Dysbiosis in the Gut Microbiota of Adolescents with Obesity

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Novikova Evgenia Anatolyevna1, Bairova Tatyana Ananyevna2, Belkova Natalia Leonidovna3, Pogodina Anna Valeryevna4, Romanitsa Anastasia Igorevna5, Rychkova Lyubov Vladimirovna6
1Laboratory of Infectology and Immunoprophylaxis in Pediatrics Scientific РЎentre of Family Health and Human Reproduction Problems Irkutsk, Russia, europe411@mail.ru
2Laboratory of Personalized Medicine Scientific РЎentre of Family Health and Human Reproduction Problems Irkutsk, Russia, tbairova38@mail.ru
3Laboratory of Microbiome and Microecology Scientific РЎentre of Family Health and Human Reproduction Problems Irkutsk, Russia, nlbelkova@gmail.com
4Laboratory of Pediatrics and Cardiovascular Pathology Scientific РЎentre of Family Health and Human Reproduction Problems Irkutsk, Russia, pogodina_av@inbox.ru
5Laboratory of Pediatrics and Cardiovascular Pathology Scientific РЎentre of Family Health and Human Reproduction Problems Irkutsk, Russia, f1693@rambler.ru
6Director and Head of Pediatry Department Scientific РЎentre of Family Health and Human Reproduction Problems Irkutsk, Russia, rychkova.nc@gmail.com

Gut microbiota plays a fundamental role in the pathogenesis of metabolic disorders including obesity. Gut microbial dysbiosis induces immune and metabolic disturbances. We wanted to find out a gut microbiota composition at adolescents with obesity and normal weight. The examined group included 40 adolescents. There were 18 obese adolescents with SDS BMI=2.77В±0.55 (OB), and 22 adolescents with SDS BMI=0.01В±0.50 (CO). The metagenome sequencing of V3-V4 variable regions of 16S rDNA was done by Novogene Company (China). Data were analyzed using the StatSoft STATISTICA 6.0 software package. Statistical significance was accepted at the p<0.05 level. Microbial richness indices and biodiversity indices were similar in the groups with obesity and normal weight. No difference was found between two groups in the phyla Firmicutes, Bacteroidetes, Proteobacteria, Actinobacteria, and in the following genera Bacteroides, Alistipes, Subdoligranulum, Megasphaera, Blautia, Akkermansia, Odoribacter, Faecalibacterium, Lactobacillus, Bifidobacterium, and Streptococcus. As well as, P/A ratio along with B/F was comparable in both groups. Nevertheless, it should be noted that significant differences in the gut microbiota composition were found for phylotypes. The obese participants had a 2-fold decrease in Enterobacter (42 (13-61) in OB, 167 (42-371) in CO, p=0.02), and an increase – in the Anaerotruncus phylotype (326 (215-732) in OB, 226 (165-320) in CO, p=0.04). Summing up, results point to the dysbiosis of the gut microbiota in adolescences with obesity due to a prevalence of bacterial groups belonging to the phylotype Anaerotruncus (the phylum Firmicutes), whereas the Enterobacter phylotype (the phylum Proteobacteria) is underrepresented.

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Elena Koroleva
Elena Koroleva
1 year ago

Thank you for the presentation. Did you evaluate the influence of external factors on the intestinal microbiota such as nutrition features, the use of drugs, sorbents? Can the enterobacter decline you have detected matter?

Evgenia Novikova
Evgenia Novikova
1 year ago

Thank you, Elena, for the question. We evaluated influence of breastfeeding duration on the gut microbiota composition. Unfortunately, we didn’t investigate other extrinsic factors.