title: A comparative study of three different isolates of white spot virus.
abstract: Three separate isolates of white spot virus (WSV) purified from 3 different penaeid shrimp species from different countries were compared morphologically, biochemically, and genomically using the following techniques; negative stain electron microscopy, sodium dodecyl-sulfate polyacrylamide gel electrophoresis/western blot, and restriction fragment length polymorphism (RFLP), respectively. Under the electron microscope, the 3 isolates were indistinguishable. Their nucleoprotein cores exhibited the unique striated structure characteristic of the baculovirus-like agents associated with white spot syndrome. The dimensions of the nucleoprotein cores were also identical for all 3 isolates. SDS-PAGE gels of purified virus preparations showed all 3 to be identical in the position of at least 3 of the most prominent protein bands of WSV, with approximate molecular weights of 19, 23.5, and 27.5 kDa. Western blot analyses also revealed these 3 same protein bands in identical positions for all 3 isolates. RFLP analyses of the viral genomes using Hind III and EcoR 1 enzymes revealed that although the 3 isolates were identical when cut with EcoR I, the isolate from Penaeus japonicus from China was distinguishable from the other 2 genomes (P. monodon from Indonesia and P. setiferus from the U.S.) when cut with Hind III.
authors.affiliation: Department of Microbiology, University of Hawaii, Honolulu 96822, USA.
authors.forename: E C
authors.initials: EC
authors.lastname: Nadala
authors.forename: P C
authors.initials: PC
authors.lastname: Loh
mesh_terms: D000818:Animals; D017756:Aquaculture; D016367:Baculoviridae / Q000737:chemistry / Q000145:classification* / Q000235:genetics / Q000648:ultrastructure; D015153:Blotting, Western; D004279:DNA, Viral / Q000032:analysis; D033364:Decapoda / Q000821:virology*; D004587:Electrophoresis, Agar Gel; D004591:Electrophoresis, Polyacrylamide Gel; D009698:Nucleoproteins / Q000648:ultrastructure; D015183:Restriction Mapping; D012758:Shellfish / Q000821:virology*; D015678:Viral Structural Proteins / Q000032:analysis
chemical_list: D004279:DNA, Viral; D009698:Nucleoproteins; D015678:Viral Structural Proteins