{
  "id": 7785956,
  "title": "Point mutations and complex variants impact gene expression and addiction-related behaviors in Heterogeneous Stock rats",
  "url": "https://urgent.news/2026/09/16/point-mutations-and-complex-variants-impact-gene-expression-and",
  "topic": "finance",
  "section": "Finance & Markets",
  "published": "2026-09-16T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.10.750683v1?rss=1"
  },
  "original_language": "en",
  "account": "Point mutations and complex variants play a significant role in influencing gene expression and addiction-related behaviors in Heterogeneous Stock (HS) rats. Researchers utilized short- and long-read sequencing techniques to create an extensive variant catalog within these rats, subsequently conducting joint cis-expression quantitative trait loci (cis-eQTL) mapping across five brain regions. The findings revealed that non-single nucleotide polymorphism (non-SNP) variants contributed to more than half of the primary regulatory associations identified. Many of these non-SNP variants were not effectively tagged by adjacent single nucleotide polymorphisms (SNPs) due to a lack of linkage disequilibrium (LD). Upon comparing joint and SNP-only analyses, it was discovered that over 46% of eQTL genes that were shared between the two approaches had a non-SNP lead cis-eQTL, while fewer than half were strongly linked to the corresponding lead SNP. By linking joint cis-eQTLs to complex trait associations, the researchers uncovered mechanisms that were not identified through SNP-only approaches. This highlights the critical importance of integrating various types of variants into genetic studies, providing a valuable resource for the HS rat community that enhances our understanding of gene expression and addiction-related behaviors.",
  "summary": "While various variants, including single nucleotide polymorphisms (SNPs), small insertions/deletions, short tandem repeats and structural variants, drive individual genetic differences, their influence on gene expression and complex traits remains unclear. We used short- and long-read sequencing to generate a comprehensive variant catalog in Heterogeneous Stock (HS) rats and performed joint…",
  "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."
}