Homologs of vascular endothelial growth factor are encoded by the poxvirus orf virus.

Abstract:

:A gene encoding a polypeptide with homology to mammalian vascular endothelial growth factors (VEGFs) has been discovered in the genome of orf virus (OV), a parapoxvirus that affects sheep and goats and, occasionally, humans. The gene is transcribed abundantly early in infection and is found immediately outside the inverted terminal repeat at the right end of the genome. In the NZ2 strain of OV (OV NZ2), the gene encodes a polypeptide with a molecular size of 14.7 kDa, while in another strain, OV NZ7, there is a variant gene that encodes a polypeptide of 16 kDa. The OV NZ2 and OV NZ7 polypeptides show 22 to 27% and 16 to 23% identity, respectively, to the mammalian VEGFs. The viral polypeptides are only 41.1% identical to each other, and there is little homology between the two genes at the nucleotide level. Another unusual feature of these genes is their G+C content, particularly that of OV NZ7. In a genome that is otherwise 63% G+C, the OV NZ2 gene is 57.2% G+C and the OV NZ7 gene is 39.7% G+C. The OV NZ2 gene, but not the OV NZ7 gene, is homologous to the mammalian VEGF genes at the DNA level, suggesting that the gene has been acquired from a mammalian host and is undergoing genetic drift. The lesions induced in sheep and humans after infection with OV show extensive dermal vascular endothelial proliferation and dilatation, and it is likely that this is a direct effect of the expression of the VEGF-like gene.

journal_name

J Virol

journal_title

Journal of virology

authors

Lyttle DJ,Fraser KM,Fleming SB,Mercer AA,Robinson AJ

doi

10.1128/JVI.68.1.84-92.1994

subject

Has Abstract

pub_date

1994-01-01 00:00:00

pages

84-92

issue

1

eissn

0022-538X

issn

1098-5514

journal_volume

68

pub_type

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