{
  "id": 6679227,
  "title": "A native single-transcript TnpB architecture enables efficient virus-induced genome editing and visual screening of heritable progeny harboring phenotypically silent edits",
  "url": "https://urgent.news/2026/09/10/a-native-single-transcript-tnpb-architecture-enables-efficient-virus",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-10T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.09.750255v1?rss=1"
  },
  "original_language": "en",
  "account": "TnpB, a type of ultra-compact RNA-guided nucleases, were typically utilized in separate forms to perform genome editing, resulting in larger sizes and limitations in viral delivery for plant applications. However, researchers have recently identified that the ISDra2 TnpB possesses a unique native overlapping architecture. In this structure, the reRNA sequence is found within the coding region of TnpB itself, thereby processing its own mRNA to produce functional reRNA. This enables single-transcript genome editing in plants without the need for separate reRNA expression.\n\nThe editing process requires only a 7-base pair conserved motif and a 16-20 base pair spacer directly downstream of the coding sequence, eliminating the need for exogenous ribozymes or independent guide promoters. This highly-efficient design allows for the simultaneous packaging of the editing system and a silencing module called NbPDS into a single vector known as TRV. This compact design has led to robust editing in systemic Nicotiana benthamiana tissues, creating a dual VIGE-VIGS strategy. With this approach, direct visual selection of heritable, transgene-free edited progeny can be achieved via distinct albino phenotypes. This significantly reduces the labor-intensive large-scale genotyping process, even for targets lacking inherent visible traits.",
  "summary": "TnpB are ultra-compact RNA-guided nucleases, yet most reported systems require separate expression of the nuclease and cognate reRNA, eroding their size advantage and restricting viral delivery in plants. Here we demonstrate that ISDra2 TnpB harnesses its native overlapping architecture in which the reRNA sequence resides within the 3' coding region of TnpB, processing its own mRNA to generate…",
  "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."
}