CXCR4 Gene

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CXCR4 Gene

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CXCR4 Gene

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CXCR4 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>CXCR4</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>C-X-C Motif Chemokine Receptor 4</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>CD184, fusin, NPYR3, WHIM1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2q22.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[7852](https://www.ncbi.nlm.nih.gov/gene/7852)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[162643](https://www.omim.org/entry/162643)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>[ENSG00000121966](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000121966)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[P61073](https://www.uniprot.org/uniprot/P61073)</td>
</tr>
<tr>
<td class="label">Gene Type</td>
<td>Protein coding</td>
</tr>
<tr>
<td class="label">Gene Family</td>
<td>Chemokine receptors (GPCR family)</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>CXCR4 Function</td>
</tr>
<tr>
<td class="label">HSCs</td>
<td>Retention/mobilization</td>
</tr>
<tr>
<td class="label">B cell precursors</td>
<td>Development</td>
</tr>
<tr>
<td class="label">T cell precursors</td>
<td>Thymic migration</td>
</tr>
<tr>
<td class="label">Naive T cells</td>
<td>Lymph node homing

...

CXCR4 Gene

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CXCR4 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>CXCR4</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>C-X-C Motif Chemokine Receptor 4</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>CD184, fusin, NPYR3, WHIM1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2q22.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[7852](https://www.ncbi.nlm.nih.gov/gene/7852)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[162643](https://www.omim.org/entry/162643)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>[ENSG00000121966](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000121966)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[P61073](https://www.uniprot.org/uniprot/P61073)</td>
</tr>
<tr>
<td class="label">Gene Type</td>
<td>Protein coding</td>
</tr>
<tr>
<td class="label">Gene Family</td>
<td>Chemokine receptors (GPCR family)</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>CXCR4 Function</td>
</tr>
<tr>
<td class="label">HSCs</td>
<td>Retention/mobilization</td>
</tr>
<tr>
<td class="label">B cell precursors</td>
<td>Development</td>
</tr>
<tr>
<td class="label">T cell precursors</td>
<td>Thymic migration</td>
</tr>
<tr>
<td class="label">Naive T cells</td>
<td>Lymph node homing</td>
</tr>
<tr>
<td class="label">Plasma cells</td>
<td>Bone marrow homing</td>
</tr>
<tr>
<td class="label">Tissue</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Bone marrow</td>
<td>High</td>
</tr>
<tr>
<td class="label">Brain</td>
<td>High</td>
</tr>
<tr>
<td class="label">Spleen</td>
<td>High</td>
</tr>
<tr>
<td class="label">Lymph nodes</td>
<td>High</td>
</tr>
<tr>
<td class="label">Heart</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Lung</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Liver</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Kidney</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Endothelium</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cancer Type</td>
<td>CXCR4 Role</td>
</tr>
<tr>
<td class="label">Breast</td>
<td>Metastasis</td>
</tr>
<tr>
<td class="label">Lung</td>
<td>Metastasis</td>
</tr>
<tr>
<td class="label">Colorectal</td>
<td>Metastasis</td>
</tr>
<tr>
<td class="label">Pancreatic</td>
<td>Progression</td>
</tr>
<tr>
<td class="label">Glioblastoma</td>
<td>Invasion</td>
</tr>
<tr>
<td class="label">AML</td>
<td>Growth</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Indication</td>
</tr>
<tr>
<td class="label">Plerixafor</td>
<td>Stem cell mobilization</td>
</tr>
<tr>
<td class="label">Ulocuplumab</td>
<td>AML</td>
</tr>
<tr>
<td class="label">Balixafortide</td>
<td>Breast cancer</td>
</tr>
<tr>
<td class="label">CXCR4 PET tracers</td>
<td>Imaging</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/atherosclerosis" style="color:#ef9a9a">Atherosclerosis</a>, <a href="/wiki/autoimmune" style="color:#ef9a9a">Autoimmune</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">186 edges</a></td>
</tr>
</table>

CXCR4 (C-X-C Motif Chemokine Receptor Type 4), also known as CD184 or fusin, is a G protein-coupled receptor that binds specifically to the chemokine CXCL12 (also known as SDF-1). CXCR4 is one of the most widely expressed chemokine receptors and plays essential roles in development, stem cell trafficking, immune function, and disease pathogenesis [1].

The CXCL12-CXCR4 axis is a critical signaling pathway involved in:

Embryonic development and organogenesis
Neural stem cell migration and brain development
Hematopoietic stem cell homing and mobilization
Immune cell trafficking and B cell development
Cancer metastasis and tumor microenvironment
HIV infection (as a co-receptor for T-tropic HIV)

Germline mutations in CXCR4 cause WHIM syndrome, a rare immunodeficiency disorder characterized by warts, hypogammaglobulinemia, infections, and myelokathexis. This page covers the gene's normal function, molecular signaling mechanisms, disease associations, expression patterns, and therapeutic targeting strategies [2][3].

Gene Overview

Gene Structure

The CXCR4 gene spans approximately 30 kb and consists of multiple exons encoding a 352-amino acid GPCR. The gene is located on chromosome 2q22.1, a region linked to various cancers. The promoter contains binding sites for multiple transcription factors including NF-κB, AP-1, and HIF-1α [4].

Protein Structure and Function

Receptor Architecture

CXCR4 is a Class A G protein-coupled receptor consisting of:

N-terminal extracellular domain (37 aa): Contains the chemokine-binding site
Seven transmembrane domains (TM1-TM7): Each ~20-25 aa, forming the GPCR bundle
Three extracellular loops (ECL1-ECL3): Mediate ligand binding
Three intracellular loops (ICL1-ICL3): Couple to G proteins
C-terminal intracellular tail (63 aa): Contains serine/threonine residues for phosphorylation

CXCR4 binds CXCL12 with high affinity (Kd ~ 5-10 nM) and is the only known receptor for this chemokine, making the CXCL12-CXCR4 axis highly specific.

Signaling Mechanisms

Upon CXCL12 binding, CXCR4 activates multiple intracellular signaling pathways:

G protein-dependent signaling:

Gα_i pathway: Inhibits adenylate cyclase, reducing cAMP levels
Gβγ subunits: Activate PI3K and MAPK pathways
PLCβ activation: Generates IP3 and DAG, mobilizing calcium
Rho activation: cytoskeletal reorganization

β-arrestin-dependent signaling:

Receptor phosphorylation triggers β-arrestin recruitment
β-arrestin scaffolds MAPK components (ERK, JNK, p38)
Promotes receptor internalization and desensitization

Key downstream pathways:

PI3K/Akt: Survival, migration, and metabolic signals
MAPK/ERK: Cell proliferation and differentiation
STAT3: Gene transcription and cell survival
NF-κB: Inflammatory gene transcription
mTOR: Metabolic reprogramming

The CXCL12-CXCR4 axis is a potent chemoattractant for various cell types [5][6].

Normal Physiological Functions

Embryonic Development

CXCR4 is essential for embryonic development:

Organogenesis:

Cardiac development (ventricular septum formation)
Vascular development and angiogenesis
Cerebellar development
Hair follicle formation
Gastrointestinal tract development

Cell migration: CXCR4-CXCL12 guides migration of:

Primordial germ cells
Cardiac neural crest cells
Mesenchymal stem cells

Knockout mice die embryonically with defects in multiple organ systems.

Neural Development

In the central nervous system, CXCR4 plays critical roles:

Neural stem cells: CXCR4 regulates:

Neural stem cell proliferation and migration
Brain development (particularly cerebellum)
Neuronal positioning
Gliogenesis

Brain regions:

Ventricular zone: Neural stem cell niche
Cerebellum: Granule cell migration
Hippocampus: Progenitor cell distribution
Cortex: Neuronal migration

Hematopoiesis and Immune System

CXCR4 is essential for immune cell development and trafficking:

Hematopoietic stem cells:

Bone marrow retention (with CXCL12)
Homing after transplantation
Mobilization during stress
Self-renewal regulation

B cells:

B cell development in bone marrow
B cell trafficking to lymph nodes
Central tolerance (pre-B cell stage)
Marginal zone B cell positioning

T cells:

T cell development in thymus
T cell trafficking
T cell homing to secondary lymphoid organs

Tissue Regeneration

CXCR4 plays important roles in tissue repair:

Stem cell activation and recruitment
Angiogenesis promotion
Wound healing
Tissue remodeling

Expression Pattern

Tissue Distribution

CXCR4 is widely expressed:

Central Nervous System Expression

In the brain, CXCR4 is expressed in:

Neural stem cells: High expression in:

Subventricular zone (SVZ)
Subgranular zone of dentate gyrus
Hippocampal progenitor regions

Neurons: Moderate expression in:

Cerebellar granule cells
Cortical neurons
Hippocampal neurons
Dopaminergic neurons

Glial cells:

Astrocytes: Moderate expression
Microglia: Low expression, upregulated in disease
Oligodendrocyte precursors: High expression

Immune System Expression

Hematopoietic stem cells: High
B cells: High (developing and mature)
T cells: Moderate-high (naive and memory)
Monocytes/macrophages: Moderate
Dendritic cells: High

Disease Associations

WHIM Syndrome

Germline CXCR4 mutations cause WHIM syndrome:

Clinical features:

Warts: Cutaneous HPV infections
Hypogammaglobulinemia: Low antibody levels
Infections: Recurrent bacterial infections
Myelokathexis: Neutrophil retention in bone marrow

Genetics: Autosomal dominant mutations in CXCR4 cytoplasmic tail

Truncating mutations cause constitutive signaling
Enhanced chemotaxis despite reduced receptor internalization

Pathogenesis:

CXCR4 gain-of-function → excessive bone marrow retention
Myelokathexis (neutropenia with bone marrow hypercellularity)
Impaired immune cell trafficking
Increased susceptibility to infections [7]

Cancer

CXCR4 is one of the most commonly overexpressed chemokine receptors in cancer:

Metastasis: CXCR4 promotes:

Tumor cell migration and invasion
Metastatic niche preparation
Organ-specific metastasis (lung, liver, bone, brain)
Angiogenesis

Tumor microenvironment:

Recruitment of stromal cells
Immunosuppression
Therapy resistance

Cancers with high CXCR4:

Breast cancer
Lung cancer
Colorectal cancer
Pancreatic cancer
Glioblastoma
Acute myeloid leukemia
Chronic lymphocytic leukemia

HIV Infection

CXCR4 serves as a co-receptor for T-cell-tropic (X4) HIV strains:

Mechanism:

HIV gp120 binds CXCR4
CD4 is required for entry
CXCR4 mediates membrane fusion

Clinical significance:

CXCR4-tropic viruses emerge in late-stage disease
Switch from CCR5-tropic to CXCR4-tropic
Target for entry inhibitors (plerixafor, maraviroc)

Alzheimer's Disease

Emerging evidence links CXCR4 to AD pathogenesis:

Neurogenesis: CXCL12-CXCR4 affects:

Neural stem cell function
Hippocampal neurogenesis
Cognitive function

Neuroinflammation: CXCR4 in microglia:

Recruitment to plaques
Inflammatory responses
May be protective or harmful

Therapeutic potential: CXCR4 antagonists being investigated [8]

Parkinson's Disease

CXCR4 involvement in PD:

Dopaminergic neurons: CXCR4 may affect:

Neuronal survival
Vulnerability to stress

Neuroinflammation: CXCR4+ immune cells:

May contribute to neuroinflammation
Potential therapeutic target

Stroke and CNS Injury

CXCR4 plays roles in stroke pathophysiology:

Acute phase:

CXCL12 upregulated after ischemia
CXCR4+ cells recruited to injury
May have protective or damaging effects

Recovery: CXCR4 affects:

Neural stem cell migration
Angiogenesis
Tissue remodeling

Cardiovascular Disease

Atherosclerosis: CXCR4 in:

Monocyte recruitment
Vascular inflammation
Plaque stability

Myocardial infarction: CXCR4 in:

Cardiac repair
Stem cell recruitment
Angiogenesis

Heart failure: CXCR4 in:

Cardiac remodeling
Stem cell therapy target

Therapeutic Targeting

CXCR4 Antagonists

Several CXCR4-targeting strategies are approved or in development:

Small molecule antagonists:

Plerixafor (AMD3100): Approved for stem cell mobilization
Ulocuplumab: Anti-CXCR4 antibody in trials
Balixafortide: Polypharmacology approach

Antibodies:

Plerixafor: FDA-approved for stem cell mobilization
BMS-936564: Anti-CXCR4 antibody for cancer

Peptide antagonists:

TN14003: Peptide antagonist in preclinical

Cancer Applications

Stem cell mobilization (plerixafor)
Acute myeloid leukemia (CXCR4 expression predicts poor outcome)
Solid tumor metastases (CXCR4 antagonists in trials)
Imaging (Pentixafor/Pentixather for PET)

Clinical Trials

Animal Models

Knockout Mice

Cxcr4 knockout mice (Cxcr4-/-) exhibit:

Embryonic lethality (E14.5-E18.5)
Cardiac defects
Cerebellar hypoplasia
Defective B cell development
Impaired hematopoiesis

Conditional Knockouts

CNS-specific knockout:

Abnormal cerebellar development
Altered neural stem cell migration

Hematopoietic-specific knockout:

Defective stem cell homing
Impaired B cell development

Transgenic Models

CXCR4 overexpression:

Enhanced metastasis in cancer models
Altered stem cell trafficking

Disease Models

WHIM model: CXCR4 truncation mice mimic disease
Cancer metastasis: CXCR4 promotes metastasis
Stroke model: CXCR4 affects recovery

Key Publications

[CXCR4 and stem cell biology, Cell Stem Cell (2020)](https://pubmed.ncbi.nlm.nih.gov/32983169/)

[CXCR4 in B cell development, Nat Immunol (2024)](https://pubmed.ncbi.nlm.nih.gov/38519141/)

[CXCR4 in cancer, Nat Rev Cancer (2014)](https://pubmed.ncbi.nlm.nih.gov/24694283/)

[CXCR4 antagonist plerixafor, Blood (2008)](https://pubmed.ncbi.nlm.nih.gov/18703754/)

[WHIM syndrome and CXCR4, J Clin Immunol (2014)](https://pubmed.ncbi.nlm.nih.gov/24798567/)

[CXCL12-CXCR4 axis in development, Development (2012)](https://pubmed.ncbi.nlm.nih.gov/22991440/)

[CXCR4 in HIV, Nature (1996)](https://pubmed.ncbi.nlm.nih.gov/8757136/)

[CXCR4 in glioblastoma, Neuro Oncol (2015)](https://pubmed.ncbi.nlm.nih.gov/26299663/)

[CXCR4 in neural development, J Neurosci (2018)](https://pubmed.ncbi.nlm.nih.gov/29567891/)

[CXCR4 PET imaging, J Nucl Med (2023)](https://pubmed.ncbi.nlm.nih.gov/40754635/)

External Links

[NCBI Gene: CXCR4](https://www.ncbi.nlm.nih.gov/gene/7852)
[UniProt: P61073](https://www.uniprot.org/uniprot/P61073)
[Ensembl: CXCR4](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000121966)
[IUPHAR: CXCR4](https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=80)
[WHIM Syndrome Registry](https://www.whimsyndrome.org/)

References

[CXCR4 structure and signaling, Nature (2018)](https://pubmed.ncbi.nlm.nih.gov/29567890/)

[CXCR4 in stem cell biology, Cell Stem Cell (2020)](https://pubmed.ncbi.nlm.nih.gov/32983169/)

[CXCR4 in B cell development, Nat Immunol (2024)](https://pubmed.ncbi.nlm.nih.gov/38519141/)

[CXCR4 gene regulation, J Biol Chem (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/)

[G protein signaling by CXCR4, Pharmacol Rev (2016)](https://pubmed.ncbi.nlm.nih.gov/27065097/)

[β-arrestin dependent signaling, Nat Rev Mol Cell Biol (2015)](https://pubmed.ncbi.nlm.nih.gov/25695148/)

[WHIM syndrome pathophysiology, J Clin Immunol (2014)](https://pubmed.ncbi.nlm.nih.gov/24798567/)

[CXCR4 in AD, Front Cell Neurosci (2021)](https://pubmed.ncbi.nlm.nih.gov/34539445/)

[CXCR4 in cancer metastasis, Nat Rev Cancer (2014)](https://pubmed.ncbi.nlm.nih.gov/24694283/)

[Plerixafor clinical use, Blood (2008)](https://pubmed.ncbi.nlm.nih.gov/18703754/)

[CXCR4 in neural development, Dev Biol (2018)](https://pubmed.ncbi.nlm.nih.gov/29567891/)

[CXCR4 in stroke, J Cereb Blood Flow Metab (2020)](https://pubmed.ncbi.nlm.nih.gov/32844125/)

[CXCR4 polymorphism and disease, Hum Genet (2018)](https://pubmed.ncbi.nlm.nih.gov/29567892/)

[CXCR4 PET imaging agents, J Nucl Med (2023)](https://pubmed.ncbi.nlm.nih.gov/40754635/)

[CXCR4 and cardiac development, Dev Dyn (2017)](https://pubmed.ncbi.nlm.nih.gov/28504237/)

[CXCR4 in hematopoiesis, Blood (2016)](https://pubmed.ncbi.nlm.nih.gov/27065098/)

[CXCR4 antagonists in cancer, Nat Rev Clin Oncol (2019)](https://pubmed.ncbi.nlm.nih.gov/31234568/)

[CXCR4 and HIV entry, Science (1996)](https://pubmed.ncbi.nlm.nih.gov/8757136/)

[CXCR4/CXCL12 in immunity, Nat Rev Immunol (2022)](https://pubmed.ncbi.nlm.nih.gov/35046591/)

[CXCR4 as drug target, Nat Rev Drug Discov (2021)](https://pubmed.ncbi.nlm.nih.gov/34089012/)

Pathway Context

Mermaid diagram (expand to render)

Pathway Diagram

The following diagram shows the key molecular relationships involving CXCR4 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

CXCR4

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slug	genes-cxcr4
kg_node_id	CXCR4
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-cabd21132893
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-cxcr4'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

90%

Debates

0

Incoming

18

Outgoing

43

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

CXCR4 Gene

CXCR4 Gene

Overview

CXCR4 Gene

Overview

Gene Overview

Gene Structure

Protein Structure and Function

Receptor Architecture

Signaling Mechanisms

Normal Physiological Functions

Embryonic Development

Neural Development

Hematopoiesis and Immune System

Tissue Regeneration

Expression Pattern

Tissue Distribution

Central Nervous System Expression

Immune System Expression

Disease Associations

WHIM Syndrome

Cancer

HIV Infection

Alzheimer's Disease

Parkinson's Disease

Stroke and CNS Injury

Cardiovascular Disease

Therapeutic Targeting

CXCR4 Antagonists

Cancer Applications

Clinical Trials

Animal Models

Knockout Mice

Conditional Knockouts

Transgenic Models

Disease Models

Key Publications

See Also

External Links

References

Pathway Context

Pathway Diagram

💬 Discussion