These authors contributed equally to the study.
HLA-Bw4 identifies a population of HIV-infected patients with an increased capacity to control viral replication after structured treatment interruption
Article first published online: 15 APR 2012
© 2012 British HIV Association
Volume 13, Issue 10, pages 589–595, November 2012
How to Cite
Stern, M., Czaja, K., Rauch, A., Rickenbach, M., Günthard, H. F., Battegay, M., Fellay, J., Hirschel, B., Hess, C. and the Swiss HIV Cohort Study Group (2012), HLA-Bw4 identifies a population of HIV-infected patients with an increased capacity to control viral replication after structured treatment interruption. HIV Medicine, 13: 589–595. doi: 10.1111/j.1468-1293.2012.01019.x
- Issue published online: 11 OCT 2012
- Article first published online: 15 APR 2012
- Manuscript Accepted: 6 MAR 2012
- Swiss National Science Foundation. Grant Numbers: 33CS30-134277, PP00P3_128461/1, 31003A_135677
- human leucocyte antigen (HLA);
- natural killer cells
After structured treatment interruption (STI) of treatment for HIV-1, a fraction of patients maintain suppressed viral loads. Prospective identification of such patients might improve HIV-1 treatment, if selected patients are offered STI.
We analysed the effect of previously identified genetic modulators of HIV-1 disease progression on patients’ ability to suppress viral replication after STI. Polymorphisms in the genes killer cell immunoglobulin-like receptor 3DLI (KIR3DL1)/KIR3DS1, human leucocyte antigen B (HLA-B) and HLA Complex P5 (HCP5), and a polymorphism affecting HLA-C surface expression were analysed in 130 Swiss HIV Cohort Study patients undergoing STI. Genotypes were correlated with viral load levels after STI.
We observed a statistically significant reduction in viral load after STI in carriers of HLA-B alleles containing either the Bw480Thr or the Bw480Ile epitope (mean adjusted effect on post-STI viral load: −0.82 log HIV-1 RNA copies/ml, P < 0.001; and −1.12 log copies/ml, P < 0.001, respectively). No significant effects were detected for the other polymorphisms analysed. The likelihood of being able to control HIV-1 replication using a prespecified cut-off (viral load increase < 1000 copies/ml) increased from 39% in Bw4-negative patients to 53% in patients carrying Bw4-80Thr, and to 65% in patients carrying Bw4-80Ile (P = 0.02).
These data establish a significant impact of HLA-Bw4 on the control of viral replication after STI.