422: Germline rDNA Variants and Human Complex Traits

Rodriguez-Algarra F et al., Cell Genomics - This episode examines a large-scale analysis of germline ribosomal DNA (rDNA) variation in ~500,000 UK Biobank genomes that identifies high-confidence rDNA SNVs and indels associating with human complex traits, notably a cluster in the 28S expansion segment ES15L linked to body-size measures. Key terms: ribosomal DNA, rRNA variants, UK Biobank, ES15L expansion segment, complex traits.

Study Highlights:
The authors derived a stringent set of 378 rDNA variants from UK Biobank whole-genome sequencing and tested intragenomic variant frequencies (IGFs) for association with 419 traits. They report 34 associations at global FDR < 0.01 concentrated in the 28S, with a cluster in ES15L associating with height, weight, and related measures. ES15L variant combinations are predicted to alter rRNA secondary structure and are expressed and incorporated into actively translating ribosomes. rDNA copy number and sequence variation influence overlapping traits but act independently.

Conclusion:
Germline sequence variation within human rDNA is a reproducible and trait-relevant source of genetic variation, with species-specific ES15L variants likely altering rRNA structure and ribosome composition and contributing to variation in body-size and other complex traits.

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

Article title:
Germline sequence variation within the ribosomal DNA is associated with human complex traits

First author:
Rodriguez-Algarra F

Journal:
Cell Genomics

DOI:
10.1016/j.xgen.2026.101213

Reference:
Rodriguez-Algarra F., Whittaker E., Cooper M., et al. Germline sequence variation within the ribosomal DNA is associated with human complex traits. Cell Genomics. 2026;6:101213. https://doi.org/10.1016/j.xgen.2026.101213

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/germline-rdna-variants-human-traits-ep422

QC:
This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-07-22.

QC Scope:
- article metadata and core scientific claims from the narration
- excludes analogies, intro/outro, and music
- transcript coverage: Audited the transcript for core scientific claims about ES15L rDNA variants: their clustering and trait associations, mechanistic interpretation (RNA structure, translation), evolutionary specificity, and independence from copy number, as presented in the article.
- transcript topics: ES15L expansion segment 15L variants in the 28S subunit; Association of ES15L variants with body-size traits (height, weight, birth weight, waist circumference); Evolutionary and primate comparison of ES15L haplotypes; Polysome-seq evidence for ES15L variant expression and incorporation into translating ribosomes; RNA secondary structure modeling of ES15L variants; Independence of ES15L variant effects from total rDNA copy number

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:
-...

Chapters

• (00:00:20) - How the genetic variation of the human genome is surprising
• (00:06:00) - The Hidden DNA fingerprint of humans
• (00:11:56) - How can ES15L variants affect human genetics?