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Expression cloning of a cDNA encoding a fish prolactin receptor
Summary
Researchers identified a tilapia prolactin (PRL) receptor using expression cloning. This receptor shares structural similarities with mammalian PRL receptors but has low amino acid identity, indicating unique teleost signaling.
Area of Science:
- * Endocrinology and comparative genomics of fish hormone receptors.
- * Molecular biology and protein structure-function relationships.
Background:
- * Prolactin (PRL) plays crucial roles in osmoregulation and reproduction in teleosts (fish).
- * Understanding PRL receptor structure is key to deciphering PRL signaling pathways in fish.
Purpose of the Study:
- * To isolate and characterize the prolactin receptor from tilapia (a teleost fish).
- * To compare the structural features of the tilapia PRL receptor with known mammalian and avian receptors.
Main Methods:
- * Expression cloning strategy using a freshwater tilapia kidney cDNA library.
- * Transfection of COS cells and screening with tilapia PRL188.
- * Northern blot analysis to determine transcript distribution.
Main Results:
- * Isolation of a single positive clone encoding the tilapia prolactin receptor.
- * The mature tilapia PRL receptor is 606 amino acids, with distinct extracellular features and a cytoplasmic domain containing signal transduction elements.
- * Northern blot revealed a single transcript localized in osmoregulatory and reproductive tissues.
Conclusions:
- * The tilapia prolactin receptor exhibits a conserved overall structure with mammalian long-form receptors.
- * Significant differences in extracellular domains suggest species-specific ligand binding and signaling.
- * Tissue-specific expression supports the known roles of PRL in tilapia physiology.