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Compositions and methods for modulating expression of gene products

a technology of gene products and expression, applied in the field of gene function modulation, can solve the problems of increasing the regulatory burden for sequence and expression confirmation, increasing the risk of undesirable rearrangements and deletions, and occupying valuable space, so as to improve the characteristics of commercially important plants and plant parts, the effect of reducing expression and function

Inactive Publication Date: 2007-03-29
PIONEER HI BRED INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The compositions and methods of the invention are useful for decreasing expression and function of gene products of interest, thereby altering the phenotype of an organism or cell of interest. In some embodiments, the construct can be used to improve characteristics of commercially important plants and plant parts. Thus, the compositions and methods can be used to improve the yield and quality of desirable plant products thereby improving agronomic efficiency. In other embodiments, genes that are indicative of disease states in a mammal, such as cancer genes, may be targeted.

Problems solved by technology

This approach takes up valuable space in a molecular stack, increasing the regulatory burden for sequence and expression confirmation, as well as, the potential for undesirable rearrangements and deletions.
Currently available promoters, particularly tissue-preferred promoters, may not cover the entire temporal range of expression need to achieve the trait goals.

Method used

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  • Compositions and methods for modulating expression of gene products
  • Compositions and methods for modulating expression of gene products
  • Compositions and methods for modulating expression of gene products

Examples

Experimental program
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Effect test

example 1

Suppression Cassette Provides for Differential Promoter Expression of Reversibly Glycosylated Polypeptide-1 (RGP1)

[0146] The maize RGP1 gene encodes a polypeptide that is involved in hemicellulose production (see, for example, U.S. Pat. No. 6,194,638, herein incorporated by reference in its entirety). An inverted repeat comprising a sense and antisense sequence of the maize RGP1 gene was created using standard molecular biology protocols. A 277 base pair (bp) HindIII-Apal fragment from the 5′ end of the RGP1 coding sequence was ligated into a cloning intermediate. This plasmid was restriction digested, the end filled in with Klenow enzyme, and then digested with a second restriction enzyme. Into this backbone, a second fragment of RGP1 (an 848 bp BamHI / HpaI fragment, also from the 5′ end of the coding sequence) was ligated, such that the second fragment was in reverse orientation relative to the first fragment. The suppression cassette was created by moving the promoter from the ma...

example 2

Maize Transformation

[0154] Immature maize embryos from greenhouse donor plants are bombarded with a plasmid containing the suppression cassette and the selectable marker gene PAT (Wohlleben et al. (1988) Gene 70:25-37), which confers resistance to the herbicide Bialaphos. Alternatively, the selectable marker gene is provided on a separate plasmid. Transformation is performed as follows.

[0155] The ears are husked and surface sterilized in 30% Clorox bleach plus 0.5% Micro detergent for 20 minutes, and rinsed two times with sterile water. The immature embryos are excised and placed embryo axis side down (scutellum side up), 25 embryos per plate, on 560Y medium for 4 hours and then aligned within the 2.5 cm target zone in preparation for bombardment.

[0156] A plasmid vector comprising the suppression cassette described above and the selectable marker gene PAT is made. This plasmid DNA plus plasmid DNA containing a PAT selectable marker is precipitated onto 1.1 μm (average diameter) t...

example 3

Agrobacterium-mediated Transformation

[0162] For Agrobacterium-mediated transformation of maize with the suppression cassette, the method of Zhao is employed (U.S. Pat. No. 5,981,840, and PCT patent publication WO98 / 32326; the contents of which are hereby incorporated by reference). Briefly, immature embryos are isolated from maize and the embryos contacted with a suspension of Agrobacterium, where the bacteria are capable of transferring the suppression cassette of the invention to at least one cell of at least one of the immature embryos (step 1: the infection step). In this step the immature embryos are immersed in an Agrobacterium suspension for the initiation of inoculation. The embryos are co-cultured for a time with the Agrobacterium (step 2: the co-cultivation step). The immature embryos are cultured on solid medium following the infection step. Following this co-cultivation period an optional “resting” step is contemplated. In this resting step, the embryos are incubated in...

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Abstract

Compositions and methods for modulating expression of gene products are provided. Compositions comprise suppression cassettes that comprise a convergent promoter pair operably linked to a silencing element that, upon expression, is capable of decreasing the expression of one or more target polynucleotides of interest. Compositions of the invention also include transformed plants, plant cells, plant tissues, and plant seeds. Methods of transformation and regeneration of plants comprising the novel constructs are provided. The methods find use in regulating gene expression, particularly genes associated with agronomic traits of interest. Further provided are promoter sequences, cells, plants, and vectors comprising these promoter sequences and methods of their use.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60 / 712,354, filed on Aug. 30, 2005, herein incorporated by reference in its entirety.FIELD OF THE INVENTION [0002] The present invention is drawn to the field of genetics and molecular biology. More particularly, the compositions and methods are directed to modulation of gene function. BACKGROUND OF THE INVENTION [0003] RNA interference (RNAi) is a phenomenon in which small double-stranded RNA molecules induce sequence-specific degradation of homologous single-stranded RNA. RNAi has been used as a tool to degrade mRNA in cells to shut down the effect of specific genes in many cell-types. In this approach to control gene expression, double-stranded RNAs that are complimentary to known mRNA's are introduced into a cell to specifically target and destroy that particular mRNA. Once double stranded RNA (dsRNA) enters the cell, it is cleaved by a ribonuclease enzyme, dice...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01H1/00C07H21/04C12N15/82C12N5/04
CPCC12N15/8216C12N15/8218C12N15/8222C12N15/113C12N15/8235C12N15/8245C12N15/8246C12N15/8234
Inventor GRUIS, DARREN B.HASTINGS, CRAIG
Owner PIONEER HI BRED INT INC
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