200: Sperm Sequencing Reveals Extensive Positive Selection in the Male Germline

Music:Enjoy the music based on this article at the end of the episode. DOI:10.1038/s41586-025-09448-3 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/ Support:Base by Base – Stripe donations: https://donate.stripe.com/7sY4gz71B2sN3RWac5gEg00 Official website https://basebybase.com On PaperCast Base by Base you’ll discover the latest in genomics, functional genomics, structural genomics, and proteomics. ️ Episode:200: 200: Sperm Sequencing Reveals Extensive Positive Selection in the Male Germline ️ Season:1 Article title:Sperm sequencing reveals extensive positive selection in the male germline Journal:Nature QC:This episode was checked against the original article PDF and publication metadata for the episode release published on 2025-11-16. QC Scope:- article metadata and core scientific claims from the narration- excludes analogies, intro/outro, and music- transcript coverage: Audited transcript sections describing (i) mutation rates in sperm vs blood, (ii) NanoSeq/duplex sequencing methodology and error correction, (iii) positive selection in the male germline including gene count and LOF/activating mechanisms, (iv) RAS–MAPK pathway involvement, (v) disease risk implications and paternal ag- transcript topics: Sperm mutation rates and somatic comparison; NanoSeq/duplex sequencing methodology and error correction; Positive selection in the male germline: gene count and mutation mechanisms; Loss-of-function vs activating mutations and RAS–MAPK pathway; Disease risk implications and paternal age effects; Study limitations and boundaries of NanoSeq (variant types detected) 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:- Baseline sperm mutation rate: 1.67 substitutions per year per haploid genome- Sperm accumulate mutations ~8x slower than in blood- Number of genes under significant positive selection: 40 (31 newly identified)- Loss-of-function mutations are common among positively selected genes; many in the RAS–MAPK pathway- Positive selection drives 2–3x increased risk of disease-causing mutations- 3–5% of sperm from middle-aged to older individuals carry a pathogenic mutation across the exome QC result: Pass.