Synthetic Intergenic Sequence Regions for Transgene Cassette Isolation
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Solution Overview
Problem
The interaction between expression cassettes in a vector stack can alter the intended expression pattern of transgenes in plants, leading to unintended phenotypes, particularly in seed-specific expression, which is a challenge in plant biotechnology.
Innovation Solution
Incorporation of novel synthetic Intergenic Sequence Regions (ISRs) between transgene cassettes to minimize their interaction, maintaining the intended expression pattern and level of each cassette.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transgene cassettes are cloned into a single vector stack to introduce several agronomic traits, then breeding efficiency is improved and cost is reduced, but expression elements from one cassette may alter the expression profile of another cassette
Solution Approach 1:
The patent introduces Intergenic Sequence Regions (ISRs) as intermediary DNA elements positioned between adjacent transgene cassettes in a vector stack. These ISRs act as buffer zones that physically separate expression elements from different cassettes, preventing unwanted interactions while maintaining the compact multi-cassette structure. The ISRs contain specific cis-acting elements that block the spread of enhancer effects and prevent promoter interference, thereby preserving the intended expression profiles of each transgene cassette.
Solution Approach 2:
The patent segments the vector stack by dividing it into distinct functional units separated by ISRs. Each transgene cassette is isolated as an independent expression module with its own regulatory elements, prevented from interfering with neighboring cassettes by the ISR boundaries. This segmentation allows multiple cassettes to coexist in a single vector without mutual interference, maintaining both breeding efficiency and expression reliability.
2Adaptability or versatility
If a seed-specific expression cassette is placed in a vector stack with other expression cassettes, then tissue-specific expression is achieved, but interaction with neighboring expression elements may alter the seed-specific expression pattern to a more constitutive pattern
Solution Approach 1:
The patent places ISRs as protective intermediaries flanking the seed-specific expression cassette within the vector stack. These ISRs contain cis-acting elements that specifically block the influence of neighboring expression elements, preventing the seed-specific expression pattern from being altered to a constitutive pattern. The ISRs act as molecular shields that preserve the precision of tissue-specific expression while allowing the cassette to function within a multi-cassette vector stack.
Data Source
AI summary
The invention provides recombinant DNA molecules comprising novel synthetic Intergenic Sequence Regions for use in plants to reduce the interaction of a first transgene expression cassette on a second transgene cassette when inserted between the first transgene cassette and second transgene cassette. The invention also provides transgenic plants, plant cells, plant parts, and seeds comprising the novel synthetic Intergenic Sequence Regions. The invention also provides methods to reduce the interaction between transgene expression cassettes using the novel synthetic Intergenic Sequence Regions.