iPSC Clone Selection Platform Using Flow Cytometry Markers
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Solution Overview
Problem
Current iPSC induction methods face challenges such as genetic instability, safety concerns due to gene integration, use of animal-derived culture media, and inefficiency in obtaining stable and reproducible single clones, particularly in autologous and allogeneic cell therapies.
Innovation Solution
A non-genetically modified iPSC induction platform using a minimal combination of reprogramming factors (OCT4, SOX2, E6, E7) with SSEA4 and TRA-1-60 as screening markers and flow cytometry sorting for efficient monoclonal selection, reducing potential carcinogenicity and improving operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If integrated reprogramming methods (retrovirus, lentivirus) are used to introduce reprogramming factors, then reprogramming efficiency is improved, but gene integration into host genome causes genetic instability and potential carcinogenesis
Solution Approach 1:
The patent extracts and removes the integration step from the reprogramming process by using non-integrating viral vectors (adenovirus, Sendai virus) and non-viral methods (plasmids, proteins, small molecules). This allows delivery of reprogramming factors without permanent genomic integration, thereby maintaining genetic stability while achieving efficient reprogramming.
Solution Approach 2:
The patent uses intermediary carriers such as adenoviral vectors, Sendai virus, plasmids, and small molecule compounds to deliver reprogramming factors temporarily. These intermediaries facilitate efficient gene delivery and expression without integrating into the host genome, serving as a bridge between high efficiency and genetic safety.
2Ease of manufacture
If physical methods are used to obtain single clones during isolation, then clone separation is achieved, but the method cannot guarantee single cell origin and may introduce undifferentiated cells
Solution Approach 1:
The patent replaces mechanical/physical isolation methods with flow cytometry-based sorting. This optical and electronic system uses fluorescent markers (SSEA4, TRA-1-60) to identify and sort single cells with high precision, ensuring each isolated clone originates from a single cell while excluding undifferentiated cells based on their surface marker expression patterns.
Solution Approach 2:
The patent employs fluorescent markers (SSEA4, TRA-1-60) that exhibit color changes or fluorescence signals to identify pluripotent stem cells. Flow cytometry detects these optical properties to precisely sort single cells, enabling visual and quantitative identification of cell state without physical manipulation that could compromise cell integrity.
3Adaptability or versatility
If a large number of reprogramming factors are used, then reprogramming completeness is improved, but safety is reduced due to increased potential for gene mutations and carcinogenesis
Solution Approach 1:
The patent extracts only the essential reprogramming factors needed for successful reprogramming, removing unnecessary factors that increase risk. By identifying and using a minimal core set of factors (such as OCT4, SOX2, KLF4, c-MYC combinations), the method achieves complete reprogramming while minimizing exposure to potential carcinogenic elements.
Solution Approach 2:
The patent applies partial action by using a reduced set of reprogramming factors rather than the full complement traditionally employed. This selective approach uses only the necessary factors for successful reprogramming, avoiding excessive factor delivery that would increase mutagenic risk while still achieving complete cellular reprogramming.
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 platform achieves high induction efficiency with reduced carcinogenic risk, enabling stable and reproducible production of single iPSC clones suitable for industrial applications.
Implementation Method 1
uses flow cytometry sorting technology, sorting individual cells with positive characterization
Data Source
AI summary
Disclosed is an efficient and non-genetically modified iPSC-induced, industrialized single clone selection platform, and a use. The platform can efficiently perform reprogramming, and only requires the use of a minimal number of reprogramming factors (OCT4, SOX2, E6, E7). During the single clone separation stage of the present invention, SSEA4/TRA-1-60 is used as a screening marker, and a large number of single cell clones are obtained by means of flow cytometry. The platform described in the present invention has advantages such as high reprogramming efficiency, high safety, easy operation, and large-scale production.