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- W2119144145 abstract "The impact of pre-existing variants in hepatitis C virus (HCV) quasispecies, carrying resistance-associated mutations (RAMs), on the outcome of treatment with direct acting antiviral agents (DAA) is debated and it is complicated by the lack of knowledge of quasispecies distribution between the viral reservoir (liver) and the circulating compartment.To evaluate NS3 protease heterogeneity and presence of RAMs on baseline plasma and liver biopsy samples. Plasma dynamics were also analyzed during therapy and after its suspension.Study design Ultra-deep pyrosequencing (UDPS) was performed in two HCV genotype 1a patients who received telaprevir (TVR)-based therapy and developed treatment failure due to TVR-resistance.In both patients the baseline diversity of NS3 quasispecies in plasma was higher than in liver (183.6 × 10−4 vs 47.8 × 10−4 and 246.0 × 10−4 vs 55.0 × 10−4 nt substitution/site, respectively, p < 0.0001), but phylogenetic trees did not evidence compartmentalization between the two compartments. At baseline RAMs (i.e. V36A, T54A) were detected very low levels (range: 0.31–0.52%) in both specimen types. However, phylogenetic analyses revealed that the viral variants carrying these mutations at baseline were different from those that became fixed at breakthrough, when combined V36M + R155K, conferring high-level resistance to TVR, were observed. The frequency of resistance-associated variants declined after withdrawal of drug selective pressure.UDPS allowed extensive evaluation of quasispecies compartmentalization and of their dynamics after withdrawal of TVR. Plasma and liver NS3 quasispecies, including low level RAMs, do not show significant difference." @default.
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- W2119144145 date "2015-11-01" @default.
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- W2119144145 title "Atypical exanthems associated with HHV-6 reactivation after hematopoietic cell transplantation" @default.
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- W2119144145 doi "https://doi.org/10.1016/j.jcv.2015.09.005" @default.
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