Mitochondrial genomes are valuable for making inferences regarding population genetics, phylogenetics and recently in understanding adaptive variation in OXPHOS genes. Ribbon fish, Trichiurus lepturus is distributed in the Indian Ocean and contributes to a major share of pelagic fish landings. Considering the importance, we characterized the complete mitogenome of large head hairtail T. lepturus from Indian waters by PCR amplification and sequencing. The entire mitogenome is 16,840 bp in length, with 13 protein coding genes, 2 subunit ribosomal RNA genes, and 1 control region similar to other vertebrates. Genome contains only 21 tRNAs (tRNA^Pro is absent) as against 22 tRNAs reported in other vertebrates. The putative origin of L-strand replication (O_L) was located in a cluster of five tRNA genes (WANCY region) and may not be functional due to the variation of conserved motif (5′-GCCGG-3′) and loop. These two unusual features are common for Trichiurus mitogenomes. Phylogenetic analysis supported the monophyly of Trichiuridae. This study will provide information for further studies on taxonomy, phylogeny and patterns of adaptive evolution in the mitogenome of Trichiurus species.

中文翻译：

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大头Hair鱼Trichiurus lepturus（Trichiuridae）的整个丝分裂基因组的特征：对特殊特征的见解。

线粒体基因组对于推断种群遗传学，系统发育学以及最近了解OXPHOS基因的适应性变异非常有价值。丝带鱼（Trichiurus lepturus）分布在印度洋，占上层鱼类上岸的主要份额。考虑到重要性，我们的特点大头带鱼的完整线粒体基因T.细穗草属由PCR扩增和测序印度水域。整个有丝分裂基因组的长度为16,840 bp，具有13个蛋白质编码基因，2个亚基核糖体RNA基因和1个与其他脊椎动物相似的控制区。与其他脊椎动物中报道的22种tRNA相比，基因组仅包含21种tRNA（不存在tRNA ^Pro）。L链复制的假定来源（O_L）位于五个tRNA基因（WANCY区域）的簇中，由于保守基序（5'-GCCGG-3'）和环的变异，可能无法发挥功能。对于Trichiurus有丝分裂基因组来说，这两个不寻常的特征很常见。系统发育分析支持旋毛虫科的单性。这项研究将为Trichiurus物种的有丝分裂基因组的分类学，系统发育和适应性进化模式的进一步研究提供信息。