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Giehrl-Schwab, J. ; Giesert, F. ; Rauser, B. ; Lao, C.L. ; Hembach, S. ; Lefort, S. ; Ibarra Del Rio, I.A. ; Koupourtidou, C. ; Luecken, M. ; Truong, D.-J.J. ; Fischer-Sternjak, J. ; Masserdotti, G. ; Prakash, N.* ; Ninkovic, J. ; Hölter, S.M. ; Vogt Weisenhorn, D.M. ; Theis, F.J. ; Götz, M. ; Wurst, W.

Parkinson's disease motor symptoms rescue by CRISPRa-reprogramming astrocytes into GABAergic neurons.

EMBO Mol. Med.:e14797 (2022)

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Direct reprogramming based on genetic factors resembles a promising strategy to replace lost cells in degenerative diseases such as Parkinson's disease. For this, we developed a knock-in mouse line carrying a dual dCas9 transactivator system (dCAM) allowing the conditional in vivo activation of endogenous genes. To enable a translational application, we additionally established an AAV-based strategy carrying intein-split-dCas9 in combination with activators (AAV-dCAS). Both approaches were successful in reprogramming striatal astrocytes into induced GABAergic neurons confirmed by single-cell transcriptome analysis of reprogrammed neurons in vivo. These GABAergic neurons functionally integrate into striatal circuits, alleviating voluntary motor behavior aspects in a 6-OHDA Parkinson's disease model. Our results suggest a novel intervention strategy beyond the restoration of dopamine levels. Thus, the AAV-dCAS approach might enable an alternative route for clinical therapies of Parkinson's disease.

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