Position-dependent FUS-RNA interactions regulate alternative splicing events and transcriptions.

Area of Science:

• Molecular Biology
• Neuroscience
• Genetics

Background:

• Fused in Sarcoma (FUS) is an RNA-binding protein crucial for gene regulation.
• FUS dysfunction is linked to amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD).

Purpose of the Study:

• To investigate FUS-mediated transcriptional and alternative splicing regulation in mouse neurons.
• To characterize FUS-binding RNA sites and their functional implications.

Main Methods:

• Exon arrays were used to analyze FUS-mediated transcription and alternative splicing in primary cortical neurons.
• High-throughput sequencing of RNA isolated by crosslinking immunoprecipitation (HITS-CLIP) identified FUS-binding sites in the mouse cerebrum.

Main Results:

• FUS-binding sites exhibit stable secondary structures.
• FUS binds near alternatively spliced exons, including those in Mapt, Camk2a, and Fmr1, genes associated with neurodegeneration.
• FUS binding to promoter antisense strands downregulates coding strand transcription, indicating position-dependent regulation.

Conclusions:

• FUS plays a critical role in regulating gene transcription and alternative splicing in a position-dependent manner.
• Understanding FUS binding mechanisms provides insights into neurodegenerative disease pathogenesis.