Tmem161b expression is specific to excitable cells and localizes to plasma membranes. A tmem161b BAC transgenic line, Tg(tmem161bBAC:tmem161b-citrine), generated by fusing a Citrine cassette to the C terminus of the Tmem161b protein, permits analysis of the tmem161b expression pattern as well as protein localization. (A) At 5 dpf, Tg(tmem161bBAC:tmem161b-citrine) transgenics show Tmem161b-Citrine expression in excitable cells, including cardiomyocytes (bracket), ionocytes (arrows), and neuromasts (arrowheads). (B) High-magnification view of ventricular cardiomyocytes at 5 dpf of Tg(tmem161bBAC:tmem161b-citrine) embryos crossed to the Tg(myl7:cherry-caax) line (cardiomyocyte reporter) shows Tmem161b-Citrine localization at or near the plasma membrane of cardiomyocytes. (C) Imaging of ionocytes and neuromasts of Tg(tmem161bBAC:tmem161b-citrine) at 5 dpf showing enrichment for Tmem161b-Citrine in these cell types. Ionocyte and neuromast identity are confirmed by staining with Mitotracker (magenta).
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