The S2 gene of equine infectious anemia virus is dispensable for viral replication in vitro

F. Li, B. A. Puffer, R. C. Montelaro

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Equine infectious anemia virus (EIAV) contains the simplest genome among lentiviruses in that it encodes only three putative regulatory genes (S1, S2, S3) in addition to the canonical gag, pol, and env genes, presumably reflecting its limited tropism to cells of monocyte/macrophage lineage. Tat and Rev functions have been assigned to S1 and S3, respectively, but the specific function for the S2 gene has yet to be determined. Thus, the function of S2 in virus replication in vitro was investigated by using an infectious molecular vital clone, EIAV(UK). Various EIAV(UK) mutants lacking S2 were constructed, and their replication kinetics were examined in several equine cell culture systems, including the natural in vivo target equine macrophage cells. The EIAV S2 mutants showed replication kinetics similar to those of the parental virus in all of the tested primary and transformed equine cell cultures, without any detectable reversion of mutant genomes. The EIAV(UK) mutants also showed replication kinetics similar to those of the parental virus in an equine blood monocyte differentiation-maturation system. These results demonstrate for the first time that the EIAV S2 gene is not essential and does not appear to affect virus infection and replication properties in target cells in vitro.

Original languageEnglish
Pages (from-to)8344-8348
Number of pages5
JournalJournal of Virology
Volume72
Issue number10
DOIs
StatePublished - 1998

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

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