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Bovine thyrotropin receptor cDNA is characterized by full-length and truncated transcripts
D W Silversides1, A Houde, J F Ethier
1Department of Veterinary Biomedicine, Faculty of Veterinary Medicine, University of Montreal, St-Hyacinthe, Quebec, Canada.
Journal of Molecular Endocrinology
|April 1, 1997
Summary
Researchers cloned the bovine thyrotropin (TSH) receptor, revealing its structure and confirming its G-protein interaction. Alternative splicing and transcription start sites were also identified in this key thyroid gland receptor.
Area of Science:
- Molecular Biology
- Endocrinology
- Genomics
Background:
- The thyrotropin (TSH) receptor plays a crucial role in thyroid hormone regulation.
- Understanding TSH receptor structure and function is vital for studying thyroid disorders.
- Previous studies established the G-protein coupling pattern for TSH and gonadotropin receptors in various species.
Purpose of the Study:
- To determine the complete coding sequence of the bovine TSH receptor.
- To characterize the structural features and potential functional domains of the bovine TSH receptor.
- To investigate alternative splicing and transcriptional variations in bovine TSH receptor expression.
Main Methods:
- Modified PCR cloning strategy to obtain the complete coding sequence.
- Bioinformatic analysis to predict protein structure, molecular mass, and functional sites.
- Northern blot analysis to examine gene expression patterns in the bovine thyroid gland.
Main Results:
- The complete coding sequence for the bovine TSH receptor was derived, encoding a 763-amino acid protein.
- The receptor structure includes extracellular, transmembrane, and intracytoplasmic domains with conserved cysteine residues and potential glycosylation/phosphorylation sites.
- Alternative splicing resulted in a truncated receptor variant, and alternative transcriptional start sites were observed.
- Northern blot analysis confirmed specific expression in the bovine thyroid gland with distinct transcript sizes (9.3, 4.3, and 3.8 kb).
Conclusions:
- The bovine TSH receptor shares structural and functional similarities with orthologs from other species.
- Alternative splicing and transcriptional variations contribute to the complexity of bovine TSH receptor expression.
- This study provides a foundational molecular understanding of the bovine TSH receptor for further research in bovine endocrinology and thyroid function.