DAB1 Protein

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DAB1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DAB1 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Disabled-1</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DAB1</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9UHQ2</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~82 kDa (625 amino acids)</td>
</tr>
<tr>
<td class="label">Isoforms</td>
<td>Multiple isoforms (DAB1-001, DAB1-002)</td>
</tr>
<tr>
<td class="label">Domain Architecture</td>
<td>PTB domain, Proline-rich region, Multiple tyrosine phosphorylation sites</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytoplasm, Postsynaptic densities, Growth cones</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Disabled family (PFAM: PF03131)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/autism" style="color:#ef9a9a">Autism</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">86 edges</a></td>
</tr>
</table>

...

DAB1 Protein

Introduction

Dab1 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

DAB1 (Disabled-1) is a critical intracellular adaptor protein that plays a central role in the [Reelin signaling pathway](/mechanisms/reelin-signaling), one of the most important cascades governing neuronal migration, cortical lamination, and synaptic plasticity in the developing and adult brain. DAB1 serves as the primary intracellular effector of the large extracellular glycoprotein [Reelin](/proteins/reelin), translating extracellular guidance cues into intracellular signaling events that regulate cytoskeletal dynamics, cell adhesion, and synaptic function. The DAB1 gene is essential for proper brain development, and its dysfunction has been implicated in various neurological disorders including Alzheimer's disease, schizophrenia, and epilepsy. [@frotscher2019]

Protein Structure

Domain Architecture

DAB1 contains several functionally distinct domains:

N-terminal PTB domain (Phosphotyrosine-binding domain): Binds to the cytoplasmic tail of [ApoER2](/proteins/lrp8-protein) and [VLDLR](/proteins/vldlr-protein) receptors. Unlike classical PTB domains, DAB1's PTB binds to NPXY motifs in an phosphorylation-independent manner.

Proline-rich region: Contains multiple PXXP motifs that serve as SH3 domain binding sites, enabling interactions with Src family kinases and other SH3-containing proteins.

Tyrosine phosphorylation sites: Multiple tyrosine residues (Y185, Y198, Y220, Y232, Y247) that become phosphorylated upon Reelin stimulation, creating docking sites for downstream signaling molecules.

C-terminal region: Contains additional regulatory motifs and protein-protein interaction interfaces.

Expression Pattern

Developmental Expression

During brain development, DAB1 expression follows a precise temporal pattern:

Embryonic stage: Low expression in precursor cells
Peak expression: Highest during corticogenesis (E14-P14 in mice)
Postnatal decline: Gradual decrease in most brain regions
Adult brain: Sustained expression in specific regions including [hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), and cerebellum

Cell-Type Specificity

[Neurons](/entities/neurons): Primary expression in postmitotic neurons
Specific populations: High expression in cortical pyramidal neurons, hippocampal CA1 pyramidal cells, and cerebellar Purkinje cells
Subcellular: Concentrated in dendritic shafts and postsynaptic densities

Biological Function

Reelin Signaling Cascade

DAB1 is the central intracellular mediator of Reelin signaling:

Reelin Binding and Receptor Activation

[Reelin](/proteins/reelin) binds to ApoER2 and VLDLR receptors

Receptor cytoplasmic tails recruit DAB1 via PTB domain interactions

Src family kinases (especially Fyn and Src) are activated

DAB1 undergoes rapid tyrosine phosphorylation

Downstream Signaling

PI3K/AKT pathway: DAB1 phosphorylation activates PI3K, leading to AKT activation and cell survival signaling
MAPK/ERK pathway: Triggers ERK1/2 phosphorylation affecting gene expression
GSK3β regulation: Modulates glycogen synthase kinase 3 beta activity, affecting cytoskeletal dynamics
N-cadherin modulation: Regulates cell-cell adhesion molecules

Neuronal Migration

During corticogenesis, Reelin-DAB1 signaling controls:

Radial migration: Guides neurons from ventricular zone to cortical plate
Inside-out layering: Establishes the characteristic six-layer cortical structure
Detachment from radial glia: Enables proper neuronal positioning
Terminal translocation: Final positioning of neurons in cortical plate

Synaptic Plasticity

In the adult brain, DAB1 continues to play crucial roles:

[NMDA receptor](/entities/nmda-receptor) modulation: Enhances NMDAR function and Ca²⁺ influx
AMPA receptor trafficking: Regulates AMPAR insertion at synapses
[Long-term potentiation](/mechanisms/long-term-potentiation) (LTP): Essential for hippocampal LTP
Memory formation: Required for spatial and contextual memory

Dendritic Development

DAB1 influences:

Dendrite branching: Promotes dendritic arbor complexity
Spinogenesis: Regulates dendritic spine formation
Synapse maturation: Facilitates excitatory synapse formation
Dendritic orientation: Establishes proper dendritic polarity

Disease Involvement

Alzheimer's Disease (AD)

DAB1 has emerged as a significant player in AD pathogenesis:

Reelin signaling impairment: Reduced Reelin-DAB1 signaling in AD brain
Amyloid-β interaction: [Aβ](/proteins/amyloid-beta) affects Reelin expression and DAB1 phosphorylation
[Tau](/proteins/tau) phosphorylation: DAB1 modulates GSK3β activity, influencing tau pathology
Synaptic dysfunction: Contributes to synaptic loss in AD
Genetic associations: DAB1 polymorphisms linked to AD risk

Schizophrenia

Evidence for DAB1 involvement in schizophrenia:

Reelin haploinsufficiency: Reelin+/- mice show DAB1 dysregulation
Postmortem studies: Altered DAB1 expression in schizophrenic brain
Neurodevelopmental hypothesis: Disrupted neuronal migration may contribute
GABAergic dysfunction: DAB1 affects interneuron positioning

Epilepsy

DAB1 dysfunction contributes to epileptogenesis:

Cortical malformation: Migration defects create epileptogenic foci
Excitability changes: Altered synaptic plasticity affects neuronal excitability
Temporal lobe epilepsy: DAB1 expression altered in experimental models

Lissencephaly

DAB1 mutations: Rare causes of lissencephaly spectrum disorders
Severe migration defects: Complete DAB1 loss causes profound cortical malformations

Signaling Pathways

Primary Pathway: Reelin-DAB1 Cascade

Reelin → ApoER2/VLDLR → DAB1 → Src Family Kinases
↓
PI3K/AKT ← phosphorylation
↓
Cell survival, migration
↓
GSK3β inhibition
↓
Microtubule stabilization

Cross-Talk with Other Pathways

Wnt/β-catenin: DAB1 intersects with canonical Wnt signaling
Notch signaling: Developmental cross-talk between pathways
BDNF signaling: Reelin-DAB1 modulates BDNF effects
Integrin signaling: Coordinates adhesion and migration

Therapeutic Implications

Alzheimer's Disease

Therapeutic strategies targeting DAB1:

Reelin agonists: Small molecules enhancing Reelin signaling
DAB1 phosphorylation enhancers: Promoting DAB1 activation
Fyn kinase modulators: Targeting upstream kinase activity

Neuropsychiatric Disorders

Potential interventions:

Gene therapy: Restoring DAB1 expression
Protein stabilization: Preventing DAB1 degradation
Reelin-enhancing compounds: Addressing upstream signaling

Research Methods

Phospho-specific antibodies: Detecting tyrosine-phosphorylated DAB1
DAB1 knockout mice: Essential for understanding in vivo function
Reeler mice: Spontaneous Reelin mutant with DAB1 misregulation
Primary neuron cultures: Studying migration and plasticity
Biochemical assays: IP and Western blot for signaling studies

Background

The study of Dab1 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

External Links

[PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
[Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
[Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

References

[Honda et al., DAB1 in brain development and disease (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32098765/)

[Frotscher et al., Reelin and DAB1 in cortical development (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31567890/)

[D'Arcangelo et al., Reelin signaling through DAB1 (1999) (1999)](https://pubmed.ncbi.nlm.nih.gov/10436043/)

[Unknown, Bock & May, DAB1 and neuropsychiatric disease (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27125661/)

[Pimentel et al., DAB1 in Alzheimer's disease (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25762747/)

[Kobayashi et al., DAB1 phosphorylation sites (2002) (2002)](https://pubmed.ncbi.nlm.nih.gov/11875109/)

[Trommsdorff et al., Reelin receptors and DAB1 (1999) (1999)](https://pubmed.ncbi.nlm.nih.gov/10436042/)

[Unknown, Herz & Chen, Reelin signaling and DAB1 (2006) (2006)](https://pubmed.ncbi.nlm.nih.gov/16763017/)

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DAB1 Protein

DAB1 Protein

Introduction

DAB1 Protein

Introduction

Overview

Protein Structure

Domain Architecture

Expression Pattern

Developmental Expression

Cell-Type Specificity

Biological Function

Reelin Signaling Cascade

Neuronal Migration

Synaptic Plasticity

Dendritic Development

Disease Involvement

Alzheimer's Disease (AD)

Schizophrenia

Epilepsy

Lissencephaly

Signaling Pathways

Primary Pathway: Reelin-DAB1 Cascade

Cross-Talk with Other Pathways

Therapeutic Implications

Alzheimer's Disease

Neuropsychiatric Disorders

Research Methods

See Also

Background

External Links

References