Abstract
Molecular epidemiology can be used to identify human immunodeficiency virus (HIV) transmission clusters, usually using pol sequence for analysis. In the present study, we explored appropriate parameters to construct a simple network using HIV env and gag sequences instead of pol sequences for constructing a phylogenetic tree and a genetic transmission subnetwork, which were used to identify individuals with many potential transmission links and to explore the evolutionary dynamics of the virus among men who have sex with men (MSM) in Beijing. We investigated 70 acute HIV-1 infections, which consisted of HIV-1 subtype B (15.71%), the circulating recombinant forms CRF01_AE (47.14%), CRF07_BC (21.43%), CRF55_01B (1.43%), and CRF65_cpx (4.29%), and an unknown subtype (10.00%). By exploring the similarities and differences among HIV env, gag and pol sequences in describing the dynamics of the HIV-1 CRF01_AE transmission subnetwork among Beijing MSM, we found that four key points of the env sequences (strains E-2011_BJ.CY_16014, E-2011_BJ.FT_16017, E-2011_BJ.TZ_16064, and E-2011_BJ.XW_16035) contained more transmission information than gag sequences (three key points: strains G-2011_BJ.CY_16014, G-2011_BJ.FT_16017, and G-2011_BJ.XW_16035) and pol sequences (two key points: strains P-2011_BJ.CY_16014 and P-2011_BJ.XW_16035). Although the env and gag sequence results were similar to pol sequences in describing the dynamics of the HIV-1 CRF01_AE transmission subnetwork, we were able to obtain more precise information, allowing identification of key points of subnetwork expansion, based on HIV env and gag sequences instead of pol sequences. Taken together, the key points we found will improve our current understanding of how HIV spreads between MSM populations in Beijing and help to better target preventative interventions for promoting public health.
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Acknowledgements
This work was supported by the National Science and Technology Major Project of the 12th Five-Year Plan (No. 2012ZX10001001-001), China-US Cooperation Global AIDS Program (2016 to 2017, 4.2), the Funding for Chinese overseas talents returning to China in 2016 (B.S.), the Capital Health Research and Development of Special Found (2016-1-2182), the Beijing Municipal of Science and Technology Major Project (D141100000314002, D141100000314005, D161100000416002), the National Natural Science Foundation of China (81571973, 81601795), the Beijing Municipal Administration of Hospitals’ Youth Program (QML20161702), the Basic-Clinical Research Cooperation Fund of Capital Medical University (16JL18, 17JL20), and the Beijing Key Laboratory for HIV/AIDS Research (BZ0089).
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JY, WX, BS, and MQ conceived the study, designed the experiments, and analyzed the data. ZZ, LD, KF, and FY performed the experiments; YJ, LL, WX, JY, WX, LS, TZ, and HW contributed reagents and materials; and ZZ, BS, and MQ wrote the article. All authors read and approved the final manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the Beijing You’an Hospital research ethics committee and the National Center for AIDS/STD Control and Prevention, China CDC, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Zhang, Z., Dai, L., Jiang, Y. et al. Transmission network characteristics based on env and gag sequences from MSM during acute HIV-1 infection in Beijing, China. Arch Virol 162, 3329–3338 (2017). https://doi.org/10.1007/s00705-017-3485-z
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DOI: https://doi.org/10.1007/s00705-017-3485-z