽  
Distinct Region ◽  
Wnt Pathways ◽  
Area Pellucida

The posterior marginal zone (PMZ) of the chick embryo has Nieuwkoop centre-like properties: when transplanted to another part of the marginal zone, it induces a complete embryonic axis, without making a cellular contribution to the induced structures. However, when the PMZ is removed, the embryo can initiate axis formation from another part of the remaining marginal zone. Chick Vg1 can mimic the axis-inducing ability of the PMZ, but only when misexpressed somewhere within the marginal zone. We have investigated the properties that define the marginal zone as a distinct region. We show that the competence of the marginal zone to initiate ectopic primitive streak formation in response to cVg1 is dependent on Wnt activity. First, within the Wnt family, only Wnt8C is expressed in the marginal zone, in a gradient decreasing from posterior to anterior. Second, misexpression of Wnt1 in the area pellucida enables this region to form a primitive streak in response to cVg1. Third, the Wnt antagonists Crescent and Dkk-1 block the primitive streak-inducing ability of cVg1 in the marginal zone. These findings suggest that Wnt activity defines the marginal zone and allows cVg1 to induce an axis. We also present data suggesting some additional complexity: first, the Vg1 and Wnt pathways appear to regulate the expression of downstream components of each other’s pathway; and second, misexpression of different Wnt antagonists suggests that different classes of Wnts may cooperate with each other to regulate axis formation in the normal embryo.

scholarly journals Assisted fertilization and embryonic axis formation in higher primates

2009 ◽  
Vol 18 (3) ◽  
pp. 382-390 ◽  
Author(s):  
Karolina Piotrowska-Nitsche ◽  
Shang-Hsun Yang ◽  
Heather Banta ◽  
Anthony WS Chan
Keyword(s):  
Embryonic Axis ◽  
Axis Formation ◽  
Assisted Fertilization

scholarly journals The Mouse Fused Locus Encodes Axin, an Inhibitor of the Wnt Signaling Pathway That Regulates Embryonic Axis Formation

Cell ◽  
1997 ◽  
Vol 90 (1) ◽  
pp. 181-192 ◽  
Author(s):  
Li Zeng ◽  
François Fagotto ◽  
Tong Zhang ◽  
Wei Hsu ◽  
Thomas J Vasicek ◽  
...  
Keyword(s):  
Wnt Signaling ◽  
Signaling Pathway ◽  
Wnt Signaling Pathway ◽  
Embryonic Axis ◽  
Axis Formation
Sign in / Sign up

Export Citation Format

Share Document