Methods of modulating nucleic acid stability and protein expression
AssigneeCase Western Reserve University
InventorsJeffery M. Coller, Kristian E. Baker
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Abstract
A synthetic nucleic acid which encodes a protein wherein at least one optimal or non-optimal codon in a wild type nucleic acid encoding the protein has been replaced respectively with one or more non-optimal codons or optimal codons encoding the same amino acid.
Claims16
A synthetic nucleic acid which encodes a protein in a mammalian host cell, wherein at least one optimal or non-optimal codon in a wild type nucleic acid encoding the protein has been replaced respectively with one or more non-optimal codons or optimal codons encoding the same amino acid, the synthetic nucleic acid being capable of expressing the protein at a level that is at least about 10% different compared to that expressed by the wild type nucleic acid in an in vitro mammalian cell culture system under identical conditions, and wherein the optimal codons are selected from the group consisting of get (Alanine), ggt (Glycine), gtc (Valine), ttg (Leucine), gtt (Valine), cca (Proline), act (Threonine), tct (Serine), tcc (Serine), gaa (Glutamic Acid), cgt (Arginine), caa (Glutamine), att (Isoleucine), aga (Arginine), and tgt (Cysteine);
- and the non-optimal codons are selected from the group consisting of ggc (Glycine), tgg (Tryptophan), atg (Methionine), tgc (Cysteine), ccc (Proline), gtg (Valine), cgc (Arginine), gag (Glutamic Acid), cag (Glutamine), agc (Serine), and ctg (Leucine);
- wherein the replacement of one or more codons from the nucleic acid sequence with one or more optimal codons increases stabilization of mRNA and mRNA half-life or with one or more non-optimal codons decreases stabilization of mRNA and mRNA half-life transcribed from the nucleic acid sequence compared to the nucleic acid sequence prior to replacement.
A method of modulating the expression of a recombinant protein in a mammalian host cell, the method comprising:
- identifying optimal and non-optimal codons in a nucleic acid sequence that encodes the protein,
- replacing one or more of the optimal codons with a non-optimal codon encoding the same amino acid as the replaced codon or replacing one or more of the non-optimal codons with an optimal codon encoding the same amino acid,
- and transfecting the mammalian host cell with the nucleic acid with the replaced codon, wherein the replacement of the one or more codons from the nucleic acid sequence modulates expression of the recombinant protein in the host cell at least about 10% compared to the nucleic sequence prior to replacement, and wherein the optimal codons are selected from the group consisting of get (Alanine), ggt (Glycine), gtc (Valine), ttg (Leucine), gtt (Valine), cca (Proline), act (Threonine), tct (Serine), tcc (Serine), gaa (Glutamic Acid), cgt (Arginine), caa (Glutamine), att (Isoleucine), aga (Arginine), and tgt (Cysteine);
- and the non-optimal codons are selected from the group consisting of ggc (Glycine), tgg (Tryptophan), atg (Methionine), tgc (Cysteine), ccc (Proline), gtg (Valine), cgc (Arginine), gag (Glutamic Acid), cag (Glutamine), agc (Serine), and ctg (Leucine);
- wherein the replacement of one or more codons from the nucleic acid sequence with one or more optimal codons increases stabilization of mRNA and mRNA half-life or with one or more non-optimal codons decreases stabilization of mRNA and mRNA half-life transcribed from the nucleic acid sequence compared to the nucleic acid sequence prior to replacement.
Dependencies are inferred from the claim text.