Uveal and cutaneous melanoma share a common mutation with distinct prognostic implications: A bioinformatic study
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What was known before:
Uveal melanoma (UM) and cutaneous melanoma (CM) arise from a common melanocytic lineage but exhibit distinct genetic landscapes, biological behavior, and clinical outcomes.
Pigmentation-related genes, including IRF4 and HERC2, have been implicated in melanoma susceptibility and prognosis; however, the extent of shared genetic variants between UM and CM has remained unclear.
Previous studies have primarily investigated UM and CM separately, leaving limited understanding of their common genetic architecture and potential shared prognostic biomarkers.
What this study adds:
This bioinformatic analysis identified only two shared validated genetic variants between UM and CM across publicly available databases: rs12203592 (IRF4) and rs12913832 (HERC2).
Protein–protein interaction analysis demonstrated that IRF4 and OCA2 directly interact with HERC2, supporting a biologically plausible pigmentation-related pathway linking the two melanoma subtypes.
The findings suggest that IRF4 may represent a common prognostic biomarker across both UM and CM, while combined assessment of IRF4 and HERC2 could improve future risk stratification and facilitate more personalized therapeutic approaches.
Background
Uveal melanoma (UM) and cutaneous melanoma (CM) both originate from the same cell line. This proposes the possibility of a shared mechanism between entities, requiring explicit investigation.
Methods
Data from GWAS Catalog and DisGeNET were used to identify shared variation-disease associations (VDAs) between UM and CM. The results were validated using the Ensembl database. In the next step, the STRING database was used to identify the protein– protein interaction.
Results
Subsequently, 109 unique VDAs were identified for UM and 880 for CM. However, only 2 VDAs were found to be shared among UM and CM in different ethnic groups. These shared VDAs were rs12203592 of the IRF4 gene, rs12913832 of the HECT and RLD domain-containing E3 ubiquitin protein ligase 2 (HERC2) gene. Notably, PPI network assessment through STRING showcased that OCA2 and IRF4 directly interacted with HERC2.
Conclusion
While HERC2 acts as a poor prognostic factor in uveal melanoma, IRF4 status is a key prognostic indicator in both UM and CM. Identifying IRF4 allele contributions enables a better understanding of melanoma pathogenesis and fosters the development of disease-specific approaches.
