Dissecting the human BDNF locus: bidirectional transcription, complex splicing, and multiple promoters

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Brain-derived neurotrophic factor (BDNF) is crucial for nervous system development, physiology, and pathology.
• Understanding BDNF gene regulation is vital for neurological research.

Purpose of the Study:

• To elucidate the structure of the human BDNF gene.
• To identify and characterize alternative BDNF transcripts and their expression patterns.
• To investigate the regulatory mechanisms of human BDNF gene expression.

Main Methods:

• Gene structure elucidation and transcript identification.
• Analysis of gene expression in adult human tissues and brain regions.
• Determination of transcription initiation sites and promoter activity assays.
• Investigation of natural antisense RNA (antiBDNF) transcription and dsRNA formation.

Main Results:

• The human BDNF gene comprises 11 exons with nine functional promoters exhibiting tissue- and brain-region-specific usage.
• Complex alternative transcripts and noncoding natural antisense RNAs (antiBDNF) are transcribed from the BDNF locus.
• BDNF and antiBDNF transcripts form double-stranded RNA (dsRNA) duplexes in the human brain in vivo.

Conclusions:

• The human BDNF gene exhibits intricate transcriptional regulation involving multiple promoters and antisense RNAs.
• Anti-BDNF plays a significant role in regulating BDNF expression within the human brain.
• These findings provide new insights into the molecular mechanisms governing BDNF function in the human nervous system.