dCas9-Effector System for Stem Cell Differentiation Control
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Solution Overview
Problem
Current methods lack the ability to effectively influence the differentiation status of human pluripotent stem cells and systematically identify factors relevant to stem cell differentiation, limiting the directed differentiation of stem cells into specific lineage pathways.
Innovation Solution
A lentiviral delivery-based dCas9-E/CRISPRe system is employed, using catalytically inactive Cas9 fused with effector domains to regulate gene expression in human embryonic stem cells, enabling targeted activation or repression of specific genomic targets to modulate cell differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lentiviral delivery-based dCas9-E/CRISPRe system is used to regulate gene expression, then the ability to influence differentiation status and identify factors relevant to stem cell differentiation is improved, but the device complexity increases
Solution Approach 1:
The dCas9-E system serves multiple functions: it can activate or repress gene expression, influence cell differentiation status, and enable systematic identification of differentiation factors through a single platform. This multi-functionality resolves the contradiction by making the system adaptable to various differentiation scenarios without proportionally increasing complexity
Solution Approach 2:
The dCas9-E complex acts as an intermediary between guide RNA and target gene promoters, enabling precise transcriptional regulation. This mediator approach allows the system to achieve complex regulatory outcomes through a standardized mechanism, improving versatility without linearly increasing system complexity
2Ease of operation
If catalytically inactive Cas9 fused with effector domains is used to regulate gene expression, then targeted activation or repression of specific genomic targets is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The system divides the gene regulation function into separate modular components: the catalytically inactive Cas9 backbone and interchangeable effector domains. This segmentation allows precise construction of fusion proteins through standardized molecular biology techniques, making the system easier to operate while managing manufacturing precision through modular assembly rather than requiring de novo design of each regulator
3Productivity
If dCas9-effector system is used to modulate transcription in stem cells, then the potential for directing cellular differentiation is improved, but the time required for systematic identification of differentiation factors increases
Solution Approach 1:
The system enables preliminary action by allowing researchers to pre-establish the dCas9-E platform and guide RNA libraries before systematic screening experiments. Once established, the system can rapidly screen multiple differentiation factors in parallel, reducing the overall time required for systematic identification compared to traditional sequential approaches
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
The system successfully drives expression of developmentally relevant genes and induces phenotypic changes, demonstrating its potential for directing cellular differentiation and identifying key regulators in stem cell fate decisions.
Implementation Method 1
The Cas9 nuclease from Streptococcus pyogenes (hereafter, Cas9 or spCas9) can be guided to specific sites in the human genome through base-pair complementation between a 20 nucleotide guide region of an engineered single guide RNA (sgRNA) and a genomic target sequence
Data Source
AI summary
The present disclosure relates to methods of and systems for modifying the transcriptional regulation of stem or progenitor cells to promote their differentiation or reprogramming of somatic cells. Further, the labeling and editing of human genomic loci in live cells with three orthogonal CRISPR/Cas9 components allow multicolor detection of genomic loci with high spatial resolution, which provides an avenue for barcoding elements of the human genome in the living state.