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Applied and Environmental Microbiology, November 2005, p. 6590-6599, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.6590-6599.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Intra- and Interspecific Comparisons of Bacterial Diversity and Community Structure Support Coevolution of Gut Microbiota and Termite Host{dagger}

Yuichi Hongoh,1,2* Pinsurang Deevong,3 Tetsushi Inoue,1 Shigeharu Moriya,1,2,4 Savitr Trakulnaleamsai,3 Moriya Ohkuma,2,5 Charunee Vongkaluang,6 Napavarn Noparatnaraporn,3 and Toshiaki Kudo1,2,4

International Cooperative Research Project, Japan Science and Technology Agency (JST-ICORP), Saitama 351-0198, Japan,1 Environmental Molecular Biology Laboratory, RIKEN, Saitama 351-0198, Japan,2 Department of Microbiology, Kasetsart University, Bangkok 10900, Thailand,3 Graduate School of Integrated Science, Yokohama City University, Kanagawa 230-0045, Japan,4 Precursor Research for Embryonic Science and Technology, JST (JST-PRESTO), Saitama 351-0198, Japan,5 Royal Forest Department, Bangkok 10900, Thailand6

Received 17 December 2004/ Accepted 1 June 2005

We investigated the bacterial gut microbiota from 32 colonies of wood-feeding termites, comprising four Microcerotermes species (Termitidae) and four Reticulitermes species (Rhinotermitidae), using terminal restriction fragment length polymorphism analysis and clonal analysis of 16S rRNA. The obtained molecular community profiles were compared statistically between individuals, colonies, locations, and species of termites. Both analyses revealed that the bacterial community structure was remarkably similar within each termite genus, with small but significant differences between sampling sites and/or termite species. In contrast, considerable differences were found between the two termite genera. Only one bacterial phylotype (defined with 97% sequence identity) was shared between the two termite genera, while 18% and 50% of the phylotypes were shared between two congeneric species in the genera Microcerotermes and Reticulitermes, respectively. Nevertheless, a phylogenetic analysis of 228 phylotypes from Microcerotermes spp. and 367 phylotypes from Reticulitermes spp. with other termite gut clones available in public databases demonstrated the monophyly of many phylotypes from distantly related termites. The monophyletic "termite clusters" comprised of phylotypes from more than one termite species were distributed among 15 bacterial phyla, including the novel candidate phyla TG2 and TG3. These termite clusters accounted for 95% of the 960 clones analyzed in this study. Moreover, the clusters in 12 phyla comprised phylotypes from more than one termite (sub)family, accounting for 75% of the analyzed clones. Our results suggest that the majority of gut bacteria are not allochthonous but are specific symbionts that have coevolved with termites and that their community structure is basically consistent within a genus of termites.


* Corresponding author. Mailing address: Environmental Molecular Biology Laboratory, RIKEN, Saitama 351-0198, Japan. Phone: 81-48-467-9648. Fax: 81-48-462-4672. E-mail: yhongo{at}postman.riken.go.jp.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.


Applied and Environmental Microbiology, November 2005, p. 6590-6599, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.6590-6599.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.




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