Experimental studies on germinal localization in Ilyanassa. I. The role of the polar lobe in determination of the cleavage pattern and its influence in later development

@article{Clement1952ExperimentalSO,
  title={Experimental studies on germinal localization in Ilyanassa. I. The role of the polar lobe in determination of the cleavage pattern and its influence in later development},
  author={A. C. Clement},
  journal={Journal of Experimental Zoology},
  year={1952},
  volume={121},
  pages={593-625}
}
  • A. C. Clement
  • Published 1952
  • Biology
  • Journal of Experimental Zoology
Cell Lineage of the Ilyanassa Embryo: Evolutionary Acceleration of Regional Differentiation during Early Development
TLDR
A chronology of cell divisions in Ilyanassa to the stage of 84 cells (about 16 hours after first cleavage at 23°C), and spatial arrangements of identified nuclei at stages ranging from 27 to 84 cells are shown. Expand
Cell contact-dependent positioning of the D cleavage plane restricts eye development in the Ilyanassa embryo
TLDR
In embryos of the gastropod Ilyanassa obsoleta, the first-quartet micromere of the dorsal D lineage (1d) is smaller than the others, divides at a slower rate, and lacks the ability to form an eye, but it inherits more cytoplasm than normal, divides more rapidly, and frequently forms an eye. Expand
Specification of first quartet micromeres in Ilyanassa involves inherited factors and position with respect to the inducing D macromere.
  • H. Sweet
  • Biology, Medicine
  • Development
  • 1998
TLDR
Cell transplantation experiments demonstrate that the proximity of a first quartet micromere relative to the inducing D macromere is important for determining whether or not it will go on to develop an eye. Expand
Cell fate maps in the Ilyanassa obsoleta embryo beyond the third division.
  • J. Render
  • Biology, Medicine
  • Developmental biology
  • 1997
TLDR
Fate maps for second and third quartet micromeres as well as the mesentoblast cell (4d) and some of its derivatives and selected macromeres are created and discussed in terms of previous ablation experiments and mechanisms of cell fate specification in the I. obsoleta embryo. Expand
Variation in spiralian development: insights from polychaetes.
  • E. Seaver
  • Biology, Medicine
  • The International journal of developmental biology
  • 2014
TLDR
This review summarizes recent data from polychaete annelids, and highlights both conservation and variation in the cellular and molecular mechanisms that guide the spiral cleavage developmental program. Expand
Spiral cleavage and early embryology of a loxosomatid entoproct and the usefulness of spiralian apical cross patterns for phylogenetic inferences
TLDR
A broad comparison of cleavage types and apical cross patterns across Lophotrochozoa shows high plasticity of these character sets and it is argued that these developmental traits should be treated and interpreted carefully when used for phylogenetic inferences. Expand
Brefeldin A and monensin inhibit the D quadrant organizer in the polychaete annelids Arctonoe vittata and Serpula columbiana
TLDR
The results suggest that the D quadrant organizer is functionally conserved in equal‐cleaving polychaetes, but that details of its specification, induction, and patterning have diverged relative to other spiral-cleaving phyla. Expand
Cell specification and the role of the polar lobe in the gastropod mollusc Crepidula fornicata.
TLDR
Findings indicate that the embryos of C. fornicata follow the mode of development exhibited by equal-cleaving spiralians, which involves conditional specification of the D quadrant organizer via inductive interactions, presumably from the first quartet micromeres. Expand
Activin/Nodal signaling mediates dorsal–ventral axis formation before third quartet formation in embryos of the annelid Chaetopterus pergamentaceus
TLDR
The timing of the signal and the specific signaling pathway that mediates organizing activity in C. pergamentaceus was investigated and suggested that global body patterning mechanisms may not be as conserved across bilaterians as was previously thought. Expand
Functional evidence that Activin/Nodal signaling is required for establishing the dorsal-ventral axis in the annelid Capitella teleta
TLDR
Morpholino knockdown experiments in the annelid Capitella teleta demonstrate that the dorsal-ventral axis is primarily patterned by the Activin/Nodal pathway of the TGF-β superfamily, rather than by the BMP pathway. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 19 REFERENCES
THE EFFECTS OF HYDROSTATIC PRESSURE UPON THE POLAR LOBE AND CLEAVAGE PATTERN IN THE CHAETOPTERUS EGG
TLDR
Evidence is added which leads to the belief that polar lobe formation is primarily a cortical effect of the vegetative pole region, to a very large degree independent of the underlying cytoplasm or the mitotic apparatus. Expand
THE MECHANICS OF SEA URCHIN DEVELOPMENT, STUDIED BY OPERATIVE METHODS
TLDR
In the cleavage stages the sea urchin's egg can be divided into five transverse layers, an1, an2, veg1, veG2, and the micromeres, where the micromere material migrates into the blastocoele before gastrulation, forming the primary mesenchyme, which produces the skeletal rods. Expand
INVESTIGATIONS AS TO THE LOCALIZATION OF THE MICROMERE-, THE SKELETON-, AND THE ENTODERM-FORMING MATERIAL IN THE UNFERTILIZED EGG OF ARBACIA PUNCTULATA
TLDR
Animal halves of unfertilized eggs of Arbacia punctulata segmented equally and developed into larvae of animal type: blastule with enlarged apical tuft, and gastrulated, differentiating into ovoid larvae or plutei. Expand
The Inheritance of Sinistrality in Limnaea peregra (Mollusca, Pulmonata)
TLDR
A spiral mode of cleavage in the egg and a spiral twist in the soft parts of the adult seem to be essential qualities of gastropod mollusca, and an animal which is neither dextral nor sinistral is presumably impossible : the twist being obligatory there is no third alternative. Expand
...
1
2
...