.infobox.infix-gene
; Gene Symbol
: LRP6
; Full Name
: LDL Receptor Related Protein 6
; Chromosomal Location
: 12p13.2
; NCBI Gene ID
: 4040
; OMIM
: 607203
; Ensembl ID
: ENSG00000170054
; UniProt ID
: O75151
; Associated Diseases
: Alzheimer's Disease, Parkinson's Disease, Coronary Artery Disease
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.
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].
¶ Domain Architecture
LRP6 possesses a complex multi-domain structure:
| Domain |
Position |
Function |
| Signal peptide |
1-23 |
Protein targeting |
| LDLR repeats 1-3 |
24-200 |
Ligand binding |
| EGF-like repeats |
201-350 |
Protein interactions |
| LDLR repeats 4-5 |
351-500 |
Co-receptor function |
| Transmembrane |
1380-1402 |
Membrane anchoring |
| Cytoplasmic tail |
1403-1613 |
Signal transduction |
- 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]
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)
During development, LRP6-mediated Wnt signaling regulates:
- Neural tube patterning: Dorsal-ventral axis specification
- Neuronal migration: Radial migration in cortex
- Axon guidance: Wnt gradients direct axon trajectories
- Synaptogenesis: Postsynaptic density formation [Citation 4]
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 (LTP)
- Modulates memory formation
- Controls dendritic spine morphology
Neuronal Survival:
- Protects against oxidative stress
- Maintains mitochondrial function
- Regulates autophagy [Citation 5]
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 and may affect its clearance
- Tau pathology: Wnt dysregulation affects 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
LRP6 connections to PD include:
- Dopaminergic neuron survival: Wnt signaling protects SNc neurons
- α-Synuclein: Wnt dysregulation affects α-syn clearance
- Mitochondrial function: LRP6 regulates PGC-1α/mitophagy
Genetic variants in LRP6 (particularly R611) are associated with:
- Elevated LDL cholesterol
- Increased cardiovascular risk
- Metabolic syndrome components [Citation 7]
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
- BBB penetration: CNS delivery of large molecules
- On-target toxicity: Wnt overactivation and cancer risk
- Selectivity: Achieving neuron-specific effects
| Partner |
Interaction Type |
Function |
| Frizzled (FZD) |
Co-receptor |
Wnt signal reception |
| Axin |
Direct binding |
β-catenin regulation |
| GSK3β |
Phosphorylation |
Kinase regulation |
| Dkk1 |
Antagonist |
Wnt inhibition |
| LDL |
Ligand |
Lipid metabolism |
| Aβ |
Binding |
Amyloid interaction |
| DVL |
Downstream |
Signal transduction |
LRP6 is expressed in various 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
- LRP6 in Alzheimer's disease pathogenesis. Nat Neurosci, 2015.
- Wnt/LRP6 signaling mechanism. Cell, 2015.
- Structure of LRP6 Wnt co-receptor. Nature, 2014.
- LRP6 in neural development. Dev Cell, 2014.
- Wnt signaling in adult neurogenesis. Trends Neurosci, 2015.
- LRP6 variants and AD risk. Mol Psychiatry, 2016.
- LRP6 and cardiovascular disease. JACC, 2015.
Page updated: 2026-03-07
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.
- Neurodegenerative Disease Research - Comprehensive reviews on disease mechanisms
- Alzheimer's Association - Disease information and current research
- NIH National Institute on Aging - Research updates and clinical trials