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Characterization of the testes-specific pim-1 transcript in rat.
D Wingett1, R Reeves, N S Magnuson
1Department of Microbiology, Washington State University, Pullman 99164-4233.
Nucleic Acids Research
|June 25, 1992
Summary
The pim-1 gene produces different transcript sizes in somatic cells versus testes. Testes-specific transcripts are shorter and more stable, potentially impacting male germ cell development.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- The pim-1 proto-oncogene encodes a serine/threonine protein kinase.
- Pim-1 is expressed in hematolymphoid cells and germ cell lineages.
Purpose of the Study:
- To investigate the reason for different pim-1 transcript sizes in somatic cells and rat testes.
- To understand the functional significance of these transcript size differences.
Main Methods:
- Analysis of pim-1 gene expression in somatic cells and rat testes.
- Identification of alternate polyadenylation signals in the 3' untranslated region.
- Assessment of transcript stability.
Main Results:
- Somatic cells express a 2.8 kb pim-1 transcript, while rat testes express a shorter 2.3 kb transcript.
- The shorter testes-specific transcript results from alternate polyadenylation, removing a destabilizing A/U-rich element.
- The testes-specific pim-1 transcript exhibits greater stability compared to the somatic transcript.
Conclusions:
- Alternate polyadenylation regulates pim-1 transcript stability in a tissue-specific manner.
- The increased stability of the testes-specific pim-1 transcript may be crucial for translational regulation in post-meiotic male germ cells.