SMRT sequencing and ddPCR reveal the complexity of developmental trajectories and temporal dynamics of gut bifidobacterial communities in infants  

作　　者：Xu Gao Tao Zhang Xiaoye Bai Qiannan Wen Dongyu Li Lai-Yu Kwok Heping Zhang Zhihong Sun 

机构地区：[1]Key Laboratory of Dairy Biotechnology and Engineering,Ministry of Education,Key Laboratory of Dairy Products Processing,Ministry of Agriculture and Rural Affairs,Inner Mongolia Key Laboratory of Dairy Biotechnology and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China

出　　处：《Food Science and Human Wellness》2023年第5期1743-1750,共8页食品科学与人类健康（英文）

基　　金：supported by the National Natural Science Foundation of China (31972083);the Natural Science Foundation of Inner Mongolia Autonomous Region (2020ZD12);the Inner Mongolia Science and Technology Major Projects (2021ZD0014);the Inner Mongolia Science & Technology Planning Project (2022YFSJ0017);China Agriculture Research System of MOF and MARA。

摘　　要：Infant intestinal microbiome is closely linked with health and risk of disease. Bifidobacterium are important components of the infant gut and are known to confer various health effects on the host. However, few studies have described the precise composition and dynamics of early infant gut bifidobacterial communities. Thus, this was a pilot study aiming to describe the developmental trajectories and temporal dynamics of bifidobacterial communities in infants before 6 months of age. A total of 28 fecal samples from 4 infants(GF, ZZ, QM, TN, respectively)were collected and analyzed after 5, 15, 30, 60, 90, 120, 150, and 180 days of birth by a bifidobacteria-target method(based on single-molecule real-time sequencing of partial bifidobacterial rpsK genes)in conjunction with droplet digital polymerase chain reaction(ddPCR). The infant fecal microbiota comprised a total of 11 bifidobacterial species, including 4 major species, i.e., B. dentium(37.35%), B. catenulatum(32.04%), B. breve(22.24%), and B. animalis(8.02%). The infant microbiota showed highly individualized developmental trajectories. The leading species for GF was B. catenulatum, with a relatively stable developmental trajectory. In ZZ, B. breve was enriched, and the developmental trajectory was rather fluctuating. The most abundant species for QM and TN was B. dentium. The developmental trajectory of B. dentium in QM showed a trend of gradual decrease, whereas an opposite trend was seen in samples of TN. The results of ddPCR confirmed large variations in quantities of bifidobacteria between infants and suggested discordances in temporal dynamics of bifidobacterial communities during the first half year of infancy. In conclusion, our results suggested that the early infant gut bifidobacterial microbiota was highly complex and temporal dynamics, with individualized developmental trajectories, which should be considered in future research of infant gut microbiota.

关 键 词：INFANTS Gut microbiota BIFIDOBACTERIUM Diversity Single-molecule real-time(SMRT)sequencing Droplet digital polymerase chain reaction 

分 类 号：R725.7[医药卫生—儿科]