Recombination among HIV-1 strains to form chimeric genomes, a result of infection from multiple sources, has been found with unexpectedly high frequency. However, it is unclear whether it must result from near simultaneous acquisition of two HIV-1 infections (what we will term """"""""co-infection""""""""), or if true superinfection can occur, i.e., acquisition of a second virus following the establishment of primary infection and antiretroviral immune responses. If superinfection occurs, it would suggest that the immune responses generated by natural infection or vaccine candidates may not be sufficient to block new infections. Understanding whether, how often and when superinfection occurs is therefore of enormous importance to AIDS vaccine development. In addition, the consequences of multiple source infection (what we will call """"""""dual infection"""""""") on the natural history of HIV infection have not been documented. In the proposed study, we will evaluate specimens from four longitudinal cohorts of individuals to determine: A) whether true superinfection occurs; and, B) if so, how frequently it occurs and under what circumstances; and C) whether dual infection affects the natural history of disease. Each cohort presents unique opportunities for gaining insight into these questions. They include: 1) Men and women participating in the University of Washington Primary Infection Cohort (PIC). These patients are sampled intensively over the first year of infection, and we will focus on those with sexual partners that are identified and engaged in follow-up, and who did not initiate HAART during the period of study. Analysis of this cohort will allow us to determine whether there is a transient window of susceptibility to dual infection; 2) A Male Partners Cohort (MPC) with established HIV infection prior to initiating their relationship, and who admit to having repeated engaged in unprotected anal sex. Having identified the viral strains in each sexual partner from the PIC and MPC cohorts, we can use highly sensitive, variant-specific probe sequences to identify low levels of dual infection at both early (PIC) and late (MPC) times after acquisition of primary infection; 3) The Multicenter AIDS Cohort Study (MACS) who have been followed at semiannual visits since 1984. This cohort will be uniquely valuable in determining the frequency of dual infection occurring throughout the disease process; and 4) HIV-1 seroconverters from a West African female prostitute cohort (WAC) with repeated, largely unprotected exposure to multiple HIV-1 subtypes. Analysis of this cohort will permit further evaluation of the hypothesis that dual infections are acquired early infection, and will uniquely permit evaluation of the emergence of dual infection with the same vs. different HIV-1 subtypes in a highly exposed and untreated population. In our studies, the emergence of co-infecting strains and chimeras will be identifed by genetic screening assays, including strain-specific amplification, heteroduplex tracking assay and DNA sequencing. The information obtained will be combined with analysis of T cell phenotypes, clinical status, plasma viral load and viral evolution trends to establish the relationships between dual infection, superinfection, chimera formation, and disease progression.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI047734-02
Application #
6374537
Study Section
Special Emphasis Panel (ZRG1-AARR-2 (01))
Program Officer
Williams, Carolyn F
Project Start
2000-04-01
Project End
2005-03-31
Budget Start
2001-04-01
Budget End
2002-03-31
Support Year
2
Fiscal Year
2001
Total Cost
$478,735
Indirect Cost
Name
University of Washington
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
135646524
City
Seattle
State
WA
Country
United States
Zip Code
98195
Manocheewa, Siriphan; Lanxon-Cookson, Erinn C; Liu, Yi et al. (2015) Pairwise growth competition assay for determining the replication fitness of human immunodeficiency viruses. J Vis Exp :e52610
Liu, Yi; Rao, Ushnal; McClure, Jan et al. (2014) Impact of mutations in highly conserved amino acids of the HIV-1 Gag-p24 and Env-gp120 proteins on viral replication in different genetic backgrounds. PLoS One 9:e94240
Melhem, Nada M; Smith, Kellie N; Huang, Xiao-Li et al. (2014) The impact of viral evolution and frequency of variant epitopes on primary and memory human immunodeficiency virus type 1-specific CD8? T cell responses. Virology 450-451:34-48
Moroni, Marco; Ghezzi, Silvia; Baroli, Paolo et al. (2014) Spontaneous control of HIV-1 viremia in a subject with protective HLA-B plus HLA-C alleles and HLA-C associated single nucleotide polymorphisms. J Transl Med 12:335
Dobrowsky, Terrence M; Rabi, S Alireza; Nedellec, Rebecca et al. (2013) Adhesion and fusion efficiencies of human immunodeficiency virus type 1 (HIV-1) surface proteins. Sci Rep 3:3014
Shankarappa, Raj; Mullins, James I (2013) Inferring viral population structures using heteroduplex mobility and DNA sequence analyses. J Virol Methods 194:169-77
Manocheewa, Siriphan; Swain, J Victor; Lanxon-Cookson, Erinn et al. (2013) Fitness costs of mutations at the HIV-1 capsid hexamerization interface. PLoS One 8:e66065
Rolland, Morgane; Manocheewa, Siriphan; Swain, J Victor et al. (2013) HIV-1 conserved-element vaccines: relationship between sequence conservation and replicative capacity. J Virol 87:5461-7
Herbeck, Joshua T; Rolland, Morgane; Liu, Yi et al. (2011) Demographic processes affect HIV-1 evolution in primary infection before the onset of selective processes. J Virol 85:7523-34
Le Clerc, Sigrid; Coulonges, Cédric; Delaneau, Olivier et al. (2011) Screening low-frequency SNPS from genome-wide association study reveals a new risk allele for progression to AIDS. J Acquir Immune Defic Syndr 56:279-84

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