205: Ancient RNA Expression Profiles from the Woolly Mammoth

Ancient RNA Expression Profiles from the Woolly Mammoth

Music:
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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:
205: Ancient RNA Expression Profiles from the Woolly Mammoth

️ Season:
1

Article title:
Ancient RNA Expression Profiles from the Woolly Mammoth

Journal:
Cell

DOI:
10.1016/j.cell.2025.10.025

QC:
This episode was checked against the original article PDF and publication metadata for the episode release published on 2025-11-21.

QC Scope:
- article metadata and core scientific claims from the narration
- excludes analogies, intro/outro, and music
- transcript coverage: Audited the transcript’s coverage of the main experimental design, data-quality checks, major results, tissue-level interpretation, and preservation rationale described in the article. Assessed sections: sample collection/preservation; RNA sequencing and fragment mapping; damage signatures and data authenticity; exonic
- transcript topics: Sample collection and permafrost preservation; RNA sequencing, fragment length, and mapping strategy; Damage signatures and data authenticity (C>U deamination, 5' end bias); Exonic mapping and exon-exon junctions indicating mature mRNA; Tissue identity and metabolism (skeletal muscle, slow-twitch markers MYH7, TNNT1, NEB); Genetic sex determination (Y-chromosome transcripts USP9Y)

QC Summary:
- factual score: 10/10
- metadata score: 10/10
- supported core claims: 7
- claims flagged for review: 1
- metadata checks passed: 4
- metadata issues found: 0

Metadata Audited:
- article_doi
- article_title
- article_journal
- license

Factual Items Audited:
- RNA recovered from multiple mammoth samples; three showed endogenous mammoth material
- RNA fragments map predominantly to exonic regions and span exon-exon junctions (indicating mature mRNA)
- Tissue-specific transcriptional profile consistent with skeletal muscle and slow-twitch fiber markers
- Sex of the mammoth Yuka identified as male via Y-chromosome transcripts (USP9Y) and autosomal DNA analysis
- New regulatory microRNAs predicted (MPR novel 4 and 5) specific to Afrotherians
- Specific microRNA variant Mir-1 with lineage-specific signatures (Proboscideans)

QC Flagged Items (audited and not fully supported):
- Core claim uncertain: RNA preservation is limited to soft tissues; extension to bone is challenging

QC result: Warning. Items above were flagged during automated QC; the editorial team reviewed them before release.