ARID1A (AT-Rich Interactive Domain-Containing Protein 1A), also known as BAF250a, is a core subunit of the SWI/SNF (BAF) chromatin remodeling complex. This ATP-dependent complex regulates gene expression by altering chromatin accessibility, thereby influencing neuronal development, synaptic plasticity, and cognitive function.
| ARID1A Protein |
|---|
| Protein Name | AT-rich interactive domain-containing protein 1A / BAF250a |
| Gene | [ARID1A](/genes/arid1a) |
| UniProt ID | [O14497](https://www.uniprot.org/uniprot/O14497) |
| PDB Structures | 5dkd, 5dj5 |
| Molecular Weight | 242 kDa |
| Subcellular Localization | Nucleus, chromatin |
| Protein Family | SWI/SNF family, BAF250/ARID1 |
¶ Domain Architecture
ARID1A contains multiple functional domains:
- ARID domain: AT-rich interactive DNA-binding domain
- BAF250 domain: Mediates protein-protein interactions within the BAF complex
- LxxLL motifs: Nuclear receptor interaction motifs
- Polyglutamine stretches: Variable length Gln repeats
- SWI/SNF Complex: Core subunit of the BAF chromatin remodeling complex
- Gene Expression Regulation: Controls accessibility of transcriptional machinery to DNA
- Histone Modification: Facilitates nucleosome sliding and eviction
- Essential for neurogenesis and neuronal differentiation
- Regulates synaptic plasticity-related gene expression
- Controls memory formation and cognitive function
- Maintains neuronal identity
- Participates in activity-dependent gene transcription
- Links neuronal activity to chromatin changes
- Regulates DNA methylation patterns
- Altered SWI/SNF complex function in AD brain
- Dysregulated chromatin remodeling in neuronal degeneration
- Epigenetic alterations in AD-related genes
- Potential therapeutic target for cognitive enhancement
- SWI/SNF alterations in dopaminergic neurons
- May affect alpha-synuclein transcription regulation
- Role in mitochondrial function gene regulation
¶ Intellectual Disability and Autism
- ARID1A mutations cause Coffin-Siris syndrome
- Haploinsufficiency leads to neurodevelopmental phenotypes
- Impaired synaptic plasticity gene regulation
¶ ALS and Frontotemporal Dementia
- Altered chromatin remodeling in motor neurons
- May affect C9orf72 and other ALS gene regulation
- Potential role in TDP-43 pathology
- SWI/SNF dysfunction in HD
- Altered transcriptional regulation of disease modifiers
- HDAC inhibitors being explored for neurodegeneration
- BRD4 and bromodomain inhibitors
- Small molecule SWI/SNF modulators in development
- Viral vector delivery for loss-of-function mutations
- CRISPR-based epigenetic editing
- Induced neurons from patient iPSCs
- Conditional knockout mouse models
- Wu et al., ARID1A structure and function (2017)
- Kadoch et al., BAF complex in disease (2016)
- VanderHeijden et al., ARID1A in cancer (2015)
- Santen et al., SWI/SNF and neural development (2012)