Genetic liability to psoriasis predicts severe disease outcomes

Area of Science:

• Genetics
• Dermatology
• Epidemiology

Background:

• Psoriasis is a common inflammatory skin condition with varied severity.
• Severe psoriasis impacts quality of life and increases comorbidity burden.
• Prognostic biomarkers are needed for resource allocation and early intervention.

Purpose of the Study:

• To identify genetic biomarkers for predicting psoriasis severity.
• To evaluate the utility of a polygenic risk score (PRS) for stratifying psoriasis patients.
• To compare the effectiveness of genetic versus epidemiological risk factors for predicting severe disease.

Main Methods:

• Utilized four European population-based biobanks for analysis.
• Classified psoriasis severity based on clinical intervention levels.
• Tested common genetic variants, PRS, and epidemiological factors for association with severe psoriasis via meta-analysis.

Main Results:

• Genetic variants in MHC, TNIP1, and IL12B loci associated with severe psoriasis.
• Psoriasis susceptibility PRS strongly correlated with disease severity, comparable to obesity and smoking.
• Individuals in the top 5% PRS were 1.23-2.00 times more likely to have severe psoriasis.

Conclusions:

• The psoriasis susceptibility PRS is a valuable tool for identifying individuals at high risk of severe disease.
• PRS may be more effective than epidemiological factors for stratifying patients.
• Early intervention can be targeted to individuals identified by PRS for optimal outcomes.