Related Experiment Videos
Expression of serum proteins in the developing chick embryo
1University of Texas, Department of Zoology, Austin 78712.
Insights
Chicken serum protein profiles change significantly during development. A specific embryonic antigen appears early, peaks at day 14, and disappears post-hatching, indicating distinct developmental changes in serum composition.
Area of Science:
- Biochemistry
- Developmental Biology
- Immunology
Background:
- Serum protein composition undergoes dynamic changes during embryonic development.
- Understanding these changes is crucial for comprehending avian development and physiology.
Purpose of the Study:
- To investigate embryonic-adult differences in chicken serum protein profiles.
- To identify and characterize specific antigens and proteins present during chicken development.
Main Methods:
- Sera from various embryonic stages and adult chickens were analyzed.
- Antisera against embryonic chick sera were used to detect specific antigens.
- Gel filtration, immunodiffusion, immunoelectrophoresis, and polyacrylamide gel electrophoresis were employed.
Main Results:
- A distinct embryonic antigen was identified, peaking at day 14 and absent post-hatching.
- This antigen has a molecular weight of approximately 160,000 Da.
- Serum components increased in quantity and diversity with development, with newly hatched chicks resembling adults.
- Both stage-specific and adult-specific proteins were detected, revealing qualitative and quantitative differences.
Conclusions:
- Chicken serum protein profiles exhibit significant qualitative and quantitative changes throughout embryonic development.
- Specific embryonic antigens and stage-specific proteins are present, highlighting developmental regulation.
- The transition from embryonic to adult serum composition is gradual, with newly hatched chicks showing adult-like profiles.
Abstract:
1. Sera from different embryonic stages of development and adult chickens were examined for embryonic-adult differences. 2. An antisera prepared in rabbits to 14 day embryonic chick sera revealed an antigen present in the early stages of embryonic development. The antigen reached a peak on day 14 and was not detectable 5 days post hatching. 3. Gel filtration studies in conjunction with immunodiffusion studies revealed the serum antigen to be in the 160,000 mol wt range. 4. Immunoelectrophoretic analyses of embryonic and adult sera revealed the sera components to increase in quantity and in numbers with development. The serum immunoelectrophoretic profile of newly hatch chick serum closely resembled sera from adult chickens. 5. Polyacrylamide gel electrophoretic comparisons of the sera of the developing chicks and the adult chickens revealed proteins specific to certain developmental stages as well as proteins specific to the adult serum. Qualitative and quantitative serum protein differences were found.