ZFIN Image: Sánchez-Iranzo et al., 2018, Fig. 4

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Fig. 4

Genetic ablation of tbx5a-derived ventricular cardiomyocytes. a tbx5a⁺ ventricular cardiomyocytes were genetically ablated in tbx5a:CreER^T2;vmhcl:loxP-tagBFP-loxP-mCherry-NTR double transgenic zebrafish. Recombination was induced by administration of 4-Hydroxytamoxifen (4-OHT). Cell ablation was induced by administration of Metronidazole (Mtz) from 4 to 7 days postfertilisation. b, c Ventral views of larval hearts at 4 dpf (maximal projection and optical section, respectively). Anterior is to the top. The proximal ventricle, including primordial layer and trabeculae, is completely mCherry⁺ and the distal ventricle is blue (tagBFP⁺); n = 7/7. d, e Sagittal section of the ventricle of an adult recombined heart. Most cells are mCherry⁺. Only the tbx5a⁻ region is tagBFP. n = 7/7. f, g, Sagittal section of a Mtz-treated fish. Most of the cardiomyocytes are tagBFP⁺; n = 6/6. h, Quantification of the percentage of myocardium that is tagBFP⁺ (SHF-derived), mean±SD; *** P < 0.0001 by two-tailed unpaired t-test. at, atrium; prim, primordial layer; SHF, second heart field; trab, trabeculae; v, ventricle. Scale bars, 25 μm

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