メンデルのランダム化による微生物群と肥満関連がんリスクの関係
Thomas Yates1, Molly Went2, Charlie Mills2
1Division of Genetics and Epidemiology, The Institute of Cancer Research, Sutton, Surrey, UK. thomas.yates@icr.ac.uk.
International journal of obesity (2005)
|February 19, 2026
まとめ
肥満は癌のリスクを高め,腸内細菌が役割を果たす可能性がある. 特に,アクティノバクテリアは,肥満と結腸直腸がん (CRC) のリスクとの関連の重要な部分を媒介しています.
科学分野:
- 遺伝学と微生物学について
- 癌の流行病学について
- 腸内微生物群の研究
背景:
- 肥満は様々な癌の危険因子として知られていますが,その根本的なメカニズムは完全に理解されていません.
- 肥満に関連するがんリスクの仲介者としての腸内微生物群の潜在的な役割は,調査を必要とする.
研究 の 目的:
- 遺伝的に予測された肥満と癌のリスクとの因果関係を調査する.
- 腸内微生物群が肥満とがんとの関連を因果的に媒介するかどうかを判断する.
主な方法:
- 2つのサンプルのメンデルのランダム化とメディエーション分析が採用されました.
- この研究では,遺伝的に予測されたボディマス指数 (BMI) と腰から腰までの比率 (WHRadjBMI) を,ヨーロッパの祖先集団の211の腸内微生物種と8つの癌タイプに対して分析した.
- アソシエーションは,FinnGenコホートで検証されました.
主要な成果:
- 遺伝的に予測されたBMIは,大腸直腸,腎臓,子宮内膜,肺,食道がんのリスクの増加と有意に関連していました.
- 7つの腸内微生物系が結腸直腸がん (CRC) リスクと関連しており,アクティノバクテリアが最も強い関連性を示しています.
- アクチノバクテリアはBMIとCRCのリスク関係の21~29%を媒介し,全体で50%を占めていた.
結論:
- 腸内アクティノバクテリアは,肥満に起因する結腸直腸がん (CRC) リスクの重要な要因である可能性があります.
- 腸内微生物群をターゲットにすることは,肥満者のCRCリスクを減らすための潜在的な戦略です.
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