The Hox gene Antennapedia regulates wing development through 20-hydroxyecdysone in insect
Fang, C.; Xin, Y.; Sun, T.; Monteiro, A.; Ye, Z.; Dai, F.; Lu, C.; Tong, X.
10.1101/2021.05.26.445904 bioRxivShow abstract
A long-standing view in the field of evo-devo is that insect forewings develop without any Hox gene input. The Hox gene Antennapedia (Antp), despite being expressed in the thoracic segments of insects, has no effect on wing development. This view has been obtained from studies in two main model species, Drosophila and Tribolium. Here, we show that partial loss of function of Antp resulted in reduced and malformed adult wings in Bombyx, Drosophila, and Tribolium. Antp mediates wing growth in Bombyx by directly regulating the ecdysteriod biosynthesis enzyme gene (shade) in the wing tissue, which leads to local production of the growth hormone 20E. In turn, 20E signaling also up-regulates Antp. Additional targets of Antp are wing cuticular protein genes CPG24, CPH28, and CPG9, essential for wing development. We propose, thus, that insect wing development occurs in an Antp-dependent manner.
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