Neuronal activity regulates alternative exon usage.

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Neuronal activity drives changes in gene transcription, impacting neuronal plasticity, molecular composition, and structure.
• While altered gene expression is known, the full complexity of activity-regulated transcription involves additional mechanisms like alternative splicing.

Purpose of the Study:

• To conduct a genome-wide survey identifying exons with altered expression due to neuronal activity in the murine hippocampus.
• To identify alternative activity-induced exon usage and predict alternative splicing events following generalized seizures.

Main Methods:

• Genome-wide microarray analysis of murine hippocampus at 1, 4, and 8 hours post-seizure.
• Application of bioinformatics approaches ANOSVA (ANalysis Of Splicing VAriation) and FIRMA (Finding Isoforms using Robust Multichip Analysis).
• Validation of selected splicing events using RNA sequencing, in situ hybridization, and reverse transcription PCR.

Main Results:

• Identification of numerous exons with increased expression levels following neuronal activity.
• Discovery of previously undescribed activity-regulated transcripts and splicing events.
• Validation of specific activity-dependent splicing events for genes including Homer1a, Ania3, and Rcan1.

Conclusions:

• Alternative splicing significantly contributes to the activity-dependent neuronal transcriptome.
• The study provides valuable datasets for future comparative expression analyses of neuronal activity.
• This work enhances the comprehensive understanding of the complex activity-dependent neuronal transcriptomic signature.