Expression modulating elements and use thereof
The disclosure relates to gene expression modulation elements from plants and their use in modulating the expression of one or more heterologous nucleic acid fragments in plants. The disclosure further discloses compositions, polynucleotide constructs, transformed host cells, plants and seeds containing the expression modulating elements, and methods for preparing and using the same.
1. A method of modulating expression of an endogenous polynucleotide in a plant cell, the method comprising altering one or more nucleotides in a regulatory region of the endogenous polynucleotide such that the regulatory region of the polynucleotide comprises an expression modulating element having at least one copy of a polynucleotide sequence selected from the group consisting of SEQ ID NOS: 1, 2, 40 and 41.
2. The method of claim 1 , wherein the alteration of one or more nucleotides is by genome modification.
3. The method of claim 1 , wherein the expression modulation element is present within about 10 to about 5000 bp from a transcriptional start site of the endogenous polynucleotide.
4. The method of claim 1 , wherein the expression modulation element further comprises additional copies of the expression modulating element such that about 2× to 10× copies of the expression modulating elements are present in the regulatory region of the endogenous polynucleotide.
5. The method of claim 4 , wherein the additional copies of the expression modulating element are present in one or more of the configurations selected from the group consisting of: head to head, head to tail, tail to head, tail to tail, and a combination thereof.
6. The method of claim 4 , wherein the additional copies are separated by a spacer sequence.
7. The method of claim 1 , wherein the expression modulating element is plant-derived and is heterologous to the endogenous polynucleotide.
8. The method of claim 4 , wherein the additional copies of the expression modulating element is created by altering no more than 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 27, 38, 39 or 40 nucleotides in the regulatory region of the endogenous polynucleotide.
9. The method of claim 1 , wherein the expression modulating element is located upstream of the transcriptional start site of the endogenous polynucleotide.
10. The method of claim 1 , wherein the expression of the endogenous polynucleotide is increased in the plant cell compared to a control plant cell not comprising the expression modulation element operably linked to the endogenous polynucleotide.
11. The method of claim 1 , wherein the plant cell is maize, rice, soybean, sunflower, wheat, canola or sorghum.
12. The method of claim 1 , wherein the endogenous polynucleotide is involved in drought tolerance, disease resistance, herbicide tolerance, pest resistance, yield increase, yield stability, nitrogen utilization efficiency or a combination thereof.
13. The method of claim 2 , wherein the genome modification is (a) a site-specific double strand break (DSB) mediated by a polynucleotide-guided endonuclease, zinc finger nuclease, a transcription activator-like effector nuclease (TALEN), polynucleotide-guided recombinase or engineered site-specific meganucleases, or Argonaute or (b) a site-specific base edit mediated by an C⋅G to T⋅A or a A⋅T to G⋅C base editing deaminase enzymes.
14. The method of claim 1 , wherein the expression modulating element is operably linked to a heterologous minimal core promoter.