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Titolo:
REPEATED EMERGENCE OF EPIDEMIC EPIZOOTIC VENEZUELAN EQUINE ENCEPHALITIS FROM A SINGLE GENOTYPE OF ENZOOTIC SUBTYPE ID VIRUS/
Autore:
POWERS AM; OBERSTE MS; BRAULT AC; RICOHESSE R; SCHMURA SM; SMITH JF; KANG WL; SWEENEY WP; WEAVER SC;
Indirizzi:
UNIV TEXAS,MED BRANCH,DEPT PATHOL GALVESTON TX 77555 UNIV TEXAS,MED BRANCH,DEPT PATHOL GALVESTON TX 77555 UNIV TEXAS,MED BRANCH,CTR TROP DIS GALVESTON TX 77555 USA,MED RES INST INFECT DIS,DIV VIROL FT DETRICK MD 21702 SW FDN BIOMED RES,DEPT VIROL & IMMUNOL SAN ANTONIO TX 78245
Titolo Testata:
Journal of virology
fascicolo: 9, volume: 71, anno: 1997,
pagine: 6697 - 6705
SICI:
0022-538X(1997)71:9<6697:REOEEV>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENCEPHALOMYELITIS VIRUS; MONOCLONAL-ANTIBODIES; MOLECULAR EVIDENCE; STRAIN TC-83; GLYCOPROTEINS; ALPHAVIRUSES; COMPLEX; E2-GLYCOPROTEIN; CONSTRUCTION; SEQUENCES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
A.M. Powers et al., "REPEATED EMERGENCE OF EPIDEMIC EPIZOOTIC VENEZUELAN EQUINE ENCEPHALITIS FROM A SINGLE GENOTYPE OF ENZOOTIC SUBTYPE ID VIRUS/", Journal of virology, 71(9), 1997, pp. 6697-6705

Abstract

Venezuelan equine encephalitis (VEE) epidemics and equine epizootics occurred periodically in the Americas from the 1920s until the early 1970s, when the causative viruses, subtypes IAB and IC were postulated to have become extinct. Recent outbreaks in Columbia and Venezuela have renewed interest in the source of epidemic/epizootic viruses and their mechanism of interepizootic maintenance. We performed phylogenetic analyses of VEE virus isolates spanning the entire temporal and geographic range of strains available, using 857-nucleotide reverse transcription-PCR products including the E3 and E2 genes. Analyses indicated that epidemic/epizootic viruses are closely related to four distinct, enzootic subtype ID-like lineages. One of these lineages, which occurs in Columbia, Peru, and Venezuela, also included all of the epidemic/epizootic isolates; the remaining three ID-like lineages, which occur inPanama, Peru, Florida, coastal Ecuador, and southwestern Columbia, were apparently not associated with epizootic VEE emergence. Within the Columbia/Peru/Venezuela lineage, three distinct monophyletic groups ofepidemic/epizootic viruses were delineated, indicating that VEE emergence has occurred independently at least three times (convergent evolution). Representative, complete E2 amino acid sequences were compared to identify potential determinants of equine virulence and epizootic emergence. Amino acids implicated previously in laboratory mouse attenuation generally did not vary among the natural isolates that we examined, indicating that they probably are not involved in equine virulencechanges associated with VEE emergence. Most informative amino acids correlated with phylogenetic relationships rather than phenotypic characteristics, suggesting that VEE emergence has resulted from several distinct combinations of mutations that generate viruses with similar antigenic and equine virulence phenotype.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 08:17:22