Abrao Ferreira – Grant/Research Support: ABBOTT, ROCHE, BMS, JANS

Abrao Ferreira – Grant/Research Support: ABBOTT, ROCHE, BMS, JANSSEN; Speaking and Teaching: ROCHE, BMS, JANSSEN Djamal Abdurakhmanov – Grant/Research Support: Roche; Speaking and Teaching: BMS, Jansenn, MSD, Novartis Giovanni B. Gaeta – Advisory Committees or Review Panels: Janssen, Merk, BMS, Novartis, Gilead, Roche, Janssen, Merk, BMS, Novartis, Gilead, Roche, Janssen, Merk, BMS, Novartis, Gilead, Roche, Janssen, Merk, BMS, Novartis, Gilead, Roche Filip Beeldens – Employment:

Janssen Research and Development Wafae Iraqi – Employment: Janssen Ralph DeMasi – Management Position: Johnson and Johnson Andrew Hill – Consulting: Janssen Joerg M. Lauffer – Employment: Janssen; Stock Shareholder: Janssen Isabelle Lonjon-Domanec – Employment: Janssen Massimo Colombo – Advisory Committees or Review Panels: BRISTOL-MEYERS- SCHERING-PLOUGH, ROCHE, GIlEaD, Ja’nssen Cilag, Achillion; Pembrolizumab mouse Grant/Research Support: BRISTOL-MEYERS-SQUIBB,

ROCHE, GILEAD, BRISTOLMEYERS-SQUIBB, ROCHE, GILEAD; Speaking and Teaching: Glaxo Smith-Kline, BRISTOL-MEYERS-SQUIBB, SCHERING-PLOUGH, Enzalutamide mouse ROCHE, NOVARTIS, GILEAD, VERTEX, Glaxo Smith-Kline, BRISTOL-MEYERS-SQUIBB, SCHERING-PLOUGH, ROCHE, NOVARTIS, GILEAD, VERTEX The following people have nothing to disclose: Petr Urbanek, Christophe Moreno, Inmaculada Fernandez, Adrian Streinu-Cercel Hepatitis C virus (HCV) exists as a quasispecies (QS) of related genetic variants. QS are thought to be an important factor in the evasion of the host immune response and the maintenance of chronic infection. Furthermore, a number of studies have demonstrated associations between medchemexpress QS complexity and diversity in the hypervariable region 1(HVR1) and sustained viral response to treatment. Many of these studies have either been retrospective, focused on acute infection, or post transplant changes and most have used variable sampling intervals of many months if not years. We recruited and sampled

the HCV HVR1 QS in 20 chronically infected individual at fortnightly for a total of 16 weeks. We analysed QS diversity, complexity, and divergence for a per sample mean of 16 (12-24) HVR1 clones which had been created using nested PCR. QS change was visualized using both phyelogenetic trees and median joining networks. We examined the samples for evidence of selection at both HVR1 wide and codon level. Finally, we investigated for evidence of multiple subpopulations. We demonstrate statistically significant less QS diversity and complexity in HVR1 QS in patients with cirrhosis (p<0.01). A number of cirrhotic patients maintain a homogenous QS profile for the entire study period which contrasts with non cirrhotic patients where marked change is found.

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