Rbfox1 Antibody
Description
Overview of RBFOX1 Antibodies
RBFOX1 antibodies are immunochemical reagents designed to detect and quantify the RBFOX1 protein in experimental models. These antibodies enable researchers to investigate RBFOX1's roles in RNA splicing, neuronal development, and disease pathogenesis .
Splicing Regulation
RBFOX1 antibodies have been used to identify its role in muscle-specific splicing. Knockout studies in mice revealed aberrant splicing of myofibrillar and calcium-handling genes (e.g., Serca1, Ryr1), leading to tubular aggregates and impaired muscle function .
Neuronal Excitability
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Hippocampal Studies: RBFOX1 loss increases neuronal hyperexcitability and seizure susceptibility. Antibodies confirmed reduced Vamp1 protein levels, a vSNARE critical for inhibitory synaptic transmission .
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BDNF Signaling: Overexpression studies using RBFOX1 antibodies linked elevated RBFOX1 to destabilized TrkB.T1 receptors, impairing hippocampal long-term potentiation .
Disease Associations
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Autism Spectrum Disorders: RBFOX1 antibodies helped identify cytoplasmic mislocalization in autism models, correlating with synaptic defects .
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Cancer: Altered RBFOX1 expression, detected via IHC, is associated with tumor progression and metastasis .
Technical Considerations
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Cross-Reactivity: Most antibodies recognize human, mouse, and rat RBFOX1, but confirm species compatibility (e.g., PA5-59307 is human-specific) .
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Epitope Stability: Antibodies targeting the N-terminus (e.g., CAB7811) may miss isoforms lacking exon A53, which are prevalent in the cerebellum .
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Validation: BioLegend’s 862701 antibody includes RRID AB_2801247, ensuring reproducibility .
Case Study: Muscle Pathology
In Rbfox1⁻/⁻ mice, antibodies revealed:
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Tubular Aggregates: Mislocalized Serca1 and Ryr1 proteins in cytoplasmic aggregates .
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Calcium Dysregulation: Delayed calcium release and reduced force generation in stimulated muscle fibers .
Future Directions
RBFOX1 antibodies are pivotal for exploring:
Product Specs
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Target Background
- Research indicates that Rbfox1-isoform1 plays a significant role in neuronal migration and synapse network formation during corticogenesis. Disruptions in these critical processes can lead to structural and functional defects in cortical neurons, potentially contributing to the pathophysiology of neurodevelopmental disorders associated with RBFOX1 abnormalities. PMID: 27481563
- Upon picrotoxin treatment, Rbfox1 expression is downregulated by miR-129-5p, enabling the repression of Atp2b4 and Dcx. PMID: 28487411
- Cytoplasmic Rbfox1 target mRNAs are enriched in genes involved in cortical development and autism. PMID: 26687839
- Rbfox1 regulates RNA splicing essential for skeletal muscle structure and function. PMID: 25575511
- Fox-1, specifically expressed during the neural cell stage, promotes Mef2c exon beta inclusion via the GCAUG. PMID: 20141540
- Findings suggest that A2BP1 plays significant roles in neuronal tissues, regulated in a spatiotemporal manner. PMID: 23918472
- Results indicate that a component of FSHD pathogenesis may arise from over-expression of FRG1, leading to reduced Rbfox1 levels and aberrant expression of an altered Calpain 3 protein through dysregulated splicing. PMID: 23300487
- Fox-1 splices mRNAs encoding proteins crucial for synaptic transmission and membrane excitation. PMID: 23027929
- The splicing regulator Rbfox1 controls neuronal excitation in the mammalian brain. PMID: 21623373
- Data demonstrate that A2BP1 mutations may clinically affect specific forebrain neuron types during early development. PMID: 21346316
- These results highlight the crucial role of the Fox protein family in fine-tuning the properties of CaV1.2 calcium channels during neuronal development. PMID: 19564422
- Fox-1/Ataxin 2-Binding Protein 1 (A2BP1), a protein implicated in various neurological diseases, can counteract the effects of chronic depolarization on splicing. PMID: 19762510
Q&A
How to validate Rbfox1 antibody specificity in neuronal versus muscle tissue contexts?
Methodological Answer:
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Step 1: Perform Western blotting using lysates from Rbfox1-knockout (KO) models (e.g., Nes-Cre; R26-Rbfox1 flox mice) to confirm absence of signal .
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Step 2: Use isoform-specific primers (e.g., for 1D.1 or 1A isoforms) in RT-qPCR to correlate protein and mRNA expression levels .
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Step 3: Cross-validate with RNA-binding assays (e.g., iCLIP) to ensure antibody detects Rbfox1-RNA complexes in neuronal nuclei .
Data Table:
| Validation Method | Tissue Type | Key Target | Validation Outcome |
|---|---|---|---|
| Western Blot | Hippocampus | TrkB.T1 | Reduced signal in KO models |
| IHC | Muscle | Rbfox1 | No change in satellite cell regeneration |
What advanced strategies resolve contradictions in Rbfox1 isoform detection?
Experimental Design:
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Issue: Antibodies may fail to distinguish between Rbfox1 isoforms (e.g., 1D.1 vs. 1A) due to shared epitopes .
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Solution:
Case Study:
In cortical tissues, isoform 1D.1 showed a 40% decrease in expression in mutants, while 1A increased by 25%, highlighting the need for isoform-specific validation .
How to optimize Rbfox1 antibody protocols for RNA-binding studies?
Methodological Framework:
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Nuclear Fractionation: Separate chromatin-bound (HMW) and soluble nuclear fractions to identify Rbfox1’s RNA-binding activity .
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Pulse-Chase Assays: Use 5-ethynyluridine (EU) labeling to measure TrkB.T1 mRNA stabilization by Rbfox1 (p ≤ 0.05 in neurons) .
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Mutant Controls: Compare wild-type Rbfox1 with RNA-binding-deficient mutants (e.g., F158A) to confirm antibody specificity .
Critical Data:
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iCLIP hits in Ntrk2 3’-UTR confirm direct Rbfox1-TrkB.T1 interaction .
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Mutant Rbfox1 (F158A) fails to stabilize TrkB.T1, proving functional dependence on RNA binding .
What are key considerations for cross-species reactivity in Rbfox1 studies?
Advanced Analysis:
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Primer Design: Use conserved regions (e.g., human HAR.505 homologs) for cross-species RT-qPCR .
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Epitope Mapping: Compare human vs. mouse Rbfox1 sequences for antibody compatibility (e.g., 98% homology in RNA-binding domains) .
Table: Cross-Species Reactivity Risks
| Species | Epitope Region | Reactivity Risk |
|---|---|---|
| Human | HAR.505 | High (accelerated evolution) |
| Mouse | Exon 7 | Moderate (Δ2xHAR mutants) |
How to address false negatives in Rbfox1 functional assays?
Troubleshooting Guide:
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Low Sensitivity: Use cell type-specific isolation (e.g., FACS for neuronal subtypes) to detect Rbfox1 in sparse populations .
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Antibody Dilution: Titrate antibodies (1:500–1:2000) to avoid saturation in tissues with high TrkB.T1 expression .
Example:
In Rbfox1 Δ2xHAR.505 mutants, whole-tissue RNA-seq missed Rbfox1 changes detectable only in cortical subpopulations .
What functional assays link Rbfox1 antibody signals to disease mechanisms?
Research-Grade Workflow:
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Neurodevelopmental Models: Assess Rbfox1-TrkB.T1 axis in epilepsy or autism models (e.g., Rbfox1 KO mice with seizure phenotypes) .
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Splicing Analysis: Use RNA-seq to identify aberrant splicing events (e.g., Camta1) in Rbfox1-deficient tissues .
Key Finding:
Rbfox1 overexpression increases TrkB.T1 levels by 2.5-fold, impairing BDNF-dependent LTP in hippocampal neurons (p ≤ 0.001) .
