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Analysis of fra-2 gene expression
Nucleic Acids Research
|June 11, 1993
Summary
The fra-2 gene in chicken cells is regulated similarly to c-fos but with delayed and prolonged responses. Transcriptional analysis reveals key promoter elements and serum-inducible protein binding, crucial for understanding gene regulation.
Area of Science:
- Molecular Biology
- Gene Regulation
- Cellular Signaling
Background:
- The fra-2 gene, a member of the immediate-early gene family, plays a role in cellular responses.
- Understanding its transcriptional regulation is key to deciphering cellular signaling pathways.
Purpose of the Study:
- To analyze the transcriptional regulation of the fra-2 gene in chicken embryo fibroblasts.
- To compare fra-2 regulation with that of the related c-fos gene.
Main Methods:
- Analysis of fra-2 transcript induction by phorbol ester, cAMP, calcium ionophore, and serum.
- Identification of transcriptional start sites and promoter elements using deletion constructs and transfection assays.
- Assessment of protein complex binding to AP-1 sequences.
Main Results:
- Fra-2 gene expression, like c-fos, is inducible by various stimuli but shows delayed and prolonged transcript induction (5.7 kb and 6.8 kb species).
- Transcript size heterogeneity is due to alternative polyadenylation.
- The promoter contains enhancer consensus sequences (SCM, SRE, GC boxes, CRE-like), but serum induction is mediated by a minimal fragment independent of the SRE-like sequence.
- Serum induces binding activity of protein complexes to AP-1 sequences within the gene.
Conclusions:
- Fra-2 transcriptional regulation shares similarities with c-fos but exhibits distinct kinetic properties.
- Serum induction of fra-2 involves complex regulatory elements, with AP-1 site binding activity being modulated by serum stimulation.