Preparation of 7-dehydrocholesterol and/or the biosynthetic intermediates and/or secondary products thereof in transgenic organisms

A combination of nucleic acid constructs, which comprises at least one nucleic acid construct selected from the groups A to C A nucleic acid construct comprising nucleic acids encoding a Δ8-Δ7-isomerase, which are functionally linked to one or more regulatory signals ensuring transcription and translation in organisms, B nucleic acid construct comprising nucleic acids encoding a Δ5-desaturase, which are functionally linked to one or more regulatory signals ensuring transcription and translation in organisms and C nucleic acid construct comprising nucleic acids encoding a Δ24-reductase, which are functionally linked to one or more regulatory signals ensuring transcription and translation in organisms, and at least one nucleic acid construct selected from the groups D to H D nucleic acid construct comprising nucleic acids encoding an HMG-CoA reductase, which are functionally linked to one or more regulatory signals ensuring transcription and translation in organisms, E nucleic acid construct comprising nucleic acids encoding a lanosterol C14-demethylase, which are functionally linked to one or more regulatory signals ensuring transcription and translation in organisms, F nucleic acid construct comprising nucleic acids encoding a squalene epoxidase, which are functionally linked to one or more regulatory signals ensuring transcription and translation in organisms, G nucleic acid construct comprising nucleic acids encoding a squalene synthetase, which are functionally linked to one or more regulatory signals ensuring transcription and translation in organisms, H nucleic acid construct comprising nucleic acids encoding a sterol acyltransferase, which are functionally linked to one or more regulatory signals ensuring transcription and translation in organisms.