Pichia ciferrii cells and use thereof

An isolated Pichia ciferrii cell, characterized in that the cell has, compared to its wild type, a reduced activity of at least one of the enzymes which are encoded by the intron-free nucleic acid sequences selected from the two groups A) and B) consisting of

• A) Seq ID No 1, Seq ID No 3, Seq ID No 5, Seq ID No 7, Seq ID No 9, Seq ID No 11,
• B) a sequence which is at least 80% identical to any of the sequences Seq ID No 1, Seq ID No 3, Seq ID No 5, Seq ID No 7, Seq ID No 9, Seq ID No 11.