‘First record of Hsiungia pekingensis (Nematoda: Strongylidae) in North America: Morphological and molecular identification of a rare equine strongyle.

This research paper provides the first record of the equine strongyle nematode species, Hsiungia pekingensis, in North America. The parasite was discovered in a domestic horse in Alberta, Canada, and its identification was confirmed through detailed morphological examination and genetic sequencing.

Identification of Hsiungia Pekingensis

• The study records the first known existence of the nematode, Hsiungia pekingensis, in North America. The species was collected from the feces of a domestic horse in Alberta, Canada, who had been treated with Ivermectin, a common medication for parasitic infections in animals.
• The identification process involved a thorough morphological examination, where the physical attributes of the specimen were studied in detail. This process was complemented by genetic sequencing to determine the characteristics of specific genes.

Sequencing and Phylogenetic Analysis

• The researchers sequenced parts of the nuclear genome of this nematode species, focussing on the internal transcribed spacer 1 (ITS1), the 5.8S rRNA gene, and the internal transcribed spacer 2 (ITS2) regions. These are common areas for genetic studies as they can identify the species and provide information about its evolutionary relationships.
• The phylogenetic analysis, which studies the relationship between species, suggested a close evolutionary relationship between Hsiungia pekingensis and species from two other genera.

Value of Nemabiome Datasets

• The researchers also analyzed a pre-treatment sample using ITS2 sequencing and found evidence of Hsiungia pekingensis. This supports the reliability of this method for pinpointing the presence of specific parasite species.
• Further analysis of publicly available equine nemabiome datasets led to the detection of Hsiungia pekingensis in wild horses in Alberta. However, this species was not found in datasets from other regions, highlighting the geographical scope of its distribution.
• This research underlines the usefulness of nemabiome datasets for studying the global distribution of parasite species. These datasets contain genetic information about various nematode species and can provide considerable insights into parasite populations and their spread.

Conclusion

• Through this research, scientists have expanded their understanding of the global distribution and phylogenetic placement of Hsiungia pekingensis. This knowledge can aid in further studies on parasitic diseases in equines and potentially inform preventive measures and treatment strategies.