title: Restriction enzyme analysis of American region dengue viruses.
abstract: Restriction fragment heterogeneity of Hae III digestion products of cDNA to virion RNA was used to map the distribution of dengue virus topotypes found in the American region. By comparing the electrophoretic patterns of fragments produced, dengue virus isolates were placed in groups that agreed with those previously determined by oligonucleotide fingerprinting. Dengue-1 and dengue-4 viruses occur throughout the western hemisphere as single genetic types, with most of the isolates sharing at least 70% of their Hae III restriction enzyme fragments. Dengue-2 virus exists as two topotypes in the region with apparently non-overlapping distributions. The Puerto Rico topotype, which has been in the Caribbean for at least 40 years, is genetically diverse, while the Jamaica topotype, first isolated in 1981, is more homogeneous and has expanded its range from the original Caribbean focus to South America.
authors.affiliation: Centers for Disease Control and Prevention, Division of Vector-Borne Infectious Diseases, San Juan, Puerto Rico.
authors.forename: V
authors.initials: V
authors.lastname: Vorndam
authors.forename: R M
authors.initials: RM
authors.lastname: Nogueira
authors.forename: D W
authors.initials: DW
authors.lastname: Trent
mesh_terms: D000330:Aedes; D000569:Americas; D000818:Animals; D002478:Cells, Cultured; D003716:Dengue Virus / Q000145:classification* / Q000235:genetics; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism; D006801:Humans
chemical_list: D015252:Deoxyribonucleases, Type II Site-Specific; C024403:GGCC-specific type II deoxyribonucleases