FIGURE 4:

Depletion of Gle1 reduces ciliary beating and alters left–right asymmetry in zebrafish. (A) The axoneme and the basal body of the cilia were mosaically labeled by Arl13b-eGFP and Cetn4-TagRFP, respectively, in uninjected, ipk1^MO1-injected, or gle1^MOs-injected embryos. Motile cilia in the Kupffer’s vesicle were imaged at six- to nine-somite stages from the dorsal side, anterior to the right. Normal ciliary beating is detected by a fan-like morphology in the control. Scale bar, 5 μm. (B) Tg(-5.1mnx1:TagRFP) embryos were injected with suboptimal doses of translation-blocking ipk1 morpholino (ipk1^MO1, 4 ng), a mix of two nonoverlapping translation-blocking gle1 morpholinos (gle1^MOs, 1.5 ng each), or a combination of both ipk1^MO1 and gle1^MOs at the one-cell stage. The direction of the heart looping (TagRFP⁺) was assessed at 60–72 h post fertilization. Three independent injections were performed for each condition. Values are mean ± SEM; n is the number of embryos analyzed in each condition.