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. 2020 Apr 30;9:e55771. doi: 10.7554/eLife.55771

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© 2020, Ye et al

This article is distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use and redistribution provided that the original author and source are credited.

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Figure 5. — (A–B) Larvae were stained with sox2 antibody and atoh1a RNA probe at 6 hr post neo or LY+neo treatment. The number of atoh1a⁺sox2⁺ cells was significantly increased in LY+neo group. (C–D) The atoh1a:TdTomato larvae were used to trace atoh1a⁺ HC precursors in ctrl, LY or LY+neo. Results showed that Tomato⁺ cells labeled partial ET4⁺ HCs and ET4^-sox2^- HC precursors (yellow arrows). However, many atoh1a⁺ cells start to express sox2 from 12 hr post LY+neo and their numbers were significantly increased compared with normal larvae. The arrowheads in (C) pointed the atoh1a⁺sox2⁺ cells at 48 hr post LY+neo. (E) The atoh1a:TdTomato;hs:lin28a larvae was treated with LY+neo and verteporfin and collected for immunostaining with sox2 antibody. The cell number of Tomato⁺sox2⁺ is decreased in verteporfin and overexpression of lin28a could rescue the phenotype. (F–G) The LY-treated hs:lin28a larvae were heat-shocked to overexpress lin28a. Samples were collected for staining with sox2 antibody and atoh1a RNA probe. The number of atoh1a⁺sox2⁺ cells was significantly increased in hs:lin28a group, indicating that lin28a is sufficient to express sox2 in atoh1a⁺ HC precursors. Scale bar equals 10 μm.

Figure 5—figure supplement 1. — (A–B) Larvae were stained with sox2 antibody and atoh1a RNA probe at 6 hr post neo or LY+neo treatment. The number of atoh1a⁺sox2⁺ cells was significantly increased in LY+neo group. (C–D) The atoh1a:TdTomato larvae were used to trace atoh1a⁺ HC precursors in ctrl, LY or LY+neo. Results showed that Tomato⁺ cells labeled partial ET4⁺ HCs and ET4^-sox2^- HC precursors (yellow arrows). However, many atoh1a⁺ cells start to express sox2 from 12 hr post LY+neo and their numbers were significantly increased compared with normal larvae. The arrowheads in (C) pointed the atoh1a⁺sox2⁺ cells at 48 hr post LY+neo. (E) The atoh1a:TdTomato;hs:lin28a larvae was treated with LY+neo and verteporfin and collected for immunostaining with sox2 antibody. The cell number of Tomato⁺sox2⁺ is decreased in verteporfin and overexpression of lin28a could rescue the phenotype. (F–G) The LY-treated hs:lin28a larvae were heat-shocked to overexpress lin28a. Samples were collected for staining with sox2 antibody and atoh1a RNA probe. The number of atoh1a⁺sox2⁺ cells was significantly increased in hs:lin28a group, indicating that lin28a is sufficient to express sox2 in atoh1a⁺ HC precursors. Scale bar equals 10 μm.