title: Characterization of the complete mitochondrial genomes of five Eimeria species from domestic chickens.
abstract: Chicken coccidiosis caused by members of the genus Eimeria causes significant economic losses worldwide. In the present study we sequenced the complete mitochondrial DNA (mtDNA) sequences of six Eimeria species and analyzed features of their gene contents and genome organizations. The complete mt genomes of E. acervulina, E. brunetti, E. maxima, E. necatrix, E. tenella and E. praecox were 6179bp, 6148bp, 6169bp, 6214bp, 6213bp and 6174bp in size, respectively. All of the mt genomes consist of 3 genes for proteins (cox1, cox3, and cytb), 12 gene fragments for the large subunit (LSU) rRNA, and 7 gene fragments for the small subunit (SSU) rRNA, but no transfer RNA genes. The organization of the mt genomes is similar to that of Plasmodium, but distinct from Babesia and Theileria. The putative direction of translation for 3 genes (cox1, cox3, and cytb) was the same in all six Eimeria species. The contents of A+T of the mt genomes were 65.35% for E. acervulina, 65.43% for E. brunetti, 64.53% for E. maxima, 65.04% for E. necatrix, 64.98% for E. tenella and 65.59% for E. praecox. The AT bias has a significant effect on both the codon usage pattern and amino acid composition of proteins. Phylogenetic analyses using concatenated nucleotide sequences of the 2 protein-coding genes (cytb and cox1), with three different computational algorithms (Bayesian analysis, maximum parsimony and maximum likelihood), all revealed distinct groups with high statistical support, indicating that the six Eimeria spp. represent six distinct but closely-related species. These data provide novel mtDNA markers for studying the molecular epidemiology and population genetics of the six Eimeria spp., and should have implications for the molecular diagnosis, prevention and control of coccidiosis in domestic chickens.
authors.affiliation: Department of Parasitology, State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, CAAS, Lanzhou, Gansu, PR China.
authors.forename: Rui-Qing
authors.initials: RQ
authors.lastname: Lin
authors.forename: Li-Ling
authors.initials: LL
authors.lastname: Qiu
authors.forename: Guo-Hua
authors.initials: GH
authors.lastname: Liu
authors.forename: Xiang-Yun
authors.initials: XY
authors.lastname: Wu
authors.forename: Ya-Biao
authors.initials: YB
authors.lastname: Weng
authors.forename: Wen-Qin
authors.initials: WQ
authors.lastname: Xie
authors.forename: Jie
authors.initials: J
authors.lastname: Hou
authors.forename: Hong
authors.initials: H
authors.lastname: Pan
authors.forename: Zi-Guo
authors.initials: ZG
authors.lastname: Yuan
authors.forename: Feng-Cai
authors.initials: FC
authors.lastname: Zou
authors.forename: Min
authors.initials: M
authors.lastname: Hu
authors.forename: Xing-Quan
authors.initials: XQ
authors.lastname: Zhu
mesh_terms: D000818:Animals; D001483:Base Sequence; D002645:Chickens / Q000469:parasitology*; D004539:Eimeria / Q000235:genetics*; D017125:Genes, Protozoan; D054629:Genome, Mitochondrial; D018503:Genome, Protozoan; D009154:Mutation; D010802:Phylogeny