Identifying genetic determinants needed to establish a human gut symbiont in its habitat.

Identifying genetic determinants needed to establish a human gut symbiont in its habitat.
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DOI:
10.1016/j.chom.2009.08.003
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发表时间:
2009-09-17
影响因子:
30.3
通讯作者:
Gordon JI
Gordon JI
中科院分区:
医学1区
文献类型:
--
作者:
Goodman AL;McNulty NP;Zhao Y;Leip D;Mitra RD;Lozupone CA;Knight R;Gordon JI

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The human gut microbiota is a metabolic organ whose cellular composition is determined by a dynamic process of selection and competition. To identify microbial genes required for establishment of human symbionts in the gut, we developed an approach (insertion-sequencing, or INSeq) based on a mutagenic transposon that allows capture of adjacent chromosomal DNA to define its genomic location. We used massively parallel sequencing to monitor the relative abundance of tens of thousands of transposon mutants of a saccharolytic human gut bacterium, Bacteroides thetaiotaomicron, as they established themselves in wild-type and immunodeficient gnotobiotic mice, in the presence or absence of other human gut commensals. In vivo selection transforms this population, revealing functions necessary for survival in the gut: we show how this selection is influenced by community composition and competition for nutrients (vitamin B12). INSeq provides a broadly applicable platform to explore microbial adaptation to the gut and other ecosystems.
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