Gut microbiome of Moroccan colorectal cancer patients

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Reviewed Marked as Reviewed by Claregrieve1 on 2022/12/31
study design
Citation
PMID PubMed identifier for scientific articles.
DOI Digital object identifier for electronic documents.
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


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 cancer cancer of colorectum,cancer of large bowel,cancer of large intestine,cancer of the large bowel,colon cancer,colorectal cancer,colorectum cancer,CRC,large intestine cancer,malignant colorectal neoplasm,malignant colorectal tumor,malignant colorectum neoplasm,malignant large bowel neoplasm,malignant large bowel tumor,malignant large intestine neoplasm,malignant large intestine tumor,malignant neoplasm of colorectum,malignant neoplasm of large bowel,malignant neoplasm of large intestine,malignant neoplasm of the large bowel,malignant neoplasm of the large intestine,malignant tumor of large bowel,malignant tumor of large intestine,malignant tumor of the large bowel,malignant tumor of the large intestine,Colorectal cancer
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

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

Curated date: 2021/01/10

Curator: Lora Kasselman

Revision editor(s): Claregrieve1, WikiWorks

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 ControlLinks
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

Revision editor(s): Claregrieve1, WikiWorks

Signature 2

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

Curated date: 2021/01/10

Curator: Lora Kasselman

Revision editor(s): Claregrieve1, WikiWorks

Source: Table 2 and text

Description: Differential microbial taxa between controls and CRC patients

Abundance in Group 1: decreased abundance in colorectal cancer

NCBI Quality ControlLinks
Megamonas
unclassified Bradyrhizobiaceae
Mitsuokella

Revision editor(s): Claregrieve1, WikiWorks