{
  "id": 10749783,
  "title": "HIV-1 prime-boost vaccination shapes distinct clonal trajectories and memory precursor states of Env- and Gag-specific T cells",
  "url": "https://urgent.news/2026/09/29/hiv-1-prime-boost-vaccination-shapes-distinct-clonal-trajectories-and",
  "topic": "health",
  "section": "Health & Medicine",
  "published": "2026-09-29T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.23.752815v1?rss=1"
  },
  "original_language": "en",
  "account": "For decades, researchers have struggled to understand the clonal and cellular factors that lead to long-lasting T cell memory induced by HIV-1 vaccines. In a recent study, scientists combined advanced T cell receptor identification, longitudinal sequencing, and single-cell multi-omics to analyze the memory precursor T cells generated by the HIV Vaccine Trials Network 505 DNA prime-recombinant adenovirus serotype 5 (rAd5) booster vaccine (DNA/rAd5). By developing a scalable, high-throughput method to detect HIV-1 Env- and Gag-specific TCRs, the researchers identified unique patterns in the expansion, survival, and impact on memory between Env- and Gag-specific CD8 T cell responses. The DNA prime and rAd5 boost sequences produced different outcomes for these cell populations, with rAd5-specific clones making up a larger proportion of Gag-specific memory precursors compared to the Env-specific response. Further single-cell analysis revealed separate memory precursor states, with Env-specific responses having a higher proportion of cytotoxic effector-memory (EM) CD8 T cells and Gag-specific responses featuring a greater number of cycling/proliferative cells. In summary, this research reveals that the heterologous DNA/rAd5 vaccine regimen creates distinct clonal trajectories and cellular programs in the immune system, offering fresh insights into how vaccine platform and antigen specificity affect the long-term durability and functional characteristics of HIV-1-specific cellular immunity.",
  "summary": "Despite decades of HIV-1 vaccine development, the clonal and cellular determinants of durable vaccine-induced T cell memory remain incompletely understood. Here, we combined antigen-specific T cell receptor (TCR) identification, longitudinal TCR sequencing, and single-cell multi-omics to characterize Env- and Gag-specific memory precursor T cells elicited by the HIV Vaccine Trials Network (HVTN)…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}