| Summary: | Background: Hidradenitis suppurativa (HS) is a systemic inflammatory disease that extends beyond the skin. The role of gut microbiome alterations in the pathogenesis of inflammatory and autoimmune disorders is remarkable.Objective: Based on the hypothesis that dysbiosis in the gut microbiome may be a trigger for systemic inflammation in the pathogenesis of HS, the aim of this study was to investigate whether the gut microbiome is altered in HS patients comparing with healthy subjects.Methods: In present case-control study, fecal samples from 15 patients with HS and 15 age- and sex-matched healthy individuals were collected and analyzed using 16S rRNA-based metagenomic analysis. The V3 and V4-hypervariable regions of 16S rDNA gene were amplified from all samples and sequenced by the Illumina MiSeq platform. Bioinformatic analyzes were performed in QIIME2. Results: Shannon alpha diversity index showed significantly reduced diversity in HS patients (P = 0.048). Bray-Curtis Dissimilarity and Jaccard Distance revealed that the gut microbial composition of HS patients was significantly distinctive from that of controls (P = 0.01 and P = 0.007, respectively). The relative abundance of unclassified Clostridiales, unclassified Firmicutes and Fusicatenibacter in HS was significantly lower than that in controls (P = 0.005, P = 0.029, and P = 0.046, respectively).Conclusion: This study indicated that significant alterations in gut microbiota of HS patients could play a critical role in the pathogenesis of HS and might be a trigger for systemic inflammation. Increased understanding the pathogenesis of HS will shed light on the new potential therapeutic targets and novel treatment options.
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