¶ NONO Protein — Non-POU Domain Containing Octamer Binding
Nono Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
NONO (Non-PO[U] Domain Containing Octamer Binding) is a nuclear RNA-binding protein that plays essential roles in RNA processing, transcriptional regulation, and circadian rhythm control. It belongs to the Drosophila Behavior Human Splicing (DBHS) family and is implicated in several neurodegenerative diseases.
| NONO Protein |
|---|
| Protein Name | Non-POU Domain Containing Octamer Binding |
| Gene | NONO |
| UniProt ID | Q13435 |
| PDB ID | 4RUM, 5O5B |
| Molecular Weight | 54 kDa |
| Subcellular Localization | Nucleus (speckles, paraspeckles) |
| Protein Family | DBHS family |
NONO contains two RNA recognition motifs (RRMs) in the central region and a coiled-coil domain for dimerization at the C-terminus. The protein forms heterodimers with other DBHS family members:
- SFPQ (Splicing Factor Proline-Glutamine Rich)
- PSPC1 (Paraspeckle Component 1)
These heterodimers are the functional units involved in RNA processing.
NONO participates in multiple nuclear processes:
- Alternative splicing: Regulates splice site selection for neuronal-specific exons
- RNA stability: Binds to specific mRNAs to regulate stability and decay
- Transcription: Acts as transcriptional co-activator with nuclear receptors
- NONO interacts with CRY1/2 and PER1/2 proteins
- Regulates circadian gene expression in the suprachiasmatic nucleus
- Essential for proper circadian clock function
- Localizes to DNA damage foci
- Participates in transcription-coupled DNA repair
- Regulates p53 activity in response to genotoxic stress
Mutations in NONO are linked to ALS and frontotemporal dementia (FTD):
- G400W mutation: Impairs RNA binding and splicing function
- D262G mutation: Disrupts nuclear localization
- NONO mutations lead to mis-splicing of neuronal genes essential for motor neuron survival
- NONO is upregulated in AD brains
- Regulates BACE1 (β-secretase) alternative splicing
- Contributes to amyloid precursor protein processing
- Altered NONO expression in PD substantia nigra
- Affects mitochondrial function through altered splicing
- Linked to circadian dysfunction in PD patients
- RNA splicing modulators: Small molecules that restore proper NONO function
- Gene therapy: Deliver wild-type NONO to affected neurons
- Antisense oligonucleotides: Correct pathological splicing events
Nono Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
The study of Nono Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Thomas CA, Tejwani V, Trujillo CA, et al. Modeling ALS with NONO mutations reveals defects in RNA processing (2016)
- Kowalska M, Bartoszewska H, Szewczyk L, et al. NONO regulates circadian rhythm and metabolism (2016)
- Zhang T, Wu M, Rao G, et al. NONO promotes DNA damage repair in neurons (2017)
- Shen W, Liang XH, Sun H, et al. NONO alternative splicing in Alzheimer's disease (2019)
- D'Ambrogio A, Nakaya N, Tazi J. NONO and paraspeckles in disease (2018)