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Imidazoline receptor antisera-selected cDNA clone and mRNA distribution
1Department of Psychiatry, University of Mississippi Medical Center, Jackson 39216-4505, USA. jpiletz@psychiatry.umsmed.edu
Annals of the New York Academy of Sciences
|July 23, 1999
Summary
A novel gene, Imidazoline Receptor Antisera-Selected cDNA-1 (iras-1), encodes a protein linked to imidazoline binding. Its mRNA levels in rat tissues correlate with imidazoline binding sites, suggesting a role in their regulation.
Area of Science:
- Molecular Biology
- Neuroscience
- Biochemistry
Background:
- A novel cDNA, Imidazoline Receptor Antisera-Selected cDNA-1 (iras-1), has been identified.
- The iras-1 gene encodes a 167-kD protein, with predicted peptides consistent with a known imidazoline binding protein.
Purpose of the Study:
- To quantify the expression levels of two iras mRNA forms (6.0 and 9.5 kb) in various fresh rat tissues.
- To investigate the correlation between iras mRNA levels and imidazoline binding site density.
Main Methods:
- Quantitative analysis of iras mRNA (6.0 and 9.5 kb) in rat tissues using techniques likely involving Northern blotting or RT-PCR.
- Statistical correlation analysis between total iras mRNA levels and I1 imidazoline binding capacity (BMAX), with normalization for housekeeping genes.
Main Results:
- Distinct tissue-specific expression patterns were observed for the two iras mRNA forms.
- Brain predominantly expressed the 6.0 kb iras mRNA, while liver and lung showed higher levels of the 9.5 kb form.
- A significant positive correlation (p = 0.71, p = 0.05) was found between total iras mRNA levels and I1 imidazoline binding site density across rat tissues.
Conclusions:
- Total iras mRNA levels are approximately proportional to the density of I1-imidazoline binding sites in rat tissues.
- The iras-1 gene product is likely involved in the regulation or function of imidazoline binding sites.