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Open Access 01-12-2015 | Research article

Comparison of the gut microbiota composition between obese and non-obese individuals in a Japanese population, as analyzed by terminal restriction fragment length polymorphism and next-generation sequencing

Authors: Chika Kasai, Kazushi Sugimoto, Isao Moritani, Junichiro Tanaka, Yumi Oya, Hidekazu Inoue, Masahiko Tameda, Katsuya Shiraki, Masaaki Ito, Yoshiyuki Takei, Kojiro Takase

Published in: BMC Gastroenterology | Issue 1/2015

Abstract

Background

Obesity has become one of the most serious social problems in developed countries, including Japan. The relationship between the gut microbiota and obesity has recently attracted the attention of many researchers. Although the gut microbiota was long thought to contribute to obesity, the exact association remains largely unknown. We examined the human gut microbiota composition in a Japanese population in order to determine its relationship to obesity.

Methods

Stool samples from 23 non-obese subjects (body mass index [BMI] <20 kg/m²) and 33 obese subjects (BMI ≥25 kg/m²) were collected and DNA was extracted prior to colonoscopy. After terminal restriction fragment length polymorphism (T-RFLP) analysis, samples from 10 subjects (4 non-obese and 6 obese) were selected and subjected to next-generation sequencing for species-level analysis.

Results

T-RFLP analysis showed significantly reduced numbers of Bacteroidetes and a higher Firmicutes to Bacteroidetes ratio in obese subjects compared with non-obese subjects. Bacterial diversity was significantly greater in obese subjects compared with non-obese subjects. Next-generation sequencing revealed that obese and non-obese subjects had different gut microbiota compositions and that certain bacterial species were significantly associated with each group (obese: Blautia hydrogenotorophica, Coprococcus catus, Eubacterium ventriosum, Ruminococcus bromii, Ruminococcus obeum; non-obese: Bacteroides faecichinchillae, Bacteroides thetaiotaomicron, Blautia wexlerae, Clostridium bolteae, Flavonifractor plautii).

Conclusion

Gut microbial properties differ between obese and non-obese subjects in Japan, suggesting that gut microbiota composition is related to obesity.

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Title: Comparison of the gut microbiota composition between obese and non-obese individuals in a Japanese population, as analyzed by terminal restriction fragment length polymorphism and next-generation sequencing
Authors: Chika Kasai
Kazushi Sugimoto
Isao Moritani
Junichiro Tanaka
Yumi Oya
Hidekazu Inoue
Masahiko Tameda
Katsuya Shiraki
Masaaki Ito
Yoshiyuki Takei
Kojiro Takase
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: BMC Gastroenterology / Issue 1/2015
Electronic ISSN: 1471-230X
DOI: https://doi.org/10.1186/s12876-015-0330-2

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Comparison of the gut microbiota composition between obese and non-obese individuals in a Japanese population, as analyzed by terminal restriction fragment length polymorphism and next-generation sequencing

Abstract

Background

Methods

Results

Conclusion

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Abstract

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