Figure 1. SAM-4 and ARL-8 Are in the Same Pathway(A) A schematic drawing of the DA9 neuron. The dorsal asynaptic region, the ventral axon, and the commissure that are observed and analyzed in this study areshown. Asterisk indicates the location where the commissure joins the dorsal nerve cord.(B-F) Representative images of GFP::RAB-3 in wild-type (WT) (B),
sam-4(
tm3828) (C),
arl-8(
tm2388) (D),
arl-8(
wy271) (E), and
arl-8(
wy271);
sam-4(
tm3828) (F).GFP::RAB-3 was expressed using the
itr-1 pB promoter. Asterisks indicate the commissure bend shown in (A). Scale bars, 50 um.(G) Image montages of the dorsal axons in WT,
sam-4(3828),
arl-8(
tm2388),
arl-8(
wy271), and
sam-4(
tm3828);
arl-8(
wy271). 10 confocal images from eachgenotype were cropped, straightened, and aligned in rows with the commissure bend (asterisk) on the right using ImageJ. Scale bar, 20 um.(H and I) Statistical analysis of mutant phenotypes. The number of puncta mis-accumulated to the commissure (H) and the length of the asynaptic region (I) areshown. Lines show median values, and each dot represents one animal. Kruskal-Wallis one-way ANOVA on ranks and Dunn's multiple comparisons test,*adjusted p value < 0.05, **adjusted p value < 0.01, and ***adjusted p value < 0.001; n = 20 animals for each genotype. See also Figure S1.