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 | 440 | 36 | 396 |
| Samples | 123 | 17 | 104 |
| Peptides | 111 | 16 | 97 |
Function
CD8A · CD8 subunit alpha
The CD8 antigen is a cell surface glycoprotein found on most cytotoxic T lymphocytes that mediates efficient cell-cell interactions within the immune system. The CD8 antigen acts as a coreceptor with the T-cell receptor on the T lymphocyte to recognize antigens displayed by an antigen presenting cell in the context of class I MHC molecules. The coreceptor functions as either a homodimer composed of two alpha chains or as a heterodimer composed of one alpha and one beta chain. Both alpha and beta chains share significant homology to immunoglobulin variable light chains. This gene encodes the CD8 alpha chain. Multiple transcript variants encoding different isoforms have been found for this gene. The major protein isoforms of this gene differ by the presence or absence of a transmembrane domain and thus differ in being a membrane-anchored or secreted protein. [provided by RefSeq, May 2020].
Isoforms & Proteins
4 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 93 amino-acid changes on canonical ENST00000283635 · 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 CD8A · cell line vs tissue
For each cancer type, the fraction of samples that carry at least one missense/complex mutation anywhere in CD8A – 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 | 2/40 5% | 0/0 0% |
| Glioblastoma | 1/98 1% | 0/0 0% |
| Endometrial Carcinoma | 2/42 5% | 3/612 0% |
| Hodgkins Lymphoma | 0/16 0% | 1/122 1% |
| Gastric Carcinoma | 0/74 0% | 12/1809 1% |
| Esophageal Squamous Cell Carcinoma | 2/51 4% | 14/2550 1% |
| Esophageal Carcinoma | 0/23 0% | 4/769 1% |
| Colorectal Carcinoma | 2/143 1% | 14/3239 0% |
| Melanoma | 1/210 0% | 9/1899 0% |
| Non-Small Cell Lung Carcinoma | 3/304 1% | 5/1390 0% |
| Cervical Carcinoma | 0/35 0% | 2/422 0% |
| Biliary Tract Carcinoma | 0/54 0% | 4/950 0% |
| Ovarian Carcinoma | 0/109 0% | 4/998 0% |
| Plasma Cell Myeloma | 1/44 2% | 0/305 0% |
| Neuroendocrine Tumour | 1/154 1% | 1/577 0% |
| Squamous Cell Lung Carcinoma | 0/57 0% | 2/810 0% |
| Glioma | 0/52 0% | 5/2127 0% |
| Bladder Carcinoma | 0/58 0% | 2/956 0% |
| Other Solid Cancers | 1/94 1% | 2/1515 0% |
| Head and Neck Carcinoma | 0/85 0% | 3/1574 0% |
| Thyroid Gland Carcinoma | 1/45 2% | 2/1592 0% |
| Prostate Carcinoma | 0/13 0% | 3/2105 0% |
| Hepatocellular Carcinoma | 0/46 0% | 3/2210 0% |
| Other Sarcomas | 0/69 0% | 1/699 0% |
| Small Cell Lung Carcinoma | 0/9 0% | 1/752 0% |
| Non-Cancerous | 0/104 0% | 1/830 0% |
| Breast Carcinoma | 0/144 0% | 3/3264 0% |
| B-Cell Non-Hodgkins Lymphoma | 0/88 0% | 2/2534 0% |
| Other Blood Cancers | 0/61 0% | 2/2725 0% |
| Kidney Carcinoma | 0/85 0% | 1/1862 0% |
Mutation Distribution
Where CD8A is mutated · all tissues, split by cell line vs tissue
How many mutations in CD8A 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 440 mutations in CD8A
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 |
|---|