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 | 124 | 32 | 91 |
| Samples | 116 | 32 | 83 |
| Peptides | 94 | 19 | 78 |
Function
FEN1 · Flap structure-specific endonuclease 1
The protein encoded by this gene removes 5' overhanging flaps in DNA repair and processes the 5' ends of Okazaki fragments in lagging strand DNA synthesis. Direct physical interaction between this protein and AP endonuclease 1 during long-patch base excision repair provides coordinated loading of the proteins onto the substrate, thus passing the substrate from one enzyme to another. The protein is a member of the XPG/RAD2 endonuclease family and is one of ten proteins essential for cell-free DNA replication. DNA secondary structure can inhibit flap processing at certain trinucleotide repeats in a length-dependent manner by concealing the 5' end of the flap that is necessary for both binding and cleavage by the protein encoded by this gene. Therefore, secondary structure can deter the protective function of this protein, leading to site-specific trinucleotide expansions. [provided by RefSeq, Jul 2008].
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 |
|---|---|---|---|
| ENST00000305885 | P39748 | 124 | 94 |
Gene Properties
Recurrent Mutations
All 94 amino-acid changes on canonical ENST00000305885 · 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 FEN1 · cell line vs tissue
For each cancer type, the fraction of samples that carry at least one missense/complex mutation anywhere in FEN1 – 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 |
|---|---|---|
| Oral Cavity Carcinoma | 4/54 7% | 0/0 0% |
| T-Lymphoblastic Leukemia | 2/40 5% | 0/0 0% |
| Glioblastoma | 3/98 3% | 0/0 0% |
| Hodgkins Lymphoma | 2/16 12% | 0/122 0% |
| Burkitts Lymphoma | 0/32 0% | 3/196 2% |
| Endometrial Carcinoma | 4/42 10% | 4/612 1% |
| Mesothelioma | 2/62 3% | 0/165 0% |
| Gastric Carcinoma | 1/74 1% | 11/1809 1% |
| Colorectal Carcinoma | 6/143 4% | 14/3239 0% |
| Plasma Cell Myeloma | 0/44 0% | 2/305 1% |
| Germ Cell Tumour | 0/25 0% | 1/169 1% |
| Bladder Carcinoma | 0/58 0% | 4/956 0% |
| Squamous Cell Lung Carcinoma | 0/57 0% | 3/810 0% |
| Melanoma | 0/210 0% | 7/1899 0% |
| Non-Small Cell Lung Carcinoma | 2/304 1% | 3/1390 0% |
| Biliary Tract Carcinoma | 0/54 0% | 3/950 0% |
| Head and Neck Carcinoma | 0/85 0% | 5/1574 0% |
| Ovarian Carcinoma | 0/109 0% | 3/998 0% |
| Non-Cancerous | 0/104 0% | 2/830 0% |
| Glioma | 0/52 0% | 4/2127 0% |
| Neuroendocrine Tumour | 0/154 0% | 1/577 0% |
| Hepatocellular Carcinoma | 0/46 0% | 3/2210 0% |
| Esophageal Carcinoma | 0/23 0% | 1/769 0% |
| Other Sarcomas | 0/69 0% | 1/699 0% |
| Breast Carcinoma | 1/144 1% | 3/3264 0% |
| Thyroid Gland Carcinoma | 0/45 0% | 2/1592 0% |
| Pancreatic Carcinoma | 2/89 2% | 0/1611 0% |
| B-Cell Non-Hodgkins Lymphoma | 3/88 3% | 0/2534 0% |
| Esophageal Squamous Cell Carcinoma | 0/51 0% | 2/2550 0% |
| Other Solid Cancers | 0/94 0% | 1/1515 0% |
Mutation Distribution
Where FEN1 is mutated · all tissues, split by cell line vs tissue
How many mutations in FEN1 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 124 mutations in FEN1
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 |
|---|