Study: NCT04272307

Intervention type: BIOLOGICAL
Intervention: Blood samples
Description: At inclusion, at day 5, day 42 and at 3 months, one 2 ml EDTA blood tube will be collected for metabolomics.~Polar metabolites, lipids, free fatty acids and bile acids will be identified and quantitated using ultra high-performance liquid chromatography/tandem accurate mass spectrometry method.~At inclusion, one 2 ml EDTA tube will be stored as a DNA collection.

Intervention type: BIOLOGICAL
Intervention: Blood samples
Description: At inclusion, at day 5, day 42 and at 3 months, one 2 ml EDTA blood tube will be collected for metabolomics.~Polar metabolites, lipids, free fatty acids and bile acids will be identified and quantitated using ultra high-performance liquid chromatography/tandem accurate mass spectrometry method.~At inclusion, one 2 ml EDTA tube will be stored as a DNA collection.

Intervention type: PROCEDURE
Intervention: Stool samples
Description: One stool sample will be taken at baseline, day 5, day 42 and at 3 months and frozen at -80°C and divided in 2 aliquots.~One stool aliquot will be used for metabolomics. Polar metabolites, lipids, free fatty acids and bile acids will be identified and quantitated using ultra high-performance liquid chromatography/tandem accurate mass spectrometry method. The other one will be used for microbiota analysis. Samples will be sent to the McGill University (Prof. SALEH's lab) for extraction and then, Génome Québec Innovation Centre (McGill University, Montréal, Canada) for sequencing of the V4 region of the 16S rRNA gene on Illumina MiSeq in paired-end mode.

Intervention type: PROCEDURE
Intervention: Stool samples
Description: One stool sample will be taken at baseline, day 5, day 42 and at 3 months and frozen at -80°C and divided in 2 aliquots.~One stool aliquot will be used for metabolomics. Polar metabolites, lipids, free fatty acids and bile acids will be identified and quantitated using ultra high-performance liquid chromatography/tandem accurate mass spectrometry method. The other one will be used for microbiota analysis. Samples will be sent to the McGill University (Prof. SALEH's lab) for extraction and then, Génome Québec Innovation Centre (McGill University, Montréal, Canada) for sequencing of the V4 region of the 16S rRNA gene on Illumina MiSeq in paired-end mode.

Intervention type: PROCEDURE
Intervention: Colorectal biopsies
Description: During routine flexible sigmoidoscopy, 6 biopsies will be collected with a 5 mm biopsy forceps at baseline and at 3 months. Biopsies will be placed into a sterile vial containing RNAlater (Qiagen, Hilden, Germany) and stored at -80°C. Two biopsies will be used for mucosal microbiome analysis in the same way as the stool sample. Four biopsies will be used for RNAseq. Samples will be shipped to Prof. SALEH's lab in Montréal for nucleic acid extraction. The McGill University and Génome Québec Innovation Centre (McGill University, Montréal, Canada) will provide library preparation and next generation sequencing. The average number of uniquely mapped reads per sequencing run will be 30 million reads per sample.

Intervention type: PROCEDURE
Intervention: Colorectal biopsies
Description: During routine flexible sigmoidoscopy, 6 biopsies will be collected with a 5 mm biopsy forceps at baseline and at 3 months. Biopsies will be placed into a sterile vial containing RNAlater (Qiagen, Hilden, Germany) and stored at -80°C. Two biopsies will be used for mucosal microbiome analysis in the same way as the stool sample. Four biopsies will be used for RNAseq. Samples will be shipped to Prof. SALEH's lab in Montréal for nucleic acid extraction. The McGill University and Génome Québec Innovation Centre (McGill University, Montréal, Canada) will provide library preparation and next generation sequencing. The average number of uniquely mapped reads per sequencing run will be 30 million reads per sample.