{
  "id": 5484529,
  "title": "Functional decoding reveals a hidden regulatory layer of the Salmonella transcriptome during infection",
  "url": "https://urgent.news/2026/09/03/functional-decoding-reveals-a-hidden-regulatory-layer-of-the",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-03T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.02.748214v1?rss=1"
  },
  "original_language": "en",
  "account": "Salmonella enterica, the causative agent of typhoid fever and salmonellosis, employs a vast, previously unexplored regulatory layer within its transcriptome during infection of host cells. A team of researchers has devised a high-throughput screening technique to uncover the functional significance of this hidden regulatory network. By generating a pooled library of 875 RNA fragments produced under infection-relevant conditions, the scientists were able to pinpoint specific regulatory activities that influence the bacterium's ability to invade and survive within its host's macrophages.\n\nThe screening process revealed stage-specific regulatory elements that differially modulate virulence-associated programs encoded within the SPI-1, SPI-4, and SPI-2 pathogenicity islands. Two key non-canonical sRNAs originating from the 5' untranslated regions of these islands were identified. One of these sRNAs suppresses the SPI-1 and SPI-4 secretion systems, which are crucial for bacterial adhesion and invasion. Concurrently, the other sRNA promotes invasion-associated programs while simultaneously repressing pathways that facilitate intracellular survival.\n\nThese findings demonstrate that Salmonella's regulatory activities extend beyond the direct control of individual virulence factors, highlighting a broader, posttranscriptional layer of gene regulation. This emerging regulatory network enables the bacterium to rapidly adapt to the varying demands posed by the host environment during infection. The researchers' methodology provides a scalable framework for extracting functional regulatory information from bacterial transcriptomes under specific conditions, offering a valuable tool for elucidating the complex host-pathogen interactions that drive disease progression.",
  "summary": "Bacterial transcriptomes contain extensive, largely unexplored regulatory information beyond annotated genes, including small regulatory RNAs (sRNAs), yet distinguishing functionally active transcripts from the broader non-coding transcriptome remains a fundamental challenge, particularly in the context of host-pathogen interactions. Here, we develop an unbiased highthroughput functional…",
  "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."
}