Mitochondrial genome evidence suggests Cooperia sp. from China may represent a distinct species from Cooperia oncophora from Australia
文献类型: 外文期刊
作者: Ma, Jun;Liu, Guo-Hua;Zhu, Xing-Quan;Zhu, Xing-Quan;Sun, Miao-Miao;Han, Liang;Zhou, Cheng-Yan
作者机构:
关键词: Cooperia Sp. From China; Mitochondrial Genome; Mitochondrial Dna; Phylogenetic Analyses
期刊名称: Parasitol. Int.
ISSN: 1383-5769
年卷期: 2020 年 75 卷
页码:
收录情况: JCR(2021版)
摘要: Cooperia spp. are parasitic nematodes parasitizing in small intestine of ruminants with a worldwide distribution. Infection of ruminants with Cooperia species can cause severe enteritis, causing significant socio-economic losses to the livestock industry. However, it is yet to know whether there is genetic diversity in mitochondrial (mt) DNA sequences of Cooperia nematodes from different geographic regions. The objective of the present study was to examine sequence difference in mt genomes between Cooperia sp. from China and other Cooperia species. We determined the sequences of the internal transcribed spacer (ITS-1 and ITS-2) of nuclear ribosomal DNA (rDNA) of 11 Cooperia specimens collected from the small intestine of a Tianzhu White yak in Gansu Province, northwestern China, which had 99% similarity with that of C. oncophora from Brazil (GenBank accession Number: AJ544290) in ITS-1, and 99% similarity with those from Denmark (AB245040), Scotland and Australia (AJ000032) in ITS-2, indicating that specimens used in the present study should at least represent parasites in Cooperia. We then determined the complete mt genome sequences of one representative specimen of Cooperia sp. from China (CspC), compared the mt DNA sequences with that of C. oncophora from Australia (COA, GQ888713), and conducted phylogenetic analysis with selected nematodes using both maximum likelihood (ML) and Bayesian inference (BI) methods based on both concatenated 12 PCGs, rrnL and rrnS sequences and partial cox2 sequences. The complete mt genome sequence of CspC (KY769271) is 13, 583 bp in length, which is 91 bp shorter than that from COA. The sequence difference over the entire mt genome between CspC and COA was 12.2% in nucleotide and 6.3% in inferred amino acids, with nad4L and nad1 being the most variable and the most conserved PCGs, respectively. Phylogenetic analysis indicated that CspC and COA were closely-related but distinct taxa. The determination of mt genome sequences for Cooperia sp. from China also provides novel resources for further studies of taxonomy, systematics and population genetics of Cooperia from different geographical locations.
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