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 | 558 | 67 | 476 |
| Samples | 508 | 63 | 431 |
| Peptides | 377 | 53 | 330 |
Function
CHRNA4 · Cholinergic receptor nicotinic alpha 4 subunit
This gene encodes a nicotinic acetylcholine receptor, which belongs to a superfamily of ligand-gated ion channels that play a role in fast signal transmission at synapses. These pentameric receptors can bind acetylcholine, which causes an extensive change in conformation that leads to the opening of an ion-conducting channel across the plasma membrane. This protein is an integral membrane receptor subunit that can interact with either nAChR beta-2 or nAChR beta-4 to form a functional receptor. Mutations in this gene cause nocturnal frontal lobe epilepsy type 1. Polymorphisms in this gene that provide protection against nicotine addiction have been described. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2012].
Isoforms & Proteins
1 transcript · 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.
| Transcript | UniProt | Mutations | Peptides |
|---|---|---|---|
| ENST00000370263 | P43681 | 558 | 377 |
Gene Properties
Recurrent Mutations
All 377 amino-acid changes on canonical ENST00000370263 · 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 CHRNA4 · cell line vs tissue
For each cancer type, the fraction of samples that carry at least one missense/complex mutation anywhere in CHRNA4 – 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 |
|---|---|---|
| T-Lymphoblastic Leukemia | 4/40 10% | 0/0 0% |
| Chronic Myelogenous Leukemia | 1/25 4% | 0/0 0% |
| Oral Cavity Carcinoma | 2/54 4% | 0/0 0% |
| Melanoma | 8/210 4% | 60/1899 3% |
| Endometrial Carcinoma | 3/42 7% | 18/612 3% |
| Gastric Carcinoma | 2/74 3% | 49/1809 3% |
| Non-Small Cell Lung Carcinoma | 7/304 2% | 37/1390 3% |
| Other Solid Cancers | 3/94 3% | 37/1515 2% |
| Acute Myeloid Leukemia | 2/90 2% | 0/0 0% |
| Squamous Cell Lung Carcinoma | 1/57 2% | 16/810 2% |
| Colorectal Carcinoma | 6/143 4% | 57/3239 2% |
| Small Cell Lung Carcinoma | 0/9 0% | 9/752 1% |
| Neuroendocrine Tumour | 2/154 1% | 6/577 1% |
| Germ Cell Tumour | 0/25 0% | 2/169 1% |
| Hepatocellular Carcinoma | 1/46 2% | 20/2210 1% |
| Bladder Carcinoma | 0/58 0% | 9/956 1% |
| Glioma | 0/52 0% | 19/2127 1% |
| Plasma Cell Myeloma | 3/44 7% | 0/305 0% |
| Biliary Tract Carcinoma | 1/54 2% | 7/950 1% |
| Other Sarcomas | 3/69 4% | 3/699 0% |
| Hodgkins Lymphoma | 0/16 0% | 1/122 1% |
| Non-Cancerous | 0/104 0% | 6/830 1% |
| Esophageal Carcinoma | 0/23 0% | 5/769 1% |
| Esophageal Squamous Cell Carcinoma | 1/51 2% | 15/2550 1% |
| Breast Carcinoma | 2/144 1% | 17/3264 1% |
| Rhabdomyosarcoma | 0/33 0% | 1/171 1% |
| Head and Neck Carcinoma | 2/85 2% | 6/1574 0% |
| Osteosarcoma | 1/45 2% | 0/166 0% |
| Cervical Carcinoma | 0/35 0% | 2/422 0% |
| Burkitts Lymphoma | 0/32 0% | 1/196 1% |
Mutation Distribution
Where CHRNA4 is mutated · all tissues, split by cell line vs tissue
How many mutations in CHRNA4 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 558 mutations in CHRNA4
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 |
|---|