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Alternative splicing generates two forms of mRNA coding for human heparin-binding growth factor 1
I M Chiu1, W P Wang, K Lehtoma
1Department of Internal Medicine, Ohio State University, Columbus 43210.
Oncogene
|May 1, 1990
Summary
Human acidic fibroblast growth factor (HBGF-1) is crucial for cell growth and blood vessel formation. Researchers studied its gene structure and found it highly expressed in fetal hearts, suggesting a role in heart development.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- Human acidic fibroblast growth factor (HBGF-1) is a significant mitogen and angiogenic factor.
- HBGF-1 shares homology with several oncogenes and growth factors.
- Understanding HBGF-1's gene structure and expression is vital for comprehending its biological roles.
Purpose of the Study:
- To isolate and characterize human HBGF-1 cDNA clones.
- To investigate the gene structure of HBGF-1, including exon-intron boundaries.
- To determine the expression patterns of HBGF-1 mRNA in human tissues, particularly the fetal heart.
Main Methods:
- Isolation of cDNA clones from a human brain stem library.
- Nucleotide sequence analysis to identify mRNA variants and gene structure.
- RNAase protection assays to analyze transcript abundance and termination sites.
- Restriction enzyme mapping and sequencing of genomic DNA.
Main Results:
- Four HBGF-1 cDNA clones were isolated, revealing alternative splicing in the 5'-untranslated regions, potentially due to alternative promoters.
- A minor transcript contained a polyadenylation signal and tail, while the majority of mRNA terminated significantly downstream.
- Genomic DNA analysis mapped the distances between protein-coding exons.
- High levels of HBGF-1 mRNA were detected in the human fetal heart.
Conclusions:
- Alternative splicing and promoter usage generate distinct HBGF-1 mRNA forms.
- The unusually long 3'-untranslated sequence of HBGF-1 mRNA warrants further investigation.
- HBGF-1 is likely involved in embryonic development and vascular growth within the heart.