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Region-Specific Loss of Two-Headed Ciliary Dyneins in Ascidian Endostyle

A mucous secreting organ in ascidians, the endostyle, consists of several epithelial zones with different ciliary length, density, and beating direction. Here we found by transmission electron microscopy that long cilia in endostyle zone 1 showed 9 + 2 axonemal structures but completely lacked the outer arm dynein. In contrast, cilia in other zones bore both outer and inner dynein arms. Western blotting and immunofluorescence microscopy further revealed that zone 1 appeared to lack not only outer arm dynein but also two-headed inner arm dynein. These results suggest a mechanism for a region-specific gene suppression that causes the limited loss of two-headed axonemal dyneins in the endostyle epithelium. The loss of these dyneins in zone 1 is considered to contribute to the generation of undulating ciliary movement that is essential for a unique circuit of mucus flow in the endostyle.