Phylogenetic position of a whale-fall lancelet (Cephalochordata) inferred from whole mitochondrial genome sequences.
Phylogenetic position of a whale-fall lancelet (Cephalochordata) inferred from whole mitochondrial genome sequences.
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从整个线粒体基因组序列推断出的鲸鱼腹部湖泊（头孢菌）的系统发育位置。
DOI：
10.1186/1471-2148-7-127
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发表时间：
2007-07-31
影响因子：
3.4
通讯作者：
Nishikawa, Teruaki
中科院分区：
文献类型：
--
作者：
Kon, Takeshi;Nohara, Masahiro;Yamanoue, Yusuke;Fujiwara, Yoshihiro;Nishida, Mutsumi;Nishikawa, Teruaki
最近在日本西南海岸外229米深的海底发现了文昌鱼Aapelon inferum（鲸脊索动物亚门），这是一个由抹香鲸Physeter macrocephalus尸体腐烂造成的厌氧和富含硫化物的环境。这个富含硫化物的A.在兰开夏是独一无二的。这个物种对这样一个非凡的栖息地的独特适应可以在系统发育框架中考虑。作为重建该物种进化过程的第一步，我们基于11个线粒体全基因组序列，包括新测定的鲸鱼-落文昌鱼A的序列，研究了该物种的系统发育位置。inferum和两种珊瑚礁同源物。我们的系统发育分析表明，现存的lancellus聚类成两个主要分支，Apeleon分支和Epigonichthys + Branchiostoma分支。A. inferum属于前者，与A. lucayanum复合体A. inferum和A.利用惩罚似然法（PL）估计lucayanum杂岩为115百万年，利用非参数速率平滑法（NPRS）估计为97百万年（白垩纪中期）。这些都远远早于大型鲸鱼的第一次出现（始新世中期，40万年）。我们还发现A. Inferum有丝分裂基因组（线粒体基因组）经历了大规模的基因重排，重排的一个特征在文昌鱼中是独特的，而与A. lucayanum复合体我们的研究支持了基于形态特征的紫菀属单系性假设。此外，还对A. inferum有丝分裂基因组扩大了我们的知识，头索动物有丝分裂基因组内的变化，增加了一个新的情况下转座和倒位的trnQ基因。我们的发散时间估计表明，A。在转变为鲸鱼瀑布专家之前，inferum仍然是中生代和新生代早期大型脊椎动物瀑布群落的成员。
The lancelet Asymmetron inferum (subphylum Cephalochordata) was recently discovered on the ocean floor off the southwest coast of Japan at a depth of 229 m, in an anaerobic and sulfide-rich environment caused by decomposing bodies of the sperm whale Physeter macrocephalus. This deep sulfide-rich habitat of A. inferum is unique among the lancelets. The distinguishing adaptation of this species to such an extraordinary habitat can be considered in a phylogenetic framework. As the first step of reconstruction of the evolutionary processes in this species, we investigated its phylogenetic position based on 11 whole mitochondrial genome sequences including the newly determined ones of the whale-fall lancelet A. inferum and two coral-reef congeners. Our phylogenetic analyses showed that extant lancelets are clustered into two major clades, the Asymmetron clade and the Epigonichthys + Branchiostoma clade. A. inferum was in the former and placed in the sister group to A. lucayanum complex. The divergence time between A. inferum and A. lucayanum complex was estimated to be 115 Mya using the penalized likelihood (PL) method or 97 Mya using the nonparametric rate smoothing (NPRS) method (the middle Cretaceous). These are far older than the first appearance of large whales (the middle Eocene, 40 Mya). We also discovered that A. inferum mitogenome (mitochondrial genome) has been subjected to large-scale gene rearrangements, one feature of rearrangements being unique among the lancelets and two features shared with A. lucayanum complex. Our study supports the monophyly of genus Asymmetron assumed on the basis of the morphological characters. Furthermore, the features of the A. inferum mitogenome expand our knowledge of variation within cephalochordate mitogenomes, adding a new case of transposition and inversion of the trnQ gene. Our divergence time estimation suggests that A. inferum remained a member of the Mesozoic and the early Cenozoic large vertebrate-fall communities before shifting to become a whale-fall specialist.
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影响因子：
0.9
作者：
Fujikura, Katsunori;Fujiwara, Yoshihiro;Kawato, Masaru
通讯作者：
Kawato, Masaru
DOI：
10.1111/j.1439-0485.2007.00150.x
发表时间：
2007-03-01
影响因子：
1.1
作者：
Fujiwara, Yoshihiro;Kawato, Masaru;Okutani, Takashi
通讯作者：
Okutani, Takashi
DOI：
10.1098/rspb.2005.3275
发表时间：
2005-12-22
影响因子：
4.7
作者：
Glover, AG;Källström, B;Dahlgren, TG
通讯作者：
Dahlgren, TG
DOI：
10.1098/rspb.2006.3620
发表时间：
2006-10-22
影响因子：
4.7
作者：
Kiel, Steffen;Goedert, James L.
通讯作者：
Goedert, James L.
影响因子：
2.4
作者：
Kon, T.;Nohara, M.;Nishikawa, T.
通讯作者：
Nishikawa, T.