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Ubiquitously expressed GPCR membrane-trafficking orthologs
Chris W Lehman1, Jaquelina D R Lee, Claire F Komives
1Department of Chemical and Materials Engineering, San Jose State University, 1 Washington Square, San Jose, CA 95192-0082, USA.
Genomics
|February 19, 2005
Summary
Researchers identified ODR-4, a protein crucial for olfactory receptor (OR) function and localization. This gene enables OR expression in new cell types, suggesting a conserved role in GPCR trafficking across species.
Area of Science:
- Molecular Biology
- Neuroscience
- Genetics
Background:
- Olfactory receptors (ORs) are G-protein-coupled receptors (GPCRs) vital for smell.
- Trafficking proteins are essential for targeting GPCRs to cellular membranes for proper function.
- A mutant protein in C. elegans (ODR-4) demonstrated defects in odorant response and receptor localization.
Purpose of the Study:
- To isolate and characterize the human homolog of the C. elegans ODR-4 gene.
- To investigate the conserved function of ODR-4 in olfactory receptor (OR) and G-protein-coupled receptor (GPCR) trafficking.
Main Methods:
- Utilized a novel RecA-based gene enrichment procedure to isolate full-length human cDNA.
- Performed protein homology analysis between human ODR-4 and its C. elegans counterpart.
- Analyzed gene expression patterns across various human, mouse, and rat tissues.
Main Results:
- Successfully isolated a full-length human cDNA homologous to C. elegans ODR-4.
- Identified a conserved family of ODR-4 orthologs with predicted structural similarities, indicating conserved function.
- Detected ODR-4 gene expression in a high percentage (41 of 44) of tested mammalian tissues.
Conclusions:
- The human ODR-4 gene is a functional homolog of its C. elegans counterpart.
- ODR-4 plays a conserved role in the trafficking and functional expression of olfactory receptors and potentially other GPCRs.
- The widespread tissue expression suggests a fundamental role for ODR-4 in cellular trafficking pathways beyond olfaction.