SP3 (Specificity Protein 3) is a transcription factor belonging to the SP/KLF family of zinc finger proteins. SP3 regulates the expression of numerous genes involved in cell proliferation, differentiation, and neuronal function. It has been implicated in Alzheimer's disease, Parkinson's disease, and various neurological disorders.
| Symbol | SP3 |
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| Full Name | Specificity Protein 3 |
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| Chromosomal Location | 2q31.1 |
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| NCBI Gene ID | [6671](https://www.ncbi.nlm.nih.gov/gene/6671) |
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| OMIM | [604411](https://www.omim.org/entry/604411) |
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| Ensembl ID | ENSG00000172845 |
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| UniProt ID | [Q02067](https://www.uniprot.org/uniprot/Q02067) |
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| Associated Diseases | [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Cancer](/diseases/cancer) |
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SP3 is a sequence-specific transcription factor that binds to GC-rich promoter elements (GC boxes) and regulates gene expression. It plays crucial roles in both normal development and disease processes.
- Transactivation Domains: N-terminal regions required for transcriptional activation
- Zinc Finger Domain: C-terminal DNA-binding domain with three C2H2-type zinc fingers
- Repressor Domain: Contains domains that can recruit co-repressors
- Gene Regulation: Binds to GC box sequences (GGGGCGGGG) in target gene promoters
- Cell Proliferation: Regulates genes involved in cell cycle control (e.g., cyclin D1)
- Neuronal Differentiation: Controls expression of neuronal genes during development
- Synaptic Plasticity: Regulates genes important for synaptic function
- Apoptosis: Can function as both pro- and anti-apoptotic regulator
- Amyloid Regulation: SP3 regulates APP (Amyloid Precursor Protein) expression
- Tau Pathology: Involved in regulation of tau-associated genes
- Neuroinflammation: Controls inflammatory gene expression in microglia
- Reference: Suh et al., J. Biol. Chem. (2013)
- Cerebral Cortex: High expression in pyramidal neurons
- Hippocampus: Expressed in all CA regions and dentate gyrus
- Cerebellum: Present in Purkinje cells and granule cells
- Substantia Nigra: Detected in dopaminergic neurons
- Developmental Expression: High during embryonic brain development
- Nuclear: Predominantly nuclear transcription factor
- Tissue-Specific: Expression varies across brain regions
| Variant |
Function |
Disease Association |
| rs3733759 |
Promoter polymorphism |
Possible PD risk |
| rs2718058 |
5'UTR variant |
None confirmed |
| IVS1+1G>A |
Splicing variant |
Rare, uncertain |
- SP3 modulators are being investigated for neurodegenerative diseases
- Gene therapy approaches targeting SP3 expression in development
- Reference: Biggs et al., CNS Drugs (2012)
- SP3 expression changes may reflect disease progression
- Under investigation as potential biomarker