Granted Patent
B2
US 12,371,702 · App. 17/047,946 · Granted Jul 29, 2025
Improving agronomic characteristics in maize by modification of endogenous mads box transcription factors
Inventors:
Shane E Abbitt (Ankeny, IA); Mary J Frank (Des Moines, IA); Shai Lawit (Urbandale, IA); Rosana Melo (St Charles, MO); Mary A Rupe (Altoona, IA); Bo Shen (Johnston, IA); Jingrui Wu (Johnston, IA)
Assignee:
PIONEER HI-BRED INTERNATIONAL, INC.
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Abstract
Genome edited plants, plant cells, seeds and plant parts of maize are provided where expression levels and/or activities of MADS-box transcription factors are modulated to improve one or more agronomic characteristics such as grain yield. Also provided are compositions comprising polynucleotides encoding polypeptides and guide RNAs targeted to endogenous maize MADS-box proteins including for example, targeted site-directed mutagenesis using CRISPR-associated nucleases. Additionally, various methods of employing the polynucleotides and genetic modifications in plants, such as methods for modulating expression level in a maize plant and methods for increasing yield of a maize plant are also provided herein.
Claims (12)
1. A maize plant cell comprising an introduced targeted genetic modification within an endogenous gene that encodes a polypeptide comprising an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 4, wherein the targeted genetic modification is an insertion of a heterologous promoter or an enhancer element at the genomic locus of the endogenous gene and wherein the targeted modification results in an increased expression level of the polynucleotide encoding the polypeptide.
2. The plant cell of claim 1 , wherein the targeted genetic modification is present in (a) the coding region; (b) a non-coding region; (c) a regulatory sequence; (d) an untranslated region; or (e) any combination of (a)-(d) of the gene that encodes the polypeptide.
3. The plant cell of claim 1 , wherein the targeted genetic modification is introduced by a site-specific polynucleotide-guided Cas endonuclease.
4. A maize seed comprising a targeted genetic modification in an endogenous gene that encodes a polypeptide comprising an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 4, wherein the targeted genetic modification is an insertion of a heterologous promoter or an enhancer element at the genomic locus of the endogenous gene, and wherein the targeted modification results in increased expression level of the polynucleotide encoding the polypeptide.
5. The maize seed of claim 4 , wherein the targeted genetic modification is present in (a) the coding region; (b) a non-coding region; (c) a regulatory sequence; (d) an untranslated region; or (e) any combination of (a)-(d) of the gene that encodes the polypeptide.
6. The maize seed of claim 4 , wherein the seed further comprises a polypeptide conferring herbicide tolerance and/or insect resistance.
7. The maize seed of claim 4 , wherein the heterologous promoter is a ZmGOS2 promoter.
8. A method of introducing a site-directed modification within a gene to increase expression level of a polynucleotide, the method comprising:
a. introducing in a regenerable maize plant cell a targeted genetic modification in an endogenous gene that encodes a polypeptide comprising an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 4, wherein the modification is swapping an endogenous promoter element of the endogenous gene at the genomic locus with a heterologous regulatory element; and
b. obtaining the maize plant, wherein the expression level of the encoded polypeptide is increased compared to a control plant.
9. The method of claim 8 , wherein the heterologous regulatory element is a constitutive promoter.
10. The method of claim 8 , wherein the targeted modification is in one or more of the MIKC domains of the polypeptide.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Nov 13, 2020
From: ABBITT, SHANE E; FRANK, MARY J; LAWIT, SHAI; MELO, ROSANA; RUPE, MARY A; SHEN, BO; WU, JINGRUI
To: PIONEER HI-BRED INTERNATIONAL, INC.
Reel/Frame 054364/0541 →
Continuity (4)
Provisional Application
62814373
· Mar 6, 2019
Provisional Application
62741529
· Oct 4, 2018
Provisional Application
62659579
· Apr 18, 2018
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