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Interaction Between Host MicroRNAs and the Gut Microbiota in Colorectal Cancer

Ce Yuan, Michael Burns, Subbaya Subramanian, Ran Blekhman
doi: https://doi.org/10.1101/192401
Ce Yuan
University of Minnesota;
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Michael Burns
Loyola University
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Subbaya Subramanian
University of Minnesota;
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Ran Blekhman
University of Minnesota;
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  • For correspondence: blekhman@umn.edu
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Abstract

Background: Although variation in gut microbiome composition has been linked with colorectal cancer (CRC), the factors that mediate the interactions between CRC tumors and the microbiome are poorly understood. MicroRNAs (miRNAs) are known to regulate CRC progression and patient survival outcomes. In addition, recent studies suggested that host miRNAs can also regulate bacterial growth and influence the composition of the gut microbiome. Here, we investigated the association between miRNAs expression in human CRC tumor and normal tissues and the microbiome composition associated with these same tissues. Methods: We sequenced the small RNAs from patient-matched tumor and normal tissue samples collected from 44 human CRC patients performed an integrated analysis with microbiome taxonomic composition data from these same samples. We then interrogated the functions of the bacteria correlated with miRNAs that were differentially expressed (DE) between tumor and matched normal tissues, as well as the functions of miRNAs correlated with bacterial taxa that have been previously associated with CRC, including Fusobacterium, Providencia, Bacteroides, Akkermansia, Roseburia, Porphyromonas, and Peptostreptococcus. Results: We identified 76 miRNAs as DE between CRC and normal tissue, including known oncogenic miRNAs miR-182, miR-503, and miR-17~92. These DE miRNAs were correlated with the relative abundance of several bacterial taxa, including Firmicutes, Bacteroidetes, and Proteobacteria. Bacteria correlated with DE miRNAs were enriched with distinct predicted metabolic categories. Additionally, we found that miRNAs correlated with CRC-associated bacteria are predicted to regulate targets that are relevant for host-microbiome interactions, and highlight a possible role for miRNA-driven glycan production in the recruitment of pathogenic microbial taxa. Conclusions: Our work characterized a global relationship between microbial community composition and miRNA expression in human CRC tissues. Our results support a role for miRNAs in mediating a bi-directional host-microbiome interaction in CRC. In addition, we highlight sets of potentially interacting microbes and host miRNAs, suggesting several pathways that can be targeted via future therapies.

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The copyright holder for this preprint is the author/funder. It is made available under a CC-BY 4.0 International license.
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  • Posted September 22, 2017.

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Interaction Between Host MicroRNAs and the Gut Microbiota in Colorectal Cancer
Ce Yuan, Michael Burns, Subbaya Subramanian, Ran Blekhman
bioRxiv 192401; doi: https://doi.org/10.1101/192401
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Interaction Between Host MicroRNAs and the Gut Microbiota in Colorectal Cancer
Ce Yuan, Michael Burns, Subbaya Subramanian, Ran Blekhman
bioRxiv 192401; doi: https://doi.org/10.1101/192401

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