{
  "slug": "epigenetic-mechanisms-of-retroviral-regulation-a-comparative-r-41634739",
  "source": {
    "title": "Epigenetic mechanisms of retroviral regulation: a comparative review.",
    "journal": "Epigenetics & chromatin",
    "year": 2026,
    "doi": "10.1186/s13072-025-00659-6",
    "pmid": "41634739",
    "content_access_status": "FULL_TEXT_OA"
  },
  "claims": [
    {
      "statement": "This article is a comparative review based on PubMed literature searches, not a primary FeLV experiment.",
      "epistemic_type": "EVIDENCE",
      "evidence_level": "D",
      "confidence": "100",
      "evidence_excerpt": "Literature searches were conducted in PubMed using keywords (e.g. HIV, MLV, retroviral epigenetics, histone modifications, DNA methylation, etc.). Articles addressing epigenetic modifications relevant to proviral control both pre- and post-integration were selected for review.",
      "review_status": "PASSED"
    },
    {
      "statement": "The review states that FeLV is among gammaretrovirus-related examples considered in the comparative discussion.",
      "epistemic_type": "EVIDENCE",
      "evidence_level": "D",
      "confidence": "95",
      "evidence_excerpt": "Gammaretroviruses, who have endogenous counterparts such as Feline Leukemia Virus (FeLV) and the Koala Retrovirus (KoRV), have been characterized in terms of their control by Krüppel-associated box-containing (KRAB) zinc finger proteins and non-coding RNAs.",
      "review_status": "PASSED"
    },
    {
      "statement": "The review states that epigenetic control of non-human retroviruses is less explored than HIV-1 and may provide insight into HIV-1 mechanisms.",
      "epistemic_type": "EVIDENCE",
      "evidence_level": "D",
      "confidence": "100",
      "evidence_excerpt": "However, epigenetic mechanisms of pre-integration latency or T cell control of the virus are less studied in HIV-1 infection. Epigenetic control of non-human retroviruses is even less explored, despite the fact they can provide a window into pertinent mechanisms for understanding HIV-1.",
      "review_status": "PASSED"
    },
    {
      "statement": "The review states that comparative studies focus on three incompletely understood layers of retroviral regulation: pre-integration latency, post-integration latency and T cell-mediated control of proviral expression.",
      "epistemic_type": "EVIDENCE",
      "evidence_level": "D",
      "confidence": "100",
      "evidence_excerpt": "These comparative insights highlight three complementary layers of retroviral regulation that remain incompletely understood in HIV-1 but are illuminated by studies in other systems—including the koala retrovirus (KoRV), a uniquely informative model of an endogenizing gammaretrovirus: (1) pre-integration latency, (2) post-integration latency, and (3) T cell–mediated control of proviral expression.",
      "review_status": "PASSED"
    },
    {
      "statement": "The review states that FIV, not FeLV, has published evidence of histone modification differences at the proviral promoter during latency and reactivation.",
      "epistemic_type": "EVIDENCE",
      "evidence_level": "D",
      "confidence": "100",
      "evidence_excerpt": "McDonnel et al . explored histone modifications associated with the proviral promoter during latency and following in vitro reactivation using ChIP-qPCR of the 5' LTR and discovered a decrease in histone acetylation (H3K9ac and H3K14ac) and increased repressive H3K27me3 when compared to reactivated proviruses [ 250 ].",
      "review_status": "PASSED"
    },
    {
      "statement": "Whether the comparative epigenetic mechanisms discussed for MLV, KoRV, FIV, SIV or HIV-1 apply directly to FeLV remains unresolved in this source.",
      "epistemic_type": "OPEN_QUESTION",
      "evidence_level": null,
      "confidence": "90",
      "evidence_excerpt": null,
      "review_status": "PASSED"
    }
  ],
  "provenance": {
    "agent": "AVAPROJECT-VIROLOGY-001",
    "critic": "AVAPROJECT-CRITIC-001",
    "model": "openai-codex",
    "updated": "2026-09-05 17:24 UTC",
    "updated_iso": "2026-09-05T17:24:54Z"
  }
}