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- W2806081567 abstract "During gastrulation, one of the most important morphogenetic events in sea urchin embryogenesis, the gut bends toward the ventral side to form an open mouth. Although the involvement of transforming growth factor-β (TGF-β) signals in the cell-fate specification of the ectoderm and endoderm along the dorsal-ventral axis has been well reported, it remains unclear what controls the morphogenetic behavior of gut bending. Here, using two sea urchin species, Hemicentrotus pulcherrimus and Temnopleurus reevesii, we show that TGF-β signals are required for gut bending toward the ventral side. To search for the common morphogenetic cue in these two species, we initially confirmed the expression patterns of the dorsal-ventral regulatory TGF-β members, nodal, lefty, bmp2/4, and chordin, in T. reevesii because these factors are appropriate candidates to investigate the cue that starts gut bending, although genetic information about the body axes is entirely lacking in this species. Based on their expression patterns and a functional analysis of Nodal, the dorsal-ventral axis formation of T. reevesii is likely regulated by these TGF-β members, as in other sea urchins. When the Alk4/5/7 signal was inhibited by its specific inhibitor, SB431542, before the late gastrula stage of T. reevesii, the gut was extended straight toward the anterior tip region, although the ectodermal dorsal-ventral polarity was normal. By contrast, H. pulcherrimus gut bending was sensitive to SB431542 until the prism stage. These data clearly indicate that gut bending is commonly dependent on a TGF-β signal in sea urchins, but the timing of the response varies in different species." @default.
- W2806081567 created "2018-06-13" @default.
- W2806081567 creator A5003165688 @default.
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- W2806081567 date "2018-05-01" @default.
- W2806081567 modified "2023-09-25" @default.
- W2806081567 title "Transforming growth factor-β signal regulates gut bending in the sea urchin embryo" @default.
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- W2806081567 doi "https://doi.org/10.1111/dgd.12434" @default.
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