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Your search keyword '"Ojima, Miriam N"' showing total 13 results
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13 results on '"Ojima, Miriam N"'

2. A bacterial sulfoglycosidase highlights mucin O-glycan breakdown in the gut ecosystem

Author

Katoh, Toshihiko, Yamada, Chihaya, Wallace, Michael D., Yoshida, Ayako, Gotoh, Aina, Arai, Moe, Maeshibu, Takako, Kashima, Toma, Hagenbeek, Arno, Ojima, Miriam N., Takada, Hiromi, Sakanaka, Mikiyasu, Shimizu, Hidenori, Nishiyama, Keita, Ashida, Hisashi, Hirose, Junko, Suarez-Diez, Maria, Nishiyama, Makoto, Kimura, Ikuo, Stubbs, Keith A., Fushinobu, Shinya, and Katayama, Takane

Published
2023
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7. Diversification of a Fucosyllactose Transporter within the Genus Bifidobacterium

Author

Ojima, Miriam N., primary, Asao, Yuya, additional, Nakajima, Aruto, additional, Katoh, Toshihiko, additional, Kitaoka, Motomitsu, additional, Gotoh, Aina, additional, Hirose, Junko, additional, Urashima, Tadasu, additional, Fukiya, Satoru, additional, Yokota, Atsushi, additional, Abou Hachem, Maher, additional, Sakanaka, Mikiyasu, additional, and Katayama, Takane, additional

Published
2022
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9. Priority effects shape the structure of infant-type Bifidobacteriumcommunities on human milk oligosaccharides

Author

Ojima, Miriam N., Jiang, Lin, Arzamasov, Aleksandr A., Yoshida, Keisuke, Odamaki, Toshitaka, Xiao, Jinzhong, Nakajima, Aruto, Kitaoka, Motomitsu, Hirose, Junko, Urashima, Tadasu, Katoh, Toshihiko, Gotoh, Aina, van Sinderen, Douwe, Rodionov, Dmitry A., Osterman, Andrei L., Sakanaka, Mikiyasu, and Katayama, Takane

Abstract

Bifidobacteria are among the first colonizers of the infant gut, and human milk oligosaccharides (HMOs) in breastmilk are instrumental for the formation of a bifidobacteria-rich microbiota. However, little is known about the assembly of bifidobacterial communities. Here, by applying assembly theory to a community of four representative infant-gut associated Bifidobacteriumspecies that employ varied strategies for HMO consumption, we show that arrival order and sugar consumption phenotypes significantly affected community formation. Bifidobacterium bifidumand Bifidobacterium longumsubsp. infantis, two avid HMO consumers, dominate through inhibitory priority effects. On the other hand, Bifidobacterium breve, a species with limited HMO-utilization ability, can benefit from facilitative priority effects and dominates by utilizing fucose, an HMO degradant not utilized by the other bifidobacterial species. Analysis of publicly available breastfed infant faecal metagenome data showed that the observed trends for B. brevewere consistent with our in vitro data, suggesting that priority effects may have contributed to its dominance. Our study highlights the importance and history dependency of initial community assembly and its implications for the maturation trajectory of the infant gut microbiota.

Published
2022
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13. Interactive effects of disturbance and dispersal on community assembly.

Author

Ojima, Miriam N. and Jiang, Lin

Subjects
*PROTISTA, *DISPERSAL (Ecology), *BIOLOGICAL divergence, *BIOTIC communities, *DISPERSAL of microorganisms
Abstract

The traditional debate on alternative community states has been over whether or not they exist. Studies of community assembly have examined the role of assembly history in driving community divergence, but the context in which assembly history becomes important is a continued topic of interest. In this study, we created communities of bacterivorous ciliated protists in laboratory microcosms and manipulated assembly history, disturbance frequency, and the presence of dispersal among local communities to investigate the mechanisms behind community divergence. Specifically, we sought to understand how the role of assembly history changed in response to disturbance, dispersal, and the combination of the two. Assembly history influenced the identity of the dominant species through priority effects, and dispersal and disturbance showed interactive effects on both alpha and beta diversity. Dispersal substantially increased alpha diversity, but only in the absence of disturbance, and it reduced beta diversity, but not in the presence of low or mixed disturbance. These results demonstrate that the role of assembly history and the strength of priority effects depend on community context, suggesting that understanding the interactions between various factors shaping community assembly is important for understanding how ecological communities are structured. [ABSTRACT FROM AUTHOR]

Published
2017
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