Gut microbiome of Moroccan colorectal cancer patients

Study information

Reviewed Marked as Reviewed by Claregrieve1 on 2022/12/31

study design

case-control

Citation

PMID PubMed identifier for scientific articles.

29687353

DOI Digital object identifier for electronic documents.

10.1007/s00430-018-0542-5

URI

Authors

Allali I, Boukhatem N, Bouguenouch L, Hardi H, Boudouaya HA, Cadenas MB, Ouldim K, Amzazi S, Azcarate-Peril MA, Ghazal H

Journal

Medical microbiology and immunology

Year

2018

Keywords:

16S rRNA sequencing, Bacterial community, Colorectal cancer, Gut microbiome composition, Moroccan population

Although colorectal cancer is the third leading cause of death in Morocco, there are no studies of the microbiome changes associated with the disease in the Moroccan population. The aim of our study was to compare the stool microbiome of Moroccan cancer patients with healthy individuals. We analyzed the microbiome composition of samples from 11 CRC patients and 12 healthy individuals by 16S rRNA amplicon sequencing. Principal coordinate analysis of samples revealed defined cancer versus healthy clusters. Our findings showed that cancer samples had higher proportions of Firmicutes (T = 50.5%; N = 28.4%; p = 0.04), specifically of Clostridia (T = 48.3%; N = 19.0%; p = 0.002), and Fusobacteria (T = 0.1%; N = 0.0%; p = 0.02), especially of Fusobacteriia (T = 0.1%; N = 0.0%; p = 0.02), while Bacteroidetes were enriched in healthy samples (T = 35.1%; N = 62.8%; p = 0.06), particularly the class Bacteroidia (T = 35.1%; N = 62.6%; p = 0.06). Porphyromonas, Clostridium, Ruminococcus, Selenomonas, and Fusobacterium were significantly overrepresented in diseased patients, similarly to other studies. Predicted functional information showed that bacterial motility proteins, flagellar assembly, and fatty acid biosynthesis metabolism were significantly overrepresented in cancer patients, while amino acid metabolism and glycan biosynthesis were overrepresented in controls. This suggests that involvement of these functional metagenomes is similar and relevant in the carcinogenesis process, independent of the origin of the samples. Results from this study allowed identification of bacterial taxa relevant to the Moroccan population and encourages larger studies to facilitate population-directed therapeutic approaches.

Experiment 1

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Reviewed Marked as Reviewed by Claregrieve1 on 2022/12/31

Curated date: 2021/01/10

Curator: WikiWorks

Revision editor(s): Claregrieve1, WikiWorks

Subjects

Location of subjects: Morocco

Host species Species from which microbiome was sampled. Contact us to have more species added.: Homo sapiens

Body site Anatomical site where microbial samples were extracted from according to the Uber Anatomy Ontology: Feces Cow dung,Cow pat,Droppings,Dung,Excrement,Excreta,Faeces,Fecal material,Fecal matter,Fewmet,Frass,Guano,Matières fécales@fr,Merde@fr,Ordure,Partie de la merde@fr,Piece of shit,Porción de mierda@es,Portion of dung,Portion of excrement,Portion of faeces,Portion of fecal material,Portion of fecal matter,Portion of feces,Portion of guano,Portion of scat,Portionem cacas,Scat,Spoor,Spraint,Stool,Teil der fäkalien@de,Feces,feces

Condition The experimental condition / phenotype studied according to the Experimental Factor Ontology: Colorectal carcinoma

Group 0 name Corresponds to the control (unexposed) group for case-control studies: healthy control

Group 1 name Corresponds to the case (exposed) group for case-control studies: colorectal cancer

Group 1 definition Diagnostic criteria applied to define the specific condition / phenotype represented in the case (exposed) group: untreated colorectal cancer patients

Group 0 sample size Number of subjects in the control (unexposed) group: 12

Group 1 sample size Number of subjects in the case (exposed) group: 11

Antibiotics exclusion Number of days without antibiotics usage (if applicable) and other antibiotics-related criteria used to exclude participants (if any): 3 months

Lab analysis

Sequencing type: 16S

16S variable region One or more hypervariable region(s) of the bacterial 16S gene: V1-V2

Sequencing platform Manufacturer and experimental platform used for quantifying microbial abundance: Illumina

Statistical Analysis

Statistical test: Kruskall-Wallis

Significance threshold p-value or FDR threshold used for differential abundance testing (if any): 0.05

MHT correction Have statistical tests be corrected for multiple hypothesis testing (MHT)?: Yes

Matched on Factors on which subjects have been matched on in a case-control study: age, diet, region

Confounders controlled for Confounding factors that have been accounted for by stratification or model adjustment: body mass index, family history of cancer, sex

Alpha Diversity

Richness Number of species: unchanged

Signature 1

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Curated date: 2021/01/10

Curator: Lora Kasselman

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Source: Table 2 and text

Description: Differential microbial taxa between controls and CRC patients

Abundance in Group 1: increased abundance in colorectal cancer

NCBI	Quality Control	Links
Akkermansia
Bilophila
Butyricimonas
Christensenella
Christensenellaceae
Clostridiaceae
Clostridium
Dehalobacterium
Desulfovibrionaceae
Fusobacterium
Lachnospiraceae
Odoribacter
Oscillospira
Oscillospiraceae
Oxalobacter
Parabacteroides
Peptostreptococcus
Porphyromonas
Ruminococcus
Selenomonas
Lachnospiraceae incertae sedis
Erysipelotrichaceae
Eubacterium