title: Complete genomic characterization of a European type 1 porcine reproductive and respiratory syndrome virus isolate in Korea.
abstract: Porcine reproductive and respiratory syndrome virus (PRRSV) isolates belonging to the European genotype 1 have recently emerged in South Korea, suggesting potential problems for disease control. In the present study, we attempted to determine the complete nucleotide sequence of the first Korean type 1 PRRSV isolate, designated KNU-07. The full-length genome of KNU-07 was found to be 15,038 nucleotides in length, which was 60 nucleotides shorter than the type 1 prototype strain Lelystad due to a notable 60-bp deletion within the nonstructural protein 2 (NSP2). The KNU-07 genome was shown to consist of a 221-nucleotide (nt) 5' untranslated region (UTR), a 14,703-nt protein-coding region, and a 114-nt 3' UTR, followed by a 42-73-bp poly(A) tail. A nucleotide sequence comparison of the KNU-07 genome with 20 complete PRRSV genomes revealed a 10.5-13.3% and 39.5-40.3% divergence from type 1 and type 2 strains, respectively, at the genome level, indicating a high similarity to the virus strains commonly identified as the European genotype. In order to investigate genetic variation and to understand the molecular evolution of the type 1 isolate in Korea, extensive phylogenetic analyses were performed using the ORF5 and ORF7 nucleotide sequences of published type 1 PRRSV isolates. The data further indicated that the newly emerging type 1 isolate KNU-07 belongs to the recently proposed pan-European subtype 1. Taken together, the results of this study describe the genomic characterization of the type 1 PRRSV isolated in South Korea, suggesting a recent introduction of the virus typical for this genotype that has commonly appeared worldwide.
authors.affiliation: Department of Microbiology, Kyungpook National University, Daegu, Republic of Korea.
authors.forename: Eeuri
authors.initials: E
authors.lastname: Nam
authors.forename: Choi-Kyu
authors.initials: CK
authors.lastname: Park
authors.forename: Seong-Hee
authors.initials: SH
authors.lastname: Kim
authors.forename: Yi-Seok
authors.initials: YS
authors.lastname: Joo
authors.forename: Sang-Geon
authors.initials: SG
authors.lastname: Yeo
authors.forename: Changhee
authors.initials: C
authors.lastname: Lee
mesh_terms: D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D016000:Cluster Analysis; D016679:Genome, Viral; D005838:Genotype; D007723:Korea; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010802:Phylogeny; D019316:Porcine respiratory and reproductive syndrome virus / Q000235:genetics* / Q000302:isolation & purification*; D012367:RNA, Viral / Q000235:genetics*; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017384:Sequence Deletion; D013552:Swine / Q000821:virology*
chemical_list: D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D012367:RNA, Viral