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Type II collagen distribution during cranial development in Xenopus laevis
D W Seufert1, J Hanken, M W Klymkowsky
1Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder 80309-0334.
Anatomy and Embryology
|January 1, 1994
Summary
Type II collagen, crucial for embryonic skull development, shows transient expression in Xenopus laevis. Its distribution suggests a role in vertebrate cranial patterning, though timing may not support early neural crest cell guidance.
Area of Science:
- Developmental Biology
- Molecular Biology
- Evolutionary Biology
Background:
- Epithelially expressed type II collagen is implicated in vertebrate embryonic skull patterning and differentiation.
- Most data supporting this role originate from amniote studies.
Purpose of the Study:
- To investigate the spatiotemporal distribution of type II collagen in the embryonic head of Xenopus laevis.
- To compare this expression pattern with that observed in amniotes and assess its role in cranial development.
Main Methods:
- Whole-mount and serial-section immunohistochemical analysis of Xenopus laevis embryos (stages 21-39).
- Focus on the period of cranial neural crest cell migration and preceding neurocranial chondrogenesis.
Main Results:
- Transient expression of type II collagen observed from at least stage 21, peaking at stages 33/34 and 35/36.
- Collagen-positive regions include the brain's ventrolateral surface, sensory vesicles, notochord, oropharynx, and integument.
- Expression pattern shows similarities and differences compared to mouse and avian embryos, indicating phylogenetic conservation.
Conclusions:
- Epithelially expressed type II collagen is a phylogenetically widespread feature of vertebrate cranial development.
- While collagen-positive areas are adjacent to future chondrogenesis sites, its late expression post-neural crest migration challenges a role in patterning via cell entrapment.