TSC2 Base Editing in Mesenchymal Stem Cells With High Precision

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Solution Overview

Problem

Current methods for delivering CRISPR-Cas9 components to human mesenchymal stem cells (hMSCs) face challenges in achieving substantial gene editing efficiency of Tuberous sclerosis complex 2 (TSC2) SNPs while minimizing off-target editing and cell toxicity.

Innovation Solution

A method involving the introduction of a Cas component, guide RNA (gRNA), and homology directed repair (HDR) template into a pool of sample cells, followed by culturing and selection to generate genomically engineered cells with at least 35% carrying a TSC2 gene mutation, using optimized delivery methods like lipofection or electroporation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If CRISPR-Cas9 components are delivered to hMSCs using conventional methods, then gene editing can be performed, but editing efficiency is low and off-target effects increase

Engineering Contradiction:

Improvegene editing efficiencyVSAvoidoff-target editing effects

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes delivery parameters including electroporation voltage (e.g., 250V), pulse duration (e.g., 5ms), and CRISPR component concentrations to achieve high editing efficiency while minimizing off-target effects. The HDR template design with optimized homology arm lengths (e.g., 90bp) further refines editing precision.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses electroporation as an intermediary delivery method to introduce CRISPR-Cas9 components and HDR templates into hMSCs. This physical mediation enables efficient nuclear delivery while controlling cellular stress responses to reduce off-target effects and maintain cell viability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If CRISPR-Cas9 components are delivered to hMSCs, then TSC2 gene editing can be achieved, but cell viability decreases

Engineering Contradiction:

Improveediting efficiencyVSAvoidcell viability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent performs preliminary optimization of delivery conditions including pre-warming electroporation buffers, optimizing cell confluence (70-80%), and pre-incubating CRISPR components to reduce cellular stress. HDR templates are designed with optimized homology regions to facilitate efficient repair before cell stress becomes detrimental.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements cushioning measures including adding antioxidants to culture media, using viability-optimized electroporation parameters, and providing extended recovery periods post-delivery. These preemptive measures protect cells from excessive stress while maintaining high editing efficiency.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Manufacturing precision

If HDR templates are used for precise editing, then mutation accuracy increases, but delivery complexity increases

Engineering Contradiction:

Improvemutation precisionVSAvoiddelivery system complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent segments the delivery system into separate components: Cas9 protein, gRNA, and HDR template delivered independently via electroporation. This segmentation allows optimization of each component's delivery parameters and simplifies the overall process by avoiding the need for complex viral vectors or multi-step protocols.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent optimizes HDR template parameters including homology arm length (e.g., 90bp), GC content, and sequence composition to maximize editing precision. Electroporation parameters (voltage, pulse duration, number of pulses) are systematically optimized to deliver these complex templates efficiently without excessive complexity.

Inventive Principle:

Principle #35Parameter changes

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 achieves precise and efficient editing of TSC2 genes in hMSCs, maintaining cell viability and minimizing off-target effects, with editing efficiencies up to 85% and low off-target activity.

Implementation Method 1

a guide RNA (gRNA) directed to a gRNA target

Methodology Applied

Scientific EffectComplementary base pairing:

Implementation Method 2

introducing into the pool of sample cells a Cas component, a guide RNA (gRNA) directed to a gRNA target, and a homology directed repair (HDR) template

Methodology Applied

Scientific EffectHomologous recombination:

Data Source

PatentUS20250354178A1CRISPR/Cas9-BASED BASE EDITING OF TUBEROUS SCLEROSIS COMPLEX 2 GENE IN MESENCHYMAL STEM CELLS

Publication Date: 2025.11.20 UNIV OF MARYLAND

AI summary

A method of inducing SNP mutations in mesenchymal stem cells (MSCs), targeting the most frequent SNP mutations of the TSC2 gene, TSC2.1864C>T (p.Arg622Trp), TSC2.1832 G>A (p.Arg611Glu), and TSC2.5024 C>T (p.Pro1675Leu) using delivery methods for CRISPR components, is described. A high editing efficiency (up to 85%) for inducing TSC2 SNP mutations in MSCs using lipofectamine-based transfection was achieved. Overall, the high editing efficiency of some TSC2 mutations enables the induction and reversal of mutations in primary hMSCs without requiring the resource-consuming derivation of cell lines that are frequently distinct from their primary counterparts.