Abstract
The complete mitochondrial (mt) genome of Ostertagia trifurcata, a parasitic nematode of small ruminants, has been sequenced and its phylogenetic relationship with selected members from the superfamily Trichostrongyloidea was investigated on the basis of deduced datasets of mt amino acid sequences. The entire mt genome of Ostertagia trifurcata is circular and 14,151 bp in length. It consists of a total of 36 genes comprising 12 genes coding for proteins (PCGs), 2 genes for ribosomal RNA (rRNA), 22 transfer RNA (tRNA) genes and 2 non-coding regions, since all genes are transcribed in the same direction. The phylogenetic analysis based on the concatenated datasets of predicted amino acid sequences of the 12 protein coding genes supported monophylies of the Haemonchidae, Dictyocaulidae and Molineidae families, but rejected monophylies of the Trichostrongylidae family. The complete characterization and provision of the mtDNA sequence of Ostertagia trifurcata provides novel genetic markers for molecular epidemiological investigations, systematics, diagnostics and population genetics of Ostertagia trifurcata and its correspondents.
Highlights
Gastrointestinal parasites cause major economic losses to the livestock industry all over the world [1]
The mt genomes of Trichostrongyloidea published to date possess variations in size that range from 13,296 bp of Dictyocallus eckerti [34] to 15,221 bp of Mecistocircus digitatus [19]
The complete mt genome of O. trifurcata was determined in the present study
Summary
Gastrointestinal parasites cause major economic losses to the livestock industry all over the world [1]. Among these parasites, Ostertagia spp., which is a reddish brown worm present in the abomasum of ruminants, is a major cause of parasitic gastritis (ostertagiosis) worldwide, in temperate climates. Ostertagia spp. is considered to be among the most common gastrointestinal nematodes of ruminants [2]. Postmortem examination of small ruminants revealed a high infection rate in goats in China [2]. More than 15 Ostertagia species have been reported in small ruminants [3–5]. Ostertagia trifurcata (O. trifurcata) is distributed widely and has a lifecycle similar to Haemonchus contortus, another important parasitic nematode of small ruminants. Animals infected with Ostertagia spp. show the presence of eggs in fecal samples 15–17 days after infection [6]
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