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Characterization of a mouse beta 1-adrenergic receptor genomic clone
J A Cohen1, L A Baggott, C Romano
1Department of Neurology, University of Pennsylvania School of Medicine, Philadelphia 19104.
DNA and Cell Biology
|July 1, 1993
Summary
Researchers identified a mouse beta 1-adrenergic receptor (beta 1AR) clone, confirming its subtype and mapping its gene to chromosome 19. This discovery aids future studies on beta 1AR regulation and function.
Area of Science:
- Molecular Biology
- Genetics
- Pharmacology
Background:
- The beta 1-adrenergic receptor (beta 1AR) is a crucial G-protein-coupled receptor involved in various physiological processes.
- Understanding the specific characteristics and genetic location of the mouse beta 1AR is essential for comparative studies and functional analysis.
Purpose of the Study:
- To isolate and characterize a novel clone encoding the mouse beta 1-adrenergic receptor.
- To determine the gene's chromosomal localization and confirm its subtype identity.
- To investigate the transcriptional regulation and tissue-specific expression of the mouse beta 1AR.
Main Methods:
- Screening of a mouse liver genomic library using a human beta 2 AR cDNA probe.
- DNA sequencing, reverse transcription-polymerase chain reaction (RT-PCR), Southern blot analysis, and Northern blot analysis.
- Functional validation through binding studies in transfected cell lines (COS-7 and L-cells).
Main Results:
- A 1,395-bp open reading frame (Clone 5) encoding a 464-amino-acid polypeptide with characteristic G-protein-coupled receptor features was identified.
- Sequence analysis revealed high similarity to rat and human beta 1ARs, with notable differences in cytoplasmic loops.
- The gene was mapped to mouse chromosome 19, and Clone 5 was confirmed to encode a beta 1AR subtype expressed in brain, lung, and heart.
Conclusions:
- Clone 5 represents a functional mouse beta 1-adrenergic receptor.
- The identified gene localization and expression patterns provide a foundation for further research.
- This study offers critical data for investigating the beta 1AR's role in physiological and pathological conditions.