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Tracing HIV-1 transmission: envelope traits of HIV-1 transmitter and recipient pairs.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Oberle Corinna S, Joos Beda, Rusert Peter, Campbell Nottania K, Beauparlant David, Kuster Herbert, Weber Jacqueline, Schenkel Corinne D, Scherrer Alexandra U, Magnus Carsten, Kouyos Roger, Rieder Philip, Niederöst Barbara, Braun Dominique L, Pavlovic Jovan, Böni Jürg, Yerly Sabine, Klimkait Thomas, Aubert Vincent, Trkola Alexandra, Metzner Karin J, Günthard Huldrych F, Swiss HIV Cohort Study (SHCS),
Project Swiss HIV Cohort Study (SHCS)
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Original article (peer-reviewed)

Journal Retrovirology
Volume (Issue) 13(1)
Page(s) 62 - 62
Title of proceedings Retrovirology
DOI 10.1186/s12977-016-0299-0

Open Access

URL https://doi.org/10.1186/s12977-016-0299-0
Type of Open Access Publisher (Gold Open Access)

Abstract

Mucosal HIV-1 transmission predominantly results in a single transmitted/founder (T/F) virus establishing infection in the new host despite the generally high genetic diversity of the transmitter virus population. To what extent HIV-1 transmission is a stochastic process or driven by selective forces that allow T/F viruses best to overcome bottlenecks in transmission has not been conclusively resolved. Building on prior investigations that suggest HIV-1 envelope (Env) features to contribute in the selection process during transmission, we compared phenotypic virus characteristics of nine HIV-1 subtype B transmission pairs, six men who have sex with men and three male-to-female transmission pairs. All recipients were identified early in acute infection and harbored based on extensive sequencing analysis a single T/F virus allowing a controlled analysis of virus properties in matched transmission pairs. Recipient and transmitter viruses from the closest time point to transmission showed no signs of selection for specific Env modifications such as variable loop length and glycosylation. Recipient viruses were resistant to circulating plasma antibodies of the transmitter and also showed no altered sensitivity to a large panel of entry inhibitors and neutralizing antibodies. The recipient virus did not consistently differ from the transmitter virus in terms of entry kinetics, cell-cell transmission and replicative capacity in primary cells. Our paired analysis revealed a higher sensitivity of several recipient virus isolates to interferon-α (IFNα) which suggests that resistance to IFNα cannot be a general driving force in T/F establishment. With the exception of increased IFNα sensitivity, none of the phenotypic virus properties we investigated clearly distinguished T/F viruses from their matched transmitter viruses supporting the notion that at least in subtype B infection HIV-1 transmission is to a considerable extent stochastic.
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