Longitudinal Characterization of Microbial Signature in Systemic Sclerosis Patients

Systemic Sclerosis

Today, the study of gut microbiota has taken a prominent place in several fields of medical research. Numerous experimental data in humans and animals suggest that an imbalance in the composition of the microbiota could contribute to the pathophysiology of systemic autoimmune diseases such as Systemic Sclerosis (SCS). A future exploration of the microbiota, a source of diagnostic and/or prognostic biomarkers, may be very useful for tomorrow's medicine by proposing therapeutic interventions based on the correction of possible imbalances in the intestinal flora. Studies of the human gut microbiota in patients with ScS are limited to low-impact investigations, due to the lack of data on the clinical and biological characterization of the patients studied, and to the absence of longitudinal studies in the same patient. For this reason, we are interested in exploring the intestinal microbiota of ScS patients in a comprehensive and longitudinal way.

This is an explorative, prospective, monocentric open-label study qualified as interventional researches at minimal risks and constraints (called in French RIPH, category 2). This is a study of the gut microbiota and its characteristics in ScS patients, compared to control subjects (without ScS or other chronic diseases), matched on age and sex. Participants provided two stool samples: one collected the day of inclusion and a second, six months later. In parallel with the microbiota analysis, a clinical (digestive and extra digestive signs, severity) and biological characterization of the ScS will be carried out by the team of internists. This medical evaluation will be completed by an interview with a dietician to inform about the participant's eating habits, and any changes in the 7 days preceding the stool collection. Microbial profiles will be obtained from the sequencing data using the specialized tools DADA2 and Kraken. The search of characteristic signature of ScS will be performed by comparing ScS patients and healthy controls using a discriminant linear analysis (LDA) using the specialized tool LEfSe Main objective is to identify, through longitudinal follow-up, significant differences in the composition of the intestinal microbiota of ScS patients and healthy control subjects (matched on age and sex) in order to define a microbial signature specific to the ScS. Secondary objectives are to study the stability over time of the identified microbial signatures, and to determine a correlation between the composition of the microbiota obtained in the ScS patient and the severity of his symptoms (diffuse skin disease, pulmonary interstitial disease, digestive disease...)

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