Pluripotent Stem Cell Editing for Higher-Purity NK Cell Generation

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Solution Overview

Problem

Existing methods for generating natural killer (NK) cells from pluripotent stem cells are inefficient and can result in the suppression of the patient's immune system, limiting their effectiveness in cancer immunotherapy.

Innovation Solution

Engineering pluripotent stem cells to lack TRIM28 expression and/or activity, combined with additional inhibitors such as EHMT1, to promote the differentiation into CD56+ NK cells, using CRISPR-Cas9 systems and other modulators to manipulate transposable element repression.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If existing methods are used to generate NK cells from pluripotent stem cells, then NK cells can be produced, but the generation efficiency is low and other lineage cells are not sufficiently suppressed

Engineering Contradiction:

ImproveNK cell generation efficiencyVSAvoidlineage specification purity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent removes specific repressors (TRIM28, EHMT1, SETDB1) that normally suppress transposable elements and prevent NK cell differentiation. By extracting these blocking factors, the method enables preferential generation of NK cells while suppressing other lineage cells, thereby improving both productivity and manufacturing precision.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the epigenetic state of pluripotent stem cells by modulating transposable element repression through inhibition of TRIM28, EHMT1, and SETDB1. This parameter change in chromatin accessibility and transcriptional repression enables lineage specification toward NK cells, resolving the contradiction between efficiency and purity.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If pluripotent stem cells are differentiated using conventional methods, then immune cells can be supplied, but the patient's immune system may be suppressed

Engineering Contradiction:

Improveimmune cell supplyVSAvoidimmune system functionality

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies local quality by creating a specific epigenetic environment in pluripotent stem cells through targeted inhibition of repressors. This localized change in transcriptional repression at transposable element loci directs differentiation specifically toward NK cells with enhanced functionality, ensuring both adequate supply and maintained immune system reliability.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If transposable element repression is maintained in pluripotent stem cells, then general differentiation can occur, but NK cell generation is limited

Engineering Contradiction:

Improvedifferentiation capacityVSAvoidNK cell yield

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent inverts the conventional approach by not maintaining repression of transposable elements, but rather actively inhibiting the repressors (TRIM28, EHMT1, SETDB1) that maintain repression. This inversion of the regulatory mechanism unlocks NK cell potential and dramatically increases NK cell yield while preserving controlled differentiation capacity.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS20250354117A1Methods of generating natural killer cells from pluripotent stem cells and compositions thereof

Publication Date: 2025.11.20 CHILDRENS MEDICAL CENT CORP

AI summary

Methods provided herein describe a way to generate NK cells from pluripotent stem cells by disrupting the expression of a gene.