iPS Cell Reprogramming Using DLX4, OCT3/4, and SOX2 Genes

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Solution Overview

Problem

Current methods for producing induced pluripotent stem cells (iPS cells) using traditional nuclear reprogramming factors, such as c-MYC, pose risks of tumor formation, and there is a need for alternative combinations that enhance induction efficiency while minimizing these risks.

Innovation Solution

A method involving the use of a novel combination of nuclear reprogramming substances, including the DLX4 gene, OCT3/4 gene, and SOX2 gene, which are brought into contact with dental pulp cells, particularly before the stage of tooth root formation, to produce iPS cells with superior induction efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional nuclear reprogramming factors including c-MYC are used to produce iPS cells, then induction efficiency is achieved, but tumor formation risk increases

Engineering Contradiction:

ImproveiPS cell induction efficiencyVSAvoidtumor formation risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The invention extracts and removes the harmful c-MYC factor from the traditional reprogramming combination while retaining the essential induction capability through alternative factors (OCT3/4, SOX2, KLF4, and LIN28), thereby eliminating tumor formation risk while maintaining iPS cell induction efficiency

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the compositional parameters of the reprogramming factor combination by substituting c-MYC with LIN28 and optimizing the combination of OCT3/4, SOX2, KLF4, and LIN28, achieving both safe and efficient iPS cell production

Inventive Principle:

Principle #35Parameter changes

2Reliability

If alternative nuclear reprogramming factors are used to avoid tumor risk, then safety is improved, but induction efficiency may decrease

Engineering Contradiction:

Improvesafety of iPS cell productionVSAvoidiPS cell induction efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention creates a composite reprogramming system combining four specific factors (OCT3/4, SOX2, KLF4, and LIN28) that work synergistically to achieve both high safety and high induction efficiency, overcoming the limitations of individual factor substitutions

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention utilizes LIN28, a factor that is naturally highly expressed in dental pulp cells, to enhance the reprogramming efficiency without external intervention, achieving safe and efficient iPS cell production from the target cell type

Inventive Principle:

Principle #25Self-service

3Productivity

If dental pulp cells before tooth root formation are used as target cells, then induction efficiency is enhanced, but cell availability may be limited

Engineering Contradiction:

ImproveiPS cell induction efficiencyVSAvoidcell availability

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The invention identifies and targets dental pulp cells at a specific developmental stage (before tooth root formation) where DLX4 and LIN28 are naturally highly expressed, preparing the cells in advance with optimal endogenous factor levels to enhance reprogramming efficiency when reprogramming factors are introduced

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3040416B1Method for producing induced pluripotent stem cells

Publication Date: 2019.05.01 GIFU UNIVERSITY

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AI summary

The teachings disclosed in the specification comprise introducing a nuclear reprograming substance (DLX4 gene, OCT3/4 gene and SOX2 gene) into contact with a cell and thereby producing iPS cells