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M9550192.TXT
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1995-03-04
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Document 0192
DOCN M9550192
TI Biological and genetic changes in ovine lentivirus strains following
passage in isogeneic twin lambs.
DT 9505
AU Woodward TM; Carlson JO; de la Concha-Bermejillo A; DeMartini JC;
Department of Pathology, Colorado State University, College of;
Veterinary Medicine and Biomedical Sciences, Fort Collins 80523.
SO J Acquir Immune Defic Syndr Hum Retrovirol. 1995 Feb 1;8(2):124-33.
Unique Identifier : AIDSLINE MED/95135990
AB Ovine lentivirus (OvLV) strains vary in cytopathogenicity, but the
correlation, if any, between viral cytophenotypes and in vivo
pathogenicity is poorly understood. To examine this issue and to
evaluate changes in OvLV strains following passage in vivo, biological
and genetic characteristics of OvLV isolates following in vivo passage
were compared with those of the parent strain used for inoculation of
two sets of isogeneic twin lambs. Plaque-purified OvLV strains with
slow/low (84/28) and rapid/high (85/34) cell culture phenotypes were
used for inoculation of the lambs. The phenotypes of the parent OvLV
strains were compared with virus isolates from the four lambs by
assaying virus replication and cytopathogenicity in goat synovial
membrane cells. Viral population genetic differences in the env region
were compared by polymerase chain reaction (PCR) amplification and
denaturing gradient gel electrophoresis (DGGE) of the fragments. Virus
isolates recovered from rapid/high virus-infected sheep were more lytic
and developed syncytia earlier than viruses reisolated from sheep
inoculated with the slow/low strain. Isolates from lambs infected with
84/28 were more cytopathic in all assays than was their parent strain.
Isolates from animals infected with 85/34 were more lytic and
syncytiogenic than the parent strain, but responded similarly in
replication assays. Although there were no consistent phenotypic
differences between virus isolates recovered from sets of twins with
markedly different degrees of lymphoid interstitial pneumonia (LIP), the
DGGE band patterns of PCR amplified env fragments of the virus isolates
from the twin lamb set with severe LIP, but not the set with slight LIP,
were distinctly different from those of the parental viruses.
DE Animal Base Sequence Cytopathogenic Effect, Viral Genes,
env/*GENETICS Molecular Sequence Data Pneumonia, Progressive
Interstitial, of Sheep/*VIROLOGY Serial Passage Sheep Support, U.S.
Gov't, Non-P.H.S. Support, U.S. Gov't, P.H.S. Twin Studies Twins,
Monozygotic *Variation (Genetics) Virus Replication Visna-Maedi
Virus/GROWTH & DEVELOPMENT/*GENETICS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).