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Tables S1,2,3 from Aggressive PDACs Show Hypomethylation of Repetitive Elements and the Execution of an Intrinsic IFN Program Linked to a Ductal Cell of Origin

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posted on 2023-04-03, 22:42 authored by Elisa Espinet, Zuguang Gu, Charles D. Imbusch, Nathalia A. Giese, Magdalena Büscher, Mariam Safavi, Silke Weisenburger, Corinna Klein, Vanessa Vogel, Mattia Falcone, Jacob Insua-Rodríguez, Manuel Reitberger, Vera Thiel, Steffi O. Kossi, Alexander Muckenhuber, Karnjit Sarai, Alex Y.L. Lee, Elyne Backx, Soheila Zarei, Matthias M. Gaida, Manuel Rodríguez-Paredes, Elisa Donato, Hsi-Yu Yen, Roland Eils, Matthias Schlesner, Nicole Pfarr, Thilo Hackert, Christoph Plass, Benedikt Brors, Katja Steiger, Dieter Weichenhan, H. Efsun Arda, Ilse Rooman, Janel L. Kopp, Oliver Strobel, Wilko Weichert, Martin R. Sprick, Andreas Trumpp

Patient characteristics and sequencing QC results

Funding

help deriving the acinar and ductal human samples

BMBF

PANC-STRAT consortium

DKFZ-NCT

Deutsche Forschungsgemeinschaft

German Research Foundation

EMBO

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ARTICLE ABSTRACT

Pancreatic ductal adenocarcinoma (PDAC) is characterized by extensive desmoplasia, which challenges the molecular analyses of bulk tumor samples. Here we FACS-purified epithelial cells from human PDAC and normal pancreas and derived their genome-wide transcriptome and DNA methylome landscapes. Clustering based on DNA methylation revealed two distinct PDAC groups displaying different methylation patterns at regions encoding repeat elements. Methylationlow tumors are characterized by higher expression of endogenous retroviral transcripts and double-stranded RNA sensors, which lead to a cell-intrinsic activation of an interferon signature (IFNsign). This results in a protumorigenic microenvironment and poor patient outcome. Methylationlow/IFNsignhigh and Methylationhigh/IFNsignlow PDAC cells preserve lineage traits, respective of normal ductal or acinar pancreatic cells. Moreover, ductal-derived KrasG12D/Trp53−/− mouse PDACs show higher expression of IFNsign compared with acinar-derived counterparts. Collectively, our data point to two different origins and etiologies of human PDACs, with the aggressive Methylationlow/IFNsignhigh subtype potentially targetable by agents blocking intrinsic IFN signaling. The mutational landscapes of PDAC alone cannot explain the observed interpatient heterogeneity. We identified two PDAC subtypes characterized by differential DNA methylation, preserving traits from normal ductal/acinar cells associated with IFN signaling. Our work suggests that epigenetic traits and the cell of origin contribute to PDAC heterogeneity.This article is highlighted in the In This Issue feature, p. 521

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Keywords

Gastrointestinal Cancers Pancreatic cancer Tumor Heterogeneity Tumor Microenvironment

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CC BY

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