Non-human transgenic mammal comprising a modified MSP-1 nucleic acid
First Claim
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1. A non-human transgenic mammal whose genome comprises a modified SEQ ID NO:
- 2 encoding wild-type merozoite surface protein (MSP-1) operably linked to a mammary gland promoter,wherein the modification reduces the AT content of SEQ ID NO;
2 by 50% or less by replacement of protozoan codons with codons preferred by mammalian cells,wherein the replacement codons encode the same amino acid as the replaced codon, andwherein the transgenic mammal expresses said modified SEQ ID NO;
2, thereby to produce MSP-1 in its milk.
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Abstract
The invention provides modified recombinant nucleic acid sequences (preferably DNA) and methods for increasing the mRNA levels and protein expression of malarial surface protein MSP-1 which is known to be difficult to express in cell culture systems, mammalian cell culture systems, or in transgenic animals. The preferred protein candidates for expression using the recombinant techniques of the invention are MSP-1 proteins expressed from DNA coding sequences comprising reduced overall AT content or AT rich regions and/or mRNA instability motifs and/or rare codons relative to the native MSP-1 gene.
26 Citations
43 Claims
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1. A non-human transgenic mammal whose genome comprises a modified SEQ ID NO:
- 2 encoding wild-type merozoite surface protein (MSP-1) operably linked to a mammary gland promoter,
wherein the modification reduces the AT content of SEQ ID NO;
2 by 50% or less by replacement of protozoan codons with codons preferred by mammalian cells,wherein the replacement codons encode the same amino acid as the replaced codon, and wherein the transgenic mammal expresses said modified SEQ ID NO;
2, thereby to produce MSP-1 in its milk. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- 2 encoding wild-type merozoite surface protein (MSP-1) operably linked to a mammary gland promoter,
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8. A method of producing a merozoite surface protein 1 (MSP-1) in the milk of a non-human transgenic mammal, comprising:
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providing a non-human transgenic mammal whose genome comprises a modified SEQ ID NO;
2 encoding wild-type MSP-1 operably linked to a mammary gland promoter, wherein the modification reduces the AT content of SEQ ID NO;
2 by 50% or less by replacement of protozoan codons with codons preferred by mammalian cells, wherein the replacement codons encode the same amino acid as the replaced codon; andallowing the transgenic mammal to express said modified SEQ ID NO;
2, thereby to produce MSP-1 in its milk. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-human transgenic mammal whose genome comprises a modified SEQ ID NO:
- 2 encoding a wild-type MSP-1 operably linked to a mammary gland promoter,
wherein the modification eliminates all the mRNA instability motifs in said SEQ ID NO;
2 by replacement of protozoan codons with codons preferred by mammalian cells,wherein the replacement codons encode the same amino acid as the replaced codon, and wherein the transgenic mammal expresses said modified SEQ ID NO;
2, to thereby produce MSP-1 in its milk. - View Dependent Claims (16, 17, 18, 19, 20, 21)
- 2 encoding a wild-type MSP-1 operably linked to a mammary gland promoter,
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22. A method of producing a merozoite surface protein 1 (MSP-1) sequence in the milk of a non-human transgenic mammal, comprising:
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providing a non-human transgenic mammal whose genome comprises a modified SEQ ID NO;
2 encoding a wild-type MSP-1 operably linked to a mammary gland promoter,wherein the modification eliminates all the mRNA instability motifs in said SEQ ID NO;
2 by replacement of protozoan codons with codons preferred by mammalian cells, andwherein the replacement codons encode the same amino acid as the replaced codon; and
,allowing the transgenic mammal to express said modified SEQ ID NO;
2, to thereby produce MSP-1 in its milk. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A transgenic non-human mammal whose genome comprises a modified SEQ ID NO:
- 2 encoding a wild-type MSP-1 operably linked to a mammary gland specific promoter, wherein the modification eliminates all the mRNA instability motifs of said SEQ ID NO;
2 by replacement of one or more protozoan codons with codons preferred by mammalian cells and the modification reduces the AT content of said SEQ ID NO;
2 by 50% or less by replacement of protozoan codons with codons preferred by mammalian cells, wherein the replacement codons encode the same amino acid as the replaced codon and wherein the transgenic mammal expresses said modified SEQ ID NO;
2, thereby to produce MSP-1 in its milk. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
- 2 encoding a wild-type MSP-1 operably linked to a mammary gland specific promoter, wherein the modification eliminates all the mRNA instability motifs of said SEQ ID NO;
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36. A method for producing a merozoite surface protein 1 (MSP-1) sequence in the milk of a non-human transgenic mammal, comprising:
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providing a non-human transgenic mammal whose genome comprises a modified SEQ ID NO;
2 encoding a wild-type MSP-1 operably linked to a mammary gland promoter, wherein the nucleic acid has been modified bya) elimination of mRNA instability motifs by the replacement of protozoan codons in SEQ ID NO;
2 with codons preferred by mammalian cells; andb) reduction of AT content by 50% a or less by the replacement of one or more AT-containing protozoan codons of SEQ ID NO;
2 with codons preferred by mammalian cells,wherein the replacement codons encode the same amino acid as the replaced codon; and allowing the transgenic mammal to express said modified SEQ ID NO;
2, to thereby produce MSP-1 in its milk. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43)
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Specification