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Fig. 6. Sequential control of lumen expansion and lumen clearance in the
Drosophila tracheal system. At stage 14 of embryonic development,
chitin (red) coordinates the radial expansion of the lumen by forming, upon
secretion, a transient fibrillar chitin-based matrix (red lines). These chitin
cables are also required for the normal organization of the apical
βH spectrin cytoskeleton (blue). At stage 16 of embryonic
development, septate junction proteins are required for the apical secretion
of Verm, which, together with Serp, is required for modifying the chitin
matrix to prevent the tracheal tubes from becoming too long
(Wang et al., 2006). At stage
17 of embryonic development, Wurst is essential for remodeling the chitin
matrix and for clearing the tracheal airway.
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