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Generation and characterization of miR499 knockout. (A) Schematic illustration of miR499 mutation induction by the CRISPR/Cas9 system with two sgRNAs, and sequencing results of WT and miR499 mutant (F2) with 4—bp deletion (named miR499−/−). Underlined and italicized text indicates the sgRNA target sequence. Green font denotes the pre-miRNA-499 sequence. (B) Semi-quantitative RT-PCR analysis of dre—miR499—5P and dre—miR499—3P expression in WT and miR499−/− fish, with U6 as a loading control. *** p < 0.001. ns: no significance; (C) Representative images of WT and miR499−/− fish at 30 days post-fertilization. Scale bars = 50 mm.
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