Entity Detail — Knowledge Graph Node
This page aggregates everything SciDEX knows about C4B: its mechanistic relationships (Knowledge Graph edges), hypotheses targeting it, analyses mentioning it, and supporting scientific papers. The interactive graph below shows its immediate neighbors. All content is AI-synthesized from peer-reviewed literature.
Complement component C4B gene - role in immune function, neuroinflammation, and connection to neurodegenerative and autoimmune diseases
| Gene Symbol | C4B |
| Full Name | Complement Component 4B (Chido/Rodgers Blood Group) |
| Aliases | Complement component C4B gene |
| Chromosome | 6p21.3 |
| Target Class | Protein |
| Function | encodes a crucial protein in the complement cascade, sharing significant sequence similarity with its close relative C4A while exhibiting distinct biochemical properties and disease associations. |
| Mechanism of Action | Prioritized from 1 SciDEX hypotheses, including: Age-Dependent Complement C4b Upregulation Drives Synaptic Vulnerability in Hippocampal CA1 Neurons |
| Druggability | Medium (0.50) |
| Clinical Stage | Phase I |
| Molecular Weight | 104 kDa |
| Amino Acids | 1741 aa |
| Pathways | Complement |
| UniProt ID | P0C0S0 |
| NCBI Gene ID | 713 |
| Ensembl ID | ENSG00000244731 |
| OMIM | 120820 |
| GeneCards | C4B |
| Human Protein Atlas | C4B |
| Associated Diseases | ALS, Aging, Alzheimer, neurodegeneration |
| Interactions | C1Q, C3, IFNAR1, TREM2, CD55, CD59 |
| SciDEX Target | View Target Profile |
| SciDEX Hypotheses | Age-Dependent Complement C4b Upregulation Drives S |
| KG Connections | 202 knowledge graph edges |
| Databases | GeneCardsHPASTRING |
Knowledge base pages for this entity
graph TD
C4B["<b>C4B</b>"]
Alzheimer{"Alzheimer"}
C4B -->|"associated with"| Alzheimer
Ms{"Ms"}
C4B -->|"expressed in"| Ms
Schizophrenia{"Schizophrenia"}
C4B -->|"expressed in"| Schizophrenia
Als{"Als"}
C4B -->|"expressed in"| Als
C4B -->|"associated with"| Als
Tumor{"Tumor"}
C4B -->|"regulates"| Tumor
Inflammation{"Inflammation"}
C4B -->|"expressed in"| Inflammation
ALS{"ALS"}
C4B -->|"expressed in"| ALS
Complement(["Complement"])
C4B -->|"expressed in"| Complement
JUN["JUN"]
C4B -->|"associated with"| JUN
TREM2["TREM2"]
C4B -->|"associated with"| TREM2
GENES["GENES"]
C4B -->|"expressed in"| GENES
JUN -->|"associated with"| C4B
TREM2 -->|"associated with"| C4B
C4A["C4A"]
C4A -->|"expressed in"| C4B
COMPLEMENT["COMPLEMENT"]
COMPLEMENT -->|"regulates"| C4B
CYTOKINES["CYTOKINES"]
CYTOKINES -->|"activates"| C4B
TNF["TNF"]
TNF -->|"expressed in"| C4B
INFLAMMATION["INFLAMMATION"]
INFLAMMATION -->|"expressed in"| C4B
IL_6["IL-6"]
IL_6 -->|"activates"| C4B
DISEASE_ASSOCIATED_MICROGLIA["DISEASE-ASSOCIATED MICROGLIA"]
DISEASE_ASSOCIATED_MICROGLIA -->|"associated with"| C4B
ALZHEIMER_S_DISEASE["ALZHEIMER'S DISEASE"]
ALZHEIMER_S_DISEASE -->|"associated with"| C4B
MICROGLIA["MICROGLIA"]
MICROGLIA -->|"associated with"| C4B
ALZHEIMER["ALZHEIMER"]
ALZHEIMER -->|"associated with"| C4B
style C4B fill:#1a3a4a,stroke:#4fc3f7,stroke-width:3px,color:#e0e0e0| Target | Relation | Type | Str |
|---|---|---|---|
| COMPLEMENT_CASCADE | component_of | pathway | 0.95 |
| SYNAPTIC_PRUNING | mediates | process | 0.90 |
| C1QA | pathway_partner | gene | 0.90 |
| C3 | activates | gene | 0.90 |
| SCHIZOPHRENIA | risk_gene_for | disease | 0.90 |
| ALZHEIMER'S DISEASE | upregulated_in | disease | 0.85 |
| HIPPOCAMPUS | upregulated_in | brain_region | 0.85 |
| AGING | increases_with | process | 0.85 |
| CD46 | regulated_by | protein | 0.80 |
| CD55 | regulated_by | protein | 0.80 |
| INTERFERON_GAMMA | induced_by | cytokine | 0.80 |
| MICROGLIA | activates_phagocytosis_by | cell_type | 0.80 |
| PRC2 | repressed_by | complex | 0.75 |
| TAU | pathology_linked_to | protein | 0.75 |
| SUTIMLIMAB | therapeutic_target_of | drug | 0.70 |
| neurodegeneration | associated_with | disease | 0.68 |
| Classical complement cascade | participates_in | pathway | 0.68 |
| Alzheimer | associated_with | disease | 0.65 |
| Ms | expressed_in | disease | 0.65 |
| Schizophrenia | expressed_in | disease | 0.65 |
| Als | expressed_in | disease | 0.65 |
| Als | associated_with | disease | 0.65 |
| Tumor | regulates | disease | 0.65 |
| Inflammation | expressed_in | disease | 0.65 |
| ALS | expressed_in | disease | 0.65 |
| Als | interacts_with | disease | 0.65 |
| Inflammation | activates | disease | 0.65 |
| Neuroinflammation | activates | disease | 0.65 |
| Ms | activates | disease | 0.65 |
| Neuropathy | activates | disease | 0.65 |
| Aging | associated_with | disease | 0.65 |
| Alzheimer | expressed_in | disease | 0.65 |
| Depression | activates | disease | 0.65 |
| ALS | associated_with | disease | 0.65 |
| Autoimmune | activates | disease | 0.65 |
| JUN | associated_with | gene | 0.60 |
| TREM2 | associated_with | gene | 0.60 |
| C4A | expressed_in | gene | 0.60 |
| C1Q | interacts_with | gene | 0.60 |
| ITGAM | biomarker_for | gene | 0.60 |
| C1QA | biomarker_for | gene | 0.60 |
| GFAP | expressed_in | gene | 0.60 |
| TREM2 | biomarker_for | gene | 0.60 |
| CYBB | biomarker_for | gene | 0.60 |
| AIF1 | biomarker_for | gene | 0.60 |
| TMEM119 | biomarker_for | gene | 0.60 |
| C1QB | biomarker_for | gene | 0.60 |
| IFNAR1 | activates | gene | 0.60 |
| CD68 | biomarker_for | gene | 0.60 |
| Presenilin | associated_with | protein | 0.60 |
| Source | Relation | Type | Str |
|---|---|---|---|
| h-2f43b42f | targets_gene | hypothesis | 0.90 |
| JUN | associated_with | gene | 0.60 |
| TREM2 | associated_with | gene | 0.60 |
| C4A | expressed_in | gene | 0.60 |
| TNF | expressed_in | gene | 0.60 |
| CR1 | interacts_with | gene | 0.60 |
| NMNAT2 | activates | gene | 0.60 |
| C1QB | biomarker_for | gene | 0.60 |
| TMEM119 | biomarker_for | gene | 0.60 |
| AIF1 | biomarker_for | gene | 0.60 |
| TYROBP | associated_with | gene | 0.60 |
| TREM2 | biomarker_for | gene | 0.60 |
| CD68 | biomarker_for | gene | 0.60 |
| CYBB | biomarker_for | gene | 0.60 |
| C1QC | biomarker_for | gene | 0.60 |
| IFNAR1 | activates | gene | 0.60 |
| ITGAM | biomarker_for | gene | 0.60 |
| C1QA | biomarker_for | gene | 0.60 |
| GFAP | expressed_in | gene | 0.60 |
| C4 | interacts_with | gene | 0.60 |
| C4A | interacts_with | gene | 0.60 |
| C1QA | activates | gene | 0.60 |
| COMPLEMENT | regulates | gene | 0.60 |
| CYTOKINES | activates | gene | 0.60 |
| INFLAMMATION | expressed_in | gene | 0.60 |
| IL-6 | activates | gene | 0.60 |
| DISEASE-ASSOCIATED MICROGLIA | associated_with | gene | 0.60 |
| ALZHEIMER'S DISEASE | associated_with | gene | 0.60 |
| MICROGLIA | associated_with | gene | 0.60 |
| ALZHEIMER | associated_with | gene | 0.60 |
| OLIGODENDROCYTE | associated_with | gene | 0.60 |
| COMPLEMENT | expressed_in | gene | 0.60 |
| GENES | expressed_in | gene | 0.60 |
| ASTROCYTE | associated_with | gene | 0.60 |
| SYNAPSE | expressed_in | gene | 0.60 |
| COMPLEMENT | inhibits | gene | 0.60 |
| AND | interacts_with | gene | 0.60 |
| SARM1 | activates | gene | 0.60 |
| NEUROINFLAMMATION | activates | gene | 0.60 |
| AXON | activates | gene | 0.60 |
| AND | activates | gene | 0.60 |
| NEURODEGENERATIVE DISEASES | activates | gene | 0.60 |
| RNA | associated_with | gene | 0.60 |
| AND | associated_with | gene | 0.60 |
| IRF8 | associated_with | gene | 0.60 |
| AND | expressed_in | gene | 0.60 |
| PHAGOCYTOSIS | associated_with | gene | 0.60 |
| COMPLEMENT | biomarker_for | gene | 0.60 |
| MICROGLIA | biomarker_for | gene | 0.60 |
| ASTROCYTE | expressed_in | gene | 0.60 |
Hypotheses where this entity is a therapeutic target
| Hypothesis | Score | Disease | Analysis |
|---|---|---|---|
| Age-Dependent Complement C4b Upregulation Drives Synaptic Vu | 0.470 | neurodegeneration | Gene expression changes in aging mouse b |
Scientific analyses that reference this entity
neurodegeneration | 2026-04-03 | 34 hypotheses Top: 0.692
Scientific publications cited in analyses involving this entity
| Title & PMID | Authors | Journal | Year | Citations |
|---|---|---|---|---|
| Human and mouse single-nucleus transcriptomics reveal TREM2-dependent and TREM2- [PMID:31932797] | Zhou Y, Song WM, Andhey PS, Swain A, Lev | Nat Med | 2020 | 1 |
| Repurposing of doxycycline as a novel therapeutic avenue for management of parki [PMID:41925933] | Ali NH, Al-Kuraishy HM, Hussain NR, Al-G | Inflammopharmacology | 2026 | 0 |
| Histological findings in follow-up liver biopsies up to 15 years after pediatric [PMID:41370831] | Quintero-Bernabeu J, Salcedo-Allende MT, | Liver Transpl | 2026 | 0 |
| Protein Corona Reprograms Hepatic Clearance Pathways of Biomimetic Nanoparticles [PMID:41944292] | He T, Fang X, Zhu L, Fan H, Qiu Y et al. | Small | 2026 | 0 |
| Mid-Term Comparison of N-Butyl Cyanoacrylate, Endovenous Laser Ablation, and Rad [PMID:41964281] | Dilek I, Kocaoglu AS, Büyükceran EU, Nay | Vasc Endovascular Surg | 2026 | 0 |
| Knee Osteoarthritis as a Causal Risk Factor for Parkinson's Disease: Converging [PMID:41925436] | Peng Z, Wang G | The American journal of geriat | 2026 | 0 |
| Reactive astrocyte subpopulations with high Gfap and C4b expression in different [PMID:41837502] | Huang C, Han Y, He J, Ma W, Chen Y, Dong | Neural regeneration research | 2026 | 0 |
| Longitudinal investigation of the T helper (Th)1-Th2 balance and complement syst [PMID:41872173] | Zhang T, Zhao J, Tang X, Wei Y, Ju M, Zh | Translational psychiatry | 2026 | 0 |
| Global C3 lowering in adulthood protects against hippocampal dysfunction and cog [PMID:40678242] | ["Batista A", "Presumey J", "Singh B", " | Research square | 2025 | 0 |
| Diverse cell types establish a pathogenic immune environment in peripheral neuro [PMID:40410792] | ["Choi J", "Strickland A", "Loo H", "Don | Journal of neuroinflammation | 2025 | 0 |
| Alzheimer's disease clinical variants show distinct neuroinflammatory profiles w [PMID:39400356] | ["Boon B", "Frigerio I", "de Gooijer D", | Neuropathology and applied neu | 2024 | 0 |
| TREM2 receptor protects against complement-mediated synaptic loss by binding to [PMID:37442133] | Zhong L, Sheng X, Wang W, Li Y, Zhuo R, | Immunity | 2023 | 0 |
| [WALANT - Wide Awake Local Anaesthesia No Tourniquet: Complications in elective [PMID:35168268] | Wieschollek S, Forster S, Megerle K | Handchirurgie, Mikrochirurgie, | 2022 | 0 |
| Loss of microglial SIRPα promotes synaptic pruning in preclinical models of neur [PMID:33795678] | Ding X, Wang J, Huang M, Chen Z, Liu J, | Nature communications | 2021 | 0 |
| Adaptive learning algorithms to optimize mobile applications for behavioral heal [PMID:33657217] | Figueroa CA, Aguilera A, Chakraborty B, | Journal of the American Medica | 2021 | 0 |
| Engineering complex communities by directed evolution. [PMID:33986540] | Chang CY, Vila JCC, Bender M, Li R, Mank | Nature ecology & evolution | 2021 | 0 |
| A Novel N-terminal Region to Chromodomain in CHD7 is Required for the Efficient [PMID:34161779] | Lee E, Kang C, Purhonen P, Hebert H, Bou | Journal of molecular biology | 2021 | 0 |
| A distributional code for value in dopamine-based reinforcement learning. [PMID:31942076] | Dabney W, Kurth-Nelson Z, Uchida N, Star | Nature | 2020 | 0 |
| PDK1 Mediates NOTCH1-Mutated Head and Neck Squamous Carcinoma Vulnerability to T [PMID:30770351] | Sambandam V, Frederick MJ, Shen L, Tong | Clinical cancer research : an | 2019 | 0 |
| TREM2 triggers microglial density and age-related neuronal loss. [PMID:30548312] | Linnartz-Gerlach B, Bodea LG, Klaus C, G | Glia | 2019 | 0 |