{
  "id": 11306147,
  "title": "Ryanodine receptor cluster remodeling links COL4A2 mutation to cerebral artery dysfunction",
  "url": "https://urgent.news/2026/10/01/ryanodine-receptor-cluster-remodeling-links-col4a2-mutation-to",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-01T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.25.754477v1?rss=1"
  },
  "original_language": "en",
  "account": "A genetic mutation in COL4A2, which encodes a protein component of vascular basement membranes, has been linked to dysfunction in cerebral arteries. Researchers studied mice with a specific Col4a2+/G646D mutation to investigate the underlying mechanisms. They found that aged mice with this mutation had impaired pressure-induced myogenic tone in their cerebral pial arteries, while downstream arterioles remained functional. This suggested a selective vascular defect in the pial arteries. The study revealed that smooth muscle cells in the pial arteries of aged Col4a2+/G646D mice had increased frequency of Ca2+ signals and elevated activity of large-conductance Ca2+-activated K+ channels. While the sarcoplasmic reticulum's Ca2+ store load and the Ryr2 gene's transcript abundance remained unchanged, the researchers observed enlarged clusters of ryanodine receptors (RyR2s) within these cells using super-resolution microscopy. Furthermore, they discovered that activation of protein kinase A (PKA) led to the enlargement of RyR2 clusters, while inhibiting PKA normalized the cluster organization and restored BK channel activity. These findings highlight an age-associated, PKA-dependent nanoscale remodeling of RyR2 clusters as a previously unidentified mechanism contributing to cerebral arterial dysfunction in individuals with COL4A2-related disease.",
  "summary": "Pathogenic variants of COL4A1 and COL4A2, which encode the 1 and 2 chains of type IV collagen in vascular basement membranes, cause cerebral small vessel disease and intracerebral hemorrhage, but the signaling mechanisms that precede vascular damage remain incompletely defined. Here, we investigated cerebral arterial function in mice heterozygous for the Col4a2+/G646D mutation. Cerebral pial…",
  "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."
}