APOE4 RNA Trans-Splicing Ribozyme for Specific Neuron Targeting
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Solution Overview
Problem
Current treatments for Alzheimer's disease, such as targeting amyloid beta proteins, have shown limited efficacy, and there is a need for a safer and more effective therapeutic approach, particularly focusing on the APOE4 gene, which is a genetic risk factor for the disease.
Innovation Solution
A trans-splicing ribozyme is developed to target APOE4 RNA, specifically designed with an internal guide sequence (IGS) and antisense (AS) regions to bind and replace harmful APOE4 RNA with beneficial RNA, using a neuron-specific promoter and vector for delivery, thereby reducing APOE4 protein expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If trans-splicing ribozyme is used to target APOE4 RNA, then harmful APOE4 protein expression is reduced, but there is risk of off-target effects and immune response
Solution Approach 1:
The ribozyme is divided into distinct functional domains: an internal guide sequence (IGS) for specific RNA binding, a catalytic core for RNA cleavage, and an exon for trans-splicing. This segmentation allows each domain to be optimized independently for specificity and function, reducing off-target effects while maintaining high targeting accuracy to APOE4 RNA
Solution Approach 2:
The ribozyme acts as an intermediary molecule that binds specifically to APOE4 RNA through complementary base pairing in the IGS region, then catalyzes cleavage and trans-splicing reactions. This intermediary mechanism allows precise targeting of APOE4 without directly introducing foreign genes into the host genome, reducing immune response risks
2Reliability
If gene therapy approaches are used to treat Alzheimer's disease, then therapeutic effect may be achieved, but immune response and safety problems occur
Solution Approach 1:
The patent replaces traditional gene therapy approaches (which involve introducing and integrating foreign genes into host cells) with an RNA-level intervention using trans-splicing ribozyme. This substitution operates at the RNA level rather than the genomic DNA level, achieving therapeutic effects while avoiding the immune response and safety issues associated with genomic integration
Solution Approach 2:
The ribozyme is designed to be self-cleaving and self-splicing, containing all necessary catalytic elements within its own structure. Once introduced into the cell, it autonomously binds to APOE4 RNA, catalyzes its cleavage, and performs trans-splicing without requiring additional host factors or complex protein machinery, thereby reducing immune recognition and improving safety
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 ribozyme effectively replaces harmful APOE4 RNA with beneficial RNA, reducing disease risk and improving cognitive function by specifically targeting and altering gene expression in neurons, providing a safer and more effective treatment for Alzheimer's disease.
Implementation Method 1
The IGS region may consist of a nucleotide sequence of 5 to 10 nt in length that may specifically bind to the 5′ UTR region of APOE4 RNA and form a G/U wobble base pair
Implementation Method 2
a group I intron ribozyme from Tetrahmena thermophila targets and then attaches an exon RNA attached to the 3′ end of the ribozyme trans to the 5′ exon in vitro, and thus a trans-splicing reaction that may link with separate transcripts may occur
Data Source
AI summary
The present invention relates to a trans-splicing ribozyme specific to Alzheimer's disease, and a use thereof. The trans-splicing ribozyme replaces RNA of genes that cause or increase the risk of Alzheimer's disease with RNA of genes that are beneficial for the treatment of the disease, thereby reducing the expression of the disease-causing genes and increasing the expression of the genes beneficial for the treatment of the disease, and thus can be usefully used to prevent or treat Alzheimer's disease.