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首页> 外文期刊>Marine genomics >Comparative mitogenomic analysis of three species of periwinkles: Littorina fabalis, L-obtusata and L-saxatilis
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Comparative mitogenomic analysis of three species of periwinkles: Littorina fabalis, L-obtusata and L-saxatilis

机译：三种Per-Winkles的比较诱导方法分析：Littorina Fabalis，L-optusata和L-Saxatilis

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摘要

The flat periwinkles, Littorina fabalis and L obtusata, offer an interesting system for local adaptation and ecological speciation studies. In order to provide genomic resources for these species, we sequenced their mitogenomes together with that of the rough periwinkle L saxatilis by means of next-generation sequencing technologies. The three mitogenomes present the typical repertoire of 13 protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes and a putative control region. Although the latter could not be fully recovered in flat periwinkles using short-reads due to a highly repetitive fragment, in L, saxatilis this problem was overcome with additional long-reads and we were able to assemble the complete mitogenome. Both gene order and nucleotide composition are similar between the three species as well as compared to other Littorinimorpha. A large variance in divergence was observed across mitochondrial regions, with six- to ten-fold difference between the highest and the lowest divergence rates. Based on nucleotide changes on the whole molecule and assuming a molecular clock, I. fabalis and L obtusata started to diverge around 0.8 Mya (0.4-1.1 Mya). The evolution of the mitochondria! protein-coding genes in the three Littorina species appears mainly influenced by purifying selection as revealed by phylogenetic tests based on d(N)/d(S) ratios that did not detect any evidence for positive selection, although some caution is required given the limited power of the dataset and the implemented approaches. (C) 2016 Elsevier B.V. All rights reserved.
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  • 来源
    《Marine genomics》 |2017年第1期|共7页
  • 作者

    Marques Joao P.; Sotelo Graciela; Larsson Tomas; Johannesson Kerstin; Panova Marina; Faria Rui;

  • 作者单位

    Univ Porto Lab Associado Ctr Invest Biodiversidade &

    Recursos Genet CIBIO InBIO Campus Agr Vairao P-4485661 Vairao Portugal;

    Univ Porto Lab Associado Ctr Invest Biodiversidade &

    Recursos Genet CIBIO InBIO Campus Agr Vairao P-4485661 Vairao Portugal;

    Univ Gothenburg Dept Marine Sci Box 460 SE-40530 Gothenburg Sweden;

    Univ Gothenburg Dept Marine Sci SE-45296 Stromstad Sweden;

    Univ Gothenburg Dept Marine Sci SE-45296 Stromstad Sweden;

    Pompeu Fabra Univ Dept Expt &

    Hlth Sci Inst Evolutionary Biol CSIC UPF IBE Doctor Aiguader 88 Barcelona 08003 Spain;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 遗传学;
  • 关键词

    annotation; assembly; Gastropoda; mtDNA divergence; selection;

    机译：注释;组装;胃肠杆菌;mtdna发散;选择;

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