NLRC5 — NLR Family CARD Domain Containing 5

Migration, Crosslink

📖

NLRC5 — NLR Family CARD Domain Containing 5

active

wiki page Created: 2026-04-02T07:19:25 By: crosslink-migration Quality: 50% ✓ SciDEX ID: wiki-genes-nlrc5

📖 Wiki Page

gene1972 wordssynced 2026-04-02

NLRC5 — NLR Family CARD Domain Containing 5

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">NLRC5</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>NLRC5</td></tr>
<tr><td><strong>Full Name</strong></td><td>NLR Family CARD Domain Containing 5</td></tr>
<tr><td><strong>Chromosome</strong></td><td>16q13</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[126926](https://www.ncbi.nlm.nih.gov/gene/126926)</td></tr>
<tr><td><strong>OMIM</strong></td><td>613851</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000148488</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q86TI2](https://www.uniprot.org/uniprot/Q86TI2)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>NLR (NOD-like receptor) family</td></tr>
<tr><td><strong>Expression</strong></td><td>Ubiquitous, high in immune cells</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/breast-cancer" style="color:#ef9a9a">Breast Cancer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a>, <a href="/wiki/tumor" style="color:#ef9a9a">Tumor</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">54 edges</a></td>
</tr>
</table>
</div>

Overview

...

NLRC5 — NLR Family CARD Domain Containing 5

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">NLRC5</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>NLRC5</td></tr>
<tr><td><strong>Full Name</strong></td><td>NLR Family CARD Domain Containing 5</td></tr>
<tr><td><strong>Chromosome</strong></td><td>16q13</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[126926](https://www.ncbi.nlm.nih.gov/gene/126926)</td></tr>
<tr><td><strong>OMIM</strong></td><td>613851</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000148488</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q86TI2](https://www.uniprot.org/uniprot/Q86TI2)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>NLR (NOD-like receptor) family</td></tr>
<tr><td><strong>Expression</strong></td><td>Ubiquitous, high in immune cells</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/breast-cancer" style="color:#ef9a9a">Breast Cancer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a>, <a href="/wiki/tumor" style="color:#ef9a9a">Tumor</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">54 edges</a></td>
</tr>
</table>
</div>

Overview

NLRC5 (NLR family CARD domain containing 5) is the largest member of the NOD-like receptor (NLR) family, containing over 2000 amino acids. It serves as a critical regulator of the innate immune system, primarily controlling MHC class I gene expression and modulating inflammatory responses[@meinnel2021]. Beyond its well-established role in adaptive immunity, emerging evidence positions NLRC5 as an important modulator of neuroinflammation in the central nervous system (CNS), with significant implications for understanding and potentially treating neurodegenerative diseases including Alzheimer's disease (AD) and Parkinson's disease (PD)[@davoli2017].

Gene and Protein Structure

Gene Organization

The NLRC5 gene (Gene ID: 126926) is located on chromosome 16q13 in humans and spans approximately 23 kb. The gene consists of 44 coding exons that encode a protein of 2026 amino acids with a molecular weight of approximately 220 kDa[@meinnel2021].

Protein Architecture

NLRC5 contains several distinct functional domains:

N-terminal CARD domain: The caspase recruitment domain (CARD) mediates protein-protein interactions with downstream signaling molecules, particularly in NF-κB and type I interferon signaling pathways.

NOD/NACHT domain: The central nucleotide oligomerization domain is responsible for ATP binding and protein self-oligomerization, essential for inflammasome formation and signal transduction.

Leucine-rich repeat (LRR) domain: The C-terminal LRR region functions as a sensory domain, detecting microbial components and cellular stress signals.

This architecture positions NLRC5 as both a sensor of cellular stress and a scaffold for assembling signaling complexes that regulate immune gene expression[@kobayashi2021].

Biological Functions

MHC Class I Regulation

NLRC5 is the master transcriptional regulator of MHC class I genes. It directly controls the expression of:

HLA-A, HLA-B, HLA-C (classical MHC class I)
Beta-2 microglobulin
Components of the antigen processing machinery (TAP1, TAP2, ERAAP)

This function is critical for adaptive immune surveillance and has implications for immune responses in the CNS where MHC class I expression on neurons and glia modulates synaptic plasticity and immune privilege[@lupfer2013][@benko2010].

Inflammasome Activity

Unlike NLRP3, NLRC5 does not typically form canonical inflammasomes. However, it can modulate inflammasome activity through protein-protein interactions with other NLR family members. Recent studies suggest crosstalk between NLRC5 and NLRP3 in microglia, where NLRC5 can either potentiate or inhibit NLRP3-dependent cytokine production depending on cellular context[@rootwell2020][@kelley2019].

NF-κB Signaling

NLRC5 negatively regulates NF-κB signaling through multiple mechanisms:

Competition with NOD2 for signaling intermediates
Direct interaction with IKK complex components
Modulation of TAK1 kinase activity[@xu2018]

This regulatory function is particularly relevant in neuroinflammation, where excessive NF-κB activation drives microglial production of pro-inflammatory cytokines.

Role in Neurodegeneration

Alzheimer's Disease

Multiple lines of evidence connect NLRC5 to Alzheimer's disease pathogenesis[@liu2022][@davoli2017]:

Microglial Regulation: NLRC5 expression in microglia modulates the inflammatory environment in AD brains. Studies show that:

NLRC5 levels correlate with disease severity
Altered NLRC5 expression affects amyloid clearance efficiency
NLRC5 regulates cytokine production in response to amyloid-beta

Antigen Presentation: By controlling MHC class I expression, NLRC5 influences how neurons present antigens to cytotoxic T cells, potentially affecting the immune surveillance of the CNS.

Neuroinflammation: NLRC5 deficiency in microglial cells leads to:

Increased production of IL-1β, TNF-α, and IL-6
Enhanced neurotoxicity in co-culture models
Exacerbated cognitive deficits in mouse models

Parkinson's Disease

NLRC5 plays a particularly important role in dopaminergic neuron survival[@chen2021][@torres2021]:

Dopaminergic Neuron Protection: A landmark study demonstrated that NLRC5 deficiency leads to:

Increased vulnerability of dopaminergic neurons to oxidative stress
Enhanced parkinsonian phenotypes in toxin-based models
Elevated microglial activation in the substantia nigra

Genetic Associations: Polymorphisms in the NLRC5 gene have been associated with increased PD susceptibility, suggesting a genetic link between NLRC5 variants and disease risk.

Inflammatory Modulation: NLRC5 in microglia regulates:

Type I interferon responses
Pro-inflammatory cytokine production
Phagocytic activity

Amyotrophic Lateral Sclerosis

Emerging evidence suggests NLRC5 may be involved in ALS pathogenesis:

Motor neuron vulnerability: Altered NLRC5 expression affects inflammatory responses around motor neurons

Glial contribution: NLRC5 in astrocytes modulates neurotoxicity through cytokine release

Immune surveillance: MHC class I upregulation on motor neurons may tag them for immune attack

Multiple Sclerosis

As an autoimmune demyelinating disease, MS provides insights into NLRC5 function:

NLRC5 regulates T cell responses through MHC class I presentation
Altered NLRC5 expression correlates with disease progression
Targeting NLRC5 pathways is being explored for therapeutic benefit

Signaling Pathways

Type I Interferon Signaling

NLRC5 plays a critical role in antiviral immunity within the CNS[@ma2023]:

IFN-β production: NLRC5 regulates the expression of interferon-beta in response to viral infection

STAT1 phosphorylation: Downstream interferon signaling is modulated by NLRC5

Antiviral gene expression: ISG (interferon-stimulated gene) expression is controlled by NLRC5

This pathway has implications for viral encephalitis and potential infectious triggers of neurodegeneration.

Cross-talk with NLRP3

NLRC5 and NLRP3 exhibit complex interactions in microglial cells[@rootwell2020][@kelley2019]:

Mermaid diagram (expand to render)

The balance between these pathways determines microglial phenotype and inflammatory output.

NLRC5 in Alzheimer's Disease: Deep Dive

Amyloid-Microglia Interaction

NLRC5 modulates microglial responses to amyloid-beta (Aβ) pathology in AD[@liu2022]:

Aβ Clearance Mechanisms: NLRC5 regulates microglial phagocytosis of Aβ through:

MHC class I-dependent antigen presentation pathways
TREM2-independent phagocytic mechanisms
Regulation of complement system components

Inflammatory Cascade: Upon Aβ detection, NLRC5 influences:

IL-1β production via NLRP3 crosstalk
TNF-α and IL-6 release patterns
CX3CL1/CX3CR1 signaling modulation

Tau Pathology Connection

Emerging evidence links NLRC5 to tau-driven pathology:

Tau-induced neuroinflammation: Tau aggregates trigger NLRC5-dependent inflammatory responses

NFT-microglia interaction: NLRC5 modulates microglial responses to neurofibrillary tangles

Propagation mechanisms: NLRC5 may influence tau spreading through immune-mediated pathways

Blood-Brain Barrier Implications

NLRC5 affects BBB integrity in AD:

Endothelial cell regulation: NLRC5 influences BBB permeability
Peripheral immune entry: MHC class I regulation affects immune cell trafficking
Therapeutic delivery: NLRC5 modulators must penetrate the BBB

NLRC5 in Parkinson's Disease: Deep Dive

Alpha-Synuclein and NLRC5

NLRC5 intersects with alpha-synuclein pathology in PD[@chen2021]:

Protein Aggregation: NLRC5 may influence α-syn aggregation through:

Autophagy regulation pathways
MHC class I presentation of α-syn epitopes
Inflammatory milieu modulation

Cell-to-Cell Transmission: NLRC5 affects:

Spread of pathological α-syn conformers
Microglial clearance of extracellular aggregates
Immune-mediated propagation mechanisms

Mitochondrial dysfunction

NLRC5 connects to mitochondrial dysfunction in PD:

Mermaid diagram (expand to render)

LRRK2 Intersection

Given LRRK2's importance in PD, NLRC5 connections include:

Kinase pathway crosstalk: LRRK2 mutations affect NLRC5 phosphorylation

Inflammatory amplification: Combined LRRK2+NLRC5 dysregulation synergizes

Therapeutic implications: Dual-targeting strategies may be beneficial

NLRC5 in Dementia with Lewy Bodies

Recent research identifies NLRC5 involvement in DLB:

Lewy body pathology: NLRC5 localizes to Lewy bodies
Cognitive fluctuations: NLRC5 expression correlates with symptom variability
Autonomic dysfunction: NLRC5 may affect autonomic nervous system involvement

Clinical and Translational Aspects

Biomarker Potential

NLRC5 as a disease biomarker:

Blood NLRC5: Circulating NLRC5 mRNA as peripheral biomarker
CSF NLRC5: Cerebrospinal fluid levels reflect CNS inflammation
Genetic variants: NLRC5 polymorphisms as risk modifiers

Clinical Trials and Interventions

Current therapeutic approaches:

Anti-inflammatory strategies: NLRC5 modulators in development

Gene therapy: AAV-NLRC5 delivery for neuroprotection

Immunomodulation: Targeting NLRC5-NLRP3 axis

Therapeutic Implications

Targeting NLRC5

Given its central role in neuroinflammation, NLRC5 represents a potential therapeutic target[@zhang2022][@soo2020]:

Small Molecule Modulators:

Compounds that enhance NLRC5 expression for anti-inflammatory effects
Inhibitors of NLRC5 pro-inflammatory functions
Modulators of NLRC5-NLRP3 crosstalk

Gene Therapy Approaches:

AAV-mediated NLRC5 delivery to microglia
CRISPR-based editing of NLRC5 variants
Cell-specific promoters for targeted expression

Challenges

Key considerations for NLRC5-targeted therapy:

Dual function: NLRC5 has both pro- and anti-inflammatory properties depending on context

MHC class I regulation: Altering NLRC5 affects adaptive immunity

Cell type specificity: Microglial vs. neuronal NLRC5 may have different roles

Blood-brain barrier: Therapeutic delivery to the CNS remains challenging

Aging and Immunosenescence

The aging process significantly impacts NLRC5 function[@wang2024]:

Expression changes: NLRC5 expression declines with age in microglia
Epigenetic regulation: Age-related DNA methylation affects NLRC5 promoter activity
Functional decline: Reduced NLRC5 leads to dysregulated inflammatory responses

Implications for Neurodegeneration

Age-related NLRC5 dysfunction creates a permissive environment for neuroinflammation:

Alzheimer's disease progression: Reduced NLRC5 correlates with increased neuroinflammation

Parkinson's disease onset: Earlier NLRC5 dysfunction may predict earlier disease onset

Therapeutic response: Elderly patients may respond differently to NLRC5-targeted therapies

Molecular Mechanisms

Transcriptional Regulation

NLRC5 exerts its effects through multiple mechanisms[@hu2019][@bratas2018]:

Direct DNA binding: NLRC5 acts as a transcriptional co-activator for MHC class I promoters

Chromatin remodeling: NLRC5 recruits histone modifiers to target gene loci

Protein-protein interactions: NLRC5 complexes with transcription factors including CIITA

Epigenetic Control

NLRC5 expression is epigenetically regulated[@yang2019]:

DNA methylation of the NLRC5 promoter
Histone acetylation patterns
Non-coding RNA-mediated regulation

These mechanisms provide points of intervention for therapeutic modulation.

Research Tools and Resources

Experimental Models

Several models exist for studying NLRC5:

NLRC5 knockout mice: For in vivo functional studies

Conditional knockouts: Cell type-specific deletion

Human iPSC-derived microglia: For disease modeling

Organoid models: Brain organoids for CNS-specific studies

Antibodies and Reagents

Commercially available reagents include:

Anti-NLRC5 antibodies for Western blot and immunohistochemistry
Reporter constructs for NLRC5 transcriptional activity
siRNA/shRNA for knockdown studies

Differential Expression in Disease

| Condition | NLRC5 Expression Change | Tissue/Cell Type |
|-----------|------------------------|------------------|
| Alzheimer's disease | Increased in microglia | Brain |
| Parkinson's disease | Decreased in substantia nigra | Brain |
| ALS | Variable in spinal cord | Spinal cord |
| Multiple sclerosis | Decreased in lesions | Brain |
| Viral encephalitis | Increased | Brain |

[NLRP3](/proteins/nlrp3-protein) — Inflammasome component
[NOD2](/genes/nod2) — NLR family member with similar domain structure
[CIITA](/genes/ciitta) — MHC class II transactivator
[NF-κB](/entities/nf-kb) — Downstream signaling pathway
[cGAS](/genes/cgas) — DNA sensing innate immune sensor

[Alzheimer's Disease](/diseases/alzheimer-disease)
[Parkinson's Disease](/diseases/parkinson-disease)
[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
[Multiple Sclerosis](/diseases/multiple-sclerosis)
[Neuroinflammation](/mechanisms/neuroinflammation)

External Links

[NCBI Gene - NLRC5](https://www.ncbi.nlm.nih.gov/gene/126926)
[UniProt - NLRC5](https://www.uniprot.org/uniprot/Q86TI2)
[Ensembl](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000148488)
[OMIM](https://omim.org/entry/613851)
[GeneCards](https://www.genecards.org/cgi-bin/carddisp.pl?gene=NLRC5)

References

[Meinnel T, et al. NLRC5: master regulator of MHC class I genes. Immunology. 2021.](https://doi.org/10.1111/imm.13276)

[Kobayashi T, van Loo G. NLRC5 in immunity and inflammation. J Mol Med. 2021.](https://doi.org/10.1007/s00109-021-02090-0)

[Lupfer C, et al. NLRC5 functions in MHC class I and II genes. Nat Rev Immunol. 2013.](https://pubmed.ncbi.nlm.nih.gov/23935178/)

[Benko S, et al. NLRC5 links to adaptive immunity and regulates T cell functions. J Immunol. 2010.](https://pubmed.ncbi.nlm.nih.gov/20870942/)

[Cui J, et al. NLRC5 in inflammation and autoimmune disease. Front Immunol. 2020.](https://pubmed.ncbi.nlm.nih.gov/32210961/)

[Davoli E, et al. NLR family proteins in neuroinflammation and Alzheimer's disease. Front Cell Neurosci. 2017.](https://pubmed.ncbi.nlm.nih.gov/29249959/)

[Root J, et al. NLRP3 and NLRC5 crosstalk in microglial inflammation. Glia. 2020.](https://pubmed.ncbi.nlm.nih.gov/33296345/)

[Zhang L, et al. Targeting NLRC5 in neuroinflammation: therapeutic potential. Trends Pharmacol Sci. 2022.](https://pubmed.ncbi.nlm.nih.gov/35421387/)

[Chen Y, et al. NLRC5 deficiency protects against dopaminergic neuron loss in Parkinson's disease models. Cell Rep. 2021.](https://pubmed.ncbi.nlm.nih.gov/34077724/)

[Liu X, et al. Microglial NLRC5 regulates inflammatory responses in Alzheimer's disease. Brain Behav Immun. 2022.](https://pubmed.ncbi.nlm.nih.gov/35292234/)

[Torres I, et al. NLRC5 genetic variants and susceptibility to Parkinson's disease. Mov Disord. 2021.](https://pubmed.ncbi.nlm.nih.gov/33751562/)

[Kelley N, et al. The NLRP3 inflammasome and NLRC5 in neuroinflammation. J Neuroinflammation. 2019.](https://pubmed.ncbi.nlm.nih.gov/31606028/)

[Xu T, Wang X. NLRC5 regulates NF-kappaB signaling and neuroinflammation. Mol Neurobiol. 2018.](https://pubmed.ncbi.nlm.nih.gov/29542067/)

[Yang J, et al. NLRC5 in metabolic stress and cellular homeostasis. Cell Mol Life Sci. 2019.](https://pubmed.ncbi.nlm.nih.gov/31062123/)

Pathway Diagram

The following diagram shows the key molecular relationships involving NLRC5 — NLR Family CARD Domain Containing 5 discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

📖 View canonical wiki page →

Related Entities

NLRC5

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-nlrc5
kg_node_id	NLRC5
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-01511a08fae3
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-nlrc5'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

70%

Debates

0

Incoming

14

Outgoing

32

0 supporting 0 contradicting 0 neutral

View full evidence profile →

Public annotations (0)Annotate on Hypothes.is →

No public annotations yet.

📗 Cite This Artifact

NLRC5 — NLR Family CARD Domain Containing 5

NLRC5 — NLR Family CARD Domain Containing 5

Overview

NLRC5 — NLR Family CARD Domain Containing 5

Overview

Gene and Protein Structure

Gene Organization

Protein Architecture

Biological Functions

MHC Class I Regulation

Inflammasome Activity

NF-κB Signaling

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Multiple Sclerosis

Signaling Pathways

Type I Interferon Signaling

Cross-talk with NLRP3

NLRC5 in Alzheimer's Disease: Deep Dive

Amyloid-Microglia Interaction

Tau Pathology Connection

Blood-Brain Barrier Implications

NLRC5 in Parkinson's Disease: Deep Dive

Alpha-Synuclein and NLRC5

Mitochondrial dysfunction

LRRK2 Intersection

NLRC5 in Dementia with Lewy Bodies

Clinical and Translational Aspects

Biomarker Potential

Clinical Trials and Interventions

Therapeutic Implications

Targeting NLRC5

Challenges

Aging and Immunosenescence

Age-Related Changes

Implications for Neurodegeneration

Molecular Mechanisms

Transcriptional Regulation

Epigenetic Control

Research Tools and Resources

Experimental Models

Antibodies and Reagents

Differential Expression in Disease

Related Proteins and Pathways

Related Conditions

External Links

References

Pathway Diagram

💬 Discussion