The present invention relates to functional foods and dietary supplements comprising a specific diamine oxidase (DAO) enzyme derived from the yeast Yarrowia lipolytica PO1f, uses of said enzyme and respective methods for the production of biogenic amine-depleted products, and said enzyme for use in medicine, in particular for use in the prevention or treatment of a condition or disease that is associated with increased levels of biogenic amines.

Provided herein, among other things, is an engineered non-plant cell that produces a tropane alkaloid product, a precursor of a tropane alkaloid product, or a derivative of a tropane alkaloid product. A method for producing a tropane alkaloid, a precursor of a tropane alkaloid product, or a derivative of a tropane alkaloid product that makes use of the cell is also described.

Provided are recombinant adeno-associated virus (rAAV) vectors, methods of treating a condition (e.g., an ocular condition), pharmaceutical compositions, and other compositions and methods, in which the rAAV vector comprises a polynucleotide encoding diamine oxidase (DAO1). Methods of treatment may include administration to the lacrimal gland.

The present invention relates to a pharmaceutical, cosmetic or dermo-cosmetic composition that comprises DAO, for use in the prevention or treatment of diseases or pathological conditions associated with high levels of histamine in blood which involve an increase in pain, preferably fibromyalgia, characterised in that the application of the composition is topical.