Enrichment of Oral-derived Bacteria in Inflamed Colorectal Tumors and Distinct Associations of Fusobacterium in the Mesenchymal Subtype

Overview

Journal Cell Rep Med

Publisher Cell Press

Specialties Biology
General Medicine

Date 2023 Jan 27

PMID 36706753

Authors

Brett S Younginger

Oleg Mayba

Jens Reeder

Deepti R Nagarkar

Zora Modrusan

Matthew L Albert

Allyson L Byrd

Affiliations

Soon will be listed here.

Abstract

While the association between colorectal cancer (CRC) features and Fusobacterium has been extensively studied, less is known of other intratumoral bacteria. Here, we leverage whole transcriptomes from 807 CRC samples to dually characterize tumor gene expression and 74 intratumoral bacteria. Seventeen of these species, including 4 Fusobacterium spp., are classified as orally derived and are enriched among right-sided, microsatellite instability-high (MSI-H), and BRAF-mutant tumors. Across consensus molecular subtypes (CMSs), integration of Fusobacterium animalis (Fa) presence and tumor expression reveals that Fa has the most significant associations in mesenchymal CMS4 tumors despite a lower prevalence than in immune CMS1. Within CMS4, the prevalence of Fa is uniquely associated with collagen- and immune-related pathways. Additional Fa pangenome analysis reveals that stress response genes and the adhesion FadA are commonly expressed intratumorally. Overall, this study identifies oral-derived bacteria as enriched in inflamed tumors, and the associations of bacteria and tumor expression are context and species specific.

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