TIA1 cytotoxic granule associated RNA binding protein (TIA1)

TIA1 cytotoxic granule associated RNA binding protein (TIA1) is an RNA-binding protein that plays essential roles in regulating alternative splicing, mRNA translation, and cellular responses to stress[2][3][4][5][1]. It belongs to the RNA recognition motif (RRM) family and features a C-terminal glutamine-rich prion-related domain (PRD), which enables TIA1 to promote the reversible aggregation of stalled translation initiation complexes into stress granules under environmental or metabolic stress conditions[1][6]. TIA1 acts within the nucleus to regulate alternative splicing and can shuttle to the cytoplasm to orchestrate the nucleation and assembly of stress granules, transient structures that mediate protein and RNA triage during stress responses. Mutations in TIA1 are linked to neurodegenerative diseases such as amyotrophic lateral sclerosis (ALS), frontotemporal dementia (FTD), and Welander distal myopathy, and are implicated in Alzheimer’s disease pathophysiology through toxic protein aggregation[2][6][5]. TIA1 does not currently have clinically validated direct drug modulators, but its role in stress granule dynamics and RNA metabolism makes it a target of interest in the context of neurodegeneration and certain cancers.

Other names

Cytotoxic granule associated RNA binding protein TIA1TIA1TIA-1RNA-binding protein TIA-1T-cell-restricted intracellular antigen-1Nucleolysin TIA-1 isoform p40p40-TIA-1ALS26WDMp15-TIA-1

Modulation of RNA metabolism (by binding U-rich sequences); Induction or suppression of stress granule formation through prion-like domain aggregation; Regulation of gene expression by controlling alternative splicing and translation