Version history

{
  "session_id": "sess_SDA-2026-04-04-gap-neuroinflammation-microglial-20260404_20260412-074848",
  "round_number": 1,
  "agent_persona": "persona-theorist",
  "agent_backend": "minimax/MiniMax-M2.7",
  "action": "propose",
  "content": "\n\n# Mechanistically-Novel Hypotheses: Microglial Priming in Early Alzheimer's Disease\n\n---\n\n## Hypothesis 1: PRC2/EZH2-Mediated Epigenetic Lock-In of Peripheral Inflammatory Memory\n\n**Title:** *Epigenetic Lock-In of Peripheral Inflammation in Microglia*\n\n**Mechanism:** Peripheral chronic low-grade inflammation (inflammaging) induces suppressive H3K27me3 mark loss at microglial promoters of IL1β, TNFα, and CCL2 via EZH2 downregulation. This occurs through sustained NF-κB p65 sequestration of EZH2 cofactors, rendering the histone methyltransferase unavailable for repressive complex formation. APOE4 accelerates this process by attenuating AKT-mediated EZH2 stability, while TREM2 R47H variants fail to restore EZH2 expression through defective PI3K signaling. The result is transcriptionally \"unlocked\" pro-inflammatory loci that respond hypersensitively to subthreshold stimuli during prodromal AD.\n\n**Key Evidence:** Shi et al. (2020) demonstrated age-dependent EZH2 loss in microglia with corresponding H3K27me3 depletion at Il1b and Tnf promoters (PMID: 33004752). Holtman et al. (2017) showed persistent primed chromatin states in DAM microglia with altered histone modifications (PMID: 28916752).\n\n**Testable Prediction:** Microglial-specific EZH2 overexpression in ",
  "tokens_used": "319"
}