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Evidence for alternative splicing in hepatic alpha 1B-adrenergic receptor gene expression
S M Jones1, C L Deng, V MacLeod
1Department of Physiology, University of Arkansas for Medical Sciences, Little Rock 72205, USA.
Journal of Receptor and Signal Transduction Research
|November 20, 1997
Summary
Researchers identified a new intron in the alpha 1B-adrenergic receptor (alpha 1B-AR) gene, revealing tissue-specific alternative splicing. This complexity in alpha 1B-AR gene regulation impacts adrenergic responsiveness.
Area of Science:
- Pharmacology
- Molecular Biology
- Genetics
Background:
- Alpha 1B-adrenergic receptors (alpha 1B-AR) mediate vital physiologic and pathologic functions in mammals.
- The alpha 1B-AR gene expresses multiple messenger RNAs (mRNAs) with tissue-specific distribution.
Purpose of the Study:
- To elucidate the 5'-untranslated regions (5'-UTRs) of diverse alpha 1B-AR gene transcripts.
- To investigate the role of alternative intron splicing in alpha 1B-AR gene expression.
Main Methods:
- Rapid amplification of cDNA ends (RACE) to identify gene structures.
- Ribonuclease protection assays and reverse transcription-polymerase chain reaction (RT-PCR) to analyze RNA splicing patterns.
Main Results:
- Discovery of a novel intron within the alpha 1B-AR gene upstream of the coding sequence.
- Evidence of tissue-specific alternative intron splicing, with distinct patterns observed in heart and liver tissues.
- Differential expression of alpha 1B-AR transcripts in various tissues due to alternative splicing.
Conclusions:
- The alpha 1B-AR gene exhibits complex regulatory mechanisms involving alternative intron splicing.
- Multiple alpha 1B-AR mRNA variants with distinct 5'-UTRs are generated, potentially modulating alpha 1B-adrenergic signaling.
- Findings highlight the intricate nature of alpha 1B-AR gene regulation and its functional implications.