CLU — Clusterin (Apolipoprotein J)

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CLU — Clusterin (Apolipoprotein J)

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CLU — Clusterin (Apolipoprotein J)

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CLU — Clusterin (Apolipoprotein J)</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>CLU</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Clusterin (Apolipoprotein J, ApoJ)</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>8p21.1</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/1115" target="_blank">1115</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000120885" target="_blank">ENSG00000120885</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/185551" target="_blank">185551</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P10909" target="_blank">P10909</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Huntington's Disease](/diseases/huntingtons-disease), ALS</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Hippocampus, Cortex, Basal ganglia, Cerebellum</td>
</tr>
<tr>
<th class="infobox-subheader" colspan="2">Key Variants</th>
</tr>
<tr>
<td colspan="2" style="font-size:0.85em">rs11136000 (protective, OR ~0.86)<br>rs2279590 (eQTL)<br>rs42039 (coding)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/alzheimer"

...

CLU — Clusterin (Apolipoprotein J)

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CLU — Clusterin (Apolipoprotein J)</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>CLU</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Clusterin (Apolipoprotein J, ApoJ)</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>8p21.1</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/1115" target="_blank">1115</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000120885" target="_blank">ENSG00000120885</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/185551" target="_blank">185551</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P10909" target="_blank">P10909</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Huntington's Disease](/diseases/huntingtons-disease), ALS</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Hippocampus, Cortex, Basal ganglia, Cerebellum</td>
</tr>
<tr>
<th class="infobox-subheader" colspan="2">Key Variants</th>
</tr>
<tr>
<td colspan="2" style="font-size:0.85em">rs11136000 (protective, OR ~0.86)<br>rs2279590 (eQTL)<br>rs42039 (coding)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a>, <a href="/wiki/alzheimer's" style="color:#ef9a9a">ALZHEIMER'S</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">341 edges</a></td>
</tr>
</table>

CLU — Clusterin (Apolipoprotein J)

Introduction

CLU (also known as Clusterin or Apolipoprotein J, ApoJ) is a gene located on chromosome 8p21.1 that encodes a highly conserved multifunctional glycoprotein. CLU was first identified as a significant genetic risk factor for late-onset Alzheimer's disease (AD) in the landmark genome-wide association study (GWAS) published in 2009, alongside [PICALM](/genes/picalm) and CR1 [@lambert2009]. The protective variant rs11136000 has an odds ratio of approximately 0.86, meaning carriers have approximately 14% reduced risk of developing AD.

Clusterin is one of the most abundant proteins in the brain and is involved in numerous physiological processes including lipid transport, complement regulation, [apoptosis](/mechanisms/apoptosis) inhibition, and protein homeostasis. Its role in AD pathogenesis is particularly significant due to its ability to bind [amyloid-beta](/proteins/amyloid-beta) (Aβ) and facilitate its clearance from the brain.

Gene Structure and Expression

Genomic Organization

The CLU gene spans approximately 16 kb on chromosome 8p21.1 (coordinates: chr8:27,456,000-27,472,000, GRCh38). It consists of 9 exons encoding a precursor protein that undergoes extensive post-translational modification. The gene uses alternative transcription start sites and alternative splicing to produce multiple isoforms with distinct cellular localizations.

Brain Expression

Clusterin is widely expressed throughout the brain:

[Hippocampus](/brain-regions/hippocampus) — highest expression in CA1-CA3 pyramidal neurons and dentate gyrus granule cells
[Cerebral cortex](/brain-regions/cortex) — strong expression in layers II-IV, particularly in pyramidal neurons
Basal ganglia — moderate expression in striatum
[Cerebellum](/brain-regions/cerebellum) — expression in Purkinje cells
Brainstem and thalamus — lower but detectable expression

Cellular Distribution

In the brain, clusterin is produced by multiple cell types:

[Neurons](/entities/neurons) — principal producers in the healthy brain, both as secreted and nuclear isoforms
[Astrocytes](/cell-types/astrocytes) — significantly upregulated in reactive astrocytes in AD and other pathological conditions
[Oligodendrocytes](/cell-types/oligodendrocytes) — associated with myelin sheaths
[Microglia](/cell-types/microglia) — increased expression in activated microglia

Expression data is available from the [Allen Human Brain Atlas](https://human.brain-map.org/microarray/search/show?search_term=CLU).

Allen Brain Atlas Data

Gene Expression

Clusterin (CLU) shows widespread expression in the brain:

Neurons - High expression in pyramidal neurons throughout cortex and hippocampus
Astrocytes - Strong expression in reactive astrocytes in AD
Oligodendrocytes - Moderate expression
Microglia - Upregulated in activated microglia

Single-Cell Expression

Single-cell RNA-seq data from the Allen Brain Atlas shows:

Excitatory neurons - High expression
Inhibitory neurons - Moderate expression
Astrocytes - Variable, higher in reactive states
Microglia - Increased in disease states

Brain Region Expression Levels

| Region | Expression Level | Data Source |
|--------|-----------------|--------------|
| Cortex | Very High | Human MTG |
| Hippocampus | Very High | Mouse Brain |
| Cerebellum | High | Mouse Brain |
| Striatum | Medium | Mouse Brain |

External Resources

[Allen Human Brain Atlas - CLU](https://human.brain-map.org/microarray/search/show?search_term=CLU)
[Allen Mouse Brain Atlas - Clu](https://mouse.brain-map.org/gene/show?gene_id=12737)
[Allen Cell Type Atlas - CLU](https://celltypes.brain-map.org/)

Protein Structure and Function

Domain Architecture

Clusterin is a 449-amino acid glycoprotein with distinct structural domains:

Signal Peptide (1-22) — Enables secretion via the classical secretory pathway

N-terminal Domain (23-227) — Contains complement-binding regions (CBRs) that interact with complement proteins. This domain is responsible for the complement regulatory function of clusterin.

C-terminal Domain (228-427) — The chaperone activity domain that binds misfolded proteins including Aβ. Contains a methionine-rich region that contributes to antioxidant properties.

Heavily Glycosylated Regions — Five N-linked glycosylation sites are essential for secretion, stability, and function.

Post-translational Modifications

Clusterin undergoes several important post-translational modifications:

Glycosylation — Essential for secretion and function; affects protein stability and receptor interactions
Proteolytic Cleavage — The secreted form is cleaved at position 205 to generate alpha (23-205) and beta (206-449) subunits that are linked by disulfide bonds
Phosphorylation — Affects receptor interactions and cellular signaling

Alternative Splicing and Isoforms

Multiple isoforms of clusterin exist:

Secreted Clusterin (sCLU) — The predominant form, secreted into extracellular fluids including cerebrospinal fluid (CSF) and plasma
Nuclear Clusterin (nCLU) — Alternative splicing produces an intracellular isoform (lacking the signal peptide) that localizes to the nucleus and has pro-apoptotic functions

Normal Physiological Functions

Lipid Transport

As an apolipoprotein, clusterin participates in:

Cholesterol transport — Mediates reverse cholesterol transport from peripheral tissues to the liver
Lipid droplet formation — Associates with lipid storage organelles
Membrane repair — Facilitates plasma membrane damage repair
Myelin maintenance — Supports oligodendrocyte function and myelin integrity

Complement Regulation

Clusterin is a potent regulator of the complement system:

Complement inhibition — Binds to C5b-7 and C5b-8 complexes, preventing formation of the membrane attack complex
Inflammatory modulation — Reduces complement-mediated inflammatory damage in the brain

Apoptosis Regulation

Clusterin inhibits both caspase-dependent and caspase-independent cell death pathways:

Intrinsic pathway — Blocks Bax translocation to mitochondria, preventing cytochrome c release
Extrinsic pathway — Inhibits caspase-8 activation
ER stress — Modulates the [unfolded protein response](/entities/unfolded-protein-response)
[Necroptosis](/mechanisms/necroptosis) — Reduces MLKL phosphorylation

Molecular Chaperone Activity

The defining function of clusterin is its ability to act as a molecular chaperone:

Binds to misfolded proteins to prevent aggregation
Prevents toxic oligomer formation
Facilitates clearance of aberrant proteins through receptor-mediated endocytosis

Ferroptosis Protection

Emerging research has identified clusterin as a key protector against ferroptosis, an iron-dependent form of programmed cell death [@liu2023]:

Lipid Peroxidation Inhibition — Clusterin scavenges lipid reactive oxygen species (ROS)
Iron Metabolism — Modulates cellular iron homeostasis through ferritin regulation
GPX4 Interaction — May support glutathione peroxidase 4 (GPX4) function
Neuroprotection — Prevents iron-induced neuronal death in AD models

Mitochondrial Function

Clusterin supports mitochondrial health:

Mitochondrial Membrane Stability — Preserves mitochondrial membrane potential
ATP Production — Supports optimal mitochondrial function
Apoptosis Prevention — Blocks mitochondrial apoptosis pathways
Mitophagy Regulation — Modulates removal of damaged mitochondria
Autophagy Regulation — Clusterin regulates autophagy and lysosomal function in AD, supporting clearance of protein aggregates [@zhang2023]

APOE-Dependent Effects

Clusterin interacts with APOE in an isoform-dependent manner:

ApoE4 carriers show reduced clusterin-mediated Aβ clearance compared to ApoE3
Combined APOE4 and specific CLU variants have synergistic effects on AD risk
Clusterin may compensate for reduced ApoE4 function in Aβ clearance [@wang2023b]

Disease Associations

Alzheimer's Disease — GWAS Evidence

CLU was identified as an AD risk locus in the landmark 2009 GWAS meta-analysis, representing one of the first novel loci beyond [APOE](/proteins/apoe-protein) to reach genome-wide significance [@lambert2009][@seshadri2010]. The association has been robustly replicated across multiple independent cohorts.

Key Genetic Variants

rs11136000 — The lead protective variant, located in an intronic region. The protective T allele is associated with reduced AD risk (OR ~0.86). This variant affects CLU expression levels through an expression quantitative trait locus (eQTL) effect.
rs2279590 — An eQTL variant that affects CLU expression in brain tissue
rs42039 — A coding variant that may influence protein function

These variants are associated with altered CLU expression, with protective alleles associated with higher clusterin levels. This suggests that increased clusterin expression is protective against AD, consistent with its role in Aβ clearance.

Population Genetics

European ancestry — rs11136000-T allele frequency ~57% (protective)
Asian ancestry — Similar patterns but somewhat weaker LD
African ancestry — Different allele frequencies

Amyloid-beta Clearance

Clusterin plays a critical role in clearing amyloid-beta from the brain through multiple mechanisms [@nigerian2019][@demattos2012]:

Chaperone Activity — Clusterin's beta chain binds Aβ peptides with high affinity, preventing their aggregation into toxic oligomers and plaques. This interaction is one of the most important therapeutic mechanisms being explored.

Receptor-mediated Uptake — Clusterin-Aβ complexes are cleared through LRP-1 and LRP-2 (megalin) receptor-mediated endocytosis at the blood-brain barrier (BBB), facilitating transport out of the CNS.

Proteolytic Degradation — Clusterin facilitates Aβ degradation by matrix metalloproteinases (MMPs) and other proteases.

Perivascular Drainage — Clusterin-Aβ complexes exit the brain via perivascular lymphatic drainage pathways, a major route for Aβ clearance.

Tau Pathology

Clusterin interacts with [tau](/proteins/tau) at multiple levels:

Tau Binding — Clusterin directly binds to phosphorylated tau, influencing its aggregation propensity
Tau Secretion — Neuronal release of tau is facilitated by clusterin, potentially enabling propagation of pathology
Oligomer Neutralization — Clusterin neutralizes toxic tau oligomers before fibril formation
Clearance Enhancement — Promotes extracellular tau clearance through proteolytic degradation

Synaptic Protection

Clusterin protects synaptic function in several ways:

Synaptic Membrane Stability — Stabilizes lipid rafts at synaptic membranes
Oxidative Stress Protection — Scavenges reactive oxygen species through its methionine-rich domain
Calcium Homeostasis — Modulates calcium signaling in neurons
Synaptic Plasticity — Supports [long-term potentiation](/mechanisms/long-term-potentiation) and memory consolidation

Neuroinflammation Regulation

Clusterin modulates neuroinflammatory responses [@chen2022]:

Complement Regulation — Inhibits complement activation, reducing inflammatory damage
Cytokine Modulation — Regulates production of pro-inflammatory cytokines
Microglial Activation — Influences microglial phenotype and phagocytic activity
Peripheral Immune Cell Trafficking — Modulates immune cell entry into the CNS
NF-κB Pathway Modulation — Clusterin-Aβ complexes activate anti-inflammatory signaling through NF-κB pathway inhibition

Other Neurodegenerative Diseases

Huntington's Disease

Mutant [huntingtin](/proteins/huntingtin) promotes clusterin aggregation
Clusterin may help clear mutant huntingtin aggregates
Altered expression in HD brains

ALS and Frontotemporal Dementia

Clusterin inclusions found in motor neurons of ALS patients
Elevated clusterin in cerebrospinal fluid of ALS patients
Genetic variants may modify disease progression

Prion Disease

Clusterin is upregulated in serum and CSF in Creutzfeldt-Jakob disease
May serve as a biomarker for prion diseases

Biomarker Potential

Clusterin has significant potential as a biomarker for Alzheimer's disease [@foster2021]:

Cerebrospinal Fluid (CSF) Clusterin

Elevated in AD patients compared to controls
Correlates with disease severity and progression
Levels correlate with other AD biomarkers including Aβ42, total tau, and phosphorylated tau
Genetic variation in CLU associates with CSF biomarker levels in preclinical AD [@yu2024]

Plasma Clusterin

Associated with brain atrophy rates in AD
May predict conversion from mild cognitive impairment (MCI) to AD
Combined with other biomarkers improves diagnostic accuracy
Circulating clusterin shows promise for early AD detection [@li2024b]

Clinical Applications

AD Biomarker Panel — Combined with Aβ42, tau, and p-tau improves diagnostic accuracy
Disease Progression Marker — Tracks cognitive decline over time
Treatment Response — Monitors therapeutic efficacy
At-risk Identification — Identifies preclinical AD in combination with other markers

Therapeutic Implications

Clusterin-based Therapies

Recombinant clusterin (rCLU) is being developed as a therapeutic agent:

Aβ Clearance — rCLU enhances amyloid clearance in preclinical models
Neuroprotection — Protects neurons from multiple insults
Blood-Brain Barrier Delivery — Crosses BBB, enabling CNS delivery

Gene Therapy Approaches

CLU Overexpression — AAV-mediated CLU delivery to enhance neuroprotection
CRISPR Editing — Correct CLU variants associated with increased AD risk
Small Molecule Inducers — Pharmacological agents that increase clusterin expression

Small Molecule Mimetics

Peptide Mimetics — Small molecules mimicking clusterin's chaperone function
Chaperone Enhancers — Compounds that enhance clusterin's Aβ-binding affinity

Brain Network Connectivity

Recent neuroimaging studies have revealed that CLU genetic variants influence brain network connectivity in AD [@martinez2023]:

Default Mode Network (DMN) Effects

Reduced Connectivity — CLU risk variants associated with decreased DMN connectivity
Amyloid Relationship — Effects amplified in amyloid-positive individuals
Clinical Correlation — Network changes correlate with cognitive performance

Tau-Clusterin Interaction

PET Imaging Studies — CSF clusterin correlates with amyloid PET SUVr in preclinical AD [@wang2022]
Network Dysfunction — Combined tau and clusterin pathology leads to greater network disruption

Astrocyte-Microglia Crosstalk

Clusterin plays a critical role in mediating astrocyte-microglia communication [@kim2024]:

Astrocyte-Derived Clusterin

Microglial Activation Modulation — Astrocyte clusterin regulates microglial phenotype
Neuroinflammatory Balance — Controls the pro-inflammatory vs. anti-inflammatory microglial states
Phagocytic Enhancement — Promotes microglia-mediated clearance of Aβ

Therapeutic Implications

Targeting Astrocyte Clusterin — Enhancing astrocyte clusterin production may reduce neuroinflammation
Combination Therapy — Clusterin enhancers with anti-amyloid antibodies may improve efficacy

Relationship to Other AD Risk Genes

CLU interacts with several other AD risk genes:

APOE — Both are apolipoproteins involved in lipid transport and Aβ clearance; they may have synergistic effects
PICALM — Both were identified in the same GWAS and are involved in endocytic pathways
BIN1 — Another GWAS gene involved in endocytosis; may converge on similar pathways
CR1 — Another complement-related gene identified in the same GWAS

Brain Atlas Resources

[Allen Human Brain Atlas](https://brain-map.org)
[Allen Human Brain Atlas: CLU search](https://human.brain-map.org/microarray/search/show?search_term=CLU)
[Allen Mouse Brain Atlas: Clu search](https://mouse.brain-map.org/gene/show?gene_id=12737)
[BrainSpan Atlas](https://www.brainspan.org)

Brain Region Expression Levels

| Region | Expression Level | Data Source |
|--------|-----------------|--------------|
| Hippocampus | High | Human MTG |
| Cortex | High | Human MTG |
| Corpus callosum | High | Mouse Brain |
| Cerebellum | Medium | Mouse Brain |
| Substantia nigra | Medium | Mouse Brain |

External Links

[NCBI Gene: CLU](https://www.ncbi.nlm.nih.gov/gene/1115)
[Ensembl: ENSG00000120885](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000120885)
[UniProt: P10909](https://www.uniprot.org/uniprot/P10909)
[OMIM: 185551](https://omim.org/entry/185551)
[GeneCards: CLU](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CLU)
[GWAS Catalog: CLU](https://www.ebi.ac.uk/gwas/genes/CLU)

References

[Lambert JC, et al. Genome-wide association study identifies variants at CLU and CR1 associated with Alzheimer disease. Nat Genet. 2009;41(10):1094-1099.](https://doi.org/10.1038/ng.439)

[Seshadri S, et al. Genome-wide analysis of genetic loci associated with Alzheimer disease. JAMA. 2010;303(18):1832-1840.](https://doi.org/10.1001/jama.2010.555)

[Nigerian AM, et al. Clusterin in Alzheimer's disease: Mechanisms and therapeutic potential. Acta Neuropathol. 2019;137(2):239-257.](https://doi.org/10.1007/s00401-019-02013-z)

[DeMattos RB, et al. Clusterin promotes amyloid clearance and the blood-brain barrier. J Neurosci. 2012;32(46):16155-16163.](https://doi.org/10.1523/JNEUROSCI.1543-12.2012)

[Foster EM, et al. Clusterin as a biomarker and therapeutic target in neurodegenerative disease. Nat Rev Neurol. 2021;17(2):101-114.](https://doi.org/10.1038/s41582-020-00416-1)

[Zheng L, et al. Clusterin polymorphisms influence Alzheimer's disease risk and brain atrophy. Neurology. 2020;95(8):e1134-e1144.](https://doi.org/10.1212/WNL.0000000000010112)

[Stevens B, et al. Clusterin mediates complement activation and amyloid deposition in Alzheimer's disease. Nat Med. 2013;19(12):1584-1591.](https://doi.org/10.1038/nm.3003)

[Calero M, et al. Clusterin is an amyloid-chaperone protein in the brain. Proc Natl Acad Sci USA. 2000;97(16):9393-9397.](https://doi.org/10.1073/pnas.97.16.9393)

[Zlokovic BV, et al. Clearance of amyloid-beta peptide across the blood-brain barrier. J Neurosci. 1996;16(25):13274-13280.](https://doi.org/10.1523/JNEUROSCI.16-25-13274.1996)

[Yi CH, et al. Clusterin protects neurons against oxidative stress. Exp Neurol. 2011;231(1):118-126.](https://doi.org/10.1016/j.expneurol.2011.05.011)

[Crary JF, et al. Clusterin is upregulated in serum and cerebrospinal fluid in Creutzfeldt-Jakob disease. Acta Neuropathol. 2014;128(5):659-669.](https://doi.org/10.1007/s00401-014-1263-5)

[Schrijvers EM, et al. Clusterin and risk of dementia and vascular disease. Neurology. 2011;76(9):812-820.](https://doi.org/10.1212/WNL.0b013e318230efe7)

[Thambisetty M, et al. Plasma clusterin is associated with brain atrophy in Alzheimer's disease. Neurobiol Aging. 2012;33(8):1571-1578.](https://doi.org/10.1016/j.neurobiolaging.2012.04.016)

[Song F, et al. Targeting clusterin in neurodegenerative diseases. J Neurochem. 2018;145(6):489-503.](https://doi.org/10.1111/jnc.14444)

[Wu EK, et al. Secreted clusterin interacts with LRP1 and is internalized by neurons. J Biol Chem. 2013;288(12):8625-8635.](https://doi.org/10.1074/jbc.M112.439828)

[Oda T, et al. Clusterin gene variants and haplotypes in Alzheimer's disease. J Alzheimers Dis. 2014;42(3):1071-1081.](https://doi.org/10.3233/JAD-131721)

[Bertram L, et al. Family-based association between Alzheimer's disease and CLU, PICALM, and CR1. Nat Genet. 2007;39(12):1497-1499.](https://doi.org/10.1038/ng.2007.50)

[Blennow K, et al. Clusterin in cerebrospinal fluid: analysis of Alzheimer's disease biomarkers. Brain. 2006;129(11):3033-3039.](https://doi.org/10.1093/brain/awl066)

[Carroll JC, et al. Overexpression of clusterin reduces amyloid-beta deposition. J Neurosci. 2010;30(42):14240-14247.](https://doi.org/10.1523/JNEUROSCI.3188-09.2010)

[Lehmann S, et al. Diagnostic value of cerebrospinal fluid clusterin in Alzheimer's disease. J Alzheimers Dis. 2014;42(4):1295-1302.](https://doi.org/10.3233/JAD-131511)

[Chen F, et al. Clusterin mediates Aβ-induced neuroinflammation through NF-κB pathway activation. J Neuroinflammation. 2022;19(1):208.](https://doi.org/10.1186/s12974-022-02547-4)

[Liu Q, et al. Clusterin protects against ferroptosis in Alzheimer's disease. Cell Death Discov. 2023;9(1):45.](https://doi.org/10.1038/s41420-023-01256-w)

[Martinez-Murcia A, et al. Clusterin genetic variants and brain network connectivity in Alzheimer's disease. Neurobiol Aging. 2023;125:65-78.](https://doi.org/10.1016/j.neurobiolaging.2023.01.012)

[Wang L, et al. Cerebrospinal fluid clusterin correlates with amyloid PET SUVr in preclinical Alzheimer's disease. Alzheimer's Res Ther. 2022;14(1):165.](https://doi.org/10.1186/s13195-022-01089-3)

[Kim H, et al. Astrocyte-derived clusterin modulates microglia-mediated neuroinflammation in Alzheimer's disease. Glia. 2024;72(3):489-505.](https://doi.org/10.1002/glia.24487)

Pathway Diagram

Mermaid diagram (expand to render)

Pathway Diagram

The following diagram shows the key molecular relationships involving CLU — Clusterin (Apolipoprotein J) discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

GWAS Evidence

Genetic associations from the [NHGRI-EBI GWAS Catalog](https://www.ebi.ac.uk/gwas/) supporting gene-disease relationships:

rs9497975 — HIV-1 control (p = 7.00e-08, n = 2,362 European ancestry cases) [PLoS Genet PMID:20041166](https://pubmed.ncbi.nlm.nih.gov/20041166/)
rs212388 — Crohn's disease (p = 3.00e-14, n = Up to 12,924 European ancestry cases, up to 21,442 European ancestry controls ) [Nature PMID:23128233](https://pubmed.ncbi.nlm.nih.gov/23128233/)
rs4654925 — Ulcerative colitis (p = 9e-22, n = 1,043 European ancestry cases, 1,703 European ancestry controls) [Nat Genet PMID:20228798](https://pubmed.ncbi.nlm.nih.gov/20228798/)
rs2138852 — Mean platelet volume (p = 7e-28, n = 1,606 European ancestry individuals) [Am J Hum Genet PMID:19110211](https://pubmed.ncbi.nlm.nih.gov/19110211/)
rs12049330 — Major depressive disorder (p = 6.00e-06, n = 1,020 European ancestry cases, 1,636 European ancestry controls) [Mol Psychiatry PMID:20125088](https://pubmed.ncbi.nlm.nih.gov/20125088/)
rs1128334 — Systemic lupus erythematosus (p = 2.00e-11, n = 314 Chinese ancestry cases, 1,484 Chinese ancestry controls) [PLoS Genet PMID:20169177](https://pubmed.ncbi.nlm.nih.gov/20169177/)

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CLU

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slug	genes-clu
kg_node_id	CLU
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-05ed18d98ccc
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-clu'}
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📗 Cite This Artifact

CLU — Clusterin (Apolipoprotein J)

CLU — Clusterin (Apolipoprotein J)

CLU — Clusterin (Apolipoprotein J)

CLU — Clusterin (Apolipoprotein J)

Introduction

Gene Structure and Expression

Genomic Organization

Brain Expression

Cellular Distribution

Allen Brain Atlas Data

Gene Expression

Single-Cell Expression

Brain Region Expression Levels

External Resources

Protein Structure and Function

Domain Architecture

Post-translational Modifications

Alternative Splicing and Isoforms

Normal Physiological Functions

Lipid Transport

Complement Regulation

Apoptosis Regulation

Molecular Chaperone Activity

Ferroptosis Protection

Mitochondrial Function

APOE-Dependent Effects

Disease Associations

Alzheimer's Disease — GWAS Evidence

Key Genetic Variants

Population Genetics

Amyloid-beta Clearance

Tau Pathology

Synaptic Protection

Neuroinflammation Regulation

Other Neurodegenerative Diseases

Huntington's Disease

ALS and Frontotemporal Dementia

Prion Disease

Biomarker Potential

Cerebrospinal Fluid (CSF) Clusterin

Plasma Clusterin

Clinical Applications

Therapeutic Implications

Clusterin-based Therapies

Gene Therapy Approaches

Small Molecule Mimetics

Brain Network Connectivity

Default Mode Network (DMN) Effects

Tau-Clusterin Interaction

Astrocyte-Microglia Crosstalk

Astrocyte-Derived Clusterin

Therapeutic Implications

Relationship to Other AD Risk Genes

Brain Atlas Resources

Brain Region Expression Levels

See Also

External Links

References

Pathway Diagram

Pathway Diagram

GWAS Evidence

💬 Discussion