Base by Base

Gustavo Barra
  • 3.0 (2)
  • LIFE SCIENCES
  • UPDATED DAILY

Base by Base explores advances in genetics and genomics, with a focus on gene-disease associations, variant interpretation, protein structure, and insights from exome and genome sequencing. Each episode breaks down key studies and their clinical relevance—one base at a time. Powered by AI, Base by Base offers a new way to learn on the go. Special thanks to authors who publish under CC BY 4.0, making open-access science faster to share and easier to explore.

  1. 16H AGO

    363: cfDNA size deconvolution reveals a 159‑bp nucleosomal pivot and tumor fragmentomic signatures

    Zhou Z et al., Nature Communications - This study develops a Lorentzian deconvolution model of cfDNA fragment length distributions across bodily fluids, identifies a ~159 bp component that demarcates intra- vs inter-nucleosomal fragments, and shows that intra-nucleosomal fragmentation entropy distinguishes tumor-derived ctDNA from non-tumor shortening. Key terms: cell-free DNA, fragmentomics, nucleosome, ctDNA, size deconvolution. Study Highlights: The authors modeled cfDNA size profiles as sums of Cauchy–Lorentz distributions with ~10 bp periodicity and applied deconvolution across plasma, saliva, urine, CSF and lymphatic fluid. A distinct ~159 bp component emerged as a pivot between intra- and inter-nucleosomal fragments. Tumor-derived ctDNA shows increased intra-nucleosomal fragmentation entropy and inverse amplitude changes across the 159 bp boundary, whereas phagocytosis-associated shortening increases intra-nucleosomal amplitude without raising entropy. The intra/inter-nucleosomal entropy ratio improved cancer detection performance relative to standard size-ratio metrics across multiple cohorts. Conclusion: Size deconvolution using Lorentzian components reveals nucleosomal structure in cfDNA, identifies a 159 bp demarcation between fragmentation regimes, and provides an entropy-based metric that enhances ctDNA detection while separating tumor-associated fragmentation from phagocyte-related signals. Music: Enjoy the music based on this article at the end of the episode. Article title: Cell-free DNA size deconvolution resolves nucleosomal origins and reveals tumor-associated fragmentomic alterations First author: Zhou Z Journal: Nature Communications DOI: 10.1038/s41467-026-72925-4 Reference: Zhou Z, Cooper WN, Cheng Z, et al. Cell-free DNA size deconvolution resolves nucleosomal origins and reveals tumor-associated fragmentomic alterations. Nat Commun (2026). https://doi.org/10.1038/s41467-026-72925-4 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 link: https://basebybase.com/episodes/cfdna-size-deconvolution-nucleosomal-origins QC: This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-05-09. QC Scope: - article metadata and core scientific claims from the narration - excludes analogies, intro/outro, and music - transcript coverage: Substantive auditing of the transcript's discussion of cfDNA fragmentology, Lorentzian deconvolution, the 159 bp pivot, entropy vs amplitude distinctions, Li-Fraumeni context, phagocytosis vs tumor fragmentation, and diagnostic performance metrics. - transcript topics: cfDNA fragmentomics basics; Lorentzian size deconvolution and nucleosome structure; 159 bp boundary between intra- and inter-nucleosomal cfDNA; intra-/inter-nucleosomal amplitude and entropy ratios; ctDNA fragmentation entropy as cancer signature; phagocytosis vs tumor-derived fragmentation 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: - cfDNA size profiles deconvoluted into Lorentzian components across multiple fluids with ~10 bp periodicity - a ~159 bp component d...

    22 min

  2. 17H AGO

    362: D614G Reshapes Spike Allostery and Speeds RBD Opening

    Kearns FL et al., PNAS - Simulations and HDXMS reveal how the D614G substitution alters internal communication in SARS-CoV-2 spike, enabling faster receptor-binding-domain opening through newly engaged allosteric pathways. Key terms: D614G, SARS-CoV-2 spike, RBD opening, allostery, weighted ensemble simulations. Study Highlights: Weighted ensemble simulations of Ancestral, Delta, and Omicron BA.1 spikes show distinct RBD opening landscapes and identify two S1 linkers (N2R and a previously underappreciated antiparallel R2N) that connect the NTD to the RBD. In the Ancestral spike a D614–K854 salt bridge constrains the R2N and must break before RBD opening; D614G abolishes that constraint, increasing local flexibility and enabling communication through both linkers. Delta and Omicron BA.1, both carrying D614G, open faster and use balanced N2R/R2N signaling; Omicron also forms a K856–D568 salt bridge and can adopt a unique “peel” conformation. Hydrogen–deuterium exchange mass spectrometry on VLPs confirms altered dynamics around the 614-proximal region consistent with the simulations. Conclusion: Ablation of the D614–K854 salt bridge by D614G relieves local frustration, opens an additional allosteric lane via the R2N linker alongside N2R, and accelerates RBD opening—providing a mechanistic link between the D614G substitution and increased infectivity; Omicron BA.1 further tunes this network with compensatory interactions. Music: Enjoy the music based on this article at the end of the episode. Article title: D614G reshapes allosteric networks and opening mechanisms of SARS - CoV - 2 spikes First author: Kearns FL Journal: PNAS DOI: 10.1073/pnas.2504793123 Reference: Kearns FL, Bogetti AT, Calvó-Tusell C, et al. D614G reshapes allosteric networks and opening mechanisms of SARS-CoV-2 spikes. PNAS. 2026;123(19):e2504793123. doi:10.1073/pnas.2504793123 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 link: https://basebybase.com/episodes/d614g-reshapes-allosteric-networks QC: This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-05-09. QC Scope: - article metadata and core scientific claims from the narration - excludes analogies, intro/outro, and music - transcript coverage: Audited the spoken content for alignment with the PNAS article's core findings: D614G reshapes spike allostery, dual N2R/R2N pathways, D614-K854 salt-bridge dynamics, Delta/Omicron opening differences, Omicron peel state, and HDXMS corroboration; plus methodological details (WE/MA binning, glycans, and limitations). - transcript topics: D614G impact on RBD opening dynamics; Weighted Ensemble simulations (WE) and minimal adaptive binning (MAB); N2R and R2N flexible linkers as allosteric pathways; D614-K854 salt bridge role and congestion; Variant-specific opening pathways: Delta and Omicron; Omicron BA.1 peel state and K856-D568 salt bridge QC Summary: - factual score: 10/10 - metadata score: 10/10 - supported core claims: 6 - 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: - D614G abolishes the D614-K854 salt bridge, increasing local flexibility and accelerating RBD opening via dual N2R and R2N l...

    19 min

  3. 2D AGO

    361: Chiral Inversion Mutagenesis Reveals Structured Hotspots in LCDs

    Beckner RL et al., PNAS - This episode examines a PNAS study using Chiral Inversion Mutagenesis (ChIM) to scan low-complexity domains (LCDs) of Emerin and neurofilament light chain (NEFL). Targeted L-to-D amino acid inversions reveal position-dependent, chirality-sensitive hotspots that control LCD self-association. Key terms: chiral inversion, low-complexity domains, Emerin, neurofilament light chain, synthetic protein chemistry. Study Highlights: The authors applied synthetic protein chemistry to introduce site-specific L-to-D Cα inversions (ChIM) in LCDs of Emerin (EMD) and NEFL. ChIM scans identified discrete enantioselective hotspots—EMD residues ~191–203 and NEFL residues ~22–41—where D substitutions strongly reduce self-association measured by GST pulldown and turbidity assays. Minimal inversions, including single D substitutions, can abrogate EMD self-association, while an all-D mirror-image C-terminal fragment restored activity, implicating backbone geometry and secondary-structure involvement. These results show that polypeptide homochirality and transient structure underpin certain LCD–LCD interactions. Conclusion: Cα stereochemistry is a determinant of LCD self-association at specific sequence hotspots, and ChIM provides a positional-resolution chemical approach to identify backbone-constrained elements that mediate oligomerization of disordered domains. Music: Enjoy the music based on this article at the end of the episode. Article title: Chiral inversion mutagenesis identifies geometrically constrained residues within self - associating low - complexity domains First author: Beckner RL Journal: PNAS DOI: 10.1073/pnas.2535888123 Reference: Beckner RL, Kim L, Carter C, Walterscheid A, Liszczak G. Chiral inversion mutagenesis identifies geometrically constrained residues within self-associating low-complexity domains. Proc Natl Acad Sci U S A. 2026;123(19):e2535888123. doi:10.1073/pnas.2535888123 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 link: https://basebybase.com/episodes/chiral-inversion-lcd-hotspots-361 QC: This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-05-08. QC Scope: - article metadata and core scientific claims from the narration - excludes analogies, intro/outro, and music - transcript coverage: Audited the spoken sections describing: ChIM methodology; Emerin LCD hotspot mapping (188–201) with 3×Pro and 3×D scans; single-residue effects (1×D) and all-D mirror-image rescue; NEFL head domain hotspot (22–41) with 5×D scans; assay descriptions (GST pulldown, turbidity); cross-β/anti-selective interactions; drug-de - transcript topics: Chiral inversion mutagenesis (ChIM) methodology; Emerin (EMD) LCD self-association hotspot mapping (188–201) with Pro/ D-inversions; NEFL head domain hotspot mapping (22–41) with 5×D inversions; Mutational scan results: 3×D, 1×D, 5×D variants and effects on pulldown/turbidity; Mirror-image (all-D) fragment rescue for Emerin; Assays: GST pulldown and turbidity measurements 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 Audite...

    25 min

  4. 3D AGO

    360: An inverse correlation between structural linguistic and human genetic diversity

    Graff A et al., PNAS - A PNAS study linking global population-genetic data and structural linguistic features finds an inverse correlation: regions with lower genetic diversity show higher structural linguistic diversity, after controlling for geography, phylogeny, and environment. Key terms: linguistic diversity, population genetics, Wright's F, language contact, structural typology. Study Highlights: The authors merged global genomic samples (Wright’s F / homozygosity) with curated structural linguistic datasets and estimated local structural entropy per grid cell. Using Bayesian GAMMs that adjust for spatial, phylogenetic, environmental, and sampling confounds, they find that higher excess homozygosity (lower genetic diversity) predicts higher structural linguistic entropy. The genetic predictor outperforms other covariates and the effect is robust across grid resolutions and sensitivity checks, though it varies by region and by specific linguistic features. The pattern supports a model where isolation promotes linguistic diversification while contact and admixture promote homogenization. Conclusion: An inverse, regionally variable correlation between local human genetic diversity and structural linguistic diversity suggests isolation-driven hotspots are key windows into the flexibility and evolution of language structure. Music: Enjoy the music based on this article at the end of the episode. Article title: An inverse correlation between structural linguistic and human genetic diversity First author: Graff A Journal: PNAS DOI: 10.1073/pnas.2526762123 Reference: Graff A., Ringen E.J., Zakharko T., Stoneking M., Shimizu K.K., Bickel B., Barbieri C. An inverse correlation between structural linguistic and human genetic diversity. Proc. Natl. Acad. Sci. U.S.A. 2026;123(18):e2526762123. doi:10.1073/pnas.2526762123 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 link: https://basebybase.com/episodes/inverse-correlation-linguistic-genetic-diversity QC: This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-05-07. QC Scope: - article metadata and core scientific claims from the narration - excludes analogies, intro/outro, and music - transcript coverage: Audited sections describing inverse relationship between local genetic diversity and structural linguistic diversity, methods (F coefficient, entropy, geodesic hex grids), magnitude of effects, regional patterns, and study limitations; cross-checks with article content performed. - transcript topics: Inverse relationship between genetic diversity and linguistic structural diversity; Genetic metric Wright's F and linguistic entropy (normalized Shannon entropy); Geodesic hex grid methodology and grid resolutions (500 km and 300 km); Regional variation and strongest signals (North-Central Asia, Southeast Asia); Feature-level impact and percent of features affected by genetic diversity; Limitations: correlation vs causation and blind spots of genetic data QC Summary: - factual score: 10/10 - metadata score: 10/10 - supported core claims: 5 - 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: - Inverse correlation betwee...

    27 min

  5. 4D AGO

    359: Ultrapotent PDCoV Miniprotein MB11

    Avery NG et al., PNAS - This episode covers a PNAS study reporting the de novo design of miniprotein inhibitors targeting porcine deltacoronavirus (PDCoV). The lead minibinder, MB11, binds the PDCoV RBD with picomolar affinity, broadly neutralizes diverse deltacoronaviruses, and resists multiple biochemical stresses. Key terms: Porcine deltacoronavirus, miniprotein inhibitor, MB11, protein design, neutralization. Study Highlights: Researchers used computational design (BindCraft and AlphaFold3) to generate miniprotein inhibitors targeting the PDCoV receptor-binding domain and screened candidates by BLI and pseudovirus neutralization. MB11 binds the PDCoV RBD with KD ~155 pM and neutralizes PDCoV and several distantly related DCoVs with superior potency to known antibodies. Cryo-EM shows MB11 occludes receptor-binding loops and sterically blocks APN engagement, explaining broad neutralization. Deep mutational scanning indicates a high barrier to escape and biochemical tests show MB11 retains function after high temperature and low pH exposure but is susceptible to pepsin. Conclusion: MB11 is a promising preclinical PDCoV inhibitor combining ultrapotent, broad neutralization, mechanistic receptor blockade, and favorable stability, supporting further development for pandemic preparedness. Music: Enjoy the music based on this article at the end of the episode. Article title: Computational design of an ultrapotent deltacoronavirus miniprotein inhibitor First author: Avery NG Journal: PNAS DOI: 10.1073/pnas.2533456123 Reference: Avery NG, Yoshiyama CN, Taylor AL, Park Y-J, Asarnow D, Perruzza L, Brown JT, Corti D, Benigni F, Starr TN, Veesler D. Computational design of an ultrapotent deltacoronavirus miniprotein inhibitor. PNAS. 2026;123:e2533456123. doi:10.1073/pnas.2533456123 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 link: https://basebybase.com/episodes/mb11-pdcoronavirus-minibinder QC: This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-05-06. QC Scope: - article metadata and core scientific claims from the narration - excludes analogies, intro/outro, and music - transcript coverage: Audited the sections covering MB11 design (BindCraft/AF3), binding measurements (BLI), neutralization assays (PDCoV and related DCoVs), cryo-EM structural validation, deep mutational scanning escape analysis, biophysical stability tests (heat/acid/enzymes), and delivery/manufacturing implications discussed. - transcript topics: Computational minibinder design (BindCraft and AlphaFold3); Biolayer interferometry binding screening; Pseudovirus neutralization assays and breadth across DCoVs; Cryo-EM structure and mechanism of entry inhibition; Deep mutational scanning and viral escape barriers; Biophysical stability under heat, low pH, and proteases 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: - MB11 has KD ≈ 155 pM to PDCoV RBD (binds with high affinity). - MB11 neutralizes PDCoV pseudovirus with IC50 ≈ 216 pM. - MB11 shows broad neutralization across DCoVs, including SparrowC...

    23 min

  6. 5D AGO

    358: CHCHD4 and a Pediatric OXPHOS Collapse

    Mantecon M et al., Human Genetics and Genomics Advances - This episode reviews a brief communication reporting a pediatric patient with biallelic CHCHD4 variants who presented with severe neurological regression and early death. Functional studies in patient fibroblasts show decreased CHCHD4 protein, marked assembly defects of mitochondrial complexes I and IV, and broad downregulation of electron transport and complex I biogenesis. Lentiviral expression of wild-type CHCHD4 restored OXPHOS proteins and assembly, linking CHCHD4 deficiency to human mitochondrial disease. Key terms: CHCHD4, mitochondrial disease, OXPHOS, complex I, protein import. Study Highlights: A single infant carried a paternal c.5C>T (p.Ser2Phe) CHCHD4 variant and a maternal deletion encompassing CHCHD4, resulting in markedly reduced CHCHD4 protein and severe lactic acidosis with neurological regression. Fibroblast analyses revealed decreased complex I and IV subunits, assembly defects on BN-PAGE, and widespread downregulation of mitochondrial proteins by proteomics, with respiratory electron transport and complex I biogenesis identified as the main dysregulated pathways. Lentiviral overexpression of wild-type CHCHD4 in patient cells restored CHCHD4 levels, rescued complex I and IV protein abundance and assembly, and reversed many proteomic changes, supporting causality. Conclusion: Biallelic CHCHD4 deficiency causes a severe early-onset mitochondrial disease by impairing mitochondrial protein import and assembly of complexes I and IV; restoration of CHCHD4 rescues the molecular defects. Additional cases are needed to define the clinical spectrum and the functional impact of specific variants. Music: Enjoy the music based on this article at the end of the episode. Article title: Biallelic variants in CHCHD4 are associated with combined OXPHOS defect leading to mitochondrial disease First author: Mantecon M Journal: Human Genetics and Genomics Advances DOI: 10.1016/j.xhgg.2026.100615 Reference: Mantecon M, Chhuon C, Roger K, et al. Biallelic variants in CHCHD4 are associated with combined OXPHOS defect leading to mitochondrial disease. Human Genetics and Genomics Advances. 2026;7:100615. doi:10.1016/j.xhgg.2026.100615 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 link: https://basebybase.com/episodes/biallelic-chchd4-oxphos-defect QC: This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-05-05. QC Scope: - article metadata and core scientific claims from the narration - excludes analogies, intro/outro, and music - transcript coverage: Audited the sections describing CHCHD4 function in the MIA pathway, the pediatric case with biallelic CHCHD4 variants, AlphaFold structural predictions for Ser2Phe, lentiviral complementation rescuing OXPHOS defects, and the proteomics results including selective vulnerability and clinical implications. - transcript topics: MIA pathway and CHCHD4 function in mitochondrial protein import; Genetic case and inheritance pattern (p.Ser2Phe with maternal CHCHD4 deletion); AlphaFold structural prediction of Ser2Phe destabilizing CHCHD4; Functional complementation rescue with WT CHCHD4 in patient fibroblasts; Proteomics results showing OXPHOS defects and selective vulnerability; Clinical implications: CHCHD4 deficiency as a novel cause of mitochondrial disease QC... Chapters (00:00:20) - A cellular blackout: The nuclear power plant(00:02:22) - Mitochondrial dysfunction: The power grid of the cell(00:06:39) - Mitochondrial disease 8, Genetic Errors(00:12:29) - The CRISPR-based diagnosis of iron deficiency(00:18:27) - Bring the light back in mitochondrial disease

    26 min

  7. 6D AGO

    356: Recessive Coding Associations Across Six Biobanks

    Lassen F et al., The American Journal of Human Genetics - Meta-analysis of up to 948,690 exome- or whole-genome-sequenced individuals across six biobanks used statistical phasing to infer compound-heterozygous genotypes, increasing detectable bi-allelic damaging genotypes by 19% and identifying 58 significant gene-trait associations, 17 of which show stronger recessive effects. Key terms: recessive genetics, compound heterozygous, biobank meta-analysis, loss-of-function, statistical phasing. Study Highlights: The study combined data from UKB, All of Us, 100kGP, Genes & Health, BioMe, and BBJ totaling 948,690 samples and phased rare variants to detect compound-heterozygous genotypes. Phasing increased the number of bi-allelic damaging genotypes by 19% and identified 5,563 genes with bi-allelic pLoF genotypes. Gene-based recessive testing across 41 traits found 58 significant associations after meta-analysis and Cauchy combination, with 17 instances showing stronger recessive than additive effects, including HBB with heart failure and LECT2 with height. The federated, cross-biobank approach improved power and highlighted the value of diverse ancestries for discovering recessive effects. Conclusion: Federated meta-analysis across multiple biobanks combined with statistical phasing substantially increases discovery of rare recessive gene-trait associations and expands the catalog of human gene knockouts, demonstrating the importance of phasing and diverse cohorts for recessive-effect discovery. Music: Enjoy the music based on this article at the end of the episode. Article title: Meta-analysis across six global biobanks identifies recessive coding associations with complex traits and diseases First author: Lassen F Journal: The American Journal of Human Genetics DOI: 10.1016/j.ajhg.2026.04.005 Reference: Lassen F.H. et al., 2026. Meta-analysis across six global biobanks identifies recessive coding associations with complex traits and diseases. The American Journal of Human Genetics 113, 1–17. https://doi.org/10.1016/j.ajhg.2026.04.005 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 link: https://basebybase.com/episodes/recessive-coding-associations-six-biobanks QC: This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-05-03. QC Scope: - article metadata and core scientific claims from the narration - excludes analogies, intro/outro, and music - transcript coverage: Audited transcript sections describing: the role of statistical phasing to identify compound-heterozygous genotypes, the scale across six biobanks (~950k individuals), the rise in bi-allelic genotypes, and key recessive gene–trait associations (HBB, LECT2, ENSG00000267561, PYGM, ODAD1), plus pleiotropy and conditional - transcript topics: Introduction to human knockouts and biobank-scale data; Compound heterozygosity and the need for phasing; Statistical phasing across six biobanks and study scale; Gene-based recessive associations across 41 traits; Notable associations: HBB with heart failure and lipids; LECT2 with height; ENSG00000267561 with height; BTNL9 association with HDL-C and triglycerides 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... Chapters (00:00:11) - The Hidden World of Human Knockouts(00:06:52) - The genetic knockouts of the UK and Japan(00:09:47) - The Mendelian genetic mystery of heart disease(00:12:28) - The HBB Paradox(00:17:54) - The genetic determinants of healthcare(00:19:00) - What Happens to Medicine When we Sequence a Billion People?

    23 min

  8. 6D AGO

    355: Influenza D replicates in the human airway — zoonotic risk

    Sanders CG et al et al., PNAS - Surveillance-derived influenza D virus (IDV) isolates were tested across cell lines, primary airway cultures, and precision-cut lung slices to assess human compatibility. IDV replicated to high titers in human respiratory models while eliciting muted interferon responses, highlighting a potential zoonotic threat and the need for enhanced surveillance. Key terms: influenza D virus, zoonosis, human airway, interferon evasion, surveillance. Study Highlights: A panel of six genetically diverse IDV isolates replicated efficiently in MDCK and A549 cell lines, primary well-differentiated human bronchial epithelial cultures, porcine airway cultures, and precision-cut lung slices. IDV induced markedly reduced IRF activation and lower IFN-λ1 and ISG expression compared to human influenza A virus, indicating limited innate immune sensing. Pretreatment with IFN-β potently restricted IDV replication, showing the virus is sensitive to an established antiviral state. Active surveillance at US swine exhibitions recovered multiple genetically distinct IDV strains spanning several clades. Conclusion: IDV readily infects and replicates in human respiratory tissues while limiting innate sensing, supporting intensified surveillance and mechanistic studies to evaluate its zoonotic and pandemic potential. Music: Enjoy the music based on this article at the end of the episode. Article title: Efficient replication of influenza D virus in the human airway underscores zoonotic potential First author: Sanders CG et al Journal: PNAS DOI: 10.1073/pnas.2530325123 Reference: Sanders CG et al., Efficient replication of influenza D virus in the human airway underscores zoonotic potential. PNAS (2026) Vol. 123 No. 17 e2530325123. doi:10.1073/pnas.2530325123 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 link: https://basebybase.com/episodes/influenza-d-human-airway-zoonotic-potential QC: This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-05-03. QC Scope: - article metadata and core scientific claims from the narration - excludes analogies, intro/outro, and music - transcript coverage: Substantively audited the transcript sections describing field surveillance, in vitro and tissue-level replication in human/porcine models, innate immune responses, receptor usage, and zoonotic implications as reported in the canonical article. - transcript topics: Field surveillance and isolation of IDV from exhibition swine; IDV replication in MDCK cells and A549 cells; Primary human and porcine airway epithelial cultures (ALI); Precision-cut lung slices (PCLS) and tissue-level replication; Innate immune sensing and interferon responses (IRF, IFN-λ1, ISGs); Interferon-β pretreatment and antiviral state 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: - IDV replicates to high titers in MDCK cells and in immortalized human lung cells (A549). - IDV replicates efficiently in primary well-differentiated human airway epithelial cultures (ALI) and in porcine ALI cultures, with comparable rep... Chapters (00:00:11) - What Really Happens to Human Vibes?(00:02:04) - Disclosing the source of influenza D(00:06:08) - Human and pig lung viruses(00:12:16) - How influenza spreads like a stealthy virus(00:17:35) - Human Influenza: The Secret to Its Spread

    25 min
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Ratings & Reviews

3
out of 5
2 Ratings

About

Base by Base explores advances in genetics and genomics, with a focus on gene-disease associations, variant interpretation, protein structure, and insights from exome and genome sequencing. Each episode breaks down key studies and their clinical relevance—one base at a time. Powered by AI, Base by Base offers a new way to learn on the go. Special thanks to authors who publish under CC BY 4.0, making open-access science faster to share and easier to explore.

Information

  • Creator
    Gustavo Barra
  • Years Active
    2025 - 2026
  • Episodes
    365
  • Rating
    Clean
  • Copyright
    © Gustavo Barra
  • Show Website
    Base by Base

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