Patent ID: 8088974

Claim:
A method for the production of fatty acid esters with an increased content of polyunsaturated fatty acids with at least two double bonds, which comprises introducing, into a fatty-acid-ester-producing organism, at least one nucleic acid sequence comprising a sequence selected from the group consisting of a) a nucleic acid sequence with the sequence shown in SEQ ID NO: 3, b) a nucleic acid sequence encoding the amino acid sequence shown in SEQ ID NO: 4, c) a nucleic acid sequence encoding a polypeptide having at least 95% homology with the amino acid sequence shown in SEQ ID NO: 4 and having Δ6-desaturase activity, growing the organism, and isolating the fatty acid esters present in the organism, wherein the organism is a microorganism, a yeast, or a plant or plant cell.