Duckweed Lipid Production via Gene Variant Modulation

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Solution Overview

Problem

Current methods for manipulating carbon partitioning in plants, such as Duckweed, are limited in efficiently redirecting carbon flow from starch to lipids, which is crucial for enhancing biomass production and energy content.

Innovation Solution

Introducing specific gene variants or agents that modulate the expression of key genes involved in starch and lipid biosynthesis, such as AGPS1, AGPL3, GBSSI, APL1, ACCase4, GPAT1, and DGAT2, to inhibit starch production and promote lipid production in Duckweed cultures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If conventional methods are used for manipulating carbon partitioning in plants, then biomass production can be maintained, but lipid production efficiency remains limited

Engineering Contradiction:

Improvelipid productionVSAvoidcarbon partitioning efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent applies parameter changes by introducing gene variants that alter the expression levels of key enzymes in starch and lipid biosynthesis pathways. Specifically, variants of genes such as AGPS1, AGPL3, GBSSI, APL1, ACCase4, GPAT1, and DGAT2 are introduced to modulate metabolic flux, thereby changing the partitioning parameters from starch to lipid production. This enables efficient redirection of carbon flow to enhance lipid accumulation in Duckweed biomass.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If starch production is reduced to increase lipid production, then energy content of biomass improves, but overall carbon fixation may be affected

Engineering Contradiction:

Improveenergy content of biomassVSAvoidstarch production

Core Design Contradiction:

Use of energy by moving objectVSQuantity of substance

Solution Approach 1:

The patent applies local quality by specifically targeting and modifying the metabolic properties of certain cellular pathways while leaving others intact. Gene variants are introduced to selectively inhibit starch biosynthesis enzymes (such as GBSSI and APL1) and enhance lipid biosynthesis enzymes (such as ACCase4, GPAT1, and DGAT2). This creates localized changes in metabolic flux within the cell, redirecting carbon specifically to lipid production without broadly affecting all carbon fixation processes.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies preliminary action by pre-modifying the genetic makeup of Duckweed through introduction of gene variants before initiating carbon partitioning manipulation. The gene variants are stably integrated into the genome, establishing a predisposition for enhanced lipid production capacity. This preliminary genetic modification ensures that when carbon partitioning is manipulated, the metabolic machinery is already optimized for efficient lipid synthesis, thereby improving energy content before the actual carbon redirection process begins.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9909134B2RNA-Seq transcriptome analysis of spirodela dormancy without reproduction and identification of molecular targets useful for improving biomass production for industrial applications

Publication Date: 2018.03.06 RUTGERS THE STATE UNIV

AI summary

Compositions and methods are provided for altering carbon partitioning in biomass isolated from Duckweed.