The ARID1B Antibody is a critical reagent for modern life science research, especially in the fields of chromatin remodeling, gene regulation, and epigenetic control of transcriptional networks.
Researchers studying transcriptional complexes, BAF subunit assembly, or SWI/SNF-dependent regulation frequently rely on ARID1B antibodies for precise detection, localization, and functional mapping of the ARID1B protein within mammalian systems.
ARID1B (AT-rich interactive domain-containing protein 1B) is a large nuclear protein encoded by the ARID1B gene on human chromosome 6q25.3, belonging to the ARID (AT-rich interaction domain) family of DNA-binding proteins. It functions as a core subunit of the SWI/SNF (Switch/Sucrose Non-Fermentable) chromatin remodeling complex, essential for altering nucleosome structure and enabling access of transcription factors to promoter and enhancer regions.
Extensive studies from NCBI Gene Database, NCBI Protein Resource, and National Library of Medicine confirm that ARID1B is ubiquitously expressed but enriched in neural, embryonic, and reproductive tissues, highlighting its importance in cell lineage specification and developmental gene expression.
Structural Biology and Domain Organization
The ARID1B protein contains several conserved regions including:
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An ARID DNA-binding domain, which recognizes AT-rich motifs in promoter sequences.
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LXXLL motifs and coiled-coil domains that facilitate interaction with transcriptional co-regulators.
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A C-terminal region responsible for protein-protein interactions within the SWI/SNF complex.
This modular architecture allows ARID1B to integrate DNA recognition with chromatin remodeling activity, influencing gene expression patterns during cell differentiation and tissue development (Protein Data Bank, UniProt Knowledgebase).
The protein’s tertiary structure suggests high conformational flexibility, enabling dynamic participation in multiple complexes with BRG1 (SMARCA4) and BAF155 (SMARCC1), key ATP-dependent remodelers (Harvard Structural Biology Department).
Role of ARID1B in Chromatin Remodeling and Transcription Regulation
Within the BAF complex, ARID1B determines DNA binding specificity and recruitment of additional cofactors that regulate histone modification patterns.
Studies available from PubMed Central and Broad Institute Publications demonstrate that ARID1B interacts with transcription factors such as REST, SOX2, and OCT4, linking it to pluripotency and neuronal identity regulation.
Through its interaction with histone acetyltransferases, ARID1B promotes open chromatin configurations and facilitates RNA polymerase II access to target gene promoters. This mechanism is crucial for transcriptional activation during embryogenesis and tissue-specific differentiation (National Center for Biotechnology Information, EMBL-EBI).
Applications of ARID1B Antibody in Experimental Biology
The ARID1B Antibody serves as a versatile detection reagent across several experimental workflows, making it an indispensable component in molecular biology laboratories.
Western Blotting (WB)
ARID1B antibodies enable sensitive detection of endogenous and overexpressed ARID1B in cell lysates or tissue extracts.
The typical molecular weight observed ranges between 220–250 kDa depending on isoform composition. Researchers often use lysates from HEK293, HeLa, or SH-SY5Y cells for control validation (NIH Protein Expression Resource).
Immunohistochemistry (IHC) and Immunocytochemistry (ICC)
In fixed tissue sections, ARID1B antibodies localize primarily to the nuclear compartment. Signal amplification methods such as DAB staining or fluorescent secondary antibodies (Alexa Fluor 488/594) enhance visualization. Optimal fixation involves 4% paraformaldehyde with heat-mediated antigen retrieval in citrate buffer pH 6.0 (Yale Histology Core Facility).
Chromatin Immunoprecipitation (ChIP)
ARID1B antibodies are powerful tools in ChIP-seq assays to map genome-wide occupancy of the BAF complex. Enrichment analysis identifies promoter regions associated with neural development and transcriptional activation (ENCODE Project Data Portal).
Immunoprecipitation (IP) and Mass Spectrometry
Validated antibodies against ARID1B allow the pull-down of BAF complexes followed by LC-MS/MS proteomic profiling, confirming interaction with SMARCE1, DPF2, and BRD9 (Proteome Exchange Consortium).
Epigenetic and Transcriptional Network Studies
ARID1B is deeply integrated in epigenetic reprogramming pathways. Research supported by National Human Genome Research Institute and European Bioinformatics Institute highlights its involvement in:
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Nucleosome repositioning near transcriptional start sites.
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Remodeling of enhancer regions responsive to developmental cues.
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Regulation of H3K27ac and H3K4me3 histone marks, often associated with active chromatin.
Knockdown or knockout studies using CRISPR/Cas9 systems indicate that loss of ARID1B results in widespread transcriptional repression and altered enhancer activity, impacting neural gene networks (Addgene CRISPR Resource, Cold Spring Harbor Laboratory).
Expression Patterns and Tissue Specificity
Transcriptomic analyses from the Human Protein Atlas and GTEx Portal demonstrate that ARID1B mRNA is highly expressed in:
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Cerebral cortex and hippocampus, linked to synaptic plasticity.
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Heart and skeletal muscle, involved in contractile gene expression.
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Embryonic tissues, where it regulates morphogen gradients and differentiation.
Protein localization studies using confocal microscopy confirm its predominant nuclear presence with a speckled distribution, co-localizing with transcriptionally active chromatin regions (NIH Cell Image Library).
Antibody Validation and Quality Control
For reproducible and reliable data, every batch of ARID1B Antibody should undergo:
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Validation by Western blot with known positive controls.
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Peptide competition assays to verify specificity.
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Confirmation in knockdown or knockout cell lines as negative controls.
The validation protocols follow standards established by the Research Resource Identification Initiative (RRID) and NIH Antibody Registry.
High-quality antibodies such as AffiAB® Anti-ARID1B Antibody ensure consistency across multiple applications, enhancing confidence in experimental reproducibility.
Integration into Multi-Omic and Systems Biology Platforms
Modern systems biology approaches combine ChIP-seq, ATAC-seq, and RNA-seq datasets to define the role of ARID1B in transcriptional control networks.
ARID1B Antibody-based immunoprecipitation aids in identifying cis-regulatory modules, enhancer clusters, and super-enhancer structures that dictate lineage-specific expression programs (National Center for Biotechnology Information GEO Datasets).
Cross-comparison of ARID1B occupancy with epigenomic marks allows the construction of 3D chromatin interaction maps using Hi-C and Cut&Tag technologies (NCBI SRA, UCSC Genome Browser).
Technical Handling and Storage Conditions
For long-term stability and optimal reactivity:
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Store the antibody at −20 °C to −80 °C, protected from light and repeated freeze–thaw cycles.
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For working aliquots, maintain at 4 °C for up to two weeks.
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Dilution factors vary depending on application:
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WB: 1 : 500 – 1 : 2000
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IHC/ICC: 1 : 100 – 1 : 500
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ChIP/IP: 1 – 2 µg per reaction
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Technical references for handling guidelines are available from NIH Image Resource (IDR) and University of Cambridge Antibody Guidelines.
Product Integration for Research Platforms
The AffiAB® Anti-ARID1B Antibody fits seamlessly into research frameworks focusing on:
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Chromatin dynamics
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Transcriptional co-regulation
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Epigenomic mapping
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Stem cell differentiation assays
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Protein complex assembly studies
Combining this antibody with reagents for histone modification, DNA methylation, and transcription factor binding studies provides a comprehensive understanding of epigenetic landscapes (European Molecular Biology Organization).Data Resources and Literature Support
For deeper reference and dataset exploration:
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NCBI Gene Expression Omnibus (GEO) – ARID1B-associated transcriptome datasets.
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NIH RePORTER – Ongoing funded projects involving ARID1B.
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PubChem – Related molecular interactors.
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Open Targets Platform – Functional genomics insights.
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USDA Research Portal – Cross-species comparative studies.
These open databases provide invaluable material for cross-referencing ARID1B-related data in gene ontology, pathway enrichment, and protein interaction analyses.
Conclusion
The ARID1B Antibody stands as a highly specialized reagent for researchers investigating chromatin accessibility, nucleosome remodeling, and gene regulatory networks. Its robust performance in immunoassays, epigenomic profiling, and proteomics workflows ensures reliable detection of ARID1B within complex biological systems.
With rigorous validation, strong literature support, and compatibility across a range of experimental techniques, the AffiAB® Anti-ARID1B Antibody enables scientists to expand understanding of the molecular architecture of chromatin and the mechanisms of transcriptional regulation in multicellular organisms.
This reagent continues to be a key element in advancing molecular biology, genomics, and epigenetic research, contributing to the broader understanding of how chromatin remodeling complexes influence cellular identity and developmental processes.