Genetic typing of equine arteritis virus isolates from Argentina.

This research focuses on the investigating the genetic diversity of four isolates of Equine Arteritis Virus (EAV) from Argentina, obtained from healthy, virus-shedding stallions. The results showed a link between Argentine and European strains and the study is the first of its kind involving Argentine EAV isolates.

Methodology and Data Collection

• Researchers examined four EAV isolates from Argentina, which were obtained from asymptomatic, virus-shedding stallions. These horses carried the virus without showing any symptoms.
• Nucleic acid was extracted from the virus isolates, then amplified using a technique known as Reverse Transcriptase Polymerase Chain Reaction (RT-PCR). This is a common method used to create numerous copies of a specific DNA sequence.
• The amplified DNA was then sequenced to determine the precise order of the nucleotides within the isolated DNA molecules.

Data Analysis

• The nucleotide and deduced amino acid sequences obtained from the Argentinean isolates were compared with 17 other sequences already available in the GenBank. GenBank is a public database that holds all publicly available nucleotide sequences and their protein translations.
• Through comparison and analysis, researchers used phylogenetic analysis, a method used to examine the evolutionary relationships between different species. The analysis disclosed that the Argentine isolates grouped together in a cluster close to European strains.
• The team noted considerable genetic variability among the ORF 5 from different isolates and strains of EAV, despite this, phylogenetic trees (diagrammatic representations of the evolutionary relationships) based on ORF 5 and 6 appeared similar.

Results and Conclusions

• The constructed phylogenetic trees revealed that virus sequences from America and Europe separated into distinct clusters based on the sequence analysis of either ORF 5 or 6. This indicates a geographical distinction in the genetic structures of the virus.
• Finally, this research represents the first characterization of Argentine EAV isolates, filling a gap in knowledge about the genetic diversity and makeup of EAV in Argentina and how it compares to EAV strains from other regions.