BCAT Gene Editing to Improve Drought Tolerance in Rice and Soybean
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Solution Overview
Problem
Current technologies have not effectively addressed the issue of enhancing drought tolerance in plants, particularly in rice and soybean, through the regulation of BCAT genes, which are crucial for branched-chain amino acid metabolism, leading to reduced crop yields under drought stress.
Innovation Solution
The use of CRISPR-Cas9 system to create loss-of-function mutants in OsBCAT2 for rice and dual loss-of-function mutants in soybean BCAT1 and BCAT2 genes to inhibit their expression, resulting in enhanced drought tolerance and increased grain yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BCAT gene expression is maintained at normal levels, then branched-chain amino acid metabolism proceeds normally, but drought tolerance is reduced and crop yield decreases under drought stress
Solution Approach 1:
The invention changes the expression level parameter of the BCAT gene by creating loss-of-function mutants through CRISPR-Cas9 genome editing. This parameter change (reducing BCAT expression) leads to accumulation of branched-chain amino acids which improves drought tolerance while maintaining or enhancing crop yield under drought stress conditions
2Reliability
If BCAT gene expression is inhibited to enhance drought tolerance, then survival rate under drought stress improves, but amino acid metabolism is altered
Solution Approach 1:
The invention deliberately changes the amino acid metabolism composition by inhibiting BCAT gene expression. This results in accumulation of branched-chain amino acids (valine, leucine, isoleucine) which actually enhances the plant's ability to cope with drought stress, transforming what could be seen as a destabilization into a beneficial adaptation
Solution Approach 2:
The invention converts the potential harm of altered amino acid metabolism into a benefit. By inhibiting BCAT expression and accumulating branched-chain amino acids, the plant gains enhanced drought tolerance and survival rate, turning a metabolic disruption into a protective mechanism
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
The modified plants exhibit improved drought resistance and yield under stress conditions, with increased accumulation of branched-chain amino acids and enhanced ROS-scavenging capacity, leading to higher survival rates and improved agronomic traits.
Implementation Method 1
The use of CRISPR-Cas9 system to create loss-of-function mutants in OsBCAT2 for rice and dual loss-of-function mutants in soybean BCAT1 and BCAT2 genes to inhibit their expression
Implementation Method 2
plant amino acids play an essential role in minimizing the damage by abiotic stress. So far, proline is best characterized amino acid that accumulates in plant cells to confront a wide range of abiotic stress
Implementation Method 3
The branched-chain amino acid aminotransferase (BCATs, EC 2.6.1.42) is in charge of the final step of BCAA biosynthesis in plastids. BCAT, which belongs to Class IV of the pyridoxal 5′phosphate-dependent aminotransferases, converts Val, Ile, or Leu to α-keto acids
Data Source
AI summary
A method of enhancing tolerance to drought stress in a plant includes inhibiting expression of a gene encoding a protein having the amino acid sequence of SEQ ID NO: 2 or genes encoding BCAT1 protein and BCAT2 protein from soybean having the amino acid sequence of SEQ ID NO: 32 and SEQ ID NO: 34, respectively in a plant cell.