Systematic analysis of alternative exon-dependent interactome remodeling reveals multitasking functions of gene regulatory factors.
Mol Cell
; 83(23): 4222-4238.e10, 2023 Dec 07.
Article
em En
| MEDLINE
| ID: mdl-38065061
ABSTRACT
Alternative splicing significantly expands biological complexity, particularly in the vertebrate nervous system. Increasing evidence indicates that developmental and tissue-dependent alternative exons often control protein-protein interactions; yet, only a minor fraction of these events have been characterized. Using affinity purification-mass spectrometry (AP-MS), we show that approximately 60% of analyzed neural-differential exons in proteins previously implicated in transcriptional regulation result in the gain or loss of interaction partners, which in some cases form unexpected links with coupled processes. Notably, a neural exon in Chtop regulates its interaction with the Prmt1 methyltransferase and DExD-Box helicases Ddx39b/a, affecting its methylation and activity in promoting RNA export. Additionally, a neural exon in Sap30bp affects interactions with RNA processing factors, modulating a critical function of Sap30bp in promoting the splicing of <100 nt "mini-introns" that control nuclear RNA levels. AP-MS is thus a powerful approach for elucidating the multifaceted functions of proteins imparted by context-dependent alternative exons.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Splicing de RNA
/
Processamento Alternativo
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article