iPS Cell Selection via Luminescent Gene Photon Counting
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Solution Overview
Problem
Current methods for selecting induced Pluripotent Stem (iPS) cells during the reprogramming process lack efficiency in identifying suitable cells for differentiation, which is crucial for regenerative medicine applications.
Innovation Solution
A method involving the culture of cells with combinations of initializing factors labeled with luminescent genes, where the photon number per unit area or time is measured to determine if it exceeds a predetermined threshold, allowing for the selection of cells capable of becoming good iPS cells through luminescence analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If luminescence analysis is used to select iPS cells, then selection precision is improved, but measurement complexity increases
Solution Approach 1:
The patent uses luminescent genes as intermediary markers that are introduced into cells along with initializing factors. These luminescent genes emit light signals that can be detected and measured, serving as a mediator to indirectly assess the expression levels of initializing factors and identify high-quality iPS cells without directly measuring complex molecular expressions.
Solution Approach 2:
The patent employs luminescent genes that produce visible light emission (color change phenomenon) as an indicator of successful reprogramming and initializing factor expression. By detecting the intensity and pattern of luminescence, the system can objectively judge cell quality and select superior iPS cells based on their luminescence characteristics.
2Reliability
If chronological analysis of luminescence amount is performed, then selection objectivity is improved, but measurement time increases
Solution Approach 1:
The patent implements periodic measurement of luminescence amounts at multiple time points during the reprogramming process. By conducting measurements at regular intervals (chronologically), the system captures the dynamic expression patterns of initializing factors, enabling objective assessment of cell differentiation potential while structuring the time investment in a systematic manner.
Solution Approach 2:
The patent uses chronological luminescence measurement data as feedback to evaluate the reprogramming progress and predict iPS cell quality. The measured luminescence patterns over time provide feedback information that allows researchers to objectively judge which cells are likely to become high-quality iPS cells, improving selection reliability.
3Measurement precision
If multiple initializing factors are introduced with luminescent genes, then cell quality assessment accuracy is improved, but process complexity increases
Solution Approach 1:
The patent segments the assessment process by introducing different luminescent genes associated with different initializing factors (e.g., Oct4, Sox2, Klf4, c-Myc). Each luminescent marker can be measured independently, allowing the system to evaluate the expression status of each initializing factor separately and comprehensively assess overall cell quality through combined analysis.
Solution Approach 2:
The patent employs luminescent genes that serve multiple functions: they act as markers for specific initializing factors, provide quantifiable measurement signals, and enable both individual and combined assessment of cell state. This multi-functionality allows accurate quality assessment while using a unified measurement approach for all initializing factors.
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 approach enables precise and efficient selection of high-quality iPS cells by objectively judging the expression patterns of initializing factors, reducing the risk of selecting low-quality cells and enhancing the yield of suitable cells for regenerative medicine.
Implementation Method 1
a luminescent gene (luminescent protein) that emits the same expression amount with the Yamanaka factor
Implementation Method 2
acquiring a photon number per unit area or a photon number per unit time of each of the luminescent genes of the cell
Data Source
AI summary
A selection method of an iPS cell includes: at a reprogramming process to culture a cell including a plurality of combinations of initializing factors labelled with luminescent genes that are different with each other, acquiring a photon number per unit area or a photon number per unit time of each of the luminescent genes of the cell; judging whether the acquired photon number is more than a threshold that is predetermined for the acquired photon number; and when the acquired photon number is more than the threshold, selecting this cell as an objective cell for a next process.