PERT: Prime Editing tRNAs for Nonsense Mutations

Music:
Enjoy the music based on this article at the end of the episode.

DOI:
10.1038/s41586-025-09732-2

License:
This episode is based on an open-access article published under the Creative Commons Attribution 4.0 International License (CC BY 4.0) – https://creativecommons.org/licenses/by/4.0/

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Episode link: https://basebybase.com/episodes/pert-prime-editing-trnas-for-nonsense-mutations

️ Episode:
209: PERT: Prime Editing tRNAs for Nonsense Mutations

️ Season:
1

Article title:
Prime editing-installed suppressor tRNAs for disease-agnostic genome editing

Journal:
Nature

QC:
This episode was checked against the original article PDF and publication metadata for the episode release published on 2025-11-25.

QC Scope:
- article metadata and core scientific claims from the narration
- excludes analogies, intro/outro, and music
- transcript coverage: Substantively audited the core scientific narrative: disease-burden framing, PERT mechanism, sup-tRNA optimization, endogenous-locus installation, cell-model rescues (Batten/Tay-Sachs/NPC1), Hurler in vivo outcomes, ClinVar readthrough scope, safety/off-target analyses, and delivery considerations.
- transcript topics: Disease burden and need for disease-agnostic therapy; PERT concept: suppressor tRNA readthrough; sup-tRNA optimization: leader, body, terminator; saturation mutagenesis; Single-locus endogenous tRNA installation via prime editing; In vitro rescue in Batten (TPP1), Tay-Sachs (HEXA), NPC1 models; ClinVar PTC readthrough across 14,746 cases

QC Summary:
- factual score: 10/10
- metadata score: 10/10
- supported core claims: 7
- claims flagged for review: 0
- metadata checks passed: 4
- metadata issues found: 0

Metadata Audited:
- article_doi
- article_title
- article_journal
- license

Factual Items Audited:
- One-step endogenous installation of optimized sup-tRNA at a single genomic locus via PE (PERT).
- In human cell models, 20–70% restoration of normal enzyme activity for Batten (TPP1), Tay–Sachs (HEXA), and Niemann–Pick (NPC1).
- Hurler syndrome mouse model showed ≈6% IDUA enzyme activity restoration and near-complete rescue of pathology.
- Broad readthrough across ClinVar PTCs: 69% ± 30% readthrough score across 14,746 pathogenic PTCs.
- Off-target editing not observed above background in genome-wide analyses; no significant off-target events detected.
- No detectable readthrough of natural stop codons (NTCs) or major transcriptome/proteome perturbations.

QC result: Pass.