The complete mitogenome of the hydrothermal vent crab Gandalfus yunohana (Crustacea: Decapoda: Brachyura): a link between the Bythograeoidea and Xanthoidea
The complete mitogenome of the hydrothermal vent crab Gandalfus yunohana (Crustacea: Decapoda: Brachyura): a link between the Bythograeoidea and Xanthoidea
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热液喷口蟹 Gandalfus yunohana（甲壳类：十足目：Brachyura）的完整线粒体基因组：Bythograeoidea 和 Xanthoidea 之间的联系
DOI：
10.1111/j.1463-6409.2010.00442.x
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发表时间：
2010-11-01
影响因子：
2.5
通讯作者：
Yang, Wei-Jun
中科院分区：
文献类型：
--
作者：
Yang, Jin-Shu;Nagasawa, Hiromichi;Yang, Wei-Jun
后生动物线粒体基因组（有丝分裂基因组）通常用于各级系统发育分析和进化建模。虽然线粒体片段有助于研究热液喷口物种的发生和扩散，但很少有完整的有丝分裂基因组被确定用于全面分析。本文测定了甘道夫蟹（Gandalfus yunnohana）的全核苷酸序列。长15 567 bp， AT含量为69.9%。由于其位置（在rrnS和trnI之间）和AT丰富度（72.8%），确定了一个假定的控制区625 bp，与澳大利亚巨蟹Pseudocarcinus gigas具有高度相似性。线粒体基因顺序与典型的短爪龙模式相同。密码子的使用、核苷酸的组成和偏向性在短尾目中保存得很好。蛋白质编码基因的系统发育分析表明，它与gigas的亲缘关系最密切。这些结果都支持了口蟹科与口蟹科进化距离较近，这可能暗示了唯一的口蟹超科的起源。与其他十足动物，特别是与它的近亲短爪动物相比，龙眼有丝分裂基因组表现出高度保守的特征。有人认为是最近的起源，而不是遗迹动物群。本研究将为热液喷口生态系统的基因组学和进化研究提供大量数据。
Metazoan mitochondrial genomes (mitogenomes) are often used for all-level phylogenetic analyses and evolution modelling. Although mitochondrial fragments facilitate studying the occurrence and dispersal of hydrothermal-vent species, few complete mitogenomes have been determined for comprehensive analyses. We determined the complete nucleotide sequence of the bythograeid crab Gandalfus yunohana. The G. yunohana mitogenome is 15 567 bp in length and with an AT content of 69.9%. A putative control region of 625 bp was identified due to its position (between rrnS and trnI) and AT richness (72.8%), which exhibits high similarity with that of the Australian giant crab Pseudocarcinus gigas. The mitochondrial gene order is identical to the typical brachyuran mode. Codon usage, nucleotide composition and bias are well conserved as the Brachyura. Phylogenetic analyses from protein-coding genes indicated its closest relationship with P. gigas. All the results support the close evolution distance between the Bythograeoidea and Xanthoidea, which might imply the possible origin that the only superfamily of vent crabs underwent. The G. yunohana mitogenome exhibits highly conserved characteristics with those of other decapods, especially its close relative brachyurans. A recent origin rather than the relic fauna was suggested. The present study will supply considerable data of use for both genomics and evolutionary research on hydrothermal vent ecosystems.