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Molecular and Functional Characterization and 1 Expression Analysis of a Δ 6 Fatty Acyl Desaturase 2 cDNA of European Sea Bass ( Dicentrarchus labrax L . ) 3

The extent to which fish species can produce highly unsaturated fatty acids 29 (HUFA) from C 18 fatty acids varies with their complement of fatty acyl desaturase 30 (FAD) enzymes. Marine fish are unable to produce HUFA at a significant rate due to 31 apparent deficiencies in one or more enzymatic steps in the desaturation/elongation 32 pathway. It is not known if this is due to a lack of the genes or to tight regulation of 33 the enzymatic activity in some of the transformation steps. In the present study, we 34 report molecular cloning, cDNA, protein and functional analysis of a ∆6 FAD of 35 European sea bass (Dicentrarchus labrax L.), and describe its tissue expression and 36 nutritional regulation.