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Nweze JE, Gupta S, Salcher MM, Šustr V, Horváthová T, Angel R. Disruption of millipede-gut microbiota in E. pulchripes and G. connexa highlights the limited role of litter fermentation and the importance of litter-associated microbes for nutrition. Commun Biol 2024; 7:1204. [PMID: 39342029 PMCID: PMC11438867 DOI: 10.1038/s42003-024-06821-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Accepted: 09/02/2024] [Indexed: 10/01/2024] Open
Abstract
Millipedes are thought to depend on their gut microbiome for processing plant-litter-cellulose through fermentation, similar to many other arthropods. However, this hypothesis lacks sufficient evidence. To investigate this, we used inhibitors to disrupt the gut microbiota of juvenile Epibolus pulchripes (tropical, CH4-emitting) and Glomeris connexa (temperate, non-CH4-emitting) and isotopic labelling. Feeding the millipedes sterile or antibiotics-treated litter reduced faecal production and microbial load without major impacts on survival or weight. Bacterial diversity remained similar, with Bacteroidota dominant in E. pulchripes and Pseudomonadota in G. connexa. Sodium-2-bromoethanesulfonate treatment halted CH4 emissions in E. pulchripes, but it resumed after returning to normal feeding. Employing 13C-labeled leaf litter and RNA-SIP revealed a slow and gradual prokaryote labelling, indicating a significant density shift only by day 21. Surprisingly, labelling of the fungal biomass was somewhat quicker. Our findings suggest that fermentation by the gut microbiota is likely not essential for the millipede's nutrition.
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Affiliation(s)
- Julius Eyiuche Nweze
- Institute of Soil Biology and Biogeochemistry, Biology Centre CAS, České Budějovice, Czechia
- Faculty of Science, University of South Bohemia in České Budějovice, České Budějovice, Czechia
| | - Shruti Gupta
- Institute of Soil Biology and Biogeochemistry, Biology Centre CAS, České Budějovice, Czechia
- Faculty of Science, University of South Bohemia in České Budějovice, České Budějovice, Czechia
| | - Michaela M Salcher
- Institute of Hydrobiology, Biology Centre CAS, České Budějovice, Czechia
| | - Vladimír Šustr
- Institute of Soil Biology and Biogeochemistry, Biology Centre CAS, České Budějovice, Czechia
| | - Terézia Horváthová
- Institute of Hydrobiology, Biology Centre CAS, České Budějovice, Czechia
- Department of Aquatic Ecology, EAWAG, Dübendorf, Switzerland
| | - Roey Angel
- Institute of Soil Biology and Biogeochemistry, Biology Centre CAS, České Budějovice, Czechia.
- Faculty of Science, University of South Bohemia in České Budějovice, České Budějovice, Czechia.
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Garg A, Gadi VK, Zhu HH, Sarmah AK, Sreeja P, Sekharan S. A geotechnical perspective on soil-termite interaction: Role of termites in unsaturated soil properties. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 895:164864. [PMID: 37331385 DOI: 10.1016/j.scitotenv.2023.164864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 05/24/2023] [Accepted: 06/11/2023] [Indexed: 06/20/2023]
Abstract
The soil-insect interaction has gathered significant attention in the recent years due to its contribution to bio-cementation. Termites, as a group of cellulose-eating insects, alter physical (texture) and chemical (chemical composition) properties of soil. Conversely, physico-chemical properties of soil also influence termite activities. It is vital to understand the soil-termite interaction and their influence on hydraulic properties and shear strength of soil, which are related to a series of geotechnical engineering problems such as ground water recharge, runoff, erosion and stability of slopes. In this study, an attempt has been made to review the latest developments and research gaps in our understanding of soil-termite interaction within the context of geo-environmental engineering. The hydraulic properties and shear strength of termite modified soil were discussed with respect to soil texture, density and physico-chemical composition. The incorporation of hysteresis effect of soil water characteristic curve, and spatio-temporal variations of hydraulic conductivity and shear strength of termite modified soil is proposed to be considered in geotechnical engineering design and construction. Finally, the challenges and future trends in this research area are presented. The expertise from both geotechnical engineering and entomology is needed to plan future research with an aim to promote use of termites as maintenance engineers in geotechnical infrastructure.
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Affiliation(s)
- Ankit Garg
- Department of Civil and Environmental Engineering, Shantou University, China.
| | - Vinay Kumar Gadi
- Department of Civil and Environmental Engineering, Cardiff University, United Kingdom.
| | - Hong-Hu Zhu
- School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China.
| | - Ajit K Sarmah
- Department of Civil & Environmental Engineering, The Faculty of Engineering, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
| | - P Sreeja
- Department of Civil Engineering, Indian Institute of Technology Guwahati, India.
| | - Sreedeep Sekharan
- Department of Civil Engineering, Indian Institute of Technology Guwahati, India.
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Takata M, Konishi T, Nagai S, Wu Y, Nozaki T, Tasaki E, Matsuura K. Discovery of an underground chamber to protect kings and queens during winter in temperate termites. Sci Rep 2023; 13:8809. [PMID: 37258652 DOI: 10.1038/s41598-023-36035-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 05/28/2023] [Indexed: 06/02/2023] Open
Abstract
Overwintering is a critical part of the annual cycle for species that live in temperate, polar, and alpine regions. Consequently, low-temperature biology is a key determinant of temperate species distribution. Termites are distributed predominantly in tropical regions, and a limited number of species are found in the temperate zone. Here, in the termite Reticulitermes speratus, we report the discovery of an underground chamber that protects kings and queens to survive the winter, which is separate from the one they used during the warmer breeding season. In the spring, the royals inhabited decayed logs on the ground, then moved to their underground chamber located in the roots of stumps in the fall. The winter minimum temperature measured in the royal chamber was higher than that in the logs on the ground. In overwintering termites, the kings and queens had higher cold tolerance than workers and soldiers. Air temperatures dropped below the critical temperature multiple times, as evidenced from the past 140 years of weather records in Kyoto. These results demonstrated the survival strategies of reproductives to overcome the environment at the latitudinal limits. This study helps further the understanding of the termite's seasonal phenology, long-term survivorship, and life cycle.
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Affiliation(s)
- Mamoru Takata
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.
| | - Takao Konishi
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Shuya Nagai
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yao Wu
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Tomonari Nozaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Eisuke Tasaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
- Department of Biology, Faculty of Science, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata, 950-2181, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
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Fitriana Y, Tampubolon DAT, Suharjo R, Lestari P, Swibawa IG. Lysinabacillus fusiformis and Paenibacillus alvei Obtained from the Internal of Nasutitermes Termites Revealed Their Ability as Antagonist of Plant Pathogenic Fungi. THE PLANT PATHOLOGY JOURNAL 2022; 38:449-460. [PMID: 36221917 PMCID: PMC9561155 DOI: 10.5423/ppj.oa.03.2022.0031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 07/14/2022] [Accepted: 07/17/2022] [Indexed: 06/13/2023]
Abstract
This study was performed to reveal phenotypic characters and identity of symbiont bacteria of Nasutitermes as well as investigate their potential as antagonist of plant pathogenic fungi. Isolation of the symbiont bacteria was carried out from inside the heads and the bodies of soldier and worker termite which were collected from 3 locations of nests. Identification was performed using phenotypic test and sequence of 16S ribosomal DNA (16S rDNA). Antagonistic capability was investigated in the laboratory against 3 phytopathogenic fungi i.e., Phytophthora capsici, Ganoderma boninense, and Rigidoporus microporus. Totally, 39 bacterial isolates were obtained from inside the heads and the bodies of Nasutitermes. All the isolates showed capability to inhibit growth of P. capsici, however, 34 isolates showed capability to inhibit growth of G. boninense and 32 isolates showed capability to inhibit growth of R. microporus. Two bacterial strains (IK3.1P and 1B1.2P) which showed the highest percentage of inhibition were further identified based on their sequence of 16S rDNA. The result showed that 1K3.1P strain was placed in the group of type strain and reference strains of Lysinibacillus fusiformis meanwhile 1B1.2P strain was grouped within type strain and reference strains Paenibacillus alvei. The result of this study supply valuable information on the role of symbiont bacteria of Nasutitermes, which may support the development of the control method of the three above-mentioned phytopathogenic fungi.
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Affiliation(s)
- Yuyun Fitriana
- Department of Plant Protection, Faculty of Agriculture, University of Lampung, Jl. Prof. Sumantri Brojonegoro I, Bandar Lampung 35145,
Indonesia
| | - Desi Apriani Teresa Tampubolon
- Department of Agrotechnology, Faculty of Agriculture, University of Lampung, Jl. Prof. Sumantri Brojonegoro I, Bandar Lampung 35145,
Indonesia
| | - Radix Suharjo
- Department of Plant Protection, Faculty of Agriculture, University of Lampung, Jl. Prof. Sumantri Brojonegoro I, Bandar Lampung 35145,
Indonesia
| | - Puji Lestari
- Department of Plant Protection, Faculty of Agriculture, University of Lampung, Jl. Prof. Sumantri Brojonegoro I, Bandar Lampung 35145,
Indonesia
| | - I Gede Swibawa
- Department of Plant Protection, Faculty of Agriculture, University of Lampung, Jl. Prof. Sumantri Brojonegoro I, Bandar Lampung 35145,
Indonesia
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Zeng W, Shen D, Chen Y, Zhang S, Wu W, Li Z. A High Soldier Proportion Encouraged the Greater Antifungal Immunity in a Subterranean Termite. Front Physiol 2022; 13:906235. [PMID: 35733990 PMCID: PMC9207448 DOI: 10.3389/fphys.2022.906235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Indexed: 11/25/2022] Open
Abstract
Termites possess a mighty social immune system, serving as one of the key obstacles to controlling them biologically. However, the dynamic mechanism coordinating the social immunologic defense and caste distribution of the termites remains elusive. This study used the Coptotermes formosanus Shiraki and an entomopathogenic fungus as a host–pathogen system and experimentally manipulated a series of groups with different caste compositions of workers and soldiers. Then, the impact of demography on the behavior and innate immunity of termites was explored by analyzing the fungus susceptibility of the respective caste, efficiencies, and caste preferences of sanitary care, as well as the expression of the immune genes and phenoloxidase activity. Overall, to ensure the general health and survival of a group, the infected workers were found to sacrifice their survivorship for maintaining the soldier proportion of the group. If soldier proportion was limited within a threshold, both the survivorship of the workers and soldiers were not significantly affected by the infection. Correspondingly, the infected group with a higher proportion of soldiers stimulated the higher efficiency of a non-caste-biased sanitary care of the workers to the nestmate workers and soldiers. Moreover, the innate immunities of the infected workers were found to be more intensely upregulated in the group with higher soldier proportions. This suggested that the adjustable non-caste-biased sanitary care and innate immunity of the workers would contribute to the flexibility of the worker–soldier caste ratio in C. formosanus. This study, therefore, enhanced our understanding of the functional adaptation mechanism between pathogen-driven social immunity and the demography of the termites.
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Gardner JG, Schreier HJ. Unifying themes and distinct features of carbon and nitrogen assimilation by polysaccharide-degrading bacteria: a summary of four model systems. Appl Microbiol Biotechnol 2021; 105:8109-8127. [PMID: 34611726 DOI: 10.1007/s00253-021-11614-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/20/2021] [Accepted: 09/21/2021] [Indexed: 11/24/2022]
Abstract
Our current understanding of enzymatic polysaccharide degradation has come from a huge number of in vitro studies with purified enzymes. While this vast body of work has been invaluable in identifying and characterizing novel mechanisms of action and engineering desirable traits into these enzymes, a comprehensive picture of how these enzymes work as part of a native in vivo system is less clear. Recently, several model bacteria have emerged with genetic systems that allow for a more nuanced study of carbohydrate active enzymes (CAZymes) and how their activity affects bacterial carbon metabolism. With these bacterial model systems, it is now possible to not only study a single nutrient system in isolation (i.e., carbohydrate degradation and carbon metabolism), but also how multiple systems are integrated. Given that most environmental polysaccharides are carbon rich but nitrogen poor (e.g., lignocellulose), the interplay between carbon and nitrogen metabolism in polysaccharide-degrading bacteria can now be studied in a physiologically relevant manner. Therefore, in this review, we have summarized what has been experimentally determined for CAZyme regulation, production, and export in relation to nitrogen metabolism for two Gram-positive (Caldicellulosiruptor bescii and Clostridium thermocellum) and two Gram-negative (Bacteroides thetaiotaomicron and Cellvibrio japonicus) polysaccharide-degrading bacteria. By comparing and contrasting these four bacteria, we have highlighted the shared and unique features of each, with a focus on in vivo studies, in regard to carbon and nitrogen assimilation. We conclude with what we believe are two important questions that can act as guideposts for future work to better understand the integration of carbon and nitrogen metabolism in polysaccharide-degrading bacteria. KEY POINTS: • Regardless of CAZyme deployment system, the generation of a local pool of oligosaccharides is a common strategy among Gram-negative and Gram-positive polysaccharide degraders as a means to maximally recoup the energy expenditure of CAZyme production and export. • Due to the nitrogen deficiency of insoluble polysaccharide-containing substrates, Gram-negative and Gram-positive polysaccharide degraders have a diverse set of strategies for supplementation and assimilation. • Future work needs to precisely characterize the energetic expenditures of CAZyme deployment and bolster our understanding of how carbon and nitrogen metabolism are integrated in both Gram-negative and Gram-positive polysaccharide-degrading bacteria, as both of these will significantly influence a given bacterium's suitability for biotechnology applications.
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Affiliation(s)
- Jeffrey G Gardner
- Department of Biological Sciences, University of Maryland, Baltimore County, Baltimore, MD, USA.
| | - Harold J Schreier
- Department of Biological Sciences, University of Maryland, Baltimore County, Baltimore, MD, USA.,Department of Marine Biotechnology, Institute of Marine and Environmental Technology, University of Maryland, Baltimore County, Baltimore, MD, USA
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Bayen S, Roy S, Chakraborti D, Mukhopadhyay A, Hazarika LK, Pramanik P, Borchetia S, Mukherjee S. Mutualistic relation of termites with associated microbes for their harmonious survival. Symbiosis 2021. [DOI: 10.1007/s13199-021-00809-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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8
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de Jonge N, Michaelsen TY, Ejbye-Ernst R, Jensen A, Nielsen ME, Bahrndorff S, Nielsen JL. Housefly (Musca domestica L.) associated microbiota across different life stages. Sci Rep 2020; 10:7842. [PMID: 32398740 PMCID: PMC7217826 DOI: 10.1038/s41598-020-64704-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 04/21/2020] [Indexed: 12/18/2022] Open
Abstract
The housefly (Musca domestica L.) lives in close association with its microbiota and its symbionts are suggested to have pivotal roles in processes such as metabolism and immune response, but it is unclear how the profound physiological changes during ontogeny affect the housefly’s associated microbiota and their metabolic capabilities. The present study applies 16S rRNA gene amplicon sequencing to investigate the development of the host-associated microbiota during ontogeny. The potential for microbiota transfer between developmental stages, and the metabolic potential of these microbiota were evaluated. Representatives of Firmicutes were observed as early colonisers during the larval stages, followed by colonisation by organisms affiliating with Proteobacteria and Bacteroidetes as the flies matured into adults. Microbiota observed across all the developmental stages included Lactococcus, Lactobacillus and Enterococcus, while Weissella and Chishuiella were associated with newly hatched larvae and adults, respectively. Predictive metabolic profiling of the identified microorganisms further suggested that the microbiota and their functional profile mature alongside their host and putative host-microbe relationships are established at different stages of development. The predicted metabolic capability of the microbiota developed from primarily simple processes including carbohydrate and nucleotide metabolisms, to more complex metabolic pathways including amino acid metabolisms and processes related to signal transduction.
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Affiliation(s)
- Nadieh de Jonge
- Department of Chemistry and Bioscience, Aalborg University, DK-9220, Aalborg East, Denmark
| | | | - Rasmus Ejbye-Ernst
- Department of Chemistry and Bioscience, Aalborg University, DK-9220, Aalborg East, Denmark
| | - Anne Jensen
- Department of Chemistry and Bioscience, Aalborg University, DK-9220, Aalborg East, Denmark
| | - Majken Elley Nielsen
- Department of Chemistry and Bioscience, Aalborg University, DK-9220, Aalborg East, Denmark
| | - Simon Bahrndorff
- Department of Chemistry and Bioscience, Aalborg University, DK-9220, Aalborg East, Denmark
| | - Jeppe Lund Nielsen
- Department of Chemistry and Bioscience, Aalborg University, DK-9220, Aalborg East, Denmark.
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Ali HRK, Hemeda NF, Abdelaliem YF. Symbiotic cellulolytic bacteria from the gut of the subterranean termite Psammotermes hypostoma Desneux and their role in cellulose digestion. AMB Express 2019; 9:111. [PMID: 31317283 PMCID: PMC6637158 DOI: 10.1186/s13568-019-0830-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 07/04/2019] [Indexed: 11/30/2022] Open
Abstract
The subterranean termite Psammotermes hypostoma Desneux is considered as an important pest that could cause severe damage to buildings, furniture, silos of grain and crops or any material containing cellulose. This species of termites is widespread in Egypt and Africa. The lower termite’s ability to digest cellulose depends on the association of symbiotic organisms gut that digest cellulose (flagellates and bacteria). In this study, 33 different bacterial isolates were obtained from the gut of the termite P. hypostoma which were collected using cellulose traps. Strains were grown on carboxymethylcellulose (CMC) as a sole source of carbon. Cellulolytic strains were isolated in two different cellulose medium (mineral salt medium containing carboxymethylcellulose as the sole carbon source and agar cellulose medium). Five isolates showed significant cellulolytic activity identified by a Congo red assay which gives clear zone. Based on biochemical tests and sequencing of 16s rRNA genes these isolates were identified as Paenibacillus lactis, Lysinibacillus macrolides, Stenotrophomonas maltophilia, Lysinibacillus fusiformis and Bacillus cereus, that deposited in GenBank with accession numbers MG991563, MG991564, MG991565, MG991566 and MG991567, respectively.
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Shapiro JA. Living Organisms Author Their Read-Write Genomes in Evolution. BIOLOGY 2017; 6:E42. [PMID: 29211049 PMCID: PMC5745447 DOI: 10.3390/biology6040042] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 11/17/2017] [Accepted: 11/28/2017] [Indexed: 12/18/2022]
Abstract
Evolutionary variations generating phenotypic adaptations and novel taxa resulted from complex cellular activities altering genome content and expression: (i) Symbiogenetic cell mergers producing the mitochondrion-bearing ancestor of eukaryotes and chloroplast-bearing ancestors of photosynthetic eukaryotes; (ii) interspecific hybridizations and genome doublings generating new species and adaptive radiations of higher plants and animals; and, (iii) interspecific horizontal DNA transfer encoding virtually all of the cellular functions between organisms and their viruses in all domains of life. Consequently, assuming that evolutionary processes occur in isolated genomes of individual species has become an unrealistic abstraction. Adaptive variations also involved natural genetic engineering of mobile DNA elements to rewire regulatory networks. In the most highly evolved organisms, biological complexity scales with "non-coding" DNA content more closely than with protein-coding capacity. Coincidentally, we have learned how so-called "non-coding" RNAs that are rich in repetitive mobile DNA sequences are key regulators of complex phenotypes. Both biotic and abiotic ecological challenges serve as triggers for episodes of elevated genome change. The intersections of cell activities, biosphere interactions, horizontal DNA transfers, and non-random Read-Write genome modifications by natural genetic engineering provide a rich molecular and biological foundation for understanding how ecological disruptions can stimulate productive, often abrupt, evolutionary transformations.
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Affiliation(s)
- James A Shapiro
- Department of Biochemistry and Molecular Biology, University of Chicago GCIS W123B, 979 E. 57th Street, Chicago, IL 60637, USA.
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Peterson BF, Scharf ME. Metatranscriptome analysis reveals bacterial symbiont contributions to lower termite physiology and potential immune functions. BMC Genomics 2016; 17:772. [PMID: 27716053 PMCID: PMC5045658 DOI: 10.1186/s12864-016-3126-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Accepted: 09/26/2016] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Symbioses throughout the animal kingdom are known to extend physiological and ecological capabilities to hosts. Insect-microbe associations are extremely common and are often related to novel niche exploitation, fitness advantages, and even speciation events. These phenomena include expansions in host diet, detoxification of insecticides and toxins, and increased defense against pathogens. However, dissecting the contributions of individual groups of symbionts at the molecular level is often underexplored due to methodological and analytical limitations. Termites are one of the best studied systems for physiological collaborations between host and symbiota; however, most work in lower termites (those with bacterial and protist symbionts) focuses on the eukaryotic members of this symbiotic consortium. Here we present a metatranscriptomic analysis which provides novel insights into bacterial contributions to the holobiont of the eastern subterranean termite, Reticulitermes flavipes, in the presence and absence of a fungal pathogen. RESULTS Using a customized ribodepletion strategy, a metatranscriptome assembly was obtained representing the host termite as well as bacterial and protist symbiota. Sequence data provide new insights into biosynthesis, catabolism, and transport of major organic molecules and ions by the gut consortium, and corroborate previous findings suggesting that bacteria play direct roles in nitrogen fixation, amino acid biosynthesis, and lignocellulose digestion. With regard to fungal pathogen challenge, a total of 563 differentially expressed candidate host and symbiont contigs were identified (162 up- and 401 downregulated; α/FDR = 0.05) including an upregulated bacterial amidohydrolase. CONCLUSIONS This study presents the most complete bacterial metatranscriptome from a lower termite and provides a framework on which to build a more complete model of termite-symbiont interactions including, but not limited to, digestion and pathogen defense.
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Affiliation(s)
- Brittany F Peterson
- Department of Entomology, Purdue University, 901 W. State St, West Lafayette, IN, 47907-2089, USA. .,Present address: Center for Insect Science, University of Arizona, 1007 E. Lowell St, Tucson, AZ, 85721, USA.
| | - Michael E Scharf
- Department of Entomology, Purdue University, 901 W. State St, West Lafayette, IN, 47907-2089, USA
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Franzini PZN, Ramond JB, Scholtz CH, Sole CL, Ronca S, Cowan DA. The Gut Microbiomes of Two Pachysoma MacLeay Desert Dung Beetle Species (Coleoptera: Scarabaeidae: Scarabaeinae) Feeding on Different Diets. PLoS One 2016; 11:e0161118. [PMID: 27532606 PMCID: PMC4988786 DOI: 10.1371/journal.pone.0161118] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 07/29/2016] [Indexed: 12/13/2022] Open
Abstract
Micro-organisms inhabiting animal guts benefit from a protected and nutrient-rich environment while assisting the host with digestion and nutrition. In this study we compare, for the first time, the bacterial and fungal gut communities of two species of the small desert dung beetle genus Pachysoma feeding on different diets: the detritivorous P. endroedyi and the dry-dung-feeding P. striatum. Whole-gut microbial communities from 5 individuals of each species were assessed using 454 pyrosequencing of the bacterial 16S rRNA gene and fungal ITS gene regions. The two bacterial communities were significantly different, with only 3.7% of operational taxonomic units shared, and displayed intra-specific variation. The number of bacterial phyla present within the guts of P. endroedyi and P. striatum individuals ranged from 6-11 and 4-7, respectively. Fungal phylotypes could only be detected within the gut of P. striatum. Although the role of host phylogeny in Pachysoma microbiome assembly remains unknown, evidence presented in this study suggests that host diet may be a deterministic factor.
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Affiliation(s)
- Philippa Z. N. Franzini
- Centre for Microbial Ecology and Genomics, Genomic Research Institute, Department of Genetics, University of Pretoria, Pretoria, South Africa
| | - Jean-Baptiste Ramond
- Centre for Microbial Ecology and Genomics, Genomic Research Institute, Department of Genetics, University of Pretoria, Pretoria, South Africa
| | - Clarke H. Scholtz
- Scarab Research Group, Department of Zoology and Entomology, University of Pretoria, Pretoria, South Africa
| | - Catherine L. Sole
- Scarab Research Group, Department of Zoology and Entomology, University of Pretoria, Pretoria, South Africa
| | - Sandra Ronca
- Centre for Microbial Ecology and Genomics, Genomic Research Institute, Department of Genetics, University of Pretoria, Pretoria, South Africa
| | - Don A. Cowan
- Centre for Microbial Ecology and Genomics, Genomic Research Institute, Department of Genetics, University of Pretoria, Pretoria, South Africa
- * E-mail:
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Abdul Rahman N, Parks DH, Willner DL, Engelbrektson AL, Goffredi SK, Warnecke F, Scheffrahn RH, Hugenholtz P. A molecular survey of Australian and North American termite genera indicates that vertical inheritance is the primary force shaping termite gut microbiomes. MICROBIOME 2015; 3:5. [PMID: 25830022 PMCID: PMC4379614 DOI: 10.1186/s40168-015-0067-8] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Accepted: 01/02/2015] [Indexed: 05/25/2023]
Abstract
BACKGROUND Termites and their microbial gut symbionts are major recyclers of lignocellulosic biomass. This important symbiosis is obligate but relatively open and more complex in comparison to other well-known insect symbioses such as the strict vertical transmission of Buchnera in aphids. The relative roles of vertical inheritance and environmental factors such as diet in shaping the termite gut microbiome are not well understood. RESULTS The gut microbiomes of 66 specimens representing seven higher and nine lower termite genera collected in Australia and North America were profiled by small subunit (SSU) rRNA amplicon pyrosequencing. These represent the first reported culture-independent gut microbiome data for three higher termite genera: Tenuirostritermes, Drepanotermes, and Gnathamitermes; and two lower termite genera: Marginitermes and Porotermes. Consistent with previous studies, bacteria comprise the largest fraction of termite gut symbionts, of which 11 phylotypes (6 Treponema, 1 Desulfarculus-like, 1 Desulfovibrio, 1 Anaerovorax-like, 1 Sporobacter-like, and 1 Pirellula-like) were widespread occurring in ≥50% of collected specimens. Archaea are generally considered to comprise only a minority of the termite gut microbiota (<3%); however, archaeal relative abundance was substantially higher and variable in a number of specimens including Macrognathotermes, Coptotermes, Schedorhinotermes, Porotermes, and Mastotermes (representing up to 54% of amplicon reads). A ciliate related to Clevelandella was detected in low abundance in Gnathamitermes indicating that protists were either reacquired after protists loss in higher termites or persisted in low numbers across this transition. Phylogenetic analyses of the bacterial communities indicate that vertical inheritance is the primary force shaping termite gut microbiota. The effect of diet is secondary and appears to influence the relative abundance, but not membership, of the gut communities. CONCLUSIONS Vertical inheritance is the primary force shaping the termite gut microbiome indicating that species are successfully and faithfully passed from one generation to the next via trophallaxis or coprophagy. Changes in relative abundance can occur on shorter time scales and appear to be an adaptive mechanism for dietary fluctuations.
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Affiliation(s)
- Nurdyana Abdul Rahman
- />Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Brisbane, Queensland Australia
| | - Donovan H Parks
- />Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Brisbane, Queensland Australia
| | - Dana L Willner
- />Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Brisbane, Queensland Australia
- />Current address: Department of Statistics, University of Illinois Urbana-Champaign, Champaign, IL USA
| | - Anna L Engelbrektson
- />DOE Joint Genome Institute, Walnut Creek, CA USA
- />Current address: Energy Biosciences Institute, University of California, Berkeley, CA USA
| | | | - Falk Warnecke
- />DOE Joint Genome Institute, Walnut Creek, CA USA
- />Jena School for Microbial Communication (JSMC) and Microbial Ecology Group, Friedrich Schiller University Jena, Jena, Germany
| | - Rudolf H Scheffrahn
- />Fort Lauderdale Research and Education Center, University of Florida, Davie, FL USA
| | - Philip Hugenholtz
- />Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Brisbane, Queensland Australia
- />DOE Joint Genome Institute, Walnut Creek, CA USA
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The role of host phylogeny varies in shaping microbial diversity in the hindguts of lower termites. Appl Environ Microbiol 2014; 81:1059-70. [PMID: 25452280 DOI: 10.1128/aem.02945-14] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The hindguts of lower termites and Cryptocercus cockroaches are home to a distinct community of archaea, bacteria, and protists (primarily parabasalids and some oxymonads). Within a host species, the composition of these hindgut communities appears relatively stable, but the evolutionary and ecological factors structuring community composition and stability are poorly understood, as are differential impacts of these factors on protists, bacteria, and archaea. We analyzed the microbial composition of parabasalids and bacteria in the hindguts of Cryptocercus punctulatus and 23 species spanning 4 families of lower termites by pyrosequencing variable regions of the small-subunit rRNA gene. Especially for the parabasalids, these data revealed undiscovered taxa and provided a phylogenetic basis for a more accurate understanding of diversity, diversification, and community composition. The composition of the parabasalid communities was found to be strongly structured by the phylogeny of their hosts, indicating the importance of historical effects, although exceptions were also identified. Particularly, spirotrichonymphids and trichonymphids likely were transferred between host lineages. In contrast, host phylogeny was not sufficient to explain the majority of bacterial community composition, but the compositions of the Bacteroidetes, Elusimicrobia, Tenericutes, Spirochaetes, and Synergistes were structured by host phylogeny perhaps due to their symbiotic associations with protists. All together, historical effects probably resulting from vertical inheritance have had a prominent role in structuring the hindgut communities, especially of the parabasalids, but dispersal and environmental acquisition have played a larger role in community composition than previously expected.
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Kurtböke DI, French JRJ, Hayes RA, Quinn RJ. Eco-taxonomic insights into actinomycete symbionts of termites for discovery of novel bioactive compounds. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2014; 147:111-35. [PMID: 24817085 DOI: 10.1007/10_2014_270] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Termites play a major role in foraging and degradation of plant biomass as well as cultivating bioactive microorganisms for their defense. Current advances in "omics" sciences are revealing insights into function-related presence of these symbionts, and their related biosynthetic activities and genes identified in gut symbiotic bacteria might offer a significant potential for biotechnology and biodiscovery. Actinomycetes have been the major producers of bioactive compounds with an extraordinary range of biological activities. These metabolites have been in use as anticancer agents, immune suppressants, and most notably, as antibiotics. Insect-associated actinomycetes have also been reported to produce a range of antibiotics such as dentigerumycin and mycangimycin. Advances in genomics targeting a single species of the unculturable microbial members are currently aiding an improved understanding of the symbiotic interrelationships among the gut microorganisms as well as revealing the taxonomical identity and functions of the complex multilayered symbiotic actinofloral layers. If combined with target-directed approaches, these molecular advances can provide guidance towards the design of highly selective culturing methods to generate further information related to the physiology and growth requirements of these bioactive actinomycetes associated with the termite guts. This chapter provides an overview on the termite gut symbiotic actinoflora in the light of current advances in the "omics" science, with examples of their detection and selective isolation from the guts of the Sunshine Coast regional termite Coptotermes lacteus in Queensland, Australia.
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Affiliation(s)
- D Ipek Kurtböke
- Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Maroochydore DC, QLD, 4558, Australia,
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Yukuhiro F, Miyoshi T, Noda H. Actin-mediated transovarial transmission of a yeastlike symbiont in the brown planthopper. JOURNAL OF INSECT PHYSIOLOGY 2014; 60:111-117. [PMID: 24315960 DOI: 10.1016/j.jinsphys.2013.11.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 11/25/2013] [Accepted: 11/25/2013] [Indexed: 06/02/2023]
Abstract
The brown planthopper Nilaparvata lugens (Hemiptera, Delphacidae) harbors an obligate endosymbiont called the yeastlike symbiont (YLS) in their abdominal fat body. YLS, a filamentous ascomycete belonging to the family Clavicipitaceae, does not spend any part of its life cycle outside the planthopper's body. The YLS is transferred to the next generation via transovarial transmission; it enters the epithelial plug at the posterior end of the host female's ovariole and is transferred to her offspring. In the present study, microscopic examination revealed that actin filaments play an important role in the transmission of YLS. An irregular cell protrusion on the surface of the epithelial plug facilitated the uptake of the YLS, which was then incorporated into the epithelial plug cell. Actin assembly apparently produces the protrusion and actin appears to participate in almost every stage of the process, from the entry of the YLS into the epithelial plug to its delivery to the oocyte. The epithelial plug employs a recognition system for YLS, which drastically changes the cell surface structure to enable the YLS to enter the ovariole.
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Affiliation(s)
- Fumiko Yukuhiro
- National Institute of Agrobiological Sciences, Owashi, Tsukuba, Ibaraki 305-8634, Japan
| | - Takeharu Miyoshi
- National Institute of Agrobiological Sciences, Owashi, Tsukuba, Ibaraki 305-8634, Japan
| | - Hiroaki Noda
- National Institute of Agrobiological Sciences, Owashi, Tsukuba, Ibaraki 305-8634, Japan.
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Burke GR, Thomas SA, Eum JH, Strand MR. Mutualistic polydnaviruses share essential replication gene functions with pathogenic ancestors. PLoS Pathog 2013; 9:e1003348. [PMID: 23671417 PMCID: PMC3649998 DOI: 10.1371/journal.ppat.1003348] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 03/23/2013] [Indexed: 11/24/2022] Open
Abstract
Viruses are usually thought to form parasitic associations with hosts, but all members of the family Polydnaviridae are obligate mutualists of insects called parasitoid wasps. Phylogenetic data founded on sequence comparisons of viral genes indicate that polydnaviruses in the genus Bracovirus (BV) are closely related to pathogenic nudiviruses and baculoviruses. However, pronounced differences in the biology of BVs and baculoviruses together with high divergence of many shared genes make it unclear whether BV homologs still retain baculovirus-like functions. Here we report that virions from Microplitis demolitor bracovirus (MdBV) contain multiple baculovirus-like and nudivirus-like conserved gene products. We further show that RNA interference effectively and specifically knocks down MdBV gene expression. Coupling RNAi knockdown methods with functional assays, we examined the activity of six genes in the MdBV conserved gene set that are known to have essential roles in transcription (lef-4, lef-9), capsid assembly (vp39, vlf-1), and envelope formation (p74, pif-1) during baculovirus replication. Our results indicated that MdBV produces a baculovirus-like RNA polymerase that transcribes virus structural genes. Our results also supported a conserved role for vp39, vlf-1, p74, and pif-1 as structural components of MdBV virions. Additional experiments suggested that vlf-1 together with the nudivirus-like gene int-1 also have novel functions in regulating excision of MdBV proviral DNAs for packaging into virions. Overall, these data provide the first experimental insights into the function of BV genes in virion formation. Microorganisms form symbiotic associations with animals and plants that range from parasitic (pathogens) to beneficial (mutualists). Although numerous examples of obligate, mutualistic bacteria, fungi, and protozoans exist, viruses are almost always considered to be pathogens. An exception is the family Polydnaviridae, which consists of large DNA viruses that are obligate mutualists of insects called parasitoid wasps. Prior studies show that polydnaviruses in the genus Bracovirus evolved approximately 100 million years ago from a group of viruses called nudiviruses, which are themselves closely related to a large family of insect pathogens called baculoviruses. Polydnaviruses are thus of fundamental interest for understanding the processes by which viruses can evolve into mutualists. In this study we characterized the composition of virus particles from Microplitis demolitor bracovirus (MdBV) and conducted functional experiments to assess whether BV genes share similar functions with related essential baculovirus replication genes. Our results indicate that several genes in MdBV retain ancestral functions, but select other genes have novel functions unknown from baculoviruses. Our results also provide the first experimental data on the function of polydnavirus replication genes and enhance understanding of the similarities between these viruses and their pathogenic ancestors.
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Affiliation(s)
- Gaelen R. Burke
- Department of Entomology, University of Georgia, Athens, Georgia, United States of America
- * E-mail: (GRB); (MRS)
| | - Sarah A. Thomas
- Department of Entomology, University of Georgia, Athens, Georgia, United States of America
| | - Jai H. Eum
- Department of Entomology, University of Georgia, Athens, Georgia, United States of America
| | - Michael R. Strand
- Department of Entomology, University of Georgia, Athens, Georgia, United States of America
- * E-mail: (GRB); (MRS)
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Kamke J, Bayer K, Woyke T, Hentschel U. Exploring symbioses by single-cell genomics. THE BIOLOGICAL BULLETIN 2012; 223:30-43. [PMID: 22983031 DOI: 10.1086/bblv223n1p30] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Single-cell genomics has advanced the field of microbiology from the analysis of microbial metagenomes where information is "drowning in a sea of sequences," to recognizing each microbial cell as a separate and unique entity. Single-cell genomics employs Phi29 polymerase-mediated whole-genome amplification to yield microgram-range genomic DNA from single microbial cells. This method has now been applied to a handful of symbiotic systems, including bacterial symbionts of marine sponges, insects (grasshoppers, termites), and vertebrates (mouse, human). In each case, novel insights were obtained into the functional genomic repertoire of the bacterial partner, which, in turn, led to an improved understanding of the corresponding host. Single-cell genomics is particularly valuable when dealing with uncultivated microorganisms, as is still the case for many bacterial symbionts. In this review, we explore the power of single-cell genomics for symbiosis research and highlight recent insights into the symbiotic systems that were obtained by this approach.
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Affiliation(s)
- Janine Kamke
- Julius-von-Sachs Institute for Biological Sciences, University of Würzburg, Julius-von-Sachs Platz 3, 97082 Würzburg, Germany
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19
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Husseneder C, McGregor C, Lang RP, Collier R, Delatte J. Transcriptome profiling of female alates and egg-laying queens of the Formosan subterranean termite. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2011; 7:14-27. [PMID: 22079412 DOI: 10.1016/j.cbd.2011.10.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 10/13/2011] [Accepted: 10/14/2011] [Indexed: 10/16/2022]
Abstract
Termites are known to have an extraordinary reproductive plasticity and capacity, but the underlying genetic patterns of termite reproductive biology are relatively understudied. The goal of this study was to identify genes for which expression levels differ between dealated precopulatory females (virgins) and egg-laying queens of the Formosan subterranean termite, Coptotermes formosanus Shiraki. We constructed a normalized polyphenic expressed sequence tag (EST) library that represents genomic material from most of the castes and life stages of the Formosan subterranean termite. Microarrays were designed using probes from this EST library and public genomic resources. Virgin females and queens were competitively hybridized to these microarrays and differentially expressed candidate genes were identified. Differential expression of eight genes was subsequently confirmed via reverse transcriptase quantitative PCR (RT-QPCR). When compared to virgins, queens had higher expression of genes coding for proteins related to immunity (gram negative binding protein), nutrition (e.g., termite-derived endo-beta-1,4-glucanase), protein storage, regulation of caste differentiation and reproduction (hexamerin, juvenile hormone binding protein). Queens also had higher transcript levels for genes involved in metabolism of xenobiotics, fat, and juvenile hormone (glutathione-S-transferase-like proteins, and cytochrome P450), among others. In particular, hexamerin, juvenile hormone binding protein, and a cytochrome P450 from the 4C subfamily are likely to be involved in initiating the inactive period during the reproductive cycle of the queen. Vice versa, virgins had higher expression than queens of genes related to respiration, probably due to recent flight activity, and several genes of unknown function.
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Affiliation(s)
- Claudia Husseneder
- Louisiana State University Agricultural Center, Department of Entomology, Baton Rouge, LA 70803, USA.
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20
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ROE AMANDAD, RICE ADRIANNEV, COLTMAN DAVIDW, COOKE JANICEEK, SPERLING FELIXAH. Comparative phylogeography, genetic differentiation and contrasting reproductive modes in three fungal symbionts of a multipartite bark beetle symbiosis. Mol Ecol 2010; 20:584-600. [DOI: 10.1111/j.1365-294x.2010.04953.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Husseneder C, Ho HY, Blackwell M. Comparison of the bacterial symbiont composition of the formosan subterranean termite from its native and introduced range. Open Microbiol J 2010; 4:53-66. [PMID: 21347207 PMCID: PMC3040989 DOI: 10.2174/1874285801004010053] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 06/24/2010] [Accepted: 06/29/2010] [Indexed: 02/01/2023] Open
Abstract
We investigated the bacterial composition in the gut of Formosan subterranean termites (FST), Coptotermes formosanus Shiraki, collected from southern China (native range) vs. Louisiana, U. S. (introduced range) using 16S rRNA gene sequencing. Overall, we identified 213 bacteria ribotypes from thirteen phyla. The enemy release hypothesis could not be invoked to explain invasion success of FST since no pathogens were found among the bacterial gut community regardless of geographic origin. Invasion of new habitats did not significantly change the bacteria composition. Apparently, the tight co-evolutionary link between termites and their gut flora maintains a certain association of species and functional groups. Ribotype richness, bacteria diversity, and proportions of detected phyla were not influenced by geographic origin of FST samples; however, these parameters were affected by storage of the samples. Ethanol storage of termite samples (5 yrs) increased the relative proportions of gram-positive bacteria versus gram-negative bacteria.
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Affiliation(s)
- Claudia Husseneder
- Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
| | - Huei-Yang Ho
- Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
| | - Meredith Blackwell
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
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