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Altered proteoglycan synthesis disrupts feather pattern formation in chick embryonic skin
1La Jolla Cancer Research Foundation, Cancer Research Center, La Jolla, California 92037.
Developmental Biology
|May 1, 1988
Summary
Proteoglycans are crucial for establishing embryonic feather patterns. Disrupting their structure with xylosides causes feather rudiment fusion, indicating a key role in pattern development, not maintenance.
Area of Science:
- Developmental Biology
- Extracellular Matrix Biology
- Cell Biology
Background:
- Proteoglycans are essential components of the extracellular matrix.
- Feather pattern development in avian embryos is a complex process involving cell-cell and cell-matrix interactions.
Purpose of the Study:
- To investigate the role of proteoglycans in the establishment and maintenance of embryonic feather patterns.
- To determine if altering proteoglycan structure affects feather pattern formation.
Main Methods:
- Culturing 7-day-old embryonic chick skins in a medium containing para-nitrophenyl-beta-D-xyloside (2 mM).
- Xylosides were used to inhibit proteoglycan synthesis by acting as exogenous glycosaminoglycan acceptors.
- Observed and analyzed changes in feather pattern formation and proteoglycan structure.
Main Results:
- Xyloside treatment altered proteoglycan structure and disrupted feather pattern development, leading to the fusion of feather rudiments.
- The disruption occurred within the first 24 hours of culture, during the establishment of feather rows.
- The observed effects were reversible if treatment was stopped after 24 hours but not after 48 hours.
Conclusions:
- Proteoglycans play a critical role in the establishment of feather patterns but not in their maintenance.
- Feather pattern establishment and maintenance are under different developmental controls.
- A potential functional relationship exists between the extracellular matrix and cell adhesion molecules (like L-CAM) in feather pattern formation.