{
  "id": 1554333,
  "title": "A Neurotomographic Approach for Mesoscale Mapping of Neural Circuits",
  "url": "https://urgent.news/2026/08/17/a-neurotomographic-approach-for-mesoscale-mapping-of-neural-circuits",
  "topic": "ai",
  "section": "AI",
  "published": "2026-08-17T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.11.743991v1?rss=1"
  },
  "original_language": "en",
  "account": "The integration of neural information from multiple projection sources occurs within brain regions. At the mesoscale, neural projections have the potential to cross hemispheres and extend along the rostrocaudal axis, making it challenging to map their entirety. To tackle this challenge, researchers have developed a new method for mapping mesoscale connectivity in living and preserved mice brains.\n\nIn this innovative approach, colloidal gold is bound to a retrograde tracer known as wheat-germ agglutinin apo-horseradish peroxidase (WGA-HRP). After stereotactic injection of the gold-bound tracer (WAHG) into the mouse forebrain, micro-computed tomography (micro-CT) imaging is employed to capture the spatial distribution of the tracer in both living and preserved brains. Three-dimensional reconstruction of the tracer distribution is then generated from the imaging data.\n\nTo validate the accuracy of the neurotomographic approach, histological processing of the brains using silver enhancement to label gold particles is conducted. This allows for a direct comparison between the histological labeling and the neurotomographic images. The results demonstrate that micro-CT imaging can reveal the major spatial distributions of the gold-bound tracer, and these distributions are consistent across in vivo and ex vivo imaging conditions.\n\nFurthermore, the neurotomographically determined patterns align with the labeling observed in histologically processed tissue. The major sites of labeling are reliably detected in the reconstructed neurotomographic images, highlighting the potential of this novel method for non-destructive, three-dimensional mapping of neural tracers in living organisms. This approach can potentially facilitate targeted multi-site recordings, validate injection site placement, and enable rapid longitudinal connectomic analyses in vivo.",
  "summary": "Brain regions integrate neural information arriving from several convergent projection sources. At the mesoscale level, neural projections can potentially span both hemispheres and extend along the entire rostrocaudal axis, which complicates efforts to map their full extent. To address this issue, we describe a novel method for mapping such mesoscale connectivity in vivo and ex vivo. Our…",
  "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."
}