LRP8 Gene

LRP8 Gene

Introduction

Lrp8 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.

<div class="infobox infobox-gene"> [@supsup2014]
<table> [@supsup2014a]
<tr><th>Gene Symbol</th><td>LRP8</td></tr> [@supsup2013]
<tr><th>Full Name</th><td>Low-Density Lipoprotein Receptor-Related Protein 8</td></tr> [@supsup2008]
<tr><th>Aliases</th><td>ApoER2, LDLRR, CLR6.1</td></tr> [@supsup2018]
<tr><th>Chromosomal Location</th><td>1p31.3</td></tr>
<tr><th>NCBI Gene ID</th><td>7807</td></tr>
<tr><th>OMIM</th><td>607869</td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000157193</td></tr>
<tr><th>UniProt ID</th><td>Q9Y6W5</td></tr>
<tr><th>Protein Length</th><td>870 amino acids</td></tr>
<tr><th>Protein Class</th><td>LDL Receptor Family</td></tr>
<tr><th>Associated Diseases</th><td>Alzheimer's Disease, Stroke, Intellectual Disability, Amyotrophic Lateral Sclerosis</td></tr>
</table>
</div>

Overview

LRP8 Gene

Introduction

Lrp8 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.

<div class="infobox infobox-gene"> [@supsup2014]
<table> [@supsup2014a]
<tr><th>Gene Symbol</th><td>LRP8</td></tr> [@supsup2013]
<tr><th>Full Name</th><td>Low-Density Lipoprotein Receptor-Related Protein 8</td></tr> [@supsup2008]
<tr><th>Aliases</th><td>ApoER2, LDLRR, CLR6.1</td></tr> [@supsup2018]
<tr><th>Chromosomal Location</th><td>1p31.3</td></tr>
<tr><th>NCBI Gene ID</th><td>7807</td></tr>
<tr><th>OMIM</th><td>607869</td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000157193</td></tr>
<tr><th>UniProt ID</th><td>Q9Y6W5</td></tr>
<tr><th>Protein Length</th><td>870 amino acids</td></tr>
<tr><th>Protein Class</th><td>LDL Receptor Family</td></tr>
<tr><th>Associated Diseases</th><td>Alzheimer's Disease, Stroke, Intellectual Disability, Amyotrophic Lateral Sclerosis</td></tr>
</table>
</div>

Overview

LRP8 (Low-Density Lipoprotein Receptor-Related Protein 8), also known as ApoER2, is a member of the LDL receptor family primarily expressed in the brain. It serves as a critical receptor for the extracellular matrix protein Reelin, playing essential roles in neuronal migration during development, synaptic plasticity, and cognitive function. LRP8 also functions as a receptor for [APOE](/proteins/apoe-protein)-containing lipoproteins, linking lipid metabolism to neuronal function. Genetic variants in LRP8 have been associated with Alzheimer's disease risk, stroke, and neurodevelopmental disorders.[@supsup2006]

Gene Structure

The LRP8 gene:

• Located on chromosome 1p31.3
• Contains 31 exons spanning approximately 40 kb
• Produces multiple splice variants with tissue-specific expression
• Alternative splicing generates isoforms with differing cytoplasmic tails

Splice Variants

| Isoform | Expression | Key Features |
|---------|------------|--------------|
| Full-length | Brain | Contains NPXY motifs for endocytosis |
| Variant 1 | Testis | Lacks part of cytoplasmic tail |
| Variant 2 | Various | Alternative exon usage |

Protein Structure

LRP8 is a modular receptor protein:

Extracellular Domain (1-726)

Transmembrane Domain (727-749)

• Single-pass transmembrane helix

Cytoplasmic Tail (750-870)

• NPxY motifs: Two motifs for endocytosis and signaling
• Phosphorylation sites: Regulate protein interactions

Normal Function

Reelin Signaling

LRP8 is a critical receptor for Reelin:[@supsup2014]

Reelin-LRP8-Dab1 Cascade

Reelin → LRP8/Dab1 → PI3K/Akt → GSK-3β inhibition → Tau phosphorylation ↓
↓
Cytoskeletal regulation
↓
Neuronal positioning

Lipid Metabolism

• Binds APOE-containing lipoproteins (especially ApoE4)
• Regulates brain cholesterol homeostasis
• Modulates lipid delivery to neurons

Expression Pattern

Brain Regions

LRP8 is highly expressed in:[@supsup2014a]

• [Hippocampus](/brain-regions/hippocampus): CA1-CA3 pyramidal neurons, dentate gyrus
• Cerebral [cortex](/brain-regions/cortex): Layer II-IV neurons
• Cerebellum: Purkinje cells
• Olfactory bulb: Mitral and tufted cells

Cellular Expression

• [Neurons](/entities/neurons): Primary expression in excitatory neurons
• [Astrocytes](/entities/astrocytes): Lower expression
• Endothelial cells: At the [blood-brain barrier](/entities/blood-brain-barrier)

Development vs. Adult

• Embryonic: High expression during cortical development
• Adult: Maintained in mature neurons, particularly in hippocampus

Disease Associations

Alzheimer's Disease

LRP8 plays complex roles in AD:[@supsup2013]

• [Aβ](/proteins/amyloid-beta) metabolism: LRP8 affects neuronal Aβ uptake and clearance
• Reelin dysfunction: Impaired Reelin-LRP8 signaling in AD brain
• [Tau](/proteins/tau) pathology: Modulates [tau](/proteins/tau) phosphorylation via [GSK-3β](/entities/gsk3-beta)
• Genetic association: LRP8 variants modify AD risk
• Synaptic dysfunction: Contributes to synaptic loss

Stroke and Cerebrovascular Disease

• Ischemic stroke: LRP8 polymorphisms increase stroke risk
• Cerebral amyloid angiopathy: May affect vascular Aβ clearance
• Vascular contributions: Links lipid metabolism to cerebrovascular health

Neurodevelopmental Disorders

• Intellectual disability: Rare LRP8 mutations cause autosomal recessive ID
• Autism spectrum disorder: Some ASD-associated variants
• Lissencephaly: Impaired neuronal migration

Amyotrophic Lateral Sclerosis (ALS)

• Altered LRP8 expression in ALS motor neurons
• Possible role in excitotoxicity

Molecular Mechanisms

LRP8 in Synaptic Function

| Mechanism | Effect | Relevance |
|-----------|--------|-----------|
| NMDA receptor modulation | Enhances NMDAR function | Synaptic plasticity |
| AMPA receptor trafficking | Regulates AMPAR insertion | [LTP](/mechanisms/long-term-potentiation) |
| Dendritic spine formation | Promotes spine growth | Synapse structure |
| Reelin signaling | Activates downstream pathways | Development, plasticity |

Interaction with Other Proteins

• Reelin: Primary ligand
• Dab1: Intracellular adaptor protein
• APOE: Lipoprotein receptor for ApoE
• NMDA receptors: Functional interaction
• PSD-95: Synaptic scaffolding

Therapeutic Implications

Therapeutic Strategies

| Approach | Target | Status |
|----------|--------|--------|
| Reelin agonists | Activate LRP8 signaling | Preclinical |
| LRP8 modulators | Enhance receptor function | Research |
| Gene therapy | AAV-LRP8 delivery | Preclinical |
| Combination therapy | With anti-amyloid agents | Research |

AD Therapeutic Potential

• Reelin-enhancing compounds: Could improve synaptic function
• LRP8 activators: Promote Aβ clearance
• Small molecule mimetics: Reelin-mimetic peptides

Animal Models

• LRP8 knockout mice: Show cortical migration defects
• Conditional knockouts: Brain-specific deletion studies
• Transgenic models: LRP8 overexpression

See Also

• [LRP8 Protein](/proteins/lrp8-protein)
• [LRP1 Gene](/proteins/lrp1-protein) - Related LDL receptor family member
• [APOE Gene](/proteins/apoe) - Major AD risk gene
• [Reelin Signaling](/mechanisms/reelin-signaling)
• [Synaptic Plasticity Mechanisms](/mechanisms/synaptic-plasticity)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Stroke](/diseases/stroke)

External Links

• [NCBI Gene: LRP8](https://www.ncbi.nlm.nih.gov/gene/7807)
• [UniProt: LRP8](https://www.uniprot.org/uniprot/Q9Y6W5)
• [OMIM: LRP8](https://www.omim.org/entry/607869)
• [GeneCards: LRP8](https://www.genecards.org/cgi-bin/carddisp.pl?gene=LRP8)

Background

The study of Lrp8 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.

Brain Atlas Resources

• [Allen Human Brain Atlas - LRP8 Expression](https://human.brain-map.org/microarray/search/show?search_term=LRP8)
• [Allen Brain Atlas - Gene Overview](https://portal.brain-map.org/explore/genes/mouse?symbol=LRP8)
• [BrainSpan - Developmental Transcriptome](https://brainspan.org/static/pdf/BrainSpanRNAseqDecTable2015.pdf)

References

PMID: 17053810(https://pubmed.ncbi.nlm.nih.gov/17053810/) PMID: 25429323(https://pubmed.ncbi.nlm.nih.gov/25429323/) PMID: 24542778(https://pubmed.ncbi.nlm.nih.gov/24542778/) PMID: 23643451(https://pubmed.ncbi.nlm.nih.gov/23643451/) PMID: 18614536(https://pubmed.ncbi.nlm.nih.gov/18614536/) PMID: 29114855(https://pubmed.ncbi.nlm.nih.gov/29114855/)

Pathway Diagram

The following diagram shows the key molecular relationships involving LRP8 Gene discovered through SciDEX knowledge graph analysis: