CHANGES OF INTESTINAL MICROBIOTA IN PATIENTS WITH ULCERATIVE COLITIS

The aim of the study was to evaluate the representation of the microbial community in patients with ulcerative colitis. Materials and methods. The study included 46 patients with ulcerative colitis (25 men and 21 women, aged 42,4±13.8 years, duration of the disease - 5,42 ±8.21 years). Results of sequencing of ulcerative colitis patients stool samples as well as samples from 96 healthy volunteers were used for analysis. Whole genome sequencing was carried out on the SOLiD 5500W platform (LifeTechnologies, FosterCity, CA, USA). Results. Metagenomic analysis allowed us to detect 29 classes of bacteria, including: 73 families, 154 genera, 437 species of microbes in intestinal microbiota of patients with ulcerative colitis. The prokaryotic part of microbiota formed 99.5 % (98,2 % - Bacteria, 1,8 % - Archaea), viruses - 0.5 %, eukaryotes - 0,004 % of all intestinal microbiota. Taxonomic analysis revealed changes in the relative representation of bacterial families: we observed decrease in Lachnospiraceae, Rikenellaceae, Acidaminococcaceae, Enterococcaceae, Desulfovibrionaceae, Verrucomicrobiaceae, Clostridiaceae and increase in Enterobacteriaceae. Only the number of Escherichia genus, particularly Escherichia coli species was significantly abundant among the members of Enterobacteriaceae family. In ulcerative colitis patients the fraction of Escherichia was (3,74±8,01)% which was greater than in the control group (1,49±of 5.23)%, whereas the fraction of Clostridium (1,15±3,35)% was significantly lower in patients with ulcerative colitis than in the control group (2,33±4,26)%. The alpha-diversity index which characterizes richness of the microbial community was decreased in stool samples of patients with ulcerative colitis in comparison with the control group. Conclusions. The metagenomics analysis revealed significant changes in intestinal microbiota in ulcerative colitis patients comparing with the control group.

intestinal microbiota, ulcerative colitis, inflammatory bowel diseases, metagenome

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