Reprogramming Human Adult Fibroblasts into GABAergic Interneurons

Area of Science:

• Neuroscience
• Cell Biology
• Genetics

Background:

• Direct reprogramming generates neurons from somatic cells using transcription factors.
• Previous studies generated GABAergic interneurons from glia or fetal fibroblasts.
• Reprogramming adult human fibroblasts into neurons is challenging due to neuronal commitment blockade.

Purpose of the Study:

• To develop an optimized protocol for converting adult human skin fibroblasts into GABAergic neurons.
• To overcome the challenges of neuronal commitment in adult fibroblasts.
• To generate patient-derived neurons for cell replacement and disease modeling.

Main Methods:

• Utilized an optimized protocol involving RE1 Silencing Transcription Factor (REST) inhibition.
• Employed a combination of GABAergic fate determinants for fibroblast conversion.
• Applied direct reprogramming techniques to adult human skin fibroblasts.

Main Results:

• Achieved successful conversion of adult fibroblasts into GABAergic neurons within 25 days.
• Observed upregulation of neuronal gene and protein expression levels post-conversion.
• Identified specific gene combinations crucial for GABAergic interneuronal fate determination.
• Detected functional maturation in the induced neurons despite reprogramming challenges.

Conclusions:

• Direct reprogramming of adult human fibroblasts into functional GABAergic neurons is feasible.
• REST inhibition combined with specific factors enhances neuronal conversion efficiency.
• Generated GABAergic neurons hold potential for studying and treating neurological disorders including Alzheimer's, Parkinson's, epilepsy, schizophrenia, and autism spectrum disorders.