Tissue-specific alternative splicing remodels protein-protein interaction networks.

Area of Science:

• Molecular Biology
• Proteomics
• Genomics

Background:

• Alternative splicing is crucial for proteomic complexity, but the functions of most differentially spliced exons remain unknown.
• Tissue-regulated exons are often found in flexible protein regions involved in interactions.

Purpose of the Study:

• To investigate the functional role of tissue-regulated alternative exons in protein-protein interactions (PPIs).
• To determine how alternative splicing influences the formation of tissue-specific protein interaction networks.

Main Methods:

• Analysis of exon location within protein structures and enrichment in interaction regions.
• Utilized LUMIER, an automated assay, to assess the impact of neural-regulated exons on PPIs.
• Investigated specific exon functions, including a neural-specific exon's role in endocytosis.

Main Results:

• Neural and tissue-regulated exons are enriched in flexible protein regions mediating interactions.
• Approximately one-third of neural-regulated exons analyzed were found to modulate PPIs.
• Inclusion of specific exons could either stimulate or repress protein interactions.

Conclusions:

• Regulated alternative exons frequently remodel protein interactions, establishing tissue-dependent PPI networks.
• Identified a neural-specific exon critical for the Bridging Integrator 1 (Bin1)/Amphiphysin II and Dynamin 2 (Dnm2) interaction, facilitating endocytosis.