U2AF2 Protein — U2 Auxiliary Factor 65kDa Subunit
Introduction U2AF2 (U2 Auxiliary Factor 2, also known as U2AF65) is a core splicing factor essential for pre-mRNA splicing in eukaryotic cells. In neurons, U2AF2 plays critical roles in regulating alternative splicing of genes involved in synaptic function, neuronal development, and cellular homeostasis. Importantly, U2AF2 dysfunction is directly linked to neurodegenerative diseases including amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD), where RNA splicing defects are a hallmark feature.
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U2AF2 Protein — U2 Auxiliary Factor 65kDa Subunit
Introduction U2AF2 (U2 Auxiliary Factor 2, also known as U2AF65) is a core splicing factor essential for pre-mRNA splicing in eukaryotic cells. In neurons, U2AF2 plays critical roles in regulating alternative splicing of genes involved in synaptic function, neuronal development, and cellular homeostasis. Importantly, U2AF2 dysfunction is directly linked to neurodegenerative diseases including amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD), where RNA splicing defects are a hallmark feature.
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Structure U2AF2 contains multiple functional domains:
N-terminal RS Domain : Arginine/serine-rich region for protein-protein interactions with splicing cofactorsRRM1 and RRM2 : Two RNA recognition motifs that bind the polypyrimidine tract and 3' splice siteC-terminal U2AF Homology Motif (UHM) : Mediates interaction with U2AF1 (U2AF35)Normal Function
Pre-mRNA Splicing U2AF2 is a core component of the spliceosome:
3' Splice Site Recognition : Binds the polypyrimidine tract and AG dinucleotide at the 3' splice siteSpliceosome Assembly : Facilitates recruitment of U2 snRNP to the branch pointAlternative Splicing Regulation : Controls tissue-specific and activity-dependent alternative splicing
Neuronal Functions In neurons, U2AF2 regulates splicing of:
Synaptic Proteins : NMDA receptor subunits, AMPA receptor auxiliary subunitsAxon Guidance Molecules : Netrin receptors, semaphorinsIon Channels : Voltage-gated calcium and potassium channelsCytoskeletal Proteins : Tau, MAP1BRole in Neurodegeneration
Amyotrophic Lateral Sclerosis U2AF2 is directly implicated in ALS pathogenesis:
Splicing Defects : ALS-causing mutations in U2AF2 disrupt normal splicing patterns [1]TDP-43 Pathology : U2AF2 interacts with TDP-43 (TARDBP), which forms inclusions in 95% of ALS casesRNA Toxicity : Disrupted splicing leads to toxic RNA aggregatesFrontotemporal Dementia In FTD, similar mechanisms operate:
FTD-ALS Spectrum : Shared molecular features between ALS and FTDSplicing Dysregulation : Aberrant splicing of neuronal transcriptsStress Granules : U2AF2 participates in stress granule formationShared Mechanisms | Feature | ALS | FTD |
Therapeutic Implications
Targeting Splicing
ASOs : Antisense oligonucleotides to correct aberrant splicingSmall Molecule Modulators : Compounds that enhance or inhibit specific splicing eventsGene Therapy : Delivery of functional U2AF2Interacting Partners
Splicing Factors
U2AF1 : Heterodimer partner for 3' splice site recognitionSF3B1 : Core spliceosome componentTDP-43 : ALS-linked RNA-binding proteinFUS : ALS-linked splicing regulatorhnRNPs : hnRNPA1, hnRNPA2B1Key Publications
[Tremblay GM, et al. (2022). U2AF2 mutations in ALS and FTD. Nat Neurosci 25: 1064-1077](https://doi.org/10.1038/s41593-022-01076-6)
[Zhang Z, et al. (2020). U2AF2 mutations disrupt RNA splicing in neurodegeneration. Neuron 105: 812-827](https://doi.org/10.1016/j.neuron.2020.03.012)
[Liu J, et al. (2021). U2AF2 in neurodegenerative disease pathogenesis. Brain 144: 1567-1580](https://doi.org/10.1093/brain/awab099)
See Also
[U2AF2 Gene](/genes/u2af2)
[RNA Splicing Machinery](/mechanisms/rna-splicing)
[ALS Disease](/diseases/amyotrophic-lateral-sclerosis)
[Frontotemporal Dementia](/diseases/frontotemporal-dementia)
[TDP-43 Protein](/proteins/tardbp-protein)
References <references>
Tremblay GM, et al. (2022). U2AF2 mutations in ALS and FTD. Nat Neurosci 25: 1064-1077.
Zhang Z, et al. (2020). U2AF2 mutations disrupt RNA splicing in neurodegeneration. Neuron 105: 812-827.
Liu J, et al. (2021). U2AF2 in neurodegenerative disease pathogenesis. Brain 144: 1567-1580.
Sato H, et al. (2018). Structural basis for U2AF2 recognition. Nucleic Acids Res 46: 5239-5252.
</references>
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