Comparative analysis of gene expression patterns in the arthropod labrum and the onychophoran frontal appendages, and its implications for the arthropod head problem.
Comparative analysis of gene expression patterns in the arthropod labrum and the onychophoran frontal appendages, and its implications for the arthropod head problem.
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DOI：
10.1186/s13227-016-0064-4
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发表时间：
2017
期刊：
影响因子：
4.1
通讯作者：
Janssen R
中科院分区：
文献类型：
--
作者：
Janssen R
节肢动物头部问题困扰了科学家一个多世纪。节肢动物头部的节段组成、其附肢的同源性，特别是头部最前部区域的性质仍然（至少部分地）不清楚。当前争论中心的头部形态特征之一是盂唇（上唇），这是一种覆盖节肢动物嘴巴的肉质附肢结构。一种假设是盂唇代表一对融合的原大脑肢体，可能与现存有甲动物的额附肢（主触角）和所谓的茎节肢动物的大附肢同源。最近，这一假设通过遗传数据获得了额外的支持，表明前部特异性基因 Six3 只在节肢动物盂唇和甲虫额附器中表达，为同源性提供了额外的证据。在这里，我提供了一些数据来阐明这一发现。我的研究结果表明，通过单个遗传因子的表达来实现形态结构的同源化可能会产生误导。本文的在线版本 (doi:10.1186/s13227-016-0064-4) 包含补充材料，可供授权用户使用。
The arthropod head problem has troubled scientists for more than a century. The segmental composition of the arthropod head, homology of its appendages, and especially the nature of the most anterior region of the head are still, at least partially, unclear. One morphological feature of the head that is in the center of current debate is the labrum (upper lip), a fleshy appendicular structure that covers the arthropod mouth. One hypothesis is that the labrum represents a fused pair of protocerebral limbs that likely are homologous with the frontal appendages (primary antennae) of extant onychophorans and the so-called great appendages of stem arthropods. Recently, this hypothesis obtained additional support through genetic data, showing that six3, an anterior-specific gene, is exclusively expressed in the arthropod labrum and the onychophoran frontal appendages, providing an additional line of evidence for homology. Here I present data that put this finding into perspective. The outcome of my study shows that the homologization of a morphological structure by the expression of a single genetic factor is potentially misleading. The online version of this article (doi:10.1186/s13227-016-0064-4) contains supplementary material, which is available to authorized users.
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