{
  "id": 6850531,
  "title": "Codon usage determines tRNA-modification requirements for bacterial virulence",
  "url": "https://urgent.news/2026/09/11/codon-usage-determines-trna-modification-requirements-for-bacterial",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-11T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.09.750475v1?rss=1"
  },
  "original_language": "en",
  "account": "Bacterial virulence genes possess unique codon usage patterns that may necessitate specific tRNA modifications for efficient translation, although this relationship has not been fully elucidated. Researchers have created a map of codon-tRNA modifications in Salmonella, predicting six modifications that could facilitate virulence gene translation. Experiments in infected mice revealed that modifications at positions iA37 and C5 are required for U34, whereas essential k2C34 could not be tested. The impact of Q34, Cm32/Um32, and Cm34 was minimal, likely due to weak decoding effects in other systems. Modifications not previously predicted were also found to be unnecessary. Synonymous reporter variants, proteomics, and targeted recoding showed that specific codons in virulence-associated genes directly relied on these modifications. Moreover, four Leu-TTA codons in the ssrB gene, responsible for the master regulator of Salmonella pathogenicity island 2 (SPI-2), contributed to MiaA-dependent gene expression. Extending this analysis to other pathogens revealed both shared and unique virulence dependencies, aligning with previously documented mutant phenotypes. In summary, codon usage plays a crucial role in determining tRNA-modification requirements for bacterial virulence.",
  "summary": "Bacterial virulence genes exhibit distinctive codon usage that may impose tRNA-modification requirements for efficient translation, but a comprehensive understanding is lacking. Here, a curated codon-tRNA modification map for Salmonella predicted six modifications that could preferentially support virulence gene translation. Mutant phenotypes in infected mice confirmed requirements for iA37 and…",
  "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."
}