Insect Gene Expression via Alternative Splicing Control
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Solution Overview
Problem
Current methods for expressing functional proteins in insects lack efficient mechanisms for sex-specific and stage-specific regulation, particularly in developmental processes, and are associated with defects linked to human disorders.
Innovation Solution
A gene expression system utilizing sex-specific alternative splicing with splice control sequences, including a protein binding domain with a specific DNA consensus sequence, to regulate the expression of functional proteins in insects, allowing for sex-specific and stage-specific mediation of protein expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional gene expression systems are used in insects, then protein expression can be achieved, but sex-specific and stage-specific regulation is lacking
Solution Approach 1:
The gene expression system is segmented into distinct functional modules: a promoter region, a coding sequence, and multiple intronic splice control sequences (ISSCS). Each ISSCS contains specific splice site sequences (5'-GT...AG-3') and regulatory elements that can independently function to control splicing. This modular segmentation enables flexible combination of different regulatory elements to achieve sex-specific and stage-specific expression patterns.
Solution Approach 2:
Intronic splice control sequences act as intermediary elements between the promoter and the coding sequence. These ISSCS sequences mediate the regulation of gene expression by controlling alternative splicing events, thereby determining whether the coding sequence is included or excluded from the final mRNA transcript based on sex and developmental stage.
2Reliability
If alternative splicing is used for regulation, then protein expression can be controlled, but defects linked to human disorders may occur
Solution Approach 1:
The system utilizes controlled changes in splicing parameters through the introduction of specific intronic splice control sequences. By modifying the splicing parameters (presence/absence of ISSCS, splice site sequences, and regulatory elements), the system achieves reliable sex-specific and stage-specific expression while maintaining proper splicing fidelity to prevent defects.
Solution Approach 2:
The splice control sequences are designed to self-regulate splicing decisions based on the cellular environment. The ISSCS elements contain intrinsic sequences (5'-GT...AG-3') that automatically interact with the splicing machinery to ensure accurate splicing outcomes without requiring external correction mechanisms, thereby preventing splicing defects.
3Productivity
If existing sterilization techniques like SIT are used, then population control can be achieved, but environmental and operational drawbacks exist
Solution Approach 1:
The patent replaces mechanical/physical sterilization methods (such as irradiation used in SIT) with a molecular/biological control mechanism. Instead of using physical agents to sterilize insects, the system uses genetically engineered alternative splicing to produce functional or non-functional proteins that control reproduction, thereby simplifying operational procedures and reducing environmental impact.
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
Enables precise regulation of protein expression, achieving functional protein production with lethal or therapeutic effects, such as sterilization, without the drawbacks of existing techniques like the Sterile Insect Technique, by using a system that can be controlled environmentally or through specific conditions.
Implementation Method 1
Spliceosomes are large complexes of small nuclear RNA and protein particles (snRNPs) which assemble with pre-mRNA to achieve RNA splicing, by removing introns from eukaryotic nuclear RNAs
Implementation Method 2
Alternative splicing involves the removal of one or more introns and ligation of the flanking exons. This reaction is catalyzed by the spliceosome
Data Source
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AI summary
A polynucleotide expression system is provided that is capable of alternative splicing of RNA transcripts of a polynucleotide sequence to be expressed in an organism.