Insights about minority HIV-1 strains in transmitted drug resistance mutation dynamics and disease progression

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Objectives: The presence of minority transmitted drug resistance mutations was assessed using ultra-deep sequencing and correlated with disease progression among recently HIV-1-infected individuals from Brazil. Methods: Samples at baseline during recent infection and 1 year after the establishment of the infection were analysed. Viral RNA and proviral DNA from 25 individuals were subjected to ultra-deep sequencing of the reverse transcriptase and protease regions of HIV-1. Results: Viral strains carrying transmitted drug resistance mutations were detected in 9 out of the 25 patients, for all major antiretroviral classes, ranging from one to five mutations per patient. Ultra-deep sequencing detected strains with frequencies as low as 1.6% and only strains with frequencies.20% were detected by population plasma sequencing (three patients). Transmitted drug resistance strains with frequencies,14.8% did not persist upon established infection. The presence of transmitted drug resistance mutations was negatively correlated with the viral load and with CD4+T cell count decay. Conclusions: Transmitted drug resistance mutations representing small percentages of the viral population do not persist during infection because they are negatively selected in the first year after HIV-1 seroconversion.
Leda AR, Hunter J, Oliveira UC, Junqueira-de-Azevedo ILM, Araripe Sucupira MC, Diaz RS. Insights about minority HIV-1 strains in transmitted drug resistance mutation dynamics and disease progression. J. Antimicrob. Chemother.. 2018 Jul;73(7):1930-4. doi:10.1093/jac/dky132.
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