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  • Poster presentation
  • Open Access

Clonality of HTLV-2 in natural infection

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Retrovirology201411 (Suppl 1) :P138

  • Published:


  • Peripheral Blood Mononuclear Cell
  • Integration Site
  • Clonal Expansion
  • Host Genome
  • Clonal Survival

We recently developed a high-throughput sequencing method for analysis and quantification of HTLV-1 integration sites in the host genome (Gillet et al, 2011, Blood). Using this method we investigated the effect of the genomic environment on integration targeting, clonal expansion and spontaneous HTLV-1 proviral expression (Gillet et al, 2011, Blood, Melamed et al, 2013, PLoS Pathogens). HTLV-2 preferentially infects CD8+ T cells, with a minority of the proviral load in CD4+ T cells. Here we describe the use of our high-throughput technique to investigate the distribution of HTLV-2 proviral integration sites in the host genome, in peripheral blood mononuclear cell (PBMC) DNA of HTLV-2 infected individuals (n=28). We also mapped and quantified proviral integration sites separately in flow-sorted CD4+CD8- and CD4-CD8+ populations. We quantified the clone frequency distribution and clonal survival over time in 10 individuals, using samples from 2 time points separated by a median of 10 years. The results show that the clone frequency distribution of HTLV-2 in PBMCs is distinct from that of HTLV-1 and resembles that of HTLV-1-infected CD8+ T cells. These results suggest that in both HTLV-1 and HTLV-2 infections, there is a greater degree of selective oligoclonal clonal expansion in infected CD8+ T cells than in CD4+ T cells. We are now investigating the selection forces that underlie this dichotomy between T cell lineages.

Authors’ Affiliations

Section of Immunology, Imperial College London, Wright-Fleming Institute, Norfolk Place, London, UK
Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff, Wales, UK
Illumina, Chesterford Research Park, Essex, Little Chesterford, UK
University of California San Francisco, California, USA
Section of Infectious Diseases, Imperial College London, Wright-Fleming Institute, Norfolk Place, London, UK


© Melamed et al; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.