ナガタ　サトル   Nagata Satoru   永田　智    所属   医学部 医学科（東京女子医科大学病院）    職種   教授・基幹分野長
論文種別	その他
言語種別	英語
査読の有無	査読あり
表題	Evolution of gut Bifidobacterium population in healthy Japanese infants over the first three years of life: a quantitative assessment.
掲載誌名	正式名：Scientific reports 略　 称：Sci Rep ISSNコード：20452322/20452322
掲載区分	国外
巻・号・頁	7(1),pp.10097
著者・共著者	Nagpal Ravinder, Kurakawa Takashi, Tsuji Hirokazu, Takahashi Takuya, Kawashima Kazunari, Nagata Satoru, Nomoto Koji, Yamashiro Yuichiro
発行年月	2017/08
概要	Bifidobacteria are important members of human gut microbiota; however, quantitative data on their early-life dynamics is limited. Here, using a sensitive reverse transcription-qPCR approach, we demonstrate the carriage of eight signature infant-associated Bifidobacterium species (B. longum, B. breve, B. bifidum, B. catenulatum group, B. infantis, B. adolescentis, B. angulatum and B. dentium) in 76 healthy full-term vaginally-born infants from first day to three years of life. About 21% babies carry bifidobacteria at first day of life (6.2 ± 1.9 log10 cells/g feces); and this carriage increases to 64% (8.0 ± 2.2), 79% (8.5 ± 2.1), 97% (9.3 ± 1.8), 99% (9.6 ± 1.6), and 100% (9.7 ± 0.9) at age 7 days, 1, 3 and 6 months, and 3 years, respectively. B. longum, B. breve, B. catenulatum group and B. bifidum are among the earliest and abundant bifidobacterial clades. Interestingly, infants starting formula-feed as early as first week of life have higher bifidobacterial carriage compared to exclusively breast-fed counterparts. Bifidobacteria demonstrate an antagonistic correlation with enterobacteria and enterococci. Further analyses also reveal a relatively lower/ delayed bifidobacterial carriage in cesarean-born babies. The study presents a quantitative perspective of the early-life gut Bifidobacterium colonization and shows how factors such as birth and feeding modes could influence this acquisition even in healthy infants.
DOI	10.1038/s41598-017-10711-5
PMID	28855672