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Figure 6 | EvoDevo

Figure 6

From: Components of the dorsal-ventral pathway also contribute to anterior-posterior patterning in honeybee embryos (Apis mellifera)

Figure 6

Summary of extraembryonic membrane patterning across holometabolous insects with respect to Dpp and zen expression. (A) In Cyclorrhaphan flies, such as Drosophila, the extraembryonic membranes develop as a single tissue, the amnioserosa (purple dashed), which is specified at the dorsal midline by Dpp (grey) and zen expression (purple). (B) In Dipteran Nematoceran flies, the serosa and amnion are specified separately by Dpp (grey) expression on the ventral side of either pole in the midge mite Clogmia[32] and Ca-zen expression (light purple) in an anterior-dorsal domain [60]. The serosa (yellow dashed line) developing to surround the entire germ band of the embryo [60]. (C) Tribolium zen1 expression (yellow) specifies the serosa only, zen2 is required for fusion of the serosa and amnion following dorsal closure but not their specification [8]. Tc-Dpp (grey) is expressed across the DV axis at the serosa border [13]. In Tribolium, the serosa and amnion grow over the germ band to cover the embryo as separate surrounding membranes/cell layers. (D) In Apis mellifera, the amnion (pale purple) develops from dorsal midline (zen expressing cells, dark blue) to cover the yolk. The honeybee serosa tissue (yellow dashed line) is initially specified from cells at the anterior end of the blastoderm (which are also expressing zen (shown in yellow)) that move to surround the entire embryo. Dpp expression is found at the anterior and posterior ends of the embryo and is required for anterior-dorsal zen expression and serosa patterning.

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