Exploring the Functional Heterogeneity of Directly Reprogrammed Neural Stem Cell-Derived Neurons via Single-Cell RNA...

Area of Science:

• Stem cell biology
• Neuroscience
• Regenerative medicine

Background:

• Directly reprogrammed neural stem cells (iNSCs) offer therapeutic potential for neurodegenerative diseases.
• Reducing tumorigenicity of pluripotent stem cells is key for iNSC safety.
• Cellular heterogeneity in iNSCs poses challenges for clinical application quality control.

Purpose of the Study:

• To investigate the functional heterogeneity of iNSCs and iNSC-derived neurons.
• To identify cell fate regulators during direct reprogramming and neuronal differentiation.
• To establish quality control measures for iNSCs in regenerative therapy.

Main Methods:

• Generation of iNSCs from human fibroblasts using Sendai virus vectors.
• Immunostaining and quantitative real-time PCR (RT-qPCR) for marker expression analysis.
• Patch-clamp electrophysiology and single-cell RNA sequencing (scRNA-seq) for functional and transcriptomic profiling.

Main Results:

• No significant differences in iNSC marker expression between iNSC colonies and iNSC-derived neurons.
• Distinct action potential firing patterns observed in iNSC-derived neurons within the same batch.
• scRNA-seq revealed distinct cell types and differential gene expression (e.g., NEUROG1, PEG3, STMN2) during reprogramming and differentiation.

Conclusions:

• Functional heterogeneity exists within iNSCs and their neuronal derivatives.
• Predictive functional assessments and surrogate markers are essential for iNSC quality control.
• Ensuring iNSC quality is critical before cell banking for regenerative medicine applications.