# RAD51C

Source: https://onco.cc/targets/rad51c/  
OnCo record `rad51c` (Target). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

RAD51C (DNA repair protein RAD51 homolog 3) is a gene. The public catalogues list it as a drug target, a biomarker and a DNA repair gene, and clinical evidence ties its variants to diagnosis, prognosis or drug response. Tied to Ovarian cancer, Breast cancer, Gastric & gastro-oesophageal junction cancer and 2 more.

## Summary

Essential for the homologous recombination (HR) pathway of DNA repair. Involved in the homologous recombination repair (HRR) pathway of double-stranded DNA breaks arising during DNA replication or induced by DNA-damaging agents. Part of the RAD51 paralog protein complexes BCDX2 and CX3 which act at different stages of the BRCA1-BRCA2-dependent HR pathway.

CIViC holds 1 clinical evidence item and 0 assertions across 1 variant, naming Olaparib. Open Targets scores its association with cancer at 0.87 (direct and indirect evidence; datatypes genetic literature 0.86, affected pathway 0.81, literature 0.97, genetic association 0.88, somatic mutation 0.96, animal model 0.25).

## Fields

- Kind: Target
- Last checked: 2026-09-23
- Also known as: RAD51 paralog C; DNA repair protein RAD51 homolog 3; RAD51L2; FANCO
- Tags: cancer-genes-wave
- Symbol: RAD51C
- Class: other
- Biology: Essential for the homologous recombination (HR) pathway of DNA repair. Involved in the homologous recombination repair (HRR) pathway of double-stranded DNA breaks arising during DNA replication or induced by DNA-damaging agents. Part of the RAD51 paralog protein complexes BCDX2 and CX3 which act at different stages of the BRCA1-BRCA2-dependent HR pathway. Upon DNA damage, BCDX2 seems to act downstream of BRCA2 recruitment and upstream of RAD51 recruitment; CX3 seems to act downstream of RAD51 recruitment; both complexes bind predominantly to the intersection of the four duplex arms of the Holliday junction (HJ) and to junction of replication forks. The BCDX2 complex was originally reported to bind single-stranded DNA, single-stranded gaps in duplex DNA and specifically to nicks in duplex DNA. The BCDX2 subcomplex RAD51B:RAD51C exhibits single-stranded DNA-dependent ATPase activity suggesting an involvement in early stages of the HR pathway. Location: Nucleus; Cytoplasm; Cytoplasm, perinuclear region; Mitochondrion (UniProt). Locus 17q22 (HGNC).
- Where found: Ovarian cancer: Open Targets association 0.83 with ovarian cancer (MONDO_0008170); Breast cancer: Open Targets association 0.82 with breast cancer (MONDO_0007254); Gastric & gastro-oesophageal junction cancer: Open Targets association 0.61 with gastric cancer (MONDO_0001056); Prostate cancer: CIViC evidence names this disease; Melanoma: Open Targets association 0.50 with melanoma (MONDO_0005105)

## Notes

- Written by scripts/fetch-cancer-genes.ts from CIViC, Open Targets, IntOGen, HGNC and UniProt; the function text is UniProt's, condensed and in UK spelling. Roles: CIViC lists 1 therapies; CIViC holds 1 clinical evidence items on its variants; UniProt keyword "DNA repair". Evidence tier "clinical-evidence" is the strongest of those signals.
- Prevalence not recorded: none of the sources gives a positivity rate.

## Sources

- HGNC HGNC:9820: https://www.genenames.org/data/gene-symbol-report/#!/hgnc_id/HGNC:9820
- UniProt O43502: https://www.uniprot.org/uniprotkb/O43502/entry
- NCBI Gene 5889: https://www.ncbi.nlm.nih.gov/gene/5889
- Ensembl ENSG00000108384: https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000108384

## Connected records

- collections: [CIViC](https://onco.cc/collections/civic/), [Open Targets Platform](https://onco.cc/collections/open-targets/)
- cancers: [Breast cancer (all types)](https://onco.cc/cancers/breast-cancer/), [Gastric & gastro-oesophageal junction cancer](https://onco.cc/cancers/gastric/), [Melanoma](https://onco.cc/cancers/melanoma/), [Ovarian cancer](https://onco.cc/cancers/ovarian/), [Prostate cancer](https://onco.cc/cancers/prostate/)

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JSON: https://onco.cc/api/v1/entities/rad51c.json