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Nitric oxide drives proteomic diversity through alternative splicing

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE286557 | GEO | 2026/05/21

REPOSITORIES: GEO

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Nitric oxide drives proteomic diversity through alternative splicing [CLIP-Seq]

Project description:Redox signaling by nitric oxide (NO) is estimated to control the large part of the global proteome via S-nitrosylation (SNO-modification). Here we report that RNA-binding proteins (RBPs) represent the most significantly enriched class of S-nitrosylation targets, with broad coverage of spliceosomal factors. We demonstrate that NO regulates alternative splicing (AS) and that S-nitrosylation of PTBP1, a central regulator of AS, can massively shift and contextually alter gene expression, while further enriching the transcriptome for SNO sites. PTBP1 S-nitrosylation changes RNA-binding domain conformation, RNA motif recognition, protein–RNA and protein–protein interactions, and intracellular trafficking to impact pathways for viral infection and neurodegeneration. Levels of SNO-PTBP1 are reduced in mouse and human Alzheimer’s brains and correlate with adverse clinical outcomes. Overall, SNO-RBPs are characterized by conservation across diverse lineages and SNO sites and provide a blueprint for redox regulation of both transcriptome and proteome in physiology and disease.

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