Fig. 5 Generation of a rod-specific, epitope-tagged, rtTA-expressing transgenic line for doxycycline-inducible gene expression.
(A) Diagram of the construct used to generate a stable transgenic zebrafish line that expresses a FLAG-tagged rtTA protein specifically in rod photoreceptors. The Xenopus rhodopsin promoter (Xla.rho) drives the flag epitope-tagged reverse tetracycline-controlled transcriptional activator (rtTAflag) gene. (B, C) Confocal z-projection of a retinal section from a 6 dpf Tg(Xla.rho:rtTAflag) larva labeled with anti-FLAG and anti-Rhodopsin antibodies. (B) Anti-FLAG immunofluorescence (red) is visible in the photoreceptor layer. (C) The anti-FLAG immunofluorescence (red) colocalizes with the anti-Rhodopsin immunofluorescence (blue) in the rod photoreceptors. dA, polyadenylation sequence; Tol2, pTol integration site. Scale bar, 50 µm.