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学科主题: Parasitology
题名: Complete mitochondrial genome sequences of two parasitic/commensal nemerteans, Gononemertes parasita and Nemertopsis tetraclitophila (Nemertea: Hoplonemertea)
作者: Sun, WY ; Xu, DL ; Chen, HX ; Shi, W ; Sundberg, P ; Strand, M ; Sun, SC
通讯作者: sunsc@ouc.edu.cn
关键词: Nemertea ; Gononemertes parasita ; Nemertopsis tetraclitophila ; Parasitic/Commensal ; Mitochondrial genome ; Phylogeny
刊名: PARASITES & VECTORS
发表日期: 2014
卷: 7, 页:-273
收录类别: sci
部门归属: [Sun, Wen-Yan ; Xu, Dong-Li ; Chen, Hai-Xia ; Sun, Shi-Chun] Ocean Univ China, Inst Evolut & Marine Biodivers, Qingdao 266003, Peoples R China ; [Chen, Hai-Xia ; Sundberg, Per] Univ Gothenburg, Dept Biol & Environm Sci, SE-40530 Gothenburg, Sweden ; [Shi, Wei] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marine Bioresource Sustainable Utilizat L, Guangzhou 510301, Guangdong, Peoples R China ; [Strand, Malin] Swedish Univ Agr Sci, Swedish Species Informat Ctr, SE-75007 Uppsala, Sweden
项目归属: LMB
资助者: National Natural Science Foundation of China [31172046, 30970333]
摘要: Background: Most nemerteans (phylum Nemertea) are free-living, but about 50 species are known to be firmly associated with other marine invertebrates. For example, Gononemertes parasita is associated with ascidians, and Nemertopsis tetraclitophila with barnacles. There are 12 complete or near-complete mitochondrial genome (mitogenome) sequences of nemerteans available in GenBank, but no mitogenomes of none free-living nemerteans have been determined so far. In the present paper complete mitogenomes of the above two parasitic/commensal nemerteans are reported. Methods: The complete mitochondrial genomes (mitogenome) of G. parasita and N. tetraclitophila were amplified by conventional and long PCR. Phylogenetic analyses of maximum likelihood (ML) and Bayesian inference (BI) were performed with both concatenated nucleotide and amino acid sequences. Results: Complete mitogenomes of G. parasita and N. tetraclitophila are 14742 bp and 14597 bp in size, respectively, which are within the range of published Hoplonemertea mitogenomes. Their gene orders are identical to that of published Hoplonemertea mitogenomes, but different from those of Palaeo- and Heteronemertea species. All the coding genes, as well as major non-coding regions (mNCRs), are AT rich, which is especially pronounced at the third codon position. The AT/GC skew pattern of the coding strand is the same among nemertean mitogenomes, but is variable in the mNCRs. Some slight differences are found between mitogenomes of the present species and other hoplonemerteans: in G. parasita the mNCR is biased toward T and C (contrary to other hoplonemerteans) and the rrnS gene has a unique 58-bp insertion at the 5' end; in N. tetraclitophila the nad3 gene starts with the ATT codon (ATG in other hoplonemerteans). Phylogenetic analyses of the nucleotide and amino acid datasets show early divergent positions of G. parasita and N. tetraclitophila within the analyzed Distromatonemertea species, and provide strong support for the close relationship between Hoplonemertea and Heteronemertea. Conclusion: Gene order is highly conserved within the order Monostilifera, particularly within the Distromatonemertea, and the special lifestyle of G. parasita and N. tetraclitophila does not bring significant variations to the overall structures of their mitogenomes in comparison with free-living hoplonemerteans.
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WOS记录号: WOS:000338735100001
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10427
Appears in Collections:中科院海洋生物资源可持续利用重点实验室_期刊论文

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Sun, WY; Xu, DL; Chen, HX; Shi, W; Sundberg, P; Strand, M; Sun, SC.Complete mitochondrial genome sequences of two parasitic/commensal nemerteans, Gononemertes parasita and Nemertopsis tetraclitophila (Nemertea: Hoplonemertea),PARASITES & VECTORS,2014,7():-273
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