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首页> 外文期刊>Zoological Science >Evolutionary Changes in the Developmental Origin of Hatching Gland Cells in Basal Ray-Finned Fishes
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Evolutionary Changes in the Developmental Origin of Hatching Gland Cells in Basal Ray-Finned Fishes

机译：底鳍鳍鱼孵化腺细胞发育起源的进化变化

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摘要

Hatching gland cells (HGCs) originate from different germ layers between frogs and teleosts, although the hatching enzyme genes are orthologous. Teleostei HGCs differentiate in the meso-endodermal cells at the anterior end of the involved hypoblast layer (known as the polster) in late gastrula embryos. Conversely, frog HGCs differentiate in the epidermal cells at the neural plate border in early neurula embryos. To infer the transition in the developmental origin of HGCs, we studied two basal ray-finned fishes, bichir (Polypterus) and sturgeon. We observed expression patterns of their hatching enzyme (HE) and that of three transcription factors that are critical for HGC differentiation: KLF17 is common to both teleosts and frogs; whereas FoxA3 and Pax3 are specific to teleosts and frogs, respectively. We then inferred the transition in the developmental origin of HGCs. In sturgeon, the KLF17, FoxA3, and HE genes were expressed during the tailbud stage in the cell mass at the anterior region of the body axis, a region corresponding to the polster in teleost embryos. In contrast, the bichir was suggested to possess both teleost- and amphibian-type HGCs, i.e. the KLF17 and FoxA3 genes were expressed in the anterior cell mass corresponding to the polster, and the KLF17, Pax3 and HE genes were expressed in dorsal epidermal layer of the head. The change in developmental origin is thought to have occurred during the evolution of basal ray-finned fish, because bichir has two HGCs, while sturgeon only has the teleost-type.
机译：孵化腺细胞（HGC）来自青蛙和硬骨鱼之间不同的细菌层，尽管孵化酶基因是直系同源的。硬骨鱼HGC在晚期胃胚胚中所涉及的次胚层（称为polster）的前端的中胚层内胚层细胞中分化。相反，青蛙HGCs在早期神经胚胚胎的神经板边界的表皮细胞中分化。为了推断HGC的发育起源的过渡过程，我们研究了两种基底射线鳍鱼，比希尔（Polypterus）和st鱼。我们观察到了它们的孵化酶（HE）的表达模式以及对HGC分化至关重要的三个转录因子的表达模式：硬骨鱼和青蛙都常见KLF17;而FoxA3和Pax3分别特定于硬骨鱼和青蛙。然后，我们推断了HGC的发育起源的转变。在st鱼中，KLF17，FoxA3和HE基因在尾芽阶段在体轴前部的细胞团中表达，该区域对应于硬骨鱼胚中的polster。相比之下，比西尔被建议同时拥有硬骨和两栖类HGC，即KLF17和FoxA3基因在对应于polster的前细胞中表达，而KLF17，Pax3和HE基因在背面表皮层表达的头。人们认为发育起源的变化是在基鳍鱼的进化过程中发生的，因为比希尔有两个HGC，而st鱼只有硬骨鱼类型。

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