rs174568
— FADS2 FADS2 C>T (delta-6 desaturase)
Intronic regulatory variant in FADS2 encoding delta-6 desaturase, the rate-limiting enzyme for long-chain PUFA synthesis; the T allele reduces conversion of linoleic acid to GLA and ALA to SDA, lowering downstream arachidonic acid, EPA, and DHA production.
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