Pluripotency Gene Testing With HFF Reference Cells for RT-qPCR Standardization
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Solution Overview
Problem
Current methods for testing pluripotency gene expression levels, such as fluorescence quantitative PCR, lack a universal reference product and are not suitable for standardizing the evaluation of pluripotency gene expression due to variability in human embryonic stem cell cultures, making it difficult to establish a unified standard for pluripotency assessment.
Innovation Solution
A method utilizing human foreskin fibroblasts (HFF) cells as a reference cell with stable pluripotency gene expression, combined with RT-qPCR, to quantify OCT4 and NANOG genes, using specific primer and probe sequences, and enhancing genome removal processes to ensure accurate RNA extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If human embryonic stem cells (hESCs) are used as reference cells for testing pluripotency gene expression levels, then the expression levels can be measured, but the expression levels vary greatly under different culture conditions making them unsuitable as a unified standard
Solution Approach 1:
The patent replaces expensive, difficult-to-obtain hESCs with readily available human foreskin fibroblasts (HFF) as reference cells. HFF cells are easy to obtain, maintain stable low expression levels of OCT4 and NANOG genes across different culture conditions, and can be used as a universal reference standard for pluripotency gene expression testing without the variability problems of hESCs
2Measurement precision
If fluorescence quantitative PCR technology is used for detecting pluripotency gene expression levels, then specificity and sensitivity are improved, but the absence of a universal reference product makes standardization difficult
Solution Approach 1:
The patent establishes HFF cells as a universal reference product that can be applied across different laboratories and testing scenarios for pluripotency gene expression assessment. This single reference cell line provides a common baseline for comparing OCT4 and NANOG expression levels in various cell types including hPSCs, differentiated cells, and cell therapy products, enabling standardized evaluation across the field
3Ease of manufacture
If human foreskin fibroblasts (HFF) cells are used as reference cells, then ease of obtaining and stability of low expression levels are improved, but this approach needs to be validated for universal applicability
Solution Approach 1:
The patent validates HFF cells as a universal reference by systematically comparing their performance against the requirements for reference cells: confirming they maintain stably low OCT4 and NANOG expression levels, are easily obtained and cultured, and provide reliable baseline values for detecting pluripotency in various cell types. This feedback validation process establishes confidence in their universal applicability
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
Provides a simple, stable, and standardizable method for evaluating pluripotency gene expression levels, offering high sensitivity and a unified standard for assessing pluripotency in human pluripotent stem cells and characterizing their differentiation processes.
Implementation Method 1
fluorescence quantitative PCR technology
Implementation Method 2
RT-PCR technology and fluorescence quantitative PCR technology
Data Source
AI summary
The present invention relates to the use of a reference cell for testing pluripotency gene expression level, wherein the reference cell is selected from cells with low and stable expression level of a pluripotency gene. Preferably, the reference cell is selected from HFF cells, optionally, the pluripotency gene is selected from OCT4, NANOG. The present invention also relates to primers and probes for OCT4 and NANOG. The present invention also relates to a method for testing pluripotency gene expression level. The present invention further relates to a use of the detection method in detecting a hPSC residue level and characterizing a hPSC differentiation process. The method of the present invention has the advantages of simplicity, stability, high sensitivity, wide application range, and high accessibility. Therefore, it is easy to standardize and can provide a unified standard for testing cell pluripotency gene expression level.