Figure 3
PAR-aPKC complex disruption causes a ventral mismigration in which FBMNs escape the hindbrain ventrally. (A-H) Three-dimensional reconstructions of confocal Z-stacks of the Isl1:GFP positive facial motor neurons at 48 hpf in wild-type (WT) (A, E), aPKCλm 567homozygous mutant (B, F), aPKCλ+ζ double morpholino knockdown (C, G), and pard6gbfh 266homozygous mutant embryos (D, H) shown in dorsal (A-D) and lateral (E-H) views. In aPKCλm 567, aPKCλ+ζ double morpholino knockdown, and pard6gbfh 266embryos (F, G, H), a subset of FBMNs mismigrates ventrally (arrows) forming ectopic ventral clusters. (I, J) Maximum intensity projections of confocal Z-stacks of 24-hpf WT (I) and aPKCλ+ζ MO (J) embryos stained with an antibody that recognizes both aPKCs reveals that double morpholino knockdown reduces aPKC to undetectable levels. (K, L) Vibratome coronal sections through 48-hpf WT (K) and aPKCλ+ζ MO (L) embryos at 48 hpf counterstained with BODIPY TR methylester dye that stains all membranes reveals that morphant FBMNs are found outside the hindbrain (arrow). In addition, the cross-sectional area of the aPKCλ+ζ MO hindbrain is reduced and the ventricle has not inflated.