Yeast strain that produces demosterol, characterized in that it does not have a functional copy of the gene that encodes the enzyme 24-C-methyltransferase (erg6) and because it expresses the heterologous enzyme 7-dehydrocholesterol reductase.Cepa de levadura que produce demosterol, caracterizada por que no posee copia funcional del gen que codifica la enzima 24-C-metiltransferasa (erg6) y por que expresa la enzima heteróloga 7-dehidrocolesterol reductasa.