Novel methods and interferon deficient substrates for the propagation of viruses

Abstract

The present invention relates, to novel methods and substrates for the propagation of viruses. The invention relates to IFN-deficient substrates and methods for propagating viruses in these unconventional substrates. In particular, the invention relates to methods of propagating viruses in immature embryonated eggs, preferably six- to nine-day-old chicken eggs. The methods of the invention are particularly attractive for growing viruses suitable for use in vaccine and pharmaceutical formulations.

1 . An interferon deficient cell line containing a genetically engineered attenuated influenza virus, in which the genome of the attenuated influenza virus encodes a truncated NS1 protein composed of between 90 and 130 N-terminal amino acid residues of the NS1 protein of the same or a different influenza virus strain, so that the genetically engineered influenza virus has an impaired interferon antagonist phenotype. 
   
   
       2 . The interferon deficient cell line of  claim 1  in which the genetically engineered attenuated influenza virus genome encodes a truncated NS1 protein composed of between 90 and 100 N-terminal amino acid residues of the NS1 protein of the same or a different influenza virus strain. 
   
   
       3 . The interferon deficient cell line of  claim 1  in which the genetically engineered attenuated influenza virus genome encodes a truncated NS1 protein of between 100 and 110 N-terminal amino acid residues of the NS1 protein of the same or a different influenza virus strain. 
   
   
       4 . The interferon deficient cell line of  claim 1  in which the genetically engineered attenuated influenza virus genome encodes a truncated NS1 protein of between 110 and 120 N-terminal amino acid residues of the NS1 protein of the same or a different influenza virus strain. 
   
   
       5 . The interferon deficient cell line of  claim 1  in which the genetically engineered attenuated influenza virus genome encodes a truncated NS1 protein of between 120 and 130 N-terminal amino acid residues of the NS1 protein of the same or a different influenza virus strain. 
   
   
       6 . An interferon deficient cell line containing a genetically engineered attenuated influenza virus, in which the genome of the attenuated influenza virus encodes a truncated NS1 protein composed of amino acid residues 1 to 130, amino acid residues 1 to 124, amino acid residues 1 to 120, amino acid residues 1 to 110, amino acid residues 1 to 100, amino acid residues 1 to 99, amino acid residues 1 to 90, amino acid residues 1 to 89, amino acid residues 1 to 70, or amino acid residues 1 to 60 of the NS1 protein of the same or a different influenza virus strain, so that the genetically engineered attenuated influenza virus has an impaired interferon antagonist phenotype. 
   
   
       7 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 130 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       8 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 124 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       9 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 120 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       10 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 110 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       11 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 100 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       12 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 99 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       13 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 90 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       14 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 89 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       15 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 70 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       16 . The interferon deficient cell line of  claim 6  in which the genetically engineered influenza virus genome encodes a truncated NS1 protein composed of amino acid residues 1 to 60 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       17 . The interferon deficient cell line of  claim 6  in which the interferon deficient cell line is not a STAT1 (−) cell line. 
   
   
       18 . The interferon deficient cell line of  claim 17  in which the interferon deficient cell line is not Vero cells. 
   
   
       19 . The interferon deficient cell line of  claim 1  in which the interferon deficient cell line is not Vero cells. 
   
   
       20 . The interferon deficient cell line of  claim 6  in which the interferon deficient cell line is Vero cells. 
   
   
       21 . An interferon deficient cell line containing an attenuated influenza virus, in which the genome of the attenuated influenza virus has an NS1 gene of the same or a different influenza virus strain, wherein the NS1 gene has a mutation such that the attenuated influenza virus has an impaired interferon antagonist phenotype, wherein said virus is not influenza C virus and the interferon deficient cell line is not Vero cells and is not STAT1 (−) cell lines. 
   
   
       22 . The interferon deficient cell line of  claim 21 , wherein the attenuated influenza virus is genetically engineered. 
   
   
       23 . The interferon deficient cell line of  claim 21 , wherein the mutation in the NS1 gene is a deletion at the C-terminus of NS1. 
   
   
       24 . The interferon deficient cell line of  claim 21 , wherein the NS1 gene encodes a truncated NS1 protein composed of amino acid residues 1 to 80 of the NS1 protein of the same or a different influenza virus strain. 
   
   
       25 . The interferon deficient cell line of  claim 6 , wherein the influenza virus is an influenza A virus. 
   
   
       26 . The interferon deficient cell line of  claim 6 , wherein the influenza virus is an influenza B virus. 
   
   
       27 . The interferon deficient cell line of  claim 6 , wherein the attenuated influenza virus is engineered to encode a foreign antigen. 
   
   
       28 . The interferon deficient cell line of  claim 6 , wherein the attenuated influenza virus is engineered to encode a tumor antigen. 
   
   
       29 . The interferon deficient cell line of  claim 6 , wherein the attenuated influenza virus is engineered to encode an epitope from an infectious agent other than an influenza virus. 
   
   
       30 . The interferon deficient cell line of  claim 6 , wherein the attenuated influenza virus is engineered to encode an epitope from another virus. 
   
   
       31 . The interferon deficient cell line of  claim 6 , wherein the attenuated influenza virus is engineered to encode an epitope from a bacteria. 
   
   
       32 . The interferon deficient cell line of  claim 6 , wherein the attenuated influenza virus is engineered to encode an epitope from a parasite.