NIN Gene Cytokinin-Responsive Element Engineering
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Solution Overview
Problem
The inability to fully complement legume nin mutant plants has hindered the understanding of NODULE INCEPTION (NIN) protein's mechanism in nodule organogenesis, limiting the development of effective nodule engineering strategies, as previous attempts to introduce NIN constructs have been unsuccessful in rescuing nodule formation.
Innovation Solution
Introducing cytokinin-responsive elements into the regulatory region of the NIN or NLP coding sequence to enhance the activity of the NIN or NLP protein in response to cytokinin signaling, thereby facilitating complete complementation of nin mutants and understanding NIN regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NIN constructs are introduced into nin mutant plants, then nodule organogenesis should be restored, but previous attempts have consistently failed to complement the mutants
Solution Approach 1:
The regulatory region of the NIN gene is divided into functional modules: a minimal promoter, cytokinin-responsive elements (CREs), and the NIN coding sequence. This segmentation allows independent optimization of each component, enabling successful complementation by providing the necessary cytokinin responsiveness that was missing in previous attempts
Solution Approach 2:
The regulatory region is engineered to change its transcriptional response parameters by incorporating specific cytokinin-responsive elements. This modifies the gene's responsiveness to cytokinin signaling, allowing the NIN protein to be expressed at appropriate levels and times to restore nodule organogenesis in mutant plants
2Ease of manufacture
If the NIN gene regulatory region is simplified for easier manipulation, then genetic engineering becomes more feasible, but the precise mechanism of NIN regulation remains unknown
Solution Approach 1:
Cytokinin-responsive elements serve as intermediary components that bridge the cytokinin signaling pathway and the NIN transcriptional activation. These CREs act as mediators that translate hormonal signals into gene expression changes, enabling both engineering feasibility and mechanistic understanding
Solution Approach 2:
Specific regions of the regulatory sequence are assigned specific functions: the minimal promoter provides basal transcription capability, while inserted cytokinin-responsive elements provide signal-dependent activation. This local functional assignment simplifies the overall structure while preserving and elucidating regulatory mechanisms
Data Source
AI summary
Aspects of the present disclosure relate to genetically modified plants comprising NODULE INCEPTION (NIN) and NIN-LIKE PROTEIN (NLP) that have been genetically altered to be responsive to cytokinin so that the NIN or NLP protein can induce root nodulation upon appropriate signaling.