HLA-DOB: A Key "Coordinator" Between Cutaneous Melanoma and Psoriasis

Area of Science:

• Immunodermatology
• Genetic Epidemiology
• Oncology

Background:

• Psoriasis is a chronic inflammatory skin condition linked to immune dysfunction.
• The relationship between psoriasis and cutaneous melanoma risk remains unclear.
• Investigating potential causal links and shared genetic factors is crucial.

Purpose of the Study:

• To explore the potential causal relationship between psoriasis and cutaneous melanoma using Mendelian randomization.
• To identify genetic factors that may influence the risk of both conditions.

Main Methods:

• Utilized Mendelian randomization (MR) with genome-wide association study (GWAS) data for psoriasis and melanoma.
• Employed various MR methods (IVW, MR-Egger, weighted median) and sensitivity analyses.
• Performed co-localization and transcriptome analyses to identify and validate risk genes.

Main Results:

• Forward MR indicated a significant inverse causal effect of psoriasis on melanoma risk (PIVW=0.040).
• Identified HLA-DOB, NOTCH4, and VARS2 as genes associated with psoriasis risk.
• HLA-DOB, downregulated in melanoma, was linked to better prognosis and enriched in B and myeloid cells.

Conclusions:

• A significant inverse causal relationship exists between psoriasis and cutaneous melanoma.
• HLA-DOB acts as a crucial genetic link, being a risk gene for psoriasis and a protective factor for melanoma.