Advanced genome editing
Methods of genetically modifying microorganisms using advanced genome editing are disclosed. Methods of modifying the genome of these microorganisms for point mutations, deletions, and DNA insertions are also disclosed. Further, inhibiting expression of genes without manipulating the genome of the microorganism is disclosed. In some cases, the microorganism can be a methylotroph, e.g., a methanotroph.
1. A genetically-modified microorganism capable of converting a methane to a multicarbon product, wherein the genetically-modified microorganism is a Methylococcus capsulatus and comprises a polynucleotide encoding a heterologous CRISPR-associated protein, the polynucleotide operably linked to a weak promoter.
2. The genetically modified microorganism of claim 1 , wherein the CRISPR-associated protein is a Streptococcus pyogenes CRISPR-associated protein 9 (Cas9).
3. The genetically-modified microorganism of claim 1 , wherein the heterologous CRISPR-associated protein is expressed within by way of a plasmid that comprises a weak promoter.
4. The genetically-modified microorganism of claim 1 , further comprising a polynucleotide encoding a gRNA.
5. The genetically-modified microorganism of claim 4 , wherein the polynucleotide encoding a gRNA comprises a 10 nucleotide sequence that is identical to a 10 nucleotide sequence portion of a promoter, intron, or coding sequence of an rpoB gene or a gene within a pathway for the production of 2,3-butanediol (2,3-BDO), 1,4-butanediol (1,4-BDO), isobutyraldehyde, or isobutanol.
6. The genetically-modified microorganism of claim 1 , wherein the genetically-modified microorganism comprises: a point mutation compared to a wild-type microorganism of the same species; or a point mutation, deletion, or addition of one or more nucleotides within a promoter, intron, or coding sequence of an rpoB gene or a gene within a pathway for the production of 2,3-butanediol (2,3-BDO), 1,4-butanediol (1,4-BDO), isobutyraldehyde, or isobutanol.
7. The genetically-modified microorganism of claim 1 , further comprising a donor polynucleotide.
8. The genetically-modified microorganism of claim 7 , wherein the donor polynucleotide comprises fewer than 1000 bases.
9. The genetically-modified microorganism of claim 1 , wherein the weak promoter is pBAD, J23110, lacO, J23116, J23106, J23105, J23108, J23107, J23115, J23114, or a mutant pMxaF.
10. The genetically-modified microorganism of claim 1 , wherein the weak promoter is a mutant pMxaF comprising the sequence SEQ ID NO: 78.
11. The genetically-modified microorganism of claim 2 , wherein the weak promoter is a mutant pMxaF comprising the sequence SEQ ID NO: 78.
12. The genetically-modified microorganism of claim 4 , wherein the polynucleotide encoding the gRNA is operably linked to a strong promoter.
13. The genetically-modified microorganism of claim 12 , wherein the strong promoter is pMxaF, J2311, J12100, or J23102.
14. The genetically-modified microorganism of claim 4 , wherein the genetically-modified microorganism is prepared by transforming a microorganism with the polynucleotide encoding a gRNA before the microorganism is transformed with the polynucleotide encoding a heterologous CRISPR-associated protein.
15. The genetically-modified microorganism of claim 7 , wherein the genetically-modified microorganism is prepared by transforming a microorganism with the polynucleotide expressing a donor DNA before the microorganism is transformed with the polynucleotide encoding a heterologous CRISPR-associated protein.
16. The genetically-modified microorganism of claim 1 , wherein the genetically-modified microorganism is prepared by transforming a microorganism with a polynucleotide encoding a gRNA and expressing a donor DNA before the microorganism is transformed with the polynucleotide encoding a heterologous CRISPR-associated protein.
17. The genetically-modified microorganism of claim 16 , wherein the CRISPR-associated protein is operably linked to a weak promoter that is pBAD, J23110, lacO, J23116, J23106, J23105, J23108, J23107, J23115, J23114, or a mutant pMxaF.
18. The genetically-modified microorganism of claim 16 , wherein the CRISPR-associated protein is Cas9.
19. The genetically-modified microorganism of claim 18 , wherein the CRISPR-associated protein is operably linked to a mutant pMxaF comprising the sequence SEQ ID NO: 78.