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 transcript sections covering cluster discovery, immunological synapse evidence, antigen-specific competition, ex vivo cytotoxicity and cytokine production, in vivo ACT/PDX results, and the TCF7+ stem-like exhausted T cell state. - transcript topics: Immunological synapse and proximity requirements; Preservation of cellular clusters during tissue processing; Antigen-specific T cell competitiveness and cluster formation; Clinical heterotypic CD8+ T cell clusters in melanoma (21 samples); Single-cell RNA/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 melanoma metastases analyzed; heterotypic CD8+ T cell clusters with tumor cells and/or APCs observed in all samples - Clusters show relocalization of immune synapse markers (HLA-ABC, CD58, ICAM1) to the T cell–tumor interface - MART-1-specific 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 associated with 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