GO:0071565 nBAF complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0071565 defines the nBAF complex, a neuron-specific SWI/SNF-type chromatin remodeling complex found in post-mitotic neurons.
• The nBAF complex contains actin and subunits encoded by ARID1A/BAF250A or ARID1B/BAF250B, SMARCD1/BAF60A, SMARCD3/BAF60C, SMARCA2/BRM/BAF190B, SMARCA4/BRG1/BAF190A, SMARCB1/BAF47, SMARCC1/BAF155, SMARCE1/BAF57, SMARCC2/BAF170, DPF1/BAF45B, DPF3/BAF45C, and ACTL6B/BAF53B.
• nBAF, together with CREST, regulates genes essential for dendrite growth.
• Activity-assembled nBAF mediates rapid immediate early gene transcription by regulating RNA polymerase II productive elongation.
• Mutations in ACTL6B cause early onset severe developmental and epileptic encephalopathy with brain hypomyelination and cerebellar atrophy.
• The nBAF subunit CREST/SS18L1 regulates hippocampal memory processes via tyrosine 397 and histone acetyltransferase CBP.
Description
The nBAF complex (GO:0071565) is a neuron-specific SWI/SNF-type chromatin remodeling complex that is found in post-mitotic neurons. It is defined by the presence of actin and a specific set of subunits, including ARID1A/BAF250A or ARID1B/BAF250B, SMARCD1/BAF60A, SMARCD3/BAF60C, SMARCA2/BRM/BAF190B, SMARCA4/BRG1/BAF190A, SMARCB1/BAF47, SMARCC1/BAF155, SMARCE1/BAF57, SMARCC2/BAF170, DPF1/BAF45B, DPF3/BAF45C, and ACTL6B/BAF53B. This complex, along with CREST, plays a critical role in regulating the activity of genes essential for dendrite growth. Researchers study the nBAF complex to understand how chromatin remodeling controls neuronal development, synaptic plasticity, and immediate early gene transcription.
nBAF complex At A Glance
| GO ID | GO:0071565 |
|---|---|
| GO term | nBAF complex |
| Ontology | cellular_component |
| Synonym | none |
| Major function | Neuron-specific SWI/SNF-type chromatin remodeling complex that regulates genes essential for dendrite growth and immediate early gene transcription |
| Subunit composition | Actin and proteins encoded by ARID1A/BAF250A or ARID1B/BAF250B, SMARCD1/BAF60A, SMARCD3/BAF60C, SMARCA2/BRM/BAF190B, SMARCA4/BRG1/BAF190A, SMARCB1/BAF47, SMARCC1/BAF155, SMARCE1/BAF57, SMARCC2/BAF170, DPF1/BAF45B, DPF3/BAF45C, ACTL6B/BAF53B |
| Tissue specificity | Post-mitotic neurons |
| Associated disease | Developmental and epileptic encephalopathy, brain hypomyelination, cerebellar atrophy, autism spectrum disorder |
What Is GO:0071565?
The nBAF complex is a SWI/SNF-type chromatin remodeling complex that is specifically found in post-mitotic neurons. In humans, it contains actin and proteins encoded by the ARID1A/BAF250A or ARID1B/BAF250B, SMARCD1/BAF60A, SMARCD3/BAF60C, SMARCA2/BRM/BAF190B, SMARCA4/BRG1/BAF190A, SMARCB1/BAF47, SMARCC1/BAF155, SMARCE1/BAF57, SMARCC2/BAF170, DPF1/BAF45B, DPF3/BAF45C, and ACTL6B/BAF53B genes. The nBAF complex, together with CREST, regulates the activity of genes essential for dendrite growth.
Why Is nBAF complex Important in Cell Biology?
The nBAF complex is important because it provides a neuron-specific chromatin remodeling mechanism that controls gene expression programs essential for neuronal development, dendrite growth, and synaptic function. Disruption of nBAF subunits is linked to severe neurodevelopmental disorders, including developmental and epileptic encephalopathy, brain hypomyelination, cerebellar atrophy, and autism spectrum disorder. Additionally, the nBAF complex mediates rapid immediate early gene transcription by regulating RNA polymerase II productive elongation, which is critical for neuronal activity-dependent responses. Understanding nBAF function therefore has broad implications for neurobiology, disease modeling, and therapeutic development.
• Regulates genes essential for dendrite growth in post-mitotic neurons.
• Mediates rapid immediate early gene transcription by regulating RNA polymerase II productive elongation.
• Mutations in ACTL6B cause early onset severe developmental and epileptic encephalopathy with brain hypomyelination and cerebellar atrophy.
• The nBAF subunit CREST/SS18L1 regulates hippocampal memory processes via tyrosine 397 and histone acetyltransferase CBP.
• Baf53b (ACTL6B) has been implicated in autism spectrum disorder.
• The BAF complex, including nBAF, is critical in development and disease.
• nBAF is part of the neural-specific chromatin landscape created by npBAF and nBAF complexes.
• GBAF, a small BAF sub-complex, has systematic implications for BAF biology.
• nBAF serves as a model for studying activity-dependent chromatin remodeling in neurons.
• nBAF subunits are potential targets for neurological and psychiatric disease research.
What Happens During nBAF complex?
Activity-dependent assembly
In simple terms: When neurons are active, the nBAF complex is assembled to help turn on genes quickly.
The nBAF complex is activity-assembled and mediates rapid immediate early gene transcription by regulating RNA polymerase II productive elongation. This assembly allows neurons to respond to stimuli by rapidly inducing gene expression programs.
Chromatin remodeling and gene regulation
In simple terms: nBAF changes how DNA is packaged to control which genes are turned on or off.
As a SWI/SNF-type chromatin remodeling complex, nBAF regulates the activity of genes essential for dendrite growth. It creates a neural-specific chromatin landscape that is distinct from other BAF complexes.
Role in dendrite growth
In simple terms: nBAF helps neurons grow their branching structures called dendrites.
The nBAF complex, along with CREST, plays a role regulating the activity of genes essential for dendrite growth. This function is critical for proper neuronal connectivity and brain development.
Immediate early gene transcription
In simple terms: nBAF helps turn on immediate early genes that are important for learning and memory.
Activity-assembled nBAF complex mediates rapid immediate early gene transcription by regulating RNA polymerase II productive elongation. This process is essential for neuronal plasticity and memory formation.
Key Genes Involved in GO:0071565 nBAF complex
The nBAF complex is composed of multiple subunits, each encoded by a specific gene that contributes to its structure and function.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ARID1A | Subunit BAF250A; DNA-binding and chromatin targeting | Frequently mutated in cancers; studied for nBAF assembly |
| ARID1B | Subunit BAF250B; alternative to ARID1A | Implicated in neurodevelopmental disorders |
| SMARCD1 | Subunit BAF60A; core component | Part of nBAF complex; role in neuronal gene regulation |
| SMARCD3 | Subunit BAF60C; core component | Neuron-specific subunit; involved in nBAF function |
| SMARCA2 | Subunit BRM/BAF190B; ATPase catalytic subunit | Mutations linked to Nicolaides-Baraitser syndrome |
| SMARCA4 | Subunit BRG1/BAF190A; ATPase catalytic subunit | Critical for chromatin remodeling; mutated in cancers |
| SMARCB1 | Subunit BAF47; core component | Tumor suppressor; mutated in malignant rhabdoid tumors |
| SMARCC1 | Subunit BAF155; scaffold protein | Essential for complex integrity |
| SMARCE1 | Subunit BAF57; DNA-binding subunit | Involved in chromatin targeting |
| SMARCC2 | Subunit BAF170; scaffold protein | Required for nBAF assembly |
| DPF1 | Subunit BAF45B; PHD finger protein | Neuron-specific subunit; potential role in neurodevelopment |
| DPF3 | Subunit BAF45C; PHD finger protein | Neuron-specific subunit; associated with nBAF |
| ACTL6B | Subunit BAF53B; actin-related protein | Mutations cause developmental and epileptic encephalopathy |
| ACTB | Actin; structural component | Required for nBAF complex function |
| CREST | SS18L1; co-regulator with nBAF | Regulates hippocampal memory via tyrosine 397 and CBP |
| SS18L1 | CREST; nBAF-associated protein | Involved in memory processes |
| GBAF | Small BAF sub-complex | Implications for BAF biology |
How Is nBAF complex Regulated?
The nBAF complex is regulated by neuronal activity, which triggers its assembly and enables rapid immediate early gene transcription through regulation of RNA polymerase II productive elongation. Additionally, the nBAF subunit CREST/SS18L1 regulates hippocampal memory processes via tyrosine 397 and histone acetyltransferase CBP. The BAF complex, including nBAF, is also regulated during development and in disease states.
nBAF complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ACTL6B | Developmental and epileptic encephalopathy with brain hypomyelination and cerebellar atrophy | Knockout or point-mutation knock-in in neuronal cell lines or animal models |
| ACTL6B | Autism spectrum disorder | Overexpression or knockout in neuronal cultures |
| CREST/SS18L1 | Hippocampal memory processes | Knock-in of tyrosine 397 mutants in hippocampal neurons |
| ARID1A | Cancer | Knockout in cancer cell lines |
| SMARCB1 | Malignant rhabdoid tumors | Knockout in rhabdoid tumor cell lines |
Developmental and epileptic encephalopathy
Mutations in ACTL6B, which encodes the nBAF subunit BAF53B, cause early onset severe developmental and epileptic encephalopathy with brain hypomyelination and cerebellar atrophy. This highlights the critical role of nBAF in brain development and function.
Autism spectrum disorder
Baf53b (ACTL6B) has been implicated in autism spectrum disorder, suggesting that nBAF dysfunction may contribute to neurodevelopmental disorders. Insights into the emerging role of Baf53b in autism spectrum disorder are being actively investigated.
Memory and cognitive disorders
The nBAF complex subunit CREST/SS18L1 regulates hippocampal memory processes via tyrosine 397 and histone acetyltransferase CBP. Dysregulation of this pathway may contribute to memory-related disorders.
Cancer
The BAF complex, including nBAF subunits such as ARID1A, SMARCA4, and SMARCB1, is frequently mutated in various cancers. Understanding nBAF-specific roles may provide insights into cancer biology.
From nBAF complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of nBAF subunit affect dendrite growth? | Knockout of ACTL6B or DPF1 in primary neurons |
| Does a specific point mutation in CREST affect memory? | Point-mutation knock-in of CREST Y397F in mice |
| Does overexpression of BAF53B rescue nBAF function? | Overexpression of ACTL6B in neuronal cell lines |
| How does nBAF assembly change with activity? | Tagged knock-in of SMARCA4 for live imaging |
| What genes are regulated by nBAF? | Knockout of SMARCC1 followed by RNA-seq |
| Can nBAF subunits be targeted for cancer therapy? | Knockout of ARID1A in cancer organoids |
How to Study the nBAF complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ChIP-seq | Genome-wide binding of nBAF subunits | Identify target genes and regulatory elements |
| RNA-seq | Transcriptional changes | Assess gene expression after nBAF perturbation |
| Proteomics | Protein composition and interactions | Define nBAF subunits and interactors |
| Live-cell imaging | Complex assembly and localization | Study activity-dependent nBAF dynamics |
| CRISPR knockout | Loss-of-function phenotypes | Determine essentiality of nBAF subunits |
| CRISPR knock-in | Tagged or mutant proteins | Track nBAF subunits or model patient mutations |
| Electrophysiology | Neuronal activity | Link nBAF function to synaptic transmission |
| Behavioral assays | Memory and learning | Assess CREST/nBAF role in hippocampal memory |
Chromatin immunoprecipitation sequencing (ChIP-seq)
ChIP-seq can map genome-wide binding sites of nBAF subunits such as SMARCA4 or ARID1A to identify target genes and regulatory regions.
RNA sequencing (RNA-seq)
RNA-seq measures changes in gene expression upon nBAF subunit knockout or knockdown, revealing pathways regulated by the complex.
Proteomics and immunoprecipitation
Immunoprecipitation coupled with mass spectrometry can identify nBAF complex components and their interactors, including CREST and actin.
Live-cell imaging
Fluorescent tagging of nBAF subunits allows visualization of complex assembly and dynamics in neurons.
How CRISPR Can Be Used to Study GO:0071565 nBAF complex
Knockout
CRISPR knockout of nBAF subunit genes such as ACTL6B, ARID1A, or SMARCA4 can reveal their essential roles in neuronal development and gene regulation. Knockout models are valuable for studying loss-of-function phenotypes associated with neurodevelopmental disorders.
Point Mutation
CRISPR point mutation can introduce specific patient-associated mutations, such as in ACTL6B or CREST/SS18L1, to model disease mechanisms and test therapeutic strategies.
Knock-in
CRISPR knock-in can be used to tag endogenous nBAF subunits with fluorescent or affinity tags, enabling live imaging and proteomic studies.
Overexpression
CRISPR overexpression of nBAF subunits, such as ACTL6B, can rescue loss-of-function phenotypes or study gain-of-function effects in neuronal cells.
How EDITGENE Supports nBAF complex Research
Researchers studying nBAF complex-related genes often need to determine whether a candidate gene is causally involved in neuronal development, disease, or chromatin regulation. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for nBAF complex research.
Frequently Asked Questions About nBAF complex
What is the nBAF complex?
The nBAF complex is a neuron-specific SWI/SNF-type chromatin remodeling complex found in post-mitotic neurons that regulates genes essential for dendrite growth and immediate early gene transcription.
What genes are involved in the nBAF complex?
Genes include ARID1A, ARID1B, SMARCD1, SMARCD3, SMARCA2, SMARCA4, SMARCB1, SMARCC1, SMARCE1, SMARCC2, DPF1, DPF3, and ACTL6B.
What is the function of GO:0071565?
GO:0071565 describes the nBAF complex, which functions in chromatin remodeling and regulation of genes essential for dendrite growth and neuronal activity-dependent transcription.
How is the nBAF complex regulated?
The nBAF complex is regulated by neuronal activity, which triggers its assembly and enables rapid immediate early gene transcription via RNA polymerase II elongation.
What diseases are associated with nBAF complex mutations?
Mutations in ACTL6B cause developmental and epileptic encephalopathy, and Baf53b has been implicated in autism spectrum disorder.
What is the role of CREST in the nBAF complex?
CREST/SS18L1 regulates hippocampal memory processes via tyrosine 397 and histone acetyltransferase CBP.
How can I study the nBAF complex in the lab?
Common methods include ChIP-seq, RNA-seq, proteomics, live-cell imaging, and CRISPR knockout or knock-in models.
What cell models are available for nBAF research?
EDITGENE provides knockout, point mutation, knock-in, and overexpression cell models for nBAF subunit genes.
Is the nBAF complex involved in cancer?
Yes, BAF complex subunits such as ARID1A and SMARCB1 are frequently mutated in cancers, and nBAF-specific roles are under investigation.
What is the difference between nBAF and other BAF complexes?
nBAF is neuron-specific and contains distinct subunits such as ACTL6B and DPF1/DPF3, whereas other BAF complexes are found in different cell types.
Conclusion
The nBAF complex (GO:0071565) is a critical neuron-specific chromatin remodeling complex that regulates gene expression programs essential for dendrite growth, immediate early gene transcription, and neuronal function. Its subunits are implicated in severe neurodevelopmental disorders, making it a key research focus. Understanding nBAF biology offers insights into neuronal development and disease, and EDITGENE provides the tools to accelerate this research.
References
- 1. Cornejo KG et al.. 2024. Activity-assembled nBAF complex mediates rapid immediate early gene transcription by regulating RNA polymerase II productive elongation.. Cell Rep 43(11):114877 PMID: 39412992
- 2. Cornejo KG et al.. 2023. Activity-assembled nBAF complex mediates rapid immediate early gene transcription by regulating RNA Polymerase II productive elongation.. bioRxiv PMID: 38234780
- 3. Alfert A et al.. 2019. The BAF complex in development and disease.. Epigenetics Chromatin 12(1):19 PMID: 30898143
- 4. Fichera M et al.. 2019. Mutations in ACTL6B, coding for a subunit of the neuron-specific chromatin remodeling complex nBAF, cause early onset severe developmental and epileptic encephalopathy with brain hypomyelination and cerebellar atrophy.. Hum Genet 138(2):187-198 PMID: 30656450
- 5. Rowland ME et al.. 2022. Insights Into the Emerging Role of Baf53b in Autism Spectrum Disorder.. Front Mol Neurosci 15:805158 PMID: 35185468
- 6. Garcia FG et al.. 2026. The nBAF complex subunit CREST/SS18L1 regulates hippocampal memory processes via tyrosine 397 and histone acetyltransferase CBP.. Cell Rep 45(4):117158 PMID: 41886450
- 7. Innis SM et al.. 2020. GBAF, a small BAF sub-complex with big implications: a systematic review.. Epigenetics Chromatin 13(1):48 PMID: 33143733
- 8. Staahl BT et al.. 2013. Creating a neural specific chromatin landscape by npBAF and nBAF complexes.. Curr Opin Neurobiol 23(6):903-13 PMID: 24090879
