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首页> 外文期刊>Development Genes and Evolution >Possible implication of Hox genes Abdominal-B and abdominal-A in the specification of genital and abdominal segments in cirripedes
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Possible implication of Hox genes Abdominal-B and abdominal-A in the specification of genital and abdominal segments in cirripedes

机译：Hox基因Abdominal-B和abdominal-A在生殖器和腹部节段规范中的可能含义

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摘要

The crustaceans cirripedes (barnacles) are characterised by the lack of fully developed abdominal segments at any stage of their life cycle. However, in nauplius larvae of the cirripede Sacculina carcini, we detected five small engrailed stripes ina postero-dorsal region behind the sixth thoracic segment, that we interpreted as a vestigial abdomen. Here, we present additional morphological and genetic data on Sacculina to further characterise this structure. Scanning electron microscopy analysis confirms the existence of a segmented region in this part of the naupliar body. However, at the late naupliar stage, this structure stops its development and degenerates. This region expresses the Hox gene Abdominal-B, which may indicate that it actuallycorresponds to the posterior-most part of the Sacculina trunk. In addition, Abdominal-B expression differentiates two types of larvae that probably correspond to male and female larvae, respectively. In contrast, no abdominal-A expression can be detectedin the vestigial abdomen. We discuss the possible implication of the loss or divergence of the Abdominal-A protein in the impaired development of abdominal segments in cirripedes.
机译：甲壳类鞭毛虫（藤壶）的特征是在其生命周期的任何阶段都没有充分发育的腹部。然而，在卷心菜Sacculina carcini的无节幼体中，我们在第六个胸节后面的后背区域中发现了五个小褶皱条纹，我们将其解释为残余腹部。在这里，我们提出了关于葡萄球菌的其他形态和遗传数据，以进一步表征这种结构。扫描电子显微镜分析证实了在无节幼体的这一部分中存在分段区域。然而，在无节幼体后期，这种结构停止了其发展并退化。该区域表达Hox基因Abdominal-B，这可能表明它实际上对应于Sacculina树干的最后部。另外，Abdominal-B表达区分两种类型的幼虫，它们分别对应于雄性和雌性幼虫。相反，在残余腹部中未检测到腹部A表达。我们讨论了腹膜发育不良的腹部节段中A-蛋白损失或发散的可能含义。

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