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Journal of Clinical Microbiology, Oct 1995, 2624-2630, Vol 33, No. 10
BS Seal, DJ King and JD Bennett
Degenerate oligonucleotide primers were synthesized to amplify nucleotide
sequences from portions of the fusion protein and matrix protein genes of
Newcastle disease virus (NDV) genomic RNA that could be used
diagnostically. These primers were used in a single-tube reverse
transcription PCR of NDV genomic RNA coupled to direct nucleotide
sequencing of the amplified product to characterize more than 30 NDV
isolates. In agreement with previous reports, differences in the fusion
protein cleavage sequence that correlated genotypically with virulence
among various NDV pathotypes were detected. By using sequences generated
from the matrix protein gene coding for the nuclear localization signal,
lentogenic viruses were again grouped phylogenetically separate from other
pathotypes. These techniques were applied to compare neurotropic velogenic
viruses isolated from an outbreak of Newcastle disease in cormorants and
turkeys. Cormorant NDV isolates and an NDV isolate from an infected turkey
flock in North Dakota had the fusion protein cleavage sequence
109SRGRRQKRFVG119. The R-for-G substitution at position 110 may be unique
for the cormorant- type isolates. Although the amino acid sequences from
the fusion protein cleavage site were identical, nucleotide sequence data
correlate the outbreak in turkeys to a cormorant virus isolate from
Minnesota and not to a cormorant virus isolate from Michigan. On the basis
of sequence information, the cormorant isolates are virulent viruses
related to isolates of psittacine origin, possibly genotypically distinct
from other velogenic NDV isolates. These techniques can be used reliably
for Newcastle disease epidemiology and for prediction of pathotypes of NDV
isolates without traditional live- bird inoculations.
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
Characterization of Newcastle disease virus isolates by reverse transcription PCR coupled to direct nucleotide sequencing and development of sequence database for pathotype prediction and molecular epidemiological analysis
Southeast Poultry Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Athens, Georgia 30604, USA.
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