Metagenomic Characterization of the Intestinal Microbiota in ALS Patients and Association With Clinical Phenotypes

"The ALS-Gut study aims to quantitatively and qualitatively characterize the microbiota in a cohort of 300 French ALS patients, and to correlate these results with the clinical features of the disease. The ALS-Gut study will build on the "Le French Gut" project conducted by a consortium comprising INRAE, AP-HP, INSERM and Institut Pasteur on 100,000 volunteers, aimed at characterizing the heterogeneity and diversity of the gut microbiota of subjects living in France (https://lefrenchgut.fr). The "French Gut" is a non-interventional study (protocol appended) involving human subjects. It is prospective, nationwide, with the creation of a biological collection (faeces) linked to the exploitation of data from questionnaires and the ""Système National des Données de Santé"" (SNDS). Following volunteer registration via the study's dedicated website, a stool sample will be taken at home for analysis of the fecal microbiota by shotgun metagenomic sequencing. The various components of the microbiota will then be compared with individual data obtained from specific questionnaires, completed on the French Gut website by the volunteer, such as dietary habits or current state of health. The ""French Gut"" project will map the healthy gut microbiota in France, and also describe variations in gut microbiota associated with the presence and development of certain diseases, particularly neurodegenerative diseases such as ALS. The ALS-Gut study is a non-human research study, which will use clinical data collected prospectively in 18 French ALS expert centers as part of the routine management of 300 French ALS patients participating in the "Le French Gut" project. The clinical data collected as part of the ALS-Gut study will be analyzed in conjunction with the metagenomic results obtained by INRAE, based on a stool sample sent to the French Gut consortium by the patient in advance, on a voluntary basis."