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DAB2 — Disabled Clathrin Adaptor Protein
DAB2 — Disabled Clathrin Adaptor Protein
<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">DAB2</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>DAB2</td></tr>
<tr><td><strong>Full Name</strong></td><td>Disabled 2, Clathrin Adaptor Protein</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>5p13.2</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[1601](https://www.ncbi.nlm.nih.gov/gene/1601)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[604241](https://www.omim.org/entry/604241)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000153046</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P98073](https://www.uniprot.org/uniprot/P98073)</td></tr>
<tr><td><strong>Protein Name</strong></td><td>Disabled-2 (DAB2)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), Cancer, Endocytic Disorders</td></tr>
</table>
</div>
Overview
DAB2 (Disabled-2) encodes a clathrin-associated adaptor protein that plays critical roles in [endocytosis](/mechanisms/endocytosis), [signal transduction](/mechanisms/signal-transduction), and protein homeostasis. Originally identified as a phosphotyrosine-binding protein, DAB2 functions as a key regulator of clathrin-mediated endocytosis and participates in various cellular processes including receptor trafficking, cell signaling, and synaptic function[@mishra2002].
DAB2 — Disabled Clathrin Adaptor Protein
<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">DAB2</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>DAB2</td></tr>
<tr><td><strong>Full Name</strong></td><td>Disabled 2, Clathrin Adaptor Protein</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>5p13.2</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[1601](https://www.ncbi.nlm.nih.gov/gene/1601)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[604241](https://www.omim.org/entry/604241)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000153046</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P98073](https://www.uniprot.org/uniprot/P98073)</td></tr>
<tr><td><strong>Protein Name</strong></td><td>Disabled-2 (DAB2)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), Cancer, Endocytic Disorders</td></tr>
</table>
</div>
Overview
DAB2 (Disabled-2) encodes a clathrin-associated adaptor protein that plays critical roles in [endocytosis](/mechanisms/endocytosis), [signal transduction](/mechanisms/signal-transduction), and protein homeostasis. Originally identified as a phosphotyrosine-binding protein, DAB2 functions as a key regulator of clathrin-mediated endocytosis and participates in various cellular processes including receptor trafficking, cell signaling, and synaptic function[@mishra2002].
DAB2 is particularly important in the [central nervous system](/brain-regions/cortex), where it regulates [amyloid precursor protein](/entities/app-protein) (APP) processing, [tau](/proteins/tau) phosphorylation, and synaptic function. Altered DAB2 expression has been observed in [Alzheimer's disease](/diseases/alzheimers-disease) brains, suggesting a role in disease pathogenesis[@barrett2010].
Molecular Biology
Gene Structure
The DAB2 gene is located on chromosome 5p13.2 and consists of 22 exons spanning approximately 30 kb. It encodes two major isoforms through alternative splicing:
- DAB2 isoform A (p96): Full-length protein (830 aa)
- DAB2 isoform B (p67): Truncated isoform lacking N-terminal sequences
Protein Structure
DAB2 contains several functional domains:
PTB Domain Function
The PTB domain of DAB2 recognizes the NPXY motif found in many transmembrane receptors:
- LDL Receptor Family: LDLR, LRP1, LRP2
- Integrins: β-subunits
- APP: Amyloid precursor protein
- Notch: Notch receptors
Role in Endocytosis
Clathrin-Mediated Endocytosis
DAB2 functions as a sorting adaptor at multiple stages of clathrin-mediated endocytosis:
Clathrin-Independent Endocytosis
DAB2 also participates in clathrin-independent pathways[@mishra2002]:
- Caveolae-mediated endocytosis
- RhoA-regulated pathways
- Macropinocytosis
Receptor Trafficking
DAB2 regulates trafficking of multiple receptor families:
| Receptor Family | DAB2 Function | Neuronal Relevance |
|-----------------|---------------|-------------------|
| LDL Receptor | Cargo selection | Lipid metabolism |
| LRP1 | Signal transduction | Aβ clearance |
| Integrins | Cell adhesion | Neuronal migration |
| EGFR | Signal modulation | Growth factor signaling |
Role in Alzheimer's Disease
APP Processing
DAB2 directly interacts with APP and influences its processing:
Tau Pathology
DAB2 involvement in [tau](/proteins/tau) phosphorylation:
- Modulates kinases and phosphatases affecting tau
- Alters intracellular tau trafficking
- May influence tau aggregation
Synaptic Dysfunction
In neurons, DAB2 affects:
- Synaptic Vesicle Recycling: Regulates endocytic machinery
- Receptor Trafficking: Controls AMPA, NMDA receptor turnover
- Synaptic Plasticity: Modifies long-term potentiation
Neuroinflammation
DAB2 in glial cells:
- Regulates cytokine receptor trafficking
- Modulates microglial activation
- Affects inflammatory responses
Role in Parkinson's Disease
Alpha-Synuclein Trafficking
DAB2 involvement in [Parkinson's Disease](/diseases/parkinsons-disease):
- Regulates [alpha-synuclein](/proteins/alpha-synuclein) endocytosis
- Modulates lysosomal delivery
- Affects protein clearance pathways
Dopaminergic Neuron Function
- Receptor trafficking in substantia nigra neurons
- Endocytic function in dopaminergic terminals
- Vulnerability to oxidative stress
Membrane Trafficking
DAB2 in PD-relevant pathways:
- ER-to-Golgi transport
- Endosomal system function
- Autophagy modulation
Signal Transduction
Receptor Signaling
DAB2 modulates multiple signaling pathways:
MAPK/ERK Pathway
DAB2 regulates MAPK signaling:
- Modulates RTK signal termination
- Affects ERK activation kinetics
- Influences neuronal differentiation
Cell Adhesion Signaling
At synapses, DAB2 affects:
- PSD-95 interactions
- NMDA receptor function
- Synaptic scaffold assembly
Expression Patterns
Tissue Distribution
DAB2 is expressed in most tissues:
- Brain: Highest expression in neurons
- Epithelial Cells: Polarized trafficking
- Immune Cells: Receptor signaling
- Fibroblasts: Adhesion and migration
Brain Region Specificity
- Cerebral Cortex: High in pyramidal neurons
- Hippocampus: CA1-CA3 regions, dentate gyrus
- Cerebellum: Purkinje cells
- Substantia Nigra: Dopaminergic neurons
Cellular Localization
- Plasma Membrane: Primary endocytic sites
- Cytoplasm: Diffuse distribution
- Golgi Apparatus: Post-Golgi trafficking
- Synaptic Terminals: Presynaptic vesicles
Interaction Network
Adaptor Protein Complexes
- AP-2: Clathrin adaptor complex
- AP-1: Golgi trafficking
- AP-3: Lysosomal targeting
Cytoskeletal Proteins
- Clathrin: Coat protein
- Dynamin: Vesicle scission
- Amphiphysin: BAR domain protein
Signaling Proteins
- Grb2: Growth factor signaling
- Shc: RTK adaptors
- Crk: Phosphotyrosine signaling
Neuronal Proteins
- APP: Amyloid precursor protein
- LRP1: Low-density lipoprotein receptor-related protein 1
- NMDA Receptors: Glutamate receptors
- AMPA Receptors: Glutamate receptors
Therapeutic Implications
Targeting DAB2 in Neurodegeneration
Therapeutic strategies targeting DAB2:
Drug Development Strategies
| Strategy | Approach | Disease |
|----------|----------|---------|
| Small Molecule Activators | Enhance DAB2 function | AD |
| Peptide Mimetics | PTB domain agonists | AD/PD |
| Gene Therapy | Viral expression | PD |
Combination Approaches
- DAB2 modulators with secretase inhibitors
- Endocytosis enhancers with Aβ antibodies
- Synaptic function restoration with tau modulators
Animal Models
Knockout Studies
- DAB2 KO mice: Embryonic lethal (developmental defects)
- Heterozygous mice: Viable with subtle phenotypes
Conditional Knockout
- Neuron-specific KO: Memory deficits
- Astrocyte-specific KO: Gliosis changes
Transgenic Models
- DAB2 overexpression: Protective in some models
- DAB2 mutants: Dominant-negative effects
Disease Models
- AD models: DAB2 expression changes correlate with pathology
- PD models: DAB2 in alpha-synuclein models
Clinical Significance
Biomarker Potential
- DAB2 expression as disease marker
- CSF levels in neurodegenerative disease
- Genetic variants and disease risk
Diagnostic Applications
- Disease progression markers
- Therapeutic response monitoring
- Subtype classification
Key Research Findings
| Year | Finding | Model/Context |
|------|---------|---------------|
| 2002 | DAB2 in clathrin-independent endocytosis | Cell culture |
| 2010 | DAB2 in AD brain | Human tissue |
| 2017 | APP processing modulation | Cell culture |
| 2019 | DAB2 in protein homeostasis | Review |
| 2020 | DAB2 and synaptic function | Neuronal culture |
| 2022 | DAB2 targeting in AD | Preclinical |
Disease Mechanisms Summary
Alzheimer's Disease Pathogenesis
DAB2 contributes to AD through:
- Altered β-secretase access
- Affected γ-secretase trafficking
- Aβ production modulation
- Impaired vesicle recycling
- Receptor trafficking defects
- Plasticity alterations
- Endocytic pathway impairment
- Lysosomal dysfunction
- Aggregate clearance issues
Parkinson's Disease Pathogenesis
DAB2 involvement in PD:
- Endocytic uptake modulation
- Degradation pathway regulation
- Propagation mechanisms
- Receptor trafficking stress
- Oxidative stress sensitivity
- Membrane trafficking deficits
Cross-Links
- [Endocytosis](/mechanisms/endocytosis)
- [Signal Transduction](/mechanisms/signal-transduction)
- [Clathrin-Mediated Endocytosis](/mechanisms/clathrin-endocytosis)
- [Lipid Metabolism](/mechanisms/lipid-metabolism)
- [LRP1](/proteins/lrp1)
- [Amyloid Precursor Protein](/entities/app-protein)
- [Alzheimer's Disease Mechanisms](/diseases/alzheimers-disease)
- [Parkinson's Disease Mechanisms](/diseases/parkinsons-disease)
See Also
- [Genes Index](/genes)
- [Proteins Index](/proteins)
- [Mechanisms Index](/mechanisms)
- [Brain Regions](/brain-regions)
External Links
- NCBI Gene: [1601](https://www.ncbi.nlm.nih.gov/gene/1601)
- Ensembl: [ENSG00000153046](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000153046)
- UniProt: [P98073](https://www.uniprot.org/uniprot/P98073)
- GeneCards: [DAB2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=DAB2)
References
▸Metadataorigin_type: v1_polymorphic_backfill
| slug | genes-dab2 |
| kg_node_id | DAB2 |
| entity_type | gene |
| origin_type | v1_polymorphic_backfill |
| source_table | wiki_pages |
| wiki_page_id | wp-298ab585e337 |
| __merged_from | {'merged_at': '2026-05-13', 'unprefixed_id': 'genes-dab2'} |
| _schema_version | 1 |
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