| 摘要 |
This invention is a transgenic fish that expresses an amino acid sequence (either peptide or protein) under control of a chemical substance when the chemical substance is supplied to the fish. The protein will preferably be a heterologous protein, such as a protein useful as a pharmaceutical product in humans, or animals. The chemical substance may be a hormone or hormone mimic, such as a steroid, thyroid, retinoid and vitamin D. Especially preferred are fish responsive to estrogens and having estrogen responsive elements in the regulatory sequences for a heterologous protein. The transgenic fish may express a desired heterologous protein in a specific tissue such as a particular organ, especially preferred fish expresses a heterologous protein or peptide in the liver. Another preferred fish expresses a protein or peptide in the egg. Alternatively this invention may be viewed as a method for production of a desired amino acid sequence comprising the steps of producing a construct of a DNA sequence comprising a DNA sequence coding for a desired amino acid sequence; inserting the DNA sequence coding for the desired protein into the genome of a fish such that the expression of the DNA sequence coding for the desired amino acid sequence is under the control of a regulatory region of DNA that regulates the expression of the amino acid sequence in response to a chemical substance, when the chemical substance is supplied to the fish. In another embodiment this invention is a method of producing a desired amino acid sequence in a fish comprising providing a chemical substance to a transgenic fish having a gene for expression of the desired protein under control of a regulatory element in the transgenic fish that regulates production of the desired protein in response to the presence or absence of the chemical substance. Preferred chemical substances are hormones or hormone like molecules such as steroids, thyroid hormones, retinoids and the D vitamins.
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