title: Fatty acid desaturase 2 (FADS2) insertion/deletion polymorphism impact on muscle fatty acid profile in European grayling (Thymallus thymallus).
abstract: An insertion (In)/deletion (Del) polymorphism in the fatty acid desaturase 2 (FADS2) gene, which codes for Δ6-desaturase, was for the first time observed in fish. The polymorphism is located in the seventh intron of FADS2 and the insertion consists of eleven repeats of CTGT (44 bp) with an allelic frequency, for the insertion, of 39 %. The polymorphism was associated with a modulation in Δ6-desaturase activity as significant effects on the ratio of EPA or DHA to their precursors were found (P< 0·001). A different distribution of SFA, MUFA and PUFA among the In/In, In/Del and Del/Del groups was also detected in fish fillet. The results suggest that genetic selection for this marker might improve the ability of European grayling to utilise dietary n-3 long-chain PUFA precursors, as Δ6-desaturase is the rate-limiting enzyme in the production of EPA and DHA from α-linolenic acid.
authors.affiliation: Department of Food Science, University of Udine, Via Sondrio 2A, 33100 Udine, Italy.
authors.forename: Bénédicte
authors.initials: B
authors.lastname: Renaville
authors.forename: Francesca
authors.initials: F
authors.lastname: Tulli
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Bruno
authors.forename: Emilio
authors.initials: E
authors.lastname: Tibaldi
authors.forename: Maria
authors.initials: M
authors.lastname: Messina
mesh_terms: D000483:Alleles; D000818:Animals; D004041:Dietary Fats / Q000378:metabolism; D044943:Fatty Acid Desaturases / Q000235:genetics* / Q000378:metabolism; D005227:Fatty Acids / Q000235:genetics* / Q000378:metabolism; D015525:Fatty Acids, Omega-3 / Q000235:genetics / Q000378:metabolism; D007438:Introns; D018482:Muscle, Skeletal / Q000378:metabolism*; D016254:Mutagenesis, Insertional; D011110:Polymorphism, Genetic; D012487:Salmonidae / Q000235:genetics* / Q000378:metabolism; D017384:Sequence Deletion
chemical_list: D004041:Dietary Fats; D005227:Fatty Acids; D015525:Fatty Acids, Omega-3; D044943:Fatty Acid Desaturases