Feedback-Enabled Synthetic Genes for Dose-Dependent Transgene Control
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Solution Overview
Problem
Current gene therapies for neurodevelopmental disorders like Rett Syndrome suffer from improper or incomplete regulation of gene expression, leading to negative outcomes due to over- or under-expression of gene products in target tissues.
Innovation Solution
Development of feedback-enabled synthetic genes with regulatory regions containing seed matches and flanking sequences that reduce expression in the presence of endogenous miRNAs, integrated into polynucleotide target cassettes and vectors, allowing for dose-dependent inhibitory feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gene therapy vectors are used to treat neurodevelopmental disorders, then gene expression is achieved in target tissues, but improper or incomplete regulation leads to over- or under-expression of gene products
Solution Approach 1:
The patent introduces feedback-enabled synthetic genes that incorporate endogenous miRNA binding sites (seed matches) into their regulatory regions. These sites create a feedback mechanism where the expressed gene product can be regulated by naturally occurring miRNAs in the target tissue, allowing the system to self-regulate expression levels based on cellular conditions without requiring complex external control mechanisms.
Solution Approach 2:
The synthetic genes are designed to utilize the cell's own endogenous miRNA machinery for regulation. By incorporating seed matches that are recognized by naturally present miRNAs, the system enables the target cell to automatically regulate transgene expression through its existing regulatory networks, eliminating the need for engineered complex regulatory proteins or external control systems.
2Reliability
If feedback-enabled synthetic genes with seed matches are inserted into regulatory regions, then transgene expression is reduced in cells expressing endogenous miRNA, but the complexity of the polynucleotide structure increases
Solution Approach 1:
The regulatory region of the synthetic gene is segmented into distinct functional modules: promoter regions, coding regions, and regulatory regions containing specific seed matches. Each segment can be independently designed and optimized. The seed matches are inserted as discrete nucleic acid segments into specific positions within the regulatory region, allowing modular construction and simplifying the design process despite the increased overall complexity.
Solution Approach 2:
The patent applies local quality by inserting seed matches at specific locations within the regulatory region rather than uniformly throughout the polynucleotide. The 5' and 3' flanking sequences neighboring each seed match are specifically designed to optimize miRNA binding affinity and regulation efficiency. This localized modification approach minimizes unnecessary complexity while achieving reliable regulation at critical positions.
3Reliability
If seed matches and flanking sequences are inserted into regulatory regions, then expression is reduced relative to synthetic genes without these segments, but the manufacturing process becomes more complex
Solution Approach 1:
The patent performs preliminary action by pre-identifying and characterizing effective seed matches and their corresponding 5' and 3' flanking sequences before constructing the full synthetic gene. Libraries of validated seed match modules are created and stored, allowing rapid assembly of feedback-enabled genes by simply inserting appropriate pre-characterized modules into the regulatory region, significantly simplifying the manufacturing process compared to de novo design and testing of each regulatory sequence.
Solution Approach 2:
The patent systematically varies parameters such as seed match sequence, 5' flanking sequence length and composition, and 3' flanking sequence characteristics to optimize miRNA binding and regulation. By establishing structure-activity relationships and optimal parameter ranges through preliminary experiments, the patent creates design rules that guide synthetic gene construction, reducing the need for extensive trial-and-error manufacturing while ensuring reliable expression control.
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 solution provides precise regulation of transgene expression, effectively treating disorders by genetically knocking down abnormal gene expression and reducing toxic overexpression, thereby improving treatment efficacy.
Implementation Method 1
one or more nucleic acid segments each comprising a seed match identified as a binding site for an endogenous miRNA and a 5′ flanking sequence and a 3′ flanking sequence neighboring said seed match
Data Source
AI summary
This invention relates to feedback-enabled synthetic genes, polynucleotide target cassettes, vectors, and pharmaceutical compositions for the purpose of providing transgene expression in target tissues that is capable of endogenous regulation for treating disorders such as dose-sensitive intellectual ability disorders, as well as methods of making and methods of using the same.