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Journal of Virology, October 1999, p. 8713-8719, Vol. 73, No. 10
Laboratory of Persistent Viral Diseases,
Rocky Mountain Laboratories, National Institute of Allergy and
Infectious Diseases, Hamilton, Montana 59840
Received 10 May 1999/Accepted 25 June 1999
Aleutian mink disease parvovirus (ADV) is the etiological agent of
Aleutian disease of mink. Several ADV isolates have been identified
which vary in the severity of the disease they elicit. The isolate
ADV-Utah replicates to high levels in mink, causing severe
Aleutian disease that results in death within 6 to 8 weeks, but does
not replicate in Crandell feline kidney (CrFK) cells. In contrast,
ADV-G replicates in CrFK cells but does not replicate in mink. The
ability of the virus to replicate in vivo is determined by virally
encoded determinants contained within a defined region of the
VP2 gene (M. E. Bloom, J. M. Fox, B. D. Berry, K. L. Oie, and J. B. Wolfinbarger. Virology
251:288-296, 1998). Within this region, ADV-G and ADV-Utah differ at
only five amino acid residues. To determine which of these five
amino acid residues comprise the in vivo replication determinant,
site-directed mutagenesis was performed to individually
convert the amino acid residues of ADV-G to those of ADV-Utah. A virus
in which the ADV-G VP2 residue at 534, histidine (H), was converted to
an aspartic acid (D) of ADV-Utah replicated in CrFK cells as
efficiently as ADV-G. H534D also replicated in mink, causing transient
viremia at 30 days postinfection and a strong antibody response.
Animals infected with this virus developed diffuse hepatocellular
microvesicular steatosis, an abnormal accumulation of intracellular
fat, but did not develop classical Aleutian disease. Thus, the
substitution of an aspartic acid at residue 534 for a histidine allowed
replication of ADV-G in mink, but the ability to replicate was not
sufficient to cause classical Aleutian disease.
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Replication of Aleutian Mink Disease Parvovirus In
Vivo Is Influenced by Residues in the VP2 Protein
*
Corresponding author. Mailing address: 903 S. 4th St.,
Hamilton, MT 59840. Phone: (406) 363-9284. Fax: (406) 363-9286. E-mail: jfox{at}niaid.nih.gov.
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