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 | 610 | 47 | 557 |
| Samples | 112 | 15 | 95 |
| Peptides | 120 | 21 | 102 |
Function
TK2 · Thymidine kinase 2
This gene encodes a deoxyribonucleoside kinase that specifically phosphorylates thymidine, deoxycytidine, and deoxyuridine. The encoded enzyme localizes to the mitochondria and is required for mitochondrial DNA synthesis. Mutations in this gene are associated with a myopathic form of mitochondrial DNA depletion syndrome. Alternate splicing results in multiple transcript variants encoding distinct isoforms, some of which lack transit peptide, so are not localized to mitochondria. [provided by RefSeq, Dec 2012].
Isoforms & Proteins
11 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.
| Transcript | UniProt | Mutations | Peptides |
|---|---|---|---|
| ENST00000544898 | O00142 | 128 | 81 |
| ENST00000564917 | H3BP77* | 103 | 61 |
| ENST00000545043 | O00142-3 | 95 | 55 |
| ENST00000451102 | O00142-2 | 75 | 42 |
| ENST00000417693 | O00142-4 | 47 | 38 |
| ENST00000525974 | O00142-5 | 43 | 33 |
| ENST00000527800 | O00142-5 | 43 | 33 |
| ENST00000563369 | O00142-5 | 43 | 33 |
| ENST00000620035 | A0A7P0SB82* | 23 | 15 |
| ENST00000527284 | A0A7P0PE46* | 6 | 5 |
| ENST00000299697 | A0A7P0MLU2* | 4 | 4 |
Gene Properties
Recurrent Mutations
All 81 amino-acid changes on canonical ENST00000544898 · 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 TK2 · cell line vs tissue
For each cancer type, the fraction of samples that carry at least one missense/complex mutation anywhere in TK2 – 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% |
| Chronic Myelogenous Leukemia | 1/25 4% | 0/0 0% |
| T-Cell Non-Hodgkins Lymphoma | 1/26 4% | 0/0 0% |
| Other Solid Cancers | 1/94 1% | 26/1515 2% |
| Endometrial Carcinoma | 0/42 0% | 9/612 1% |
| Esophageal Carcinoma | 0/23 0% | 5/769 1% |
| Melanoma | 2/210 1% | 11/1899 1% |
| Gastric Carcinoma | 0/74 0% | 7/1809 0% |
| Ewings Sarcoma | 0/63 0% | 1/262 0% |
| Bladder Carcinoma | 0/58 0% | 3/956 0% |
| Non-Small Cell Lung Carcinoma | 1/304 0% | 4/1390 0% |
| Plasma Cell Myeloma | 1/44 2% | 0/305 0% |
| Neuroendocrine Tumour | 2/154 1% | 0/577 0% |
| Colorectal Carcinoma | 2/143 1% | 7/3239 0% |
| Small Cell Lung Carcinoma | 0/9 0% | 2/752 0% |
| Cervical Carcinoma | 0/35 0% | 1/422 0% |
| Non-Cancerous | 0/104 0% | 2/830 0% |
| Head and Neck Carcinoma | 0/85 0% | 3/1574 0% |
| Thyroid Gland Carcinoma | 0/45 0% | 3/1592 0% |
| Esophageal Squamous Cell Carcinoma | 1/51 2% | 3/2550 0% |
| Other Sarcomas | 0/69 0% | 1/699 0% |
| Squamous Cell Lung Carcinoma | 0/57 0% | 1/810 0% |
| Kidney Carcinoma | 0/85 0% | 2/1862 0% |
| Biliary Tract Carcinoma | 0/54 0% | 1/950 0% |
| Hepatocellular Carcinoma | 0/46 0% | 2/2210 0% |
| Ovarian Carcinoma | 0/109 0% | 1/998 0% |
| Glioma | 0/52 0% | 1/2127 0% |
| B-Cell Non-Hodgkins Lymphoma | 1/88 1% | 0/2534 0% |
| Breast Carcinoma | 0/144 0% | 1/3264 0% |
Mutation Distribution
Where TK2 is mutated · all tissues, split by cell line vs tissue
How many mutations in TK2 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 610 mutations in TK2
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 |
|---|