首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >A truncated bone morphogenetic protein receptor affects dorsal-ventral patterning in the early Xenopus embryo.
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A truncated bone morphogenetic protein receptor affects dorsal-ventral patterning in the early Xenopus embryo.

机译:截短的骨形态发生蛋白受体会影响非洲爪蟾早期胚胎的背腹模式。

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摘要

Bone morphogenetic proteins (BMPs), which are members of the transforming growth factor beta (TGF-beta) superfamily, have been implicated in bone formation and the regulation of early development. To better understand the roles of BMPs in Xenopus laevis embryogenesis, we have cloned a cDNA coding for a serine/threonine kinase receptor that binds BMP-2 and BMP-4. To analyze its function, we attempted to block the BMP signaling pathway in Xenopus embryos by using a dominant-negative mutant of the BMP receptor. When the mutant receptor lacking the putative serine/threonine kinase domain was expressed in ventral blastomeres of Xenopus embryos, these blastomeres were respecified to dorsal mesoderm, eventually resulting in the formation of a secondary body axis. These findings suggest that endogenous BMP-2 and BMP-4 are involved in the dorsal-ventral specification in the embryo and that ventral fate requires induction rather than resulting from an absence of dorsal specification.
机译:骨形态发生蛋白(BMP)是转化生长因子β(TGF-beta)超家族的成员,已与骨形成和早期发育的调控有关。为了更好地了解BMP在非洲爪蟾胚胎发生中的作用,我们克隆了一个编码结合BMP-2和BMP-4的丝氨酸/苏氨酸激酶受体的cDNA。为了分析其功能,我们尝试通过使用BMP受体的显性阴性突变体来阻断非洲爪蟾胚胎中的BMP信号通路。当在非洲爪蟾胚胎的腹部卵裂球中表达缺少推定的丝氨酸/苏氨酸激酶结构域的突变受体时,这些卵裂球被重新指定为背中皮,最终导致形成次要的身体轴。这些发现表明内源性BMP-2和BMP-4参与了胚胎的背腹规范,腹缘命运需要诱导,而不是由于背背规范的缺乏。

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