Potato Starch Amylose Reduction via GBSS Gene Mutation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The starch industry faces challenges in processing potato starch due to the costly separation of amylopectin and amylose, as existing methods are energy-intensive and not economically viable, with only 5% of global starch supply coming from potatoes, which have a high amylose content.
Innovation Solution
Creating potato varieties with reduced granule-bound starch synthase (GBSS) activity using sequence-specific nucleases to introduce targeted mutations in the GBSS gene, resulting in starch with lower amylose and higher amylopectin content, without the use of transgenesis, thus avoiding regulatory classification as genetically modified.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sequence-specific nucleases are used to create targeted mutations in GBSS gene, then amylose content is reduced and starch is enriched in amylopectin, but the complexity of the breeding process increases
Solution Approach 1:
The patent segments the GBSS gene into specific target sequences that can be recognized and cut by sequence-specific nucleases. By dividing the gene into recognizable segments with specific nucleotide sequences, the nuclease can precisely target and mutate only the GBSS gene without affecting other genes, thereby reducing amylose content while maintaining a relatively simple and controlled breeding process.
Solution Approach 2:
The patent uses sequence-specific nucleases as intermediaries to achieve targeted mutation. These nucleases act as mediators that recognize specific DNA sequences in the GBSS gene and introduce mutations at precise locations. This intermediary approach allows for controlled gene modification without requiring complex transgenic methods, thus reducing amylose content while avoiding the regulatory classification of genetically modified organisms.
2Quantity of substance
If transgenic methods are used to modify GBSS gene, then starch composition can be controlled, but the potatoes are classified as genetically modified crops requiring regulatory approval
Solution Approach 1:
The patent extracts the foreign DNA component from the modification process by using sequence-specific nucleases that are designed to recognize and cut endogenous GBSS gene sequences. The nucleases introduce mutations directly into the plant's own genome without integrating foreign transgenic DNA. This extraction of the transgenic element allows for controlled starch composition while avoiding regulatory classification as genetically modified crops.
Solution Approach 2:
The patent employs the plant's own cellular machinery and endogenous DNA sequences to achieve the desired modification. The sequence-specific nucleases target and mutate the GBSS gene within the plant's native genome, and the plant's natural repair mechanisms complete the mutation process. This self-service approach eliminates the need for foreign DNA integration, enabling starch composition control while maintaining regulatory acceptability as non-GM crops.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the production of potato varieties with improved starch characteristics suitable for industrial purposes, reducing amylose levels by 10-100% and maintaining high amylopectin levels, making starch processing more efficient and economically viable.
Implementation Method 1
contacting a population of S. tuberosum plant cells comprising a functional GBSS allele with a rare-cutting endonuclease targeted to an endogenous GBSS sequence
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Materials and methods for making plants (e.g., Solanum varieties) with decreased levels of amylose are provided herein. The methods can include making mutations in the gene encoding granule bound starch synthase (GBSS), where the mutations are induced using a rare-cutting endonuclease.