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2018 ; 6
(1
): 70
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Multi-cohort analysis of colorectal cancer metagenome identified altered bacteria
across populations and universal bacterial markers
#MMPMID29642940
Dai Z
; Coker OO
; Nakatsu G
; Wu WKK
; Zhao L
; Chen Z
; Chan FKL
; Kristiansen K
; Sung JJY
; Wong SH
; Yu J
Microbiome
2018[Apr]; 6
(1
): 70
PMID29642940
show ga
BACKGROUND: Alterations of gut microbiota are associated with colorectal cancer
(CRC) in different populations and several bacterial species were found to
contribute to the tumorigenesis. The potential use of gut microbes as markers for
early diagnosis has also been reported. However, cohort specific noises may
distort the structure of microbial dysbiosis in CRC and lead to inconsistent
results among studies. In this regard, our study targeted at exploring changes in
gut microbiota that are universal across populations at species level. RESULTS:
Based on the combined analysis of 526 metagenomic samples from Chinese, Austrian,
American, and German and French cohorts, seven CRC-enriched bacteria (Bacteroides
fragilis, Fusobacterium nucleatum, Porphyromonas asaccharolytica, Parvimonas
micra, Prevotella intermedia, Alistipes finegoldii, and Thermanaerovibrio
acidaminovorans) have been identified across populations. The seven enriched
bacterial markers classified cases from controls with an area under the
receiver-operating characteristics curve (AUC) of 0.80 across the different
populations. Abundance correlation analysis demonstrated that CRC-enriched and
CRC-depleted bacteria respectively formed their own mutualistic networks, in
which the latter was disjointed in CRC. The CRC-enriched bacteria have been found
to be correlated with lipopolysaccharide and energy biosynthetic pathways.
CONCLUSIONS: Our study identified potential diagnostic bacterial markers that are
robust across populations, indicating their potential universal use for
non-invasive CRC diagnosis. We also elucidated the ecological networks and
functional capacities of CRC-associated microbiota.