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. 2017 Jun 14;7:3524. doi: 10.1038/s41598-017-01675-7

Figure 2.

Figure 2

Post-embryonic nmy-2 knockdown results in progressive seam cell loss following asymmetric divisions. (a) Combining the ts allele with RNAi was necessary to achieve a decrease of terminal seam nuclei numbers. Synchronised L1 larvae (hatched from animals grown at 15 °C) with or without the nmy-2(ne3409) or nmy-2(ne1490) ts mutations (strains AW335, AW785 and AW786, respectively) were fed control or nmy-2 RNAi at 25 °C. Seam nuclei were counted in young adults using the integrated seam cell marker wIs51[scmp::gfp]. The y-axis starts at 10 because the L1 larvae are born with 10 seam cells and gain additional seam cells through post-embryonic development. “WT” = wild-type. n > 50 for each sample. Error bars represent the standard error of the mean (SEM). Unpaired, two-tailed t-test was used to determine significance (****p < 0.0001). At least three independent replicates of the experiment were performed. Hashed pattern here and henceforth represents nmy-2 RNAi treatment. (b,c) Wild-type and nmy-2 knockdown adult hermaphrodites with the wIs51 seam cell marker. The wild-type animal showed 16 seam nuclei on one side, and the nmy-2 knockdown animal had 9. (d,e) Wild-type and nmy-2 knockdown adult hermaphrodites with the integrated membrane and DNA markers heIs63[wrt-2p::gfp::PH;wrt-2p::gfp::H2B]. The wild-type animal showed a smooth and continuous seam syncytium, and the nmy-2 knockdown animal showed two gaps in the seam syncytium (dashed lines). (f) The percentage of worms with at least one gap in the seam was quantified for the control and nmy-2 knockdown conditions following each seam cell division from L2 onwards (strains SV1009 and AW788). L2.1 = L2 first (symmetric) division. L2.2 = L2 second (asymmetric) division. n > 50 per strain per stage. Two independent replicates of the experiment were performed.