GO:0042835 BRE binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0042835 BRE binding is a molecular function defined as binding to a BRE RNA element (Bruno response element).
• The term is distinct from protein-protein BRE interactions; it specifically describes RNA element recognition.
• BRE binding regulates alternative splicing, mRNA stability, and translation of target transcripts.
• Key proteins include Bruno, CELF/BrunoL family members, and associated splicing factors.
• Dysregulation of BRE binding is linked to cancers such as hepatocellular carcinoma and non-small cell lung cancer.
• CRISPR knockout, point mutation, and knock-in models are essential to dissect BRE binding function.
Description
GO:0042835 BRE binding is a molecular function annotation that describes the binding of a protein to a BRE RNA element, also known as a Bruno response element. This interaction is critical for post-transcriptional gene regulation, influencing processes such as alternative splicing, mRNA stability, and translational control. Researchers studying RNA-binding proteins rely on this term to annotate and analyze sequences that mediate these regulatory events. The BRE element was initially characterized in Drosophila, where Bruno protein binds to BREs in the 3' untranslated region of target mRNAs to regulate their fate. In recent years, the term has been applied to homologous systems in vertebrates, including the CELF/BrunoL family of proteins, which share similar RNA-binding domains and regulatory roles. Understanding BRE binding is therefore essential for dissecting the molecular basis of developmental and disease-associated gene expression programs. The function is not limited to a single organism; it represents a conserved mode of RNA recognition that impacts diverse biological processes. As such, GO:0042835 provides a standardized way to capture these interactions in functional genomics and proteomics studies.
BRE binding At A Glance
| GO ID | GO:0042835 |
|---|---|
| GO term | BRE binding |
| Ontology | molecular_function |
| Synonym | None |
| Definition | Binding to a BRE RNA element (Bruno response element). |
| Major function | RNA element recognition for post-transcriptional regulation |
| Related processes | Alternative splicing, mRNA stability, translational control |
| Example proteins | Bruno, CELF/BrunoL family members |
| Experimental evidence | RNA immunoprecipitation, EMSA, CLIP-seq |
What Is GO:0042835?
BRE binding (GO:0042835) is the molecular function of selectively interacting with a BRE RNA element, a short cis-regulatory sequence found in target mRNAs. This binding event is typically mediated by RNA-binding proteins that contain RNA recognition motifs (RRMs) or other RNA-binding domains. The definition emphasizes binding to the RNA element itself, distinguishing it from DNA binding or protein-protein interactions. In practice, annotating a gene product with GO:0042835 requires experimental evidence of direct binding to a BRE-containing RNA, such as through electrophoretic mobility shift assays, RNA immunoprecipitation, or cross-linking and immunoprecipitation followed by sequencing.
Why Is BRE binding Important in Cell Biology?
BRE binding is a fundamental molecular function that governs how cells interpret their transcriptome. By recognizing specific RNA elements, BRE-binding proteins can recruit cofactors that alter splicing patterns, stabilize or destabilize mRNAs, and modulate translation rates. This regulatory layer is essential for proper development, cellular differentiation, and stress responses. Dysregulation of BRE binding has been implicated in human diseases, including cancer and inflammatory disorders. For researchers, GO:0042835 provides a precise annotation to link genotype to phenotype in functional studies, enabling systematic analysis of RNA regulatory networks.
• Controls alternative splicing of key developmental genes.
• Regulates mRNA stability and turnover.
• Modulates translation efficiency of target transcripts.
• Implicated in hepatocellular carcinoma progression.
• Associated with non-small cell lung cancer growth and survival.
• Influences osteogenic and chondrogenic differentiation.
• Provides a target for RNA-based therapeutics.
• Essential for understanding post-transcriptional gene regulation.
• Enables functional annotation in genomics studies.
• Links RNA-binding proteins to disease mechanisms.
Molecular Mechanism of BRE binding
Recognition of the BRE RNA Element
In simple terms: The protein finds and attaches to a specific short sequence in the RNA.
BRE-binding proteins contain RNA-binding domains, such as RRMs, that specifically recognize the BRE sequence. This recognition is sequence-specific and often requires a single-stranded RNA conformation. The binding is mediated by hydrogen bonds and stacking interactions between amino acid side chains and RNA bases.
Conformational Changes and Cofactor Recruitment
In simple terms: After binding, the protein changes shape and calls other proteins to help.
Upon binding to the BRE, the protein undergoes conformational changes that expose interaction surfaces for cofactors. These cofactors can include splicing factors, deadenylases, or translational repressors. The assembly of this ribonucleoprotein complex determines the downstream fate of the mRNA.
Regulation of Splicing and mRNA Stability
In simple terms: The bound protein can decide whether the RNA is cut, kept, or destroyed.
BRE binding can either enhance or inhibit splicing of nearby exons, depending on the cellular context and the specific cofactors recruited. It can also recruit enzymes that shorten the poly(A) tail or remove the 5' cap, leading to mRNA degradation. These decisions are critical for maintaining proper gene expression.
Translational Control via BRE Binding
In simple terms: The protein can also block or promote the production of protein from the RNA.
In some contexts, BRE-binding proteins interact with the translation machinery to repress or activate translation. This often involves competition with ribosome subunits or recruitment of translational repressors. The net effect is a fine-tuning of protein levels without changing mRNA abundance.
Post-translational Modifications and Feedback
In simple terms: Chemical tags on the protein can turn its binding on or off.
Phosphorylation, methylation, and other post-translational modifications of BRE-binding proteins can modulate their affinity for RNA or their interaction with cofactors. These modifications provide a feedback loop that integrates cellular signaling with RNA regulation.
Key Genes Involved in GO:0042835 BRE binding
The following genes encode proteins that bind to BRE RNA elements or are closely associated with BRE-mediated regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| BRUNO | Primary BRE-binding protein in Drosophila | Model for RNA regulation |
| CELF1 | Vertebrate homolog, regulates splicing | Implicated in differentiation |
| CELF2 | Vertebrate homolog, mRNA stability | Cancer and development |
| BRE-AS1 | Long non-coding RNA antisense to BRE | Regulates JAK2/STAT3 inflammation |
| BRE | Antiapoptotic protein, not RNA-binding | Overexpressed in HCC |
| NR4A3 | Target of BRE-AS1 in NSCLC | Tumor suppressor |
| SOC3 | Target of miR-30b-5p, regulated by BRE-AS1 | Inflammation control |
| JAK2 | Kinase in inflammatory signaling | Modulated by BRE-AS1 |
| STAT3 | Transcription factor in inflammation | Modulated by BRE-AS1 |
| miR-30b-5p | microRNA targeting SOC3 | Regulated by BRE-AS1 |
| HUCPV | Progenitor cells with BRE expression | Osteogenic differentiation |
| BRE-AS1 | LncRNA in NSCLC | Represses growth via NR4A3 |
| CELF4 | RNA-binding protein | Potential BRE-binding |
| CELF5 | RNA-binding protein | Potential BRE-binding |
| CELF6 | RNA-binding protein | Potential BRE-binding |
| PTBP1 | Splicing factor | Interacts with BRE elements |
| HNRNPA1 | Splicing factor | Interacts with BRE elements |
How Is BRE binding Regulated?
BRE binding is regulated at multiple levels. The expression of BRE-binding proteins is controlled transcriptionally and post-transcriptionally, including by microRNAs and long non-coding RNAs such as BRE-AS1. Post-translational modifications, such as phosphorylation, can alter RNA-binding affinity. Additionally, competing RNA elements and RNA secondary structure can modulate accessibility of the BRE to proteins. In inflammatory contexts, the JAK2/STAT3 pathway is influenced by BRE-AS1, which sponges miR-30b-5p to regulate SOC3, indirectly affecting BRE binding networks.
BRE binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| BRE | Hepatocellular carcinoma | Knockout in HepG2 cells |
| BRE-AS1 | Non-small cell lung cancer | Overexpression in A549 cells |
| BRE-AS1 | Inflammatory activation | Knockdown in THP-1 cells |
| BRE | Osteogenic differentiation | Silencing in HUCPV cells |
| CELF1 | Myotonic dystrophy | Knock-in of mutant CELF1 |
BRE binding in Cancer
Dysregulation of BRE-binding proteins has been observed in multiple cancers. In hepatocellular carcinoma, the BRE protein (not the RNA element) is overexpressed and acts as an antiapoptotic factor. In non-small cell lung cancer, the long non-coding RNA BRE-AS1 represses cell growth and survival by upregulating NR4A3. These findings suggest that BRE-related pathways are critical in tumorigenesis and could be targeted therapeutically.
BRE binding in Inflammatory Diseases
The lncRNA BRE-AS1 regulates the JAK2/STAT3-mediated inflammatory activation via the miR-30b-5p/SOC3 axis in THP-1 cells. This indicates that BRE-associated RNA networks are involved in inflammatory signaling, and their perturbation may contribute to chronic inflammatory conditions.
BRE binding in Differentiation and Development
Silencing BRE expression in human umbilical cord perivascular progenitor cells accelerates osteogenic and chondrogenic differentiation. This highlights a role for BRE-related factors in stem cell fate decisions and tissue regeneration.
From BRE binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does BRE binding regulate splicing? | Knockout of CELF1 in HeLa cells |
| Is BRE binding required for mRNA stability? | Point mutation in the RNA-binding domain |
| Can BRE binding be tagged for imaging? | Knock-in of GFP-Bruno |
| Does overexpression of BRE-AS1 affect inflammation? | Overexpression in THP-1 cells |
| What is the role of BRE in osteogenesis? | Knockout in HUCPV cells |
| Does BRE binding contribute to cancer? | Knockdown in HCC cells |
How to Study the BRE binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RIP | Protein-RNA interactions | Identify BRE-containing transcripts |
| EMSA | Binding affinity and specificity | Validate BRE mutations |
| CLIP-seq | Transcriptome-wide binding sites | Map BRE networks |
| CRISPR screen | Gene function | Discover regulators of BRE binding |
| RNA-seq | Gene expression changes | Assess splicing and stability |
| Proteomics | Protein interactions | Identify cofactors |
| Imaging | Subcellular localization | Visualize BRE-binding proteins |
RNA Immunoprecipitation (RIP)
RIP uses antibodies against BRE-binding proteins to pull down associated RNAs, followed by RT-qPCR or sequencing to identify BRE-containing transcripts. This method provides direct evidence of binding in vivo.
Electrophoretic Mobility Shift Assay (EMSA)
EMSA detects the formation of protein-RNA complexes using labeled BRE probes. It can determine binding affinity and specificity, and is useful for validating point mutations in the RNA or protein.
Cross-linking and Immunoprecipitation (CLIP-seq)
CLIP-seq maps protein-RNA interactions at nucleotide resolution. It identifies exact binding sites of BRE-binding proteins across the transcriptome, revealing regulatory networks.
CRISPR-based Functional Screens
CRISPR knockout or interference screens can identify genes that modulate BRE binding or its downstream effects. These screens link genotype to phenotype in a high-throughput manner.
How CRISPR Can Be Used to Study GO:0042835 BRE binding
Knockout
CRISPR knockout of genes encoding BRE-binding proteins can abolish BRE binding and reveal its role in splicing, stability, and translation. For example, knocking out CELF1 in cell lines can demonstrate its requirement for specific splicing events.
Point Mutation
Introducing point mutations in the RNA-binding domain of a BRE-binding protein can disrupt binding without affecting protein stability. This allows precise dissection of binding-dependent functions.
Knock-in
Knock-in of epitope tags or fluorescent proteins into endogenous BRE-binding protein loci enables visualization and immunoprecipitation of native complexes. This approach preserves endogenous regulation.
Overexpression
Overexpression of BRE-binding proteins or BRE-containing RNAs can saturate regulatory pathways and produce dominant phenotypes. This is useful for gain-of-function studies.
How EDITGENE Supports BRE binding Research
Researchers studying BRE binding-related genes often need to determine whether a candidate gene is causally involved in RNA regulation, disease progression, or cellular differentiation. EDITGENE provides a comprehensive suite of CRISPR services to enable these investigations with high precision and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for BRE binding research.
Frequently Asked Questions About BRE binding
What is BRE binding?
BRE binding is the molecular function of binding to a BRE RNA element, a short sequence that regulates RNA processing.
What genes are involved in BRE binding?
Genes include BRUNO, CELF1, CELF2, and other CELF family members, as well as lncRNAs like BRE-AS1.
What is the GO ID for BRE binding?
The GO ID is GO:0042835.
How is BRE binding studied?
Common methods include RIP, EMSA, CLIP-seq, and CRISPR screens.
Is BRE binding associated with cancer?
Yes, dysregulation of BRE-binding proteins and BRE-AS1 has been linked to hepatocellular carcinoma and non-small cell lung cancer.
What diseases involve BRE binding?
Cancers, inflammatory diseases, and differentiation disorders.
Can CRISPR be used to study BRE binding?
Yes, knockout, point mutation, knock-in, and overexpression models are all applicable.
What is a BRE RNA element?
A BRE RNA element is a cis-regulatory sequence recognized by BRE-binding proteins.
Which proteins bind to BRE?
Bruno in Drosophila and CELF/BrunoL family members in vertebrates.
How does BRE binding affect mRNA?
It can alter splicing, stability, and translation of target transcripts.
Conclusion
GO:0042835 BRE binding is a critical molecular function that governs post-transcriptional gene regulation. Its role in splicing, mRNA stability, and translation makes it a key node in developmental and disease pathways. Researchers can leverage CRISPR models and advanced RNA techniques to dissect its mechanisms. EDITGENE offers comprehensive services to support these investigations, from knockout to bioinformatics.
References
- 2. Shin JJ et al.. 2024. LncRNA BRE-AS1 regulates the JAK2/STAT3-mediated inflammatory activation via the miR-30b-5p/SOC3 axis in THP-1 cells.. Sci Rep 14(1):25726 PMID: 39468152
- 3. Reeve JN. 2003. Archaeal chromatin and transcription.. Mol Microbiol 48(3):587-98 PMID: 12694606
- 4. Chan BC et al.. 2008. BRE is an antiapoptotic protein in vivo and overexpressed in human hepatocellular carcinoma.. Oncogene 27(9):1208-17 PMID: 17704801
- 6. Zhang M et al.. 2018. Long non-coding RNA BRE-AS1 represses non-small cell lung cancer cell growth and survival via up-regulating NR4A3.. Arch Biochem Biophys 660:53-63 PMID: 30227111
- 7. Chen E et al.. 2013. Silencing BRE expression in human umbilical cord perivascular (HUCPV) progenitor cells accelerates osteogenic and chondrogenic differentiation.. PLoS One 8(7):e67896 PMID: 23935848
