{
  "id": 8007065,
  "title": "PER2- and state-dependent transcriptional programs gate neural stem cell proliferation with niche-specific circadian autonomy",
  "url": "https://urgent.news/2026/09/17/per2-and-state-dependent-transcriptional-programs-gate-neural-stem",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-17T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.14.751519v1?rss=1"
  },
  "original_language": "en",
  "account": "Neural stem cells (NSCs) in the adult mouse brain reside largely in a quiescent state, with their activation carefully controlled to maintain a balance between neurogenesis and stem cell preservation. Circadian clocks orchestrate fundamental cellular processes, potentially governing NSC activation timing. Researchers investigated the temporal patterns of NSC activity throughout the day and discovered that core circadian clock elements BMAL1 and PER2 oscillate rhythmically in both brain regions, the subgranular zone (SGZ) of the dentate gyrus and the subventricular zone (SVZ). While both niche-derived NSCs express BMAL1 and PER2 protein, only SGZ-derived NSCs display synchronized self-sustained core clock cycles across the entire population. Comparing wild-type (WT) and PER2 knockout NSCs highlighted state-specific, circadian clock-dependent transcriptional patterns. Specific genes, ASCL1 and CCND1, emerged as potential regulators of cell-cycle coordination, with their daytime accumulation signaling a forthcoming peak during the nighttime S-phase. Crucially, the synchronization of S-phase entry in NSCs was found to be absent in PER2 knockout mice, indicating a critical reliance on external cues for temporal regulation in the SVZ. In summary, this investigation uncovers state-specific, PER2-dependent circadian control mechanisms in adult NSCs, emphasizing the niche-dependent nature of these processes and the necessity of external stimuli for proper synchronization in the SVZ.",
  "summary": "Adult neural stem cells (NSCs) in the mouse brain are predominantly quiescent, with activation tightly regulated to balance neurogenesis and stem cell maintenance. Circadian clocks temporally organize core cellular processes, potentially gating NSC activation. We examined adult NSC temporal dynamics across the day and observed rhythmic expression of core circadian clock components BMAL1 and PER2…",
  "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."
}