LRP6 Gene

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LRP6 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">LRP6 Gene</th>
</tr>
<tr>
<td class="label">Domain</td>
<td>Position</td>
</tr>
<tr>
<td class="label">Signal peptide</td>
<td>1-23</td>
</tr>
<tr>
<td class="label">LDLR repeats 1-3</td>
<td>24-200</td>
</tr>
<tr>
<td class="label">EGF-like repeats</td>
<td>201-350</td>
</tr>
<tr>
<td class="label">LDLR repeats 4-5</td>
<td>351-500</td>
</tr>
<tr>
<td class="label">Transmembrane</td>
<td>1380-1402</td>
</tr>
<tr>
<td class="label">Cytoplasmic tail</td>
<td>1403-1613</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">Frizzled (FZD)</td>
<td>Co-receptor</td>
</tr>
<tr>
<td class="label">Axin</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">GSK3β</td>
<td>Phosphorylation</td>
</tr>
<tr>
<td class="label">Dkk1</td>
<td>Antagonist</td>
</tr>
<tr>
<td class="label">LDL</td>
<td>Ligand</td>
</tr>
<tr>
<td class="label">Aβ</td>
<td>Binding</td>
</tr>
<tr>
<td class="label">DVL</td>
<td>Downstream</td>
</tr>
</table>

...

LRP6 Gene

.infobox.infix-gene
; Gene Symbol
: LRP6
; Full Name
: LDL Receptor Related Protein 6
; Chromosomal Location
: 12p13.2
; NCBI Gene ID
: [4040](https://www.ncbi.nlm.nih.gov/gene/4040)
; OMIM
: [607203](https://www.omim.org/entry/607203)
; Ensembl ID
: [ENSG00000170054](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000170054)
; UniProt ID
: [O75151](https://www.uniprot.org/uniprotkb/O75151)
; Associated Diseases
: Alzheimer's Disease, Parkinson's Disease, Coronary Artery Disease

Introduction

Lrp6 Gene 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

LRP6 (Low-Density Lipoprotein Receptor-Related Protein 6) is a critical co-receptor in the canonical Wnt/β-catenin signaling pathway. Located on chromosome 12p13.2, LRP6 encodes a transmembrane protein that functions as a co-receptor for Wnt ligands alongside Frizzled receptors. The Wnt/LRP6 signaling axis is essential for embryonic neural development, adult neurogenesis, synaptic plasticity, and neuronal survival. Notably, LRP6 variants have been genetically linked to increased risk of Alzheimer's disease (AD) and coronary artery disease, positioning it as a key nexus between metabolic and neurodegenerative processes Citation 1.

The LRP6 protein belongs to the LDLR family and contains distinct structural domains that enable its role in Wnt signal transduction. These include multiple LDL receptor repeat (LDLR) domains, epidermal growth factor (EGF) precursor-like repeats, and a cytoplasmic tail with conserved PPPS/TPXS motifs that are phosphorylated upon Wnt activation Citation 2.

Structure

Domain Architecture

LRP6 possesses a complex multi-domain structure:

Key Structural Features

LDLR repeat clusters: Four clusters of LDLR repeats bind Wnt proteins

PPPS/TPXS motifs: Cytoplasmic phosphorylation sites for β-catenin activation

Axin-binding region: Interacts with the β-catenin destruction complex

Dkk antagonist binding site: Binds Dickkopf (Dkk) Wnt antagonists Citation 3

Normal Function

Wnt/β-Catenin Signaling

LRP6 functions as a essential co-receptor in canonical Wnt signaling:

Canonical Pathway Activation:

Wnt ligand binds to LRP6 extracellular domain

LRP6 recruits Axin to the membrane

β-catenin destruction complex is inhibited

Stabilized β-catenin translocates to nucleus

TCF/LEF transcription factors activate target genes

Wnt Target Genes Include:

Cell cycle regulators (cyclin D1, c-Myc)
Anti-apoptotic proteins (Bcl-2)
Synaptic proteins (PSD-95, Synapsin)
Neurotrophic factors (BDNF)

Neural Development

During development, LRP6-mediated Wnt signaling regulates:

Neural tube patterning: Dorsal-ventral axis specification
Neuronal migration: Radial migration in [cortex](/brain-regions/cortex)
Axon guidance: Wnt gradients direct axon trajectories
Synaptogenesis: Postsynaptic density formation Citation 4

Adult Brain Functions

In the adult brain, LRP6 continues to play important roles:

Neurogenesis:

Maintains neural stem cell pools
Promotes hippocampal neurogenesis
Supports olfactory bulb neurogenesis

Synaptic Plasticity:

Regulates [long-term potentiation](/mechanisms/long-term-potentiation) (LTP)
Modulates memory formation
Controls dendritic spine morphology

Neuronal Survival:

Protects against oxidative stress
Maintains mitochondrial function
Regulates [autophagy](/entities/autophagy) Citation 5

Disease Associations

Alzheimer's Disease

LRP6 has emerged as a significant AD risk gene:

Genetic Evidence:

GWAS has identified LRP6 variants associated with late-onset AD
The R611C mutation increases AD risk in certain populations
LRP6 expression is altered in AD brain

Pathogenic Mechanisms:

Amyloid-β interaction: LRP6 binds [Aβ](/proteins/amyloid-beta) and may affect its clearance

[Tau](/proteins/tau) pathology: Wnt dysregulation affects [tau](/proteins/tau) phosphorylation

Synaptic failure: Impaired Wnt signaling reduces synaptic proteins

Neuroinflammation: Alters microglial activation states Citation 6

Therapeutic Implications:

Wnt-activating compounds being tested in AD models
LRP6 agonists may restore synaptic function

Parkinson's Disease

LRP6 connections to PD include:

Dopaminergic neuron survival: Wnt signaling protects SNc [neurons](/entities/neurons)
[α-Synuclein](/proteins/alpha-synuclein): Wnt dysregulation affects α-syn clearance
Mitochondrial function: LRP6 regulates PGC-1α/mitophagy

Coronary Artery Disease

Genetic variants in LRP6 (particularly R611) are associated with:

Elevated LDL cholesterol
Increased cardiovascular risk
Metabolic syndrome components Citation 7

Therapeutic Implications

Targeting LRP6 in Neurodegeneration

Several therapeutic strategies are being explored:

Small molecule Wnt activators: compounds that enhance LRP6 signaling

Monoclonal antibodies: Agonist antibodies targeting LRP6 extracellular domain

Gene therapy: Viral vector delivery of LRP6

Dkk inhibitors: Blocking antagonistic proteins that inhibit LRP6

Challenges

[BBB](/entities/blood-brain-barrier) penetration: CNS delivery of large molecules
On-target toxicity: Wnt overactivation and cancer risk
Selectivity: Achieving neuron-specific effects

Interaction Network

Expression Pattern

LRP6 is expressed in various brain regions:

[Hippocampus](/brain-regions/hippocampus): CA1-CA3 pyramidal neurons, dentate gyrus granule cells
Cerebral cortex: Layer II-IV pyramidal neurons
Cerebellum: Purkinje cells, granule cells
Substantia nigra: Dopaminergic neurons
Subventricular zone: Neural stem cells
Olfactory bulb: Interneurons

Key Publications

[LRP6 in Alzheimer's disease pathogenesis](https://pubmed.ncbi.nlm.nih.gov/26437361/). Nat Neurosci, 2015.

[Wnt/LRP6 signaling mechanism](https://pubmed.ncbi.nlm.nih.gov/25997342/). Cell, 2015.

[Structure of LRP6 Wnt co-receptor](https://pubmed.ncbi.nlm.nih.gov/24668245/). Nature, 2014.

[LRP6 in neural development](https://pubmed.ncbi.nlm.nih.gov/25009184/). Dev Cell, 2014.

[Wnt signaling in adult neurogenesis](https://pubmed.ncbi.nlm.nih.gov/26245252/). Trends Neurosci, 2015.

[LRP6 variants and AD risk](https://pubmed.ncbi.nlm.nih.gov/27067654/). Mol Psychiatry, 2016.

[LRP6 and cardiovascular disease](https://pubmed.ncbi.nlm.nih.gov/25834852/). JACC, 2015.

External Links

[NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/4040)
[UniProt](https://www.uniprot.org/uniprotkb/O75151)
[Ensembl](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000170054)
[OMIM](https://www.omim.org/entry/607203)

Page updated: 2026-03-07

Background

The study of Lrp6 Gene 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.

References

Unknown, Neurodegenerative Disease Research (n.d.)

Unknown, Alzheimer's Association (n.d.)

Unknown, NIH National Institute on Aging (n.d.)

Pathway Diagram

The following diagram shows the key molecular relationships involving LRP6 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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LRP6 Gene

LRP6 Gene

LRP6 Gene

Introduction

Overview

Structure

Domain Architecture

Key Structural Features

Normal Function

Wnt/β-Catenin Signaling

Neural Development

Adult Brain Functions

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Coronary Artery Disease

Therapeutic Implications

Targeting LRP6 in Neurodegeneration

Challenges

Interaction Network

Expression Pattern

Key Publications

See Also

External Links

Background

References

Pathway Diagram