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Summary
Researchers isolated feather keratin messenger RNA (mRNA) from embryonic chicks and created complementary DNA (cDNA). This revealed 25-35 distinct mRNA species and 100-240 keratin genes in the chick genome.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genomics
Background:
- Embryonic chick feathers contain homologous polypeptide chains known as keratins.
- Understanding keratin gene families is crucial for developmental biology.
Purpose of the Study:
- To characterize the complexity of keratin gene families in embryonic chicks.
- To determine the number of keratin mRNA species and genes in the chick genome.
Main Methods:
- Isolation of pure mRNA coding for embryonic chick feather keratins.
- Complementary DNA (cDNA) synthesis using avian myeloblastosis virus reverse transcriptase.
- Hybridization and reannealing kinetics studies of cDNA.
Main Results:
- Identified 25-35 different keratin mRNA species in embryonic chick feathers.
- Estimated 100-240 keratin genes in the chick genome.
- Each keratin gene comprises unique and repetitive sequences.
Conclusions:
- The repetitive sequences likely represent keratin coding regions.
- Unique sequences are proposed to correspond to untranslated regions of the mRNA.
- This study provides insights into the genomic organization of keratin genes in birds.