What role does FADS1 play in skin aging?

The provided knowledge contexts contain no information on FADS1. This answer is based on general biological understanding. FADS1 encodes delta-5 desaturase, a key enzyme in polyunsaturated fatty acid (PUFA) metabolism. It converts dihomo-gamma-linolenic acid (DGLA) into arachidonic acid (AA), thereby influencing the omega-6 to omega-3 ratio. This ratio modulates inflammatory processes involved in skin aging—such as the production of lipid mediators like prostaglandins and leukotrienes. Some studies suggest links between FADS1 variants and skin conditions like acne or eczema, but direct evidence for skin aging (wrinkles, elasticity) is weak and mostly mechanistic. The evidence grade is therefore 'mechanistic' or 'unclear'. Direct-to-consumer genetic tests for FADS1 do not provide clinically validated predictions for skin aging. A balanced intake of omega-3 fatty acids (e.g., from fish oil) may have anti-inflammatory effects regardless of genotype, but does not replace dermatological advice.