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Since HIV-1 and other retroviruses depend on lipid domains of the host cell for budding and infectivity, we investigated the possibility that Viperin also restricts human immunodeficiency virus and other retroviruses.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>Like other host restriction factors that have a broad antiviral range, we find that <jats:italic>viperin<\/jats:italic> has also been evolving under positive selection in primates. The pattern of positive selection is indicative of Viperin's escape from multiple viral antagonists over the course of primate evolution. Furthermore, we find that Viperin is interferon-induced in HIV primary target cells. We show that exogenous expression of Viperin restricts the LAI strain of HIV-1 at the stage of virus release from the cell. Nonetheless, the effect of Viperin restriction is highly strain-specific and does not affect most HIV-1 strains or other retroviruses tested. Moreover, knockdown of endogenous Viperin in a lymphocytic cell line did not significantly affect the spreading infection of HIV-1.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>Despite positive selection having acted on Viperin throughout primate evolution, our findings indicate that Viperin is not a major restriction factor against HIV-1 and other retroviruses. Therefore, other viral lineages are likely responsible for the evolutionary signatures of positive selection in <jats:italic>viperin<\/jats:italic> among primates.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1742-4690-9-55","type":"journal-article","created":{"date-parts":[[2012,6,27]],"date-time":"2012-06-27T13:10:36Z","timestamp":1340802636000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["The function and evolution of the restriction factor viperin in primates was not driven by lentiviruses"],"prefix":"10.1186","volume":"9","author":[{"given":"Efrem S","family":"Lim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lily I","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Harmit S","family":"Malik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Emerman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2012,6,26]]},"reference":[{"key":"2882_CR1","doi-asserted-by":"publisher","first-page":"e1000301","DOI":"10.1371\/journal.pbio.1000301","volume":"8","author":"M Emerman","year":"2010","unstructured":"Emerman M, Malik H: Paleovirology\u2013modern consequences of ancient viruses. 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