{
  "id": 13701544,
  "title": "A human CHRNA6 3' UTR variant alters the molecular environment and microRNA engagement of the adolescent VTA without changing Chrna6 transcript abundance",
  "url": "https://urgent.news/2026/10/11/a-human-chrna6-3-utr-variant-alters-the-molecular-environment-and",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-11T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.10.09.758057v1?rss=1"
  },
  "original_language": "en",
  "account": "A genetic variation in the CHRNA6 gene, which encodes the alpha6 nicotinic acetylcholine receptor subunit, has been linked to adolescent smoking behavior. This single nucleotide polymorphism (rs2304297) resides in the 3' untranslated region (UTR) of the gene. When introduced into humanized rats, the presence of either the C or G allele in this region resulted in sex- and genotype-dependent responses to nicotine exposure. However, the variant did not alter the protein sequence, leading to the mystery of how it affects the molecular environment and microRNA engagement of the adolescent ventral tegmental area (VTA). Researchers investigated the molecular consequences of this rs2304297 variation in adolescent rats and found that despite no difference in CHRNA6 transcript abundance, the G allele was associated with a distinct transcriptional signature. This signature was linked to genes involved in myelin maintenance, lipid metabolism, and genomic repair. Additionally, the G allele exhibited greater conformational flexibility in its molecular structure. Spatial colocalization of the CHRNA6 transcript with miRNA-365-5p was reduced in animals carrying two copies of the G allele, regardless of sex. However, the patterns of co-expression between these two transcripts were influenced by both genotype and sex, with sex-by-genotype interactions observed in certain groups. These findings suggest that the rs2304297 variation operates through two separate layers: the G allele influences the spatial engagement of miRNA-365-5p with the CHRNA6 transcript, while sex determines whether this engagement leads to functional regulation. This study reveals a post-transcriptional mechanism behind a non-coding nicotine addiction risk variant, demonstrating that its molecular effect can be consistent across individuals while its consequences may vary.",
  "summary": "A single nucleotide polymorphism (rs2304297) in the 3' untranslated region (UTR) of CHRNA6, encoding the alpha6 nicotinic acetylcholine receptor subunit, is associated with adolescent smoking behavior. Humanized rats carrying the 'C' or 'G' allele show sex- and genotype-dependent responses to adolescent nicotine, yet the variant does not alter the protein sequence and the mechanism has remained…",
  "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."
}