Study

Mutational signature in colorectal cancer induced by genotoxic pks+ E. coli

Study ID Alternative Stable ID Type
EGAS00001003934 Other

Study Description

Various species of the intestinal microbiota have been associated with the development of colorectal cancer (CRC), yet a direct role of bacteria in the occurrence of oncogenic mutations has not been established. Escherichia coli can carry the pathogenicity island pks, which encodes a set of enzymes that synthesize colibactin. This compound alkylates DNA on adenine residues and induces double strand breaks in cultured cells. Here, we exposed human intestinal organoids to genotoxic pks+ Escherichia coli by repeated luminal injection over a period of 5 months. Whole genome sequencing (WGS) of clonal organoids before and after this exposure reveals a distinct mutational signature, absent from organoids injected with isogenic pks-mutant bacteria. The same mutational signature is detected in a subset of 3668 human metastatic cancer genomes, predominantly in a subset of CRC cases. Our study describes a distinct mutational signature in CRC and implies that the underlying mutational process directly results from past exposure to bacteria carrying the colibactin-producing pks pathogenicity ... (Show More)

Study Datasets 2 datasets.

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Dataset ID Description Technology Samples
EGAD00001005416
Organoid cultures were exposed to two different E.Coli strains and a dye control with three biological duplicates. Their original culture was harvested as a control. In total 10 organoid cultures were whole-genome sequenced using the Novaseq6000 platforms. The data is deposited as .bam format.
Illumina NovaSeq 6000 20
EGAD00001008687
The mutagenicity of bacteria was assessed by serially exposing human small intestinal organoids to various bacterial species or isolated toxins. We have used the following abbreviations: EWT: Organoids exposed to E. coli described in PMID: 32106218 EKO: Organoids exposed to isogenic E. coli as EWT, with knockout of the deltaClbQ gene, rendering them unable to produce colibactin DYE: Organoids exposed to FastGreen injection control dye NIS: Organoids exposed to E. coli Nissle ETBF: Organoids ... (Show More)
Illumina NovaSeq 6000 15

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