Abstract
Progressive aging is a physiological process that represents a central risk factor for the development of several human age-associated chronic diseases, including neurodegenerative diseases. A major focus in biomedical research is the pursuit for appropriate model systems to better model the biology of human aging and the interface between aging and disease mechanisms. Direct conversion of human fibroblasts into induced neurons (iNs) has emerged as a novel technology for the in vitro modeling of age-dependent neurological diseases. Similar to other cellular reprogramming techniques, e.g., iPSC-based cellular reprograming, direct conversion relies on the ectopic overexpression of transcription factors, typically including well-known pioneer factors. However, in contrast to alternative technologies to generate neurons, the entire process of direct conversion bypasses any proliferative or stem cell-like stage, which in fact renders it the unique aptitude of preserving age-associated hallmarks from the initial fibroblast source. In this chapter, we introduce direct conversion as a practical and easy-to-approach disease model for aging and neurodegenerative disease research. A focus here is to provide a stepwise protocol for the efficient and highly reproducible generation of iNs from adult dermal fibroblasts from human donors.
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