Fig. 1

TEAZ. (A) Schematic representation of the method applied for the introduction of ubb:tdTomato directly under the dorsal fin of adult zebrafish. The purified plasmid DNA (1??l of a 1000?ng/?l solution of ubb:tdTomato) is injected into anesthetized zebrafish using a pulled glass micropipette. Electrical pulses are directed across the injected region (settings: LV mode, 45?V, 5 pulses, 60?ms pulse length and 1?s pulse interval). Reporter expression can be visualized by fluorescent microscopy (n=2/2). (B) Electroporation of a CMV:tdTomato plasmid was performed and the animal followed for a period of 8?months (n=2/2). The fluorescent signal can be visualized as early as 1?dpe, with intensity peaking at ?1 week and maintaining for at least 8?months. (C) Multiple plasmids will co-integrate in TEAZ. casper zebrafish were electroporated with a total volume of 1.0??l (0.5??l of 1000?ng/?l ubb:GFP and 0.5??l of 1000?ng/?l ubb:tdTomato) and imaged using BF, GFP and tdTomato (n=3/3), revealing co-expression of the plasmids. (D) Promoter specificity is maintained following TEAZ. AB fish were electroporated with 1.0??l total volume (0.5??l of 1000?ng/?l ubb:GFP and 0.5??l of 1000?ng/?l mitfa:tdTomato) and displayed highly restricted expression of the mitfa reporter plasmid, but widespread expression of the ubb plasmid (n=9/9). High-resolution imaging of the tdTomato⁺ cells reveals a dendritic phenotype, consistent with the melanocytic lineage.