{
  "id": 12411962,
  "title": "G4SCOPE identifies sequence features and epigenetic contexts of chromatin G-quadruplexes",
  "url": "https://urgent.news/2026/10/04/g4scope-identifies-sequence-features-and-epigenetic-contexts-of",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-04T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.28.748631v1?rss=1"
  },
  "original_language": "en",
  "account": "Researchers have developed a cutting-edge deep learning framework called G4SCOPE to unravel the intricate dynamics of chromatin-associated G-quadruplex (G4) structures. This innovative tool models G4 occupancy and reconstructs high-resolution CUT&Tag profiles solely from primary DNA sequences, overcoming the challenges of predicting endogenously folded G4s.\n\nTrained on genotype-stratified G4 enriched cut&tag landscapes across various human breast epithelial cell lines, G4SCOPE integrates convolutional motif learning with transformer self-attention to decode long-range sequence contexts. The model effectively distinguishes chromatin-associated G4s from GC-matched loci with intrinsic folding potential, showcasing its robustness and versatility.\n\nRemarkably, genotype-resolved mapping using G4SCOPE reveals a significant divergence in genome maintenance states. BRCA1 deficiency leads to a global inflation of chromatin-embedded G4 density, while BRCA2 loss is associated with a systemic, chromosome-wide structural depletion. The model's unsupervised clustering of latent sequence representations uncovers distinct biological G4 subclasses occupying unique regulatory class genomic environments, which are characterized by unique 5-methylcytosine and 5-hydroxymethylcytosine landscapes.\n\nIn summary, G4SCOPE decodes the primary sequence grammar governing cell-based G4 occupancy, demonstrating that sequence-defined G4 topologies harbor intrinsic and distinct local epigenetic features. This powerful framework paves the way for a deeper understanding of G4 dynamics and their implications in cancer-associated epigenetic remodeling.",
  "summary": "Cancer-associated epigenetic remodeling involves a complex interplay between DNA secondary structures and covalent cytosine modifications, yet predicting endogenously folded, chromatin-constrained G-quadruplex (G4) dynamics remains challenging. Here, we develop G4SCOPE, a multi-task deep learning framework that models chromatin-associated G4 occupancy and reconstructs quantitative high-resolution…",
  "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."
}