Stats by Source
Total, split by cell line (COSMIC CL / DepMap / PubMed) vs tissue (COSMIC primary tissue)
Total = all mutations for this gene across every source.
Cell line = COSMIC Cell Lines Project + DepMap + PubMed.
Tissue = COSMIC primary-tissue (patient tumour) samples.
Total can exceed cell line + tissue: COSMIC tissue-derived models sit only in global, and a peptide can be shared across both.
| Total | Cell line | Tissue | |
|---|---|---|---|
| Mutations | 317 | 48 | 262 |
| Samples | 147 | 23 | 119 |
| Peptides | 109 | 12 | 93 |
Function
C4B · Complement C4B (Chido/Rodgers blood group)
This gene encodes the basic form of complement factor 4, and together with the C4A gene, is part of the classical activation pathway. The protein is expressed as a single chain precursor which is proteolytically cleaved into a trimer of alpha, beta, and gamma chains prior to secretion. The trimer provides a surface for interaction between the antigen-antibody complex and other complement components. The alpha chain may be cleaved to release C4 anaphylatoxin, a mediator of local inflammation. Deficiency of this protein is associated with systemic lupus erythematosus. This gene localizes to the major histocompatibility complex (MHC) class III region on chromosome 6. Varying haplotypes of this gene cluster exist, such that individuals may have 1, 2, or 3 copies of this gene. In addition, this gene exists as a long form and a short form due to the presence or absence of a 6.4 kb endogenous HERV-K retrovirus in intron 9. [provided by RefSeq, May 2020].
Isoforms & Proteins
2 transcripts · UniProt mapping is sequence-verified (AA-safe)
Each Ensembl transcript (ENST) this gene is mutated on, with its matched UniProt accession.
The mapping is sequence-verified: the UniProt sequence is identical to the transcript translation, so amino-acid positions line up exactly. A * marks an unreviewed (TrEMBL) entry.
Counts are mutations and unique mutant peptides on each transcript.
Gene Properties
Recurrent Mutations
All 109 amino-acid changes on canonical ENST00000435363 · needle height = samples · drag the mini-map to zoom
A lollipop / needle plot – the standard way to show recurrent mutations along a protein (as used by cBioPortal and MutationMapper).
X-axis = amino-acid position in the protein.
Needle height & head size = how often that exact amino-acid change was observed (its recurrence). Tall/large heads are mutational hotspots.
The most recurrent changes are labelled; hover any needle for the change, position and counts.
Mutation frequency across cancer types
% of samples with a missense/complex mutation in C4B · cell line vs tissue
For each cancer type, the fraction of samples that carry at least one missense/complex mutation anywhere in C4B – counted as distinct samples (a sample counts once no matter how many mutations it has).
Split into cell line and tissue; each cell shows mutated / total and the percentage. Cohorts with <20 samples are omitted. Ordered by combined frequency.
| Cancer type | Cell lines | Tissue samples |
|---|---|---|
| Thyroid Gland Carcinoma | 0/45 0% | 23/1592 1% |
| Melanoma | 0/210 0% | 26/1899 1% |
| Endometrial Carcinoma | 0/42 0% | 8/612 1% |
| Acute Myeloid Leukemia | 1/90 1% | 0/0 0% |
| Gastrointestinal Stromal Tumour | 0/0 0% | 1/133 1% |
| Gastric Carcinoma | 0/74 0% | 14/1809 1% |
| Non-Small Cell Lung Carcinoma | 7/304 2% | 5/1390 0% |
| Bladder Carcinoma | 1/58 2% | 6/956 1% |
| Squamous Cell Lung Carcinoma | 4/57 7% | 1/810 0% |
| Germ Cell Tumour | 1/25 4% | 0/169 0% |
| Osteosarcoma | 1/45 2% | 0/166 0% |
| Cervical Carcinoma | 0/35 0% | 2/422 0% |
| Mesothelioma | 1/62 2% | 0/165 0% |
| Burkitts Lymphoma | 1/32 3% | 0/196 0% |
| Other Sarcomas | 1/69 1% | 2/699 0% |
| Ovarian Carcinoma | 1/109 1% | 3/998 0% |
| Ewings Sarcoma | 1/63 2% | 0/262 0% |
| Colorectal Carcinoma | 1/143 1% | 9/3239 0% |
| Biliary Tract Carcinoma | 0/54 0% | 3/950 0% |
| Head and Neck Carcinoma | 0/85 0% | 4/1574 0% |
| Other Blood Cancers | 0/61 0% | 4/2725 0% |
| Glioma | 1/52 2% | 2/2127 0% |
| Neuroendocrine Tumour | 1/154 1% | 0/577 0% |
| Hepatocellular Carcinoma | 0/46 0% | 3/2210 0% |
| Esophageal Carcinoma | 0/23 0% | 1/769 0% |
| Other Solid Cancers | 0/94 0% | 2/1515 0% |
| Non-Cancerous | 0/104 0% | 1/830 0% |
| Breast Carcinoma | 0/144 0% | 2/3264 0% |
| Prostate Carcinoma | 0/13 0% | 1/2105 0% |
| Esophageal Squamous Cell Carcinoma | 0/51 0% | 1/2550 0% |
Mutation Distribution
Where C4B is mutated · all tissues, split by cell line vs tissue
How many mutations in C4B were found in each tissue, across the whole database.
Each bar is a tissue (cell-line and tissue names are merged to the standard tissue), split into cell line and tissue (patient tumour) contributions.
This shows the cancer-context where this gene is recurrently altered.
GTEx Expression
Median TPM across 54 healthy tissues
Median gene expression (TPM) in normal, non-cancer human tissues from the GTEx project.
Useful for judging tumour specificity – a strong neoantigen target ideally comes from a gene with low expression in healthy tissues.
Scroll or drag the mini-axis below the chart to browse all tissues.
Mutations
All 317 mutations in C4B
Every mutation record for this gene, across all samples and sources.
The Sample column links to the cell line (cell-line samples) or the tissue type (tissue samples).
Use the Type / Source filters, the search box, and column sorting to explore; each CAN-IMMUNE ID opens the full mutation & peptide view.
| ID | Sample | Transcript | AA Change | CDS | Type | Source | Mutant Peptide | Wild-type Peptide |
|---|