In view of the above, an expression system is needed that is usable in an eukaryotic cell extensively autologous with respect to sugars, amino acids and that is extensively independent of growth factors. It has been shown that plant cells, in particular microalgae cells, can be used for the production of recombinant proteins and overcome most of the above problems. Microalga cultures are comparably easy to handle and, in principle, scalable to large production scales. Furthermore, microalgae merely require a slightly salty aqueous environment, CO2 and light, can be supplemented by simple carbon sources, or a combination of these strategies to grow rapidly and produce the recombinant protein of interest. Therefore, the cultivation of microalgae is relatively inexpensive. These cultures can be extensively free of sugars and amino acids. The use of solar energy to produce biomass and recombinant protein production is an attractive aspect of these cells in light of the goal of sustainability. Unfortunately, the efficient production of recombinant proteins in microalgae is hampered because of the tightly regulated gene expression, preference for certain nucleic acid codon usage, and bias to its own promoters. The present invention allows to overcome these problems with highly efficient production and direct secretion of target polypeptides into the medium and in addition enables simultaneous monitoring of the polypeptide production without disturbing the expression system.
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