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Novel fibroblast growth factor 2 transcripts are expressed in mouse embryos
R P Dirks1, S J Potter, A E Griep
1Department of Anatomy, University of Wisconsin Medical School, Madison, WI 53706, USA.
Biochemical and Biophysical Research Communications
|September 28, 2001
Summary
Researchers found two new mouse fibroblast growth factor 2 (FGF-2) gene exons, 1b and 1c, enabling alternative splicing. These novel mRNA variants suggest new FGF-2 protein roles in mouse embryonic development.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- Fibroblast growth factor 2 (FGF-2), also known as basic FGF (bFGF), is a key signaling molecule.
- Alternative splicing is a crucial mechanism for generating protein diversity from a single gene.
Purpose of the Study:
- To identify novel exons and alternative splicing events in the mouse FGF-2 gene.
- To investigate the expression patterns of FGF-2 mRNA variants during mouse embryogenesis.
Main Methods:
- Reverse transcription polymerase chain reaction (RT-PCR) to detect specific mRNA sequences.
- Northern blot analysis to identify transcript sizes and hybridization patterns.
Main Results:
- Discovery of two novel exons, 1b and 1c, located downstream of the canonical exon 1a in the mouse FGF-2 gene.
- Identification of mRNAs containing exon 1c spliced to canonical exons 2 and 3 in various embryonic tissues.
- Detection of a 3.7-kb transcript in placenta and embryonic limb that hybridizes to an exon 1c probe.
- Prediction of an alternative FGF-2 (altFGF-2) polypeptide with a novel N-terminal domain due to exon 1c splicing to exon 2.
Conclusions:
- Multiple novel mRNA variants are transcribed from the mouse FGF-2 locus through alternative splicing.
- These alternative FGF-2 transcripts and their encoded proteins may play significant roles in mouse embryogenesis.