PT - JOURNAL ARTICLE AU - Janine K Reinert AU - Ivo Sonntag AU - Hannah Sonntag AU - Rolf Sprengel AU - Patric Pelzer AU - Sascha Lessle AU - Michaela Kaiser AU - Thomas Kuner TI - retroLEAP: rAAV-based retrograde trans-synaptic labeling, expression and perturbation AID - 10.1101/537928 DP - 2019 Jan 01 TA - bioRxiv PG - 537928 4099 - http://biorxiv.org/content/early/2019/02/01/537928.short 4100 - http://biorxiv.org/content/early/2019/02/01/537928.full AB - Identifying and manipulating synaptically connected neurons across brain regions remains a core challenge in understanding complex nervous systems. RetroLEAP is a novel approach for retrograde trans-synaptic Labelling, Expression And Perturbation. GFP-dependent recombinase (Flp-DOG) detects trans-synaptic transfer of GFP-tetanus toxin heavy chain fusion protein (GFP-TTC) and activates expression of any gene of interest in synaptically connected cells. RetroLEAP overcomes existing limitations, is non-toxic, highly flexible, efficient, sensitive and easy to implement.