210: Tumour-Reactive CD8 T Cell Clusters in Human Melanoma

Tumour-Reactive CD8 T Cell Clusters in Human Melanoma Music:Enjoy the music based on this article at the end of the episode. DOI:10.1038/s41586-025-09754-w 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/tumour-reactive-cd8-t-cell-clusters-in-human-melanoma ️ Episode:210: Tumour-Reactive CD8 T Cell Clusters in Human Melanoma ️ Season:1 Article title:Tumour-reactive heterotypic CD8 T cell clusters from clinical samples Journal:Nature QC:This episode was checked against the original article PDF and publication metadata for the episode release published on 2025-11-26. QC Scope:- article metadata and core scientific claims from the narration- excludes analogies, intro/outro, and music- transcript coverage: Audited the transcript sections describing cluster discovery in clinical samples, synapse evidence, antigen-specific competition, ex vivo cytotoxicity and cytokine production, in vivo ACT/PDX results, and the role of TCF7+ stem-like exhausted T cells.- transcript topics: Immunological synapse and proximity requirements for anti-tumor activity; Preservation of cellular clusters during tissue digestion and processing; Antigen-specific T cell competitiveness and cluster formation; Heterotypic CD8+ T cell clusters in clinical melanoma samples (21 patients); Single-cell RNA and TCR analyses of cluster T cells; Ex vivo cytotoxicity and cytokine production by cluster-derived T cells 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:- 21 human melanoma metastases analyzed; heterotypic CD8+ T cell clusters with tumor cells and/or APCs observed in all samples- Clusters enriched for tumour reactivity and exhaustion signatures with increased TCR clonality- Antigen-specific MART-1 T cells outcompete non-specific T cells for cluster formation; up to 11-fold enrichment at 1% input- Ex vivo killing by cluster-derived T cells is ~9-fold higher than singlets; increased IFN-γ and TNF production- In vivo ACT/PDX models show tumor control and increased T cell infiltration/activation with cluster-derived T cells- Clustered CD8+ T cells show a TCF7+ stem-like exhausted state, suggesting persistence and durability QC result: Pass. Chapters (00:00:00) - The Paradox of the Immune System(00:02:31) - Immunity clusters in melanoma(00:08:13) - Immunity 4, Cluster-derived T cells(00:11:45) - Cluster Analysis for T-cell protection(00:14:52) - Crowded Storms