miRNA-Responsive mRNA for High-Purity Cell Sorting
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Solution Overview
Problem
Current cell transplantation therapies using pluripotent stem cells face challenges in achieving high purity of desired tissue cells, as existing methods rely on cell surface markers that are not universally identified for all tissue types.
Innovation Solution
The use of miRNA-responsive mRNAs, specifically designed to target miR-126-3P, miR-126-5P, miR-122-5P, and miR-375, which are introduced into cell populations to selectively sort endothelial, hepatocyte, and insulin-producing cells by exploiting unique miRNA expression profiles, utilizing marker genes like fluorescent proteins or apoptosis-inducing genes for purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cell surface markers are used for sorting, then cell sorting can be performed, but the purity of desired tissue cells cannot be sufficiently increased due to lack of universally identified markers for all tissue types
Solution Approach 1:
The invention changes the sorting parameter from cell surface markers to intracellular miRNA expression profiles. By introducing miRNA-responsive mRNAs that contain target sequences specific to tissue-type-specific miRNAs, the method enables sorting based on miRNA expression levels, achieving high purity sorting for various tissue types including endothelial cells, hepatocytes, and insulin-producing cells without being limited by marker availability
Solution Approach 2:
The invention uses miRNA-responsive mRNA as an intermediary molecule. This mRNA contains a target sequence complementary to specific miRNAs and a marker gene coding sequence. When introduced into cells, it allows detection and sorting of cells based on their miRNA expression levels through fluorescence activation, enabling high purity sorting without direct use of tissue-specific surface markers
2Manufacturing precision
If miRNA-responsive mRNA is introduced into cells, then high purity cell sorting is achieved, but genomic integration risks may occur
Solution Approach 1:
The invention performs the sorting function before any potential genomic integration could occur. By using transient transfection of miRNA-responsive mRNA that degrades naturally over time, the method achieves high purity sorting while avoiding permanent genomic changes. The mRNA provides temporary functionality for sorting without the risks associated with viral vector integration or stable transfection
Solution Approach 2:
The invention uses transiently expressed miRNA-responsive mRNA instead of permanent genomic integration. The mRNA molecules are introduced temporarily, perform their sorting function, and then naturally degrade. This disposable approach achieves the desired sorting purity without the safety risks of genomic integration, eliminating the need for long-term persistence of the sorting reagent in the cells
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
This method allows for the efficient and safe sorting of tissue cells to high purity without genomic integration, enabling their use in transplantation therapies by leveraging the differential expression of specific miRNAs, thereby improving the precision and safety of cell isolation.
Implementation Method 1
the miRNA-responsive mRNA comprising: (i) a nucleic acid sequence recognized specifically by miR-126-3P or miR-126-5P
Data Source
AI summary
An object of the present invention is to provide a method for increasing the purity of a type of tissue cell such as an endothelial cell, a hepatocyte, or an insulin-producing cell. The present invention solves the problem by providing a method comprising a step of introducing, into a cell population, an mRNA comprising a nucleic acid sequence recognized by an miRNA specifically expressed in endothelial cells, hepatocytes, or insulin-producing cells.