Identification of vertebra-like elements and their possible differentiation from sclerotomes in the hagfish.
Identification of vertebra-like elements and their possible differentiation from sclerotomes in the hagfish.
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DOI：
10.1038/ncomms1355
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发表时间：
2011-06-28
影响因子：
16.6
通讯作者：
Kuratani, Shigeru
中科院分区：
文献类型：
--
作者：
Ota, Kinya G.;Fujimoto, Satoko;Oisi, Yasuhiro;Kuratani, Shigeru
盲鳗是一种现存的无颌鱼类，已知缺乏真正的椎骨，因此经常被排除在脊椎动物之外。然而，它还没有最终表明八目鳗是否缺乏所有的脊椎样结构，以及它们的体节是否遵循与七鳃鳗和有颌类不同的发育过程和模式。在这里，我们报告的存在下，脊椎样软骨的近岸盲鳗，Eptatretus burgeri。这些元素出现的小结节占据的解剖位置可比的gnathostome椎骨。八目鳗胚胎的检查表明，体节的腹内侧部分转化为间充质细胞，表达同源的Pax 1/9和扭曲，惊人的相似的模式，硬骨鱼的发展。我们的结论是，脊椎样元素的盲鳗是同源的gnathostome椎骨，这意味着这种动物经历了二次减少的椎骨在大部分的躯干。盲鳗是一种现存的无颌鱼类，缺乏真正的脊椎，但目前还不清楚盲鳗是否缺乏所有的脊椎类结构。在这里，作者报告的脊椎软骨的存在，在近岸八目鳗，这表明八目鳗进行了二次脊椎复位。
The hagfish, a group of extant jawless fish, are known to lack true vertebrae and, for this reason, have often been excluded from the group Vertebrata. However, it has yet to be conclusively shown whether hagfish lack all vertebra-like structures, and whether their somites follow developmental processes and patterning distinct from those in lampreys and gnathostomes. Here we report the presence of vertebra-like cartilages in the in-shore hagfish, Eptatretus burgeri. These elements arise as small nodules occupying anatomical positions comparable to those of gnathostome vertebrae. Examination of hagfish embryos suggests that the ventromedial portion of a somite transforms into mesenchymal cells that express cognates of Pax1/9 and Twist, strikingly similar to the pattern of sclerotome development in gnathostomes. We conclude that the vertebra-like elements in the hagfish are homologous to gnathostome vertebrae, implying that this animal underwent secondary reduction of vertebrae in most of the trunk. Hagfish, a group of extant jawless fish, lack true vertebrae, but it is not clear if hagfish lack all vertebrata-like structures. Here the authors report the presence of vertebra-like cartilages in the in-shore hagfish, suggesting that the hagfish underwent secondary reduction of vertebra.
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影响因子：
10.7
作者：
Mallat, J;Sullivan, J
通讯作者：
Sullivan, J
DOI：
10.1002/jez.b.21322
发表时间：
2010-03-15
影响因子：
2.2
作者：
Ota, Kinya G.;Kuratani, Shigeru
通讯作者：
Kuratani, Shigeru
影响因子：
11.4
作者：
GOULDING, MD;CHALEPAKIS, G;GRUSS, P
通讯作者：
GRUSS, P
影响因子：
1.5
作者：
MILES, RS
通讯作者：
MILES, RS
DOI：
10.1073/pnas.1010350107
发表时间：
2010-11-09
影响因子：
11.1
作者：
Heimberg, Alysha M.;Cowper-Sallari, Richard;Peterson, Kevin J.
通讯作者：
Peterson, Kevin J.