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Updated: Jun 1, 2026
Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1
Published on: May 27, 2016
Alternative promoter usage and differential expression of multiple transcripts of mouse Prkar1a gene
Abdul Rouf Banday1, Shafquat Azim, Mohammad Tabish
1Department of Biochemistry, AM University, Aligarh, Uttar Pradesh 202002, India.
Abstract:
Prkar1a gene encodes regulatory type 1 alpha subunit (RIα) of cAMP-dependent protein kinase (PKA) in mouse. The role of this gene has been implicated in Carney complex and many cancer types that suggest its involvement in physiological processes like cell cycle regulation, growth and/or proliferation. We have identified and sequenced partial cDNA clones encoding four alternatively spliced transcripts of mouse Prkar1a gene. These transcripts have alternate 5' UTR structure which results from splicing of three exons (designated as E1a, E1b, and E1c) to canonical exon 2. The designated transcripts T1, T2, T3, and T4 contain 5' UTR exons as E1c, E1a + E1b, E1a, and E1b, respectively. The transcript T1 corresponded to earlier reported transcript in GenBank. In silico study of genomic DNA sequence revealed three distinct promoter regions namely, P1, P2, and P3 upstream of the exons E1a, E1b, and E1c, respectively. P1 is non-CpG-related promoter but P2 and P3 are CpG-related promoters; however, all three are TATA less. RT-PCR analysis demonstrated the expression of all four transcripts in late postnatal stages; however, these were differentially regulated in early postnatal stages of 0.5 day, 3 day, and 15 day mice in different tissue types. Variations in expression of Prkar1a gene transcripts suggest their regulation from multiple promoters that respond to a variety of signals arising in or out of the cell in tissue and developmental stage-specific manner.
Insights
The mouse Prkar1a gene, crucial for cell cycle regulation, exhibits four alternatively spliced transcripts. These transcripts are differentially expressed across tissues and developmental stages, suggesting complex regulation by multiple promoters.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- The Prkar1a gene encodes the RIα subunit of cAMP-dependent protein kinase (PKA).
- Prkar1a is implicated in Carney complex and various cancers, suggesting roles in cell cycle regulation, growth, and proliferation.
Purpose of the Study:
- To identify and characterize alternatively spliced transcripts of the mouse Prkar1a gene.
- To investigate the regulatory mechanisms, including promoter regions and expression patterns, of Prkar1a transcripts.
Main Methods:
- Partial cDNA cloning and sequencing to identify alternative transcripts.
- In silico analysis of genomic DNA to identify promoter regions.
- RT-PCR to analyze transcript expression in different tissues and developmental stages.
Main Results:
- Four alternatively spliced Prkar1a transcripts (T1-T4) with distinct 5' UTRs were identified.
- Three distinct promoter regions (P1, P2, P3) were identified upstream of alternative 5' UTR exons.
- All four transcripts were expressed in late postnatal stages, with differential regulation observed in early postnatal stages across various tissues.
Conclusions:
- The alternative splicing of Prkar1a transcripts generates distinct 5' UTR structures.
- Multiple promoters likely regulate Prkar1a expression in a tissue- and developmental stage-specific manner.
- Differential expression suggests complex regulatory networks controlling Prkar1a function in physiological processes.
