Crustaceans as production systems for therapeutic proteins
A crustacean or rotifer is infected with a recombinant infectious virus that expresses a protein exogenous to the virus. The genome of the crustacean or rotifer itself remains unaltered. Crustacean, rotifer, insect, or viral promoters drive the transcription of a gene inserted into the recombinant virus genome, and the virus replicates in the crustacean or rotifer cell cytoplasm. The infected crustacean or rotifer can be provided directly to humans or non-human animals, or, following production and harvest of the crustaceans or rotifers, purified recombinant protein or polypeptide can be provided. Large quantities of biopharmaceuticals can be produced rapidly and inexpensively using this production system.
1. A recombinant infectious virus selected from the group consisting of White Spot Syndrome Virus (WSSV) or Taura Syndrome Virus (TSV) comprising a nucleic acid encoding a polypeptide that is not native to said virus operably linked to a promoter that is active in a shrimp cell.
2. The virus of claim 1 , wherein the promoter is an exogenous promoter to said virus.
3. A method of producing a recombinant polypeptide comprising:
(a) infecting a shrimp with the virus according to claim 1 at a temperature permissive for infection that does not trigger viral injury;
(b) replicating the virus in one or more cells of said shrimp; and
(c) reducing the temperature of said shrimp of step (b) to a temperature that triggers increased replication of said virus and expression of said polypeptide that is not native to said virus.
4. The method of claim 3 , wherein the temperature permissive for infection is at or above about 30° C.
5. The method of claim 3 , wherein the temperature of step (c) is at or below about 28° C.
6. The method of claim 3 , wherein the polypeptide that is not native to said virus is an antibody, an antibody fragment, or a hormone.
7. A method of producing an antigen in a shrimp comprising:
(a) infecting a shrimp with the virus according to claim 1 at a temperature permissive for infection, wherein the polypeptide that is not native to the virus is an antigen;
(b) replicating the virus in one or more cells of said shrimp; and
(c) reducing the temperature of said shrimp to a temperature that triggers increased replication of said virus and expression of said antigen.