Expression of the rat BFGF antisense RNA transcript is tissue-specific and developmentally regulated

Area of Science:

• Molecular Biology
• Developmental Biology
• Gene Regulation

Background:

• Basic fibroblast growth factor (bFGF) gene locus produces various mRNA transcripts, including an antisense RNA.
• Natural antisense RNAs are implicated in regulating sense mRNA expression and turnover.
• Understanding the developmental expression of bFGF antisense RNA is crucial for deciphering its biological role.

Purpose of the Study:

• To investigate the developmental expression patterns of bFGF antisense transcripts in fetal and postnatal rat tissues.
• To explore the relationship between bFGF sense and antisense RNA expression across different tissues and developmental stages.

Main Methods:

• Northern hybridization using strand-specific cRNA probes to detect and quantify bFGF sense and antisense transcripts.
• Reverse transcription polymerase chain reaction (RT-PCR) to detect transcripts in midgestational embryos.
• Analysis of tissue and age-dependent expression levels.

Main Results:

• A 1.5-kb polyadenylated antisense RNA was detected in most rat tissues, with a 1.3-1.5 kb doublet in the brain.
• Brain exhibited an inverse relationship: bFGF sense transcript increased with postnatal development (days 3-30), while antisense decreased.
• In other tissues, antisense RNA levels rose significantly after birth, exceeding undetectable sense mRNA levels, with a tissue-specific regulatory pattern.

Conclusions:

• The reciprocal expression of bFGF sense and antisense transcripts in the developing brain suggests a potential regulatory function for antisense RNA.
• The relationship between sense and antisense RNA expression is tissue-specific, indicating diverse regulatory mechanisms.
• Further research is needed to elucidate the precise roles of bFGF antisense RNA in different developmental contexts.