An antisense transcript from the Xenopus laevis bFGF gene coding for an evolutionarily conserved 24 kd protein.

Area of Science:

• Molecular Biology
• Developmental Biology
• Genetics

Background:

• Basic fibroblast growth factor (bFGF) plays crucial roles in cell growth, differentiation, and development.
• Understanding gene regulation mechanisms, including non-coding RNAs, is essential for comprehending biological processes.

Purpose of the Study:

• To identify and characterize novel transcripts related to the bFGF gene in Xenopus laevis oocytes.
• To investigate the nature and origin of a newly discovered antisense transcript.

Main Methods:

• Screening of a Xenopus laevis oocyte cDNA library using rat bFGF cDNA.
• Sequence analysis, including reverse complementary listing and open reading frame identification.
• Hybridization studies with single-stranded probes to determine transcription orientation.
• Genomic fragment analysis to understand transcript processing and splicing.

Main Results:

• Isolation of a 1.35 kb sequence containing exon III of the bFGF gene.
• Identification of a polyadenylated antisense transcript with an open reading frame for a 24,292 dalton protein.
• Confirmation that the transcript is antisense to the Xenopus bFGF gene.
• Evidence that the antisense transcript is processed from a larger precursor via splicing.
• Demonstration of evolutionary conservation of the antisense gene through comparison with human hepatoma transcripts.

Conclusions:

• A novel antisense transcript to the Xenopus bFGF gene has been identified.
• This antisense transcript is processed through splicing and originates from an evolutionarily conserved gene.
• The discovery suggests a potential regulatory role for antisense transcription in bFGF gene expression.