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Wu Y, Chen J, Takata M, Matsuura K. Maternal determination of soldier proportion and paternal determination of soldier sex ratio in hybrid Reticulitermes (Isoptera: Rhinotermitidae) termite colonies. PLoS One 2023; 18:e0293096. [PMID: 37917766 PMCID: PMC10621947 DOI: 10.1371/journal.pone.0293096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 10/05/2023] [Indexed: 11/04/2023] Open
Abstract
Altruistic caste, including worker and soldier (derived from worker), plays a critical role in the ecological success of social insects. The proportion of soldiers, soldier sex ratios, and the number of workers vary significantly between species, and also within species, depending on colony developmental stage and environmental factors. However, it is unknown whether there are sex-linked effects from parents on controlling the caste fate or not. Here, we compared soldier sex ratios, soldier proportions, and population size among a four mating types of Reticulitermes amamianus (Ra) and R. speratus (Rs) (male × female, mRa × fRa, mRa × fRs, mRs × fRa, mRs × fRs) and demonstrate that the soldier sex ratio and worker population size of hybrid colonies skew to colonies of king's species, while the soldier proportion skew to queen's species. The survival rate of offspring resulting from interspecies hybridization was significantly higher for mRa × fRs than for mRs × fRa. The results of this study demonstrate the asymmetric influence of kings and queens on caste determination and colony growth, which can contribute to our better understanding of parental influence on the colony dynamics of social insects.
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Affiliation(s)
- Yao Wu
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Jiaming Chen
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Mamoru Takata
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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Nozaki T, Tasaki E, Matsuura K. Cell type specific polyploidization in the royal fat body of termite queens. Zoological Lett 2023; 9:20. [PMID: 37821917 PMCID: PMC10566149 DOI: 10.1186/s40851-023-00217-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 08/09/2023] [Indexed: 10/13/2023]
Abstract
Tissue-specific endopolyploidy is widespread among plants and animals and its role in organ development and function has long been investigated. In insects, the fat body cells of sexually mature females produce substantial amounts of egg yolk precursor proteins (vitellogenins) and exhibit high polyploid levels, which is considered crucial for boosting egg production. Termites are social insects with a reproductive division of labor, and the fat bodies of mature termite queens exhibit higher ploidy levels than those of other females. The fat bodies of mature termite queens are known to be histologically and cytologically specialized in protein synthesis. However, the relationship between such modifications and polyploidization remains unknown. In this study, we investigated the relationship among cell type, queen maturation, and ploidy levels in the fat body of the termite Reticulitermes speratus. We first confirmed that the termite fat body consists of two types of cells, that is, adipocytes, metabolically active cells, and urocytes, urate-storing cells. Our ploidy analysis using flow cytometry has shown that the fat bodies of actively reproducing queens had more polyploid cells than those of newly emerged and pre-reproductive queens, regardless of the queen phenotype (adult or neotenic type). Using image-based analysis, we found that not urocytes, but adipocytes became polyploid during queen differentiation and subsequent sexual maturation. These results suggest that polyploidization in the termite queen fat body is associated with sexual maturation and is regulated in a cell type-specific manner. Our study findings have provided novel insights into the development of insect fat bodies and provide a basis for future studies to understand the functional importance of polyploidy in the fat bodies of termite queens.
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Affiliation(s)
- Tomonari Nozaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan.
- Laboratory of Evolutionary Genomics, National Institute for Basic Biology, Okazaki, 444-8585, Japan.
| | - Eisuke Tasaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, 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, Kyoto, 606-8502, Japan
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3
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Ono M, Matsuura K, Kono M, Ohnishi K, Takayama Y, Shoda H, Iwamoto Y, Kagemoto M. Long-Term Results of a Phase II Study of Accelerated Hyperfractionated Thoracic Radiotherapy with Dose Escalation to 54 Gy for Limited-Stage Small-Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2023; 117:e45. [PMID: 37785450 DOI: 10.1016/j.ijrobp.2023.06.747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) The combination of accelerated hyperfractionated thoracic radiotherapy (AHF-TRT) of 45 Gy and concurrent chemotherapy is the standard treatment for limited-stage small-cell lung cancer (LS-SCLC). However, the optimal dose and fractionation remain controversial. We herein report the results of a phase II study investigating the utility of dose escalation to 54 Gy on AHF-RT for LS-SCLC. MATERIALS/METHODS We enrolled patients ≤80 years old with treatment-naïve confirmed LS-SCLC and an Eastern Cooperative Oncology Group (ECOG) performance status of 0-2. The radiation dose was 54 Gy delivered in 36 fractions in 18 treatment days over 3.6 weeks. The chemotherapy regimens were PE (cisplatin and etoposide)- or CE (carboplatin and etoposide)-based. AHF-TRT was given in 2 phases: patients initially received 36 Gy to the gross tumor plus uninvolved mediastinal nodes, followed by a boost to the gross tumor of 18 Gy. All patients were treated with three-dimensional conformal radiation therapy with multiple fields to reduce the elevated dose volume to the surrounding tissues, such as the lungs and esophagus, as much as possible. All patients were evaluated for the overall survival (OS), progression-free survival (PFS), and non-hematological toxicity. RESULTS Between 2013 and 2016, a total of 13 patients were enrolled in the present study. All the patients were assessable for the response and toxicity. The median age was 67 (range, 54-78) years old, and 9 patients were male, while 4 were female. Twelve patients had a ECOG performance status of 0. The numbers of patients with Stage IIA, IIB, IIIA, and IIIB disease were one, one, eight, and three, respectively. The median follow-up for all patients was 79 (range, 13-107) months, and that for surviving patients was 90 (range, 79-107) months. The patterns of failure were locoregional-only recurrence in 0% (0 patients), both locoregional and distant in 15.4% (2 patients), and distant-only in 30.8% (4 patients). Recurrence from the elective nodal irradiation area was seen in 0% (0 patients). The 1-, 3-, 5-, and 7-year OS rates were 100%, 76.9%, 53.9%, and 44.9%, respectively, and the median OS was 83.0 months. The 1-, 3-, 5-, and 7-year PFS rates were 76.9%, 53.9%, 53.9%, and 44.9%, respectively, and the median PFS was 83.0 months. No patient experienced a grade ≥3 non-hematological adverse effect, such as esophagitis or pneumonitis, during treatment or follow-up. Grade 2 pneumonitis was observed in 2 patients (15.4%), Grade 2 esophagitis was observed in 12 patients (92.3%), and Grade 2 esophageal pain was observed in 2 patients (15.4%). CONCLUSION In this study, AHF-TRT of 54 Gy with concurrent PE- or CE-based regimens resulted in a good OS and PFS without increasing severe toxicity. Although this regimen needs to be evaluated in more patients to fully confirm its efficacy, these outcomes suggest that dose escalation to 54 Gy may be a promising radical treatment for LS-SCLC.
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Affiliation(s)
- M Ono
- Clinical training division, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan; Department of Radiation Oncology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan
| | - K Matsuura
- Department of Radiation Oncology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan
| | - M Kono
- Department of Medical Oncology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan
| | - K Ohnishi
- Department of Radiation Oncology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan
| | - Y Takayama
- Department of Respiratory Medicine, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan
| | - H Shoda
- Department of Respiratory Medicine, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan
| | - Y Iwamoto
- Department of Medical Oncology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan
| | - M Kagemoto
- Department of Radiation Oncology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan
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Ishibashi T, Waliullah ASM, Aramaki S, Kamiya M, Kahyo T, Nakamura K, Tasaki E, Takata M, Setou M, Matsuura K. Plastic brain structure changes associated with the division of labor and aging in termites. Dev Growth Differ 2023; 65:374-383. [PMID: 37357446 DOI: 10.1111/dgd.12873] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 05/29/2023] [Accepted: 06/13/2023] [Indexed: 06/27/2023]
Abstract
Division of labor is a prominent feature of social insect societies, where different castes engage in different specialized tasks. As brain differences are associated with behavioral differences, brain anatomy may be linked to caste polymorphism. Here, we show that termite brain morphology changes markedly with caste differentiation and age in the termite, Reticulitermes speratus. Brain morphology was shown to be associated with reproductive division of labor, with reproductive individuals (alates and neotenic reproductives) having larger brains than nonreproductives (workers and soldiers). Micro-computed tomography (CT) imaging and dissection observations showed that the king's brain morphology changed markedly with shrinkage of the optic lobes during their long life in the dark. Behavioral experiments showed that mature primary kings lose visual function as a result of optic lobe shrinkage. These results suggested that termites restructure their nervous systems to perform necessary tasks as they undergo caste differentiation, and that they also show flexible changes in brain morphology even after the final molt. This study showed that brain morphology in social insects is linked to caste and aging, and that the evolution of the division of labor is underpinned by the development of diverse neural systems for specialized tasks.
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Affiliation(s)
- Tomoki Ishibashi
- Laboratory of Insect Ecology, Kyoto University, Kyoto, Japan
- Laboratory for Physical Biology, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - A S M Waliullah
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, Shizuoka, Japan
| | - Shuhei Aramaki
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, Shizuoka, Japan
- International Mass Imaging Center, Hamamatsu University School of Medicine, Shizuoka, Japan
- Department of Radiology, Hamamatsu University Hospital, Shizuoka, Japan
| | - Masaki Kamiya
- Department of Radiology, Hamamatsu University Hospital, Shizuoka, Japan
| | - Tomoaki Kahyo
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, Shizuoka, Japan
- International Mass Imaging Center, Hamamatsu University School of Medicine, Shizuoka, Japan
| | | | - Eisuke Tasaki
- Laboratory of Insect Ecology, Kyoto University, Kyoto, Japan
| | - Mamoru Takata
- Laboratory of Insect Ecology, Kyoto University, Kyoto, Japan
| | - Mitsutoshi Setou
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, Shizuoka, Japan
- International Mass Imaging Center, Hamamatsu University School of Medicine, Shizuoka, Japan
- Department of Systems Molecular Anatomy, Institute for Medical Photonics Research, Preeminent Medical Photonics Education and Research Center, Hamamatsu University School of Medicine, Shizuoka, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Kyoto University, Kyoto, Japan
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5
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Takata M, Yabe K, Noro T, Mizote S, Konishi T, Tasaki E, Matsuura K. A method for estimating colony size using queen fecundity in termites under field conditions. Naturwissenschaften 2023; 110:35. [PMID: 37458826 DOI: 10.1007/s00114-023-01865-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 07/05/2023] [Accepted: 07/07/2023] [Indexed: 07/20/2023]
Abstract
Colony size in social insects is one of the most important factors in shaping their self-organized system. It affects a wide variety of traits such as foraging and defense strategies, social immune responses, the degree of polymorphism, and reproductive output. However, colony size estimation of subterranean termites in the field has been challenging, due to their extremely cryptic biology and multiple site-nesting behavior. Since natural selection favors workers that maximize the number of their siblings, the amount of egg production may reflect the number of workers in the colony. Here, we report a method for inferring colony size in the field using total egg production in each colony from a subterranean termite, Reticulitermes speratus. Our investigation of field colonies revealed that the body weight of queens reaches a peak and had the largest variance in June and July and accurately predicts the number of eggs laid by the queen per 24 h. Using laboratory-reared colonies, we found that the total egg production in each colony is proportional to the number of workers. We also estimated the colony size of 198 field colonies and found that the median and maximum colony size was 24,500 and 451,800 workers per colony. The method for inferring colony size presented here may also be applicable to termite species with a clear seasonality in egg production. The colony size estimate will contribute to understanding the life history strategies and social systems of termites.
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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.
| | - Kiyotaka Yabe
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Takuya Noro
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Shun Mizote
- 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
| | - Eisuke Tasaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
- Present address: 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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6
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Tasaki E, Mitaka Y, Takahashi Y, Waliullah ASM, Tamannaa Z, Sakamoto T, Islam A, Kamiya M, Sato T, Aramaki S, Kikushima K, Horikawa M, Nakamura K, Kahyo T, Takata M, Setou M, Matsuura K. The royal food of termites shows king and queen specificity. PNAS Nexus 2023; 2:pgad222. [PMID: 37457894 PMCID: PMC10338896 DOI: 10.1093/pnasnexus/pgad222] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 06/11/2023] [Accepted: 06/29/2023] [Indexed: 07/18/2023]
Abstract
Society in eusocial insects is based on the reproductive division of labor, with a small number of reproductive individuals supported by a large number of nonreproductive individuals. Because inclusive fitness of all colony members depends on the survival and fertility of reproductive members, sterile members provide royals with special treatment. Here, we show that termite kings and queens each receive special food of a different composition from workers. Sequential analysis of feeding processes demonstrated that workers exhibit discriminative trophallaxis, indicating their decision-making capacity in allocating food to the kings and queens. Liquid chromatography tandem-mass spectrometry analyses of the stomodeal food and midgut contents revealed king- and queen-specific compounds, including diacylglycerols and short-chain peptides. Desorption electrospray ionization mass spectrometry imaging analyses of 13C-labeled termites identified phosphatidylinositol and acetyl-l-carnitine in the royal food. Comparison of the digestive tract structure showed remarkable differences in the volume ratio of the midgut-to-hindgut among castes, indicating that digestive division of labor underlies reproductive division of labor. Our demonstration of king- and queen-specific foods in termites provides insight into the nutritional system that underpins the extraordinary reproduction and longevity of royals in eusocial insects.
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Affiliation(s)
| | | | - Yutaka Takahashi
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - A S M Waliullah
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Zinat Tamannaa
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Takumi Sakamoto
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Ariful Islam
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Masaki Kamiya
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Tomohito Sato
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Shuhei Aramaki
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
- Department of Radiology, Hamamatsu University Hospital, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
- International Mass Imaging Center, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Kenji Kikushima
- Present address: Department of Integrative Anatomy, Nagoya City University Graduate School of Medical Sciences, Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Japan
| | - Makoto Horikawa
- Present address: Hiroshima Research Center for Healthy Aging, Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - Katsumasa Nakamura
- Department of Radiology, Hamamatsu University Hospital, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Tomoaki Kahyo
- Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
- International Mass Imaging Center, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Mamoru Takata
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | | | - Kenji Matsuura
- To whom correspondence should be addressed: (M.S.); (K.M.)
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7
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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8
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Takata M, Nagai S, Inagaki T, Ohkubo Y, Tasaki E, Matsuura K. Heritable effects on caste determination and colony-level sex allocation in termites under field conditions. iScience 2023; 26:106207. [PMID: 36876124 PMCID: PMC9982680 DOI: 10.1016/j.isci.2023.106207] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 01/27/2023] [Accepted: 02/11/2023] [Indexed: 02/17/2023] Open
Abstract
The ecological success of social insects is attributed to the division of labor, where newly hatched offspring differentiate into either fertile progeny or functionally sterile worker castes. There is growing evidence for the heritable (genetic or epigenetic) effects on caste determination based on laboratory experiments. Here, we indirectly demonstrate that heritable factors have the principal role in caste determination and strongly affect colony-level production of both sexes of fertile dispersers (i.e., alates) in field colonies of the termite Reticulitermes speratus. An egg-fostering experiment suggests that the colony-dependent sex-specific caste fates were almost entirely determined before oviposition. Our investigation of field colonies revealed that such colony-dependent sex-specific caste fates result in the intercolonial variation in the numerical sex ratio of differentiated fertile offspring and, eventually, that of alates. This study contributes to better understanding the mechanisms underlying the division of labor and life-history traits in social insects.
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Affiliation(s)
- Mamoru Takata
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto Universit, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Shuya Nagai
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto Universit, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Tatsuya Inagaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto Universit, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan.,School of Life Science and Technology, Tokyo Institute of Technolog, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Yusaku Ohkubo
- Center for Data Assimilation Research and Applications, Joint Support Center for Data Science Research, Research Organization of Information and Systems, 10-3, Midori-cho, Tachikawa, Tokyo, Japan.,The Institute of Statistical Mathematics, Research Organization of Information and Systems, 10-3, Midori-cho, Tachikawa, Tokyo, Japan
| | - Eisuke Tasaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto Universit, 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 Universit, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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Yaginuma Y, Matsuura K, Yamada S, Yoshida T, Hasegawa M. Left ventricular outflow tract obstruction caused by a congenital accessory mitral valve leaflet and treated by open-heart surgery in a young dog. J Small Anim Pract 2023; 64:168-172. [PMID: 36284366 DOI: 10.1111/jsap.13571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 09/14/2022] [Accepted: 09/23/2022] [Indexed: 11/30/2022]
Abstract
A 3-month-old Shetland sheepdog presented with a loud ejection murmur and exercise intolerance. Echocardiography revealed an accessory mitral valve leaflet, characterised by a valve-like structure separate from the mitral valve seen in the subaortic region of the ventricular septum. The left ventricular outflow tract was partially obstructed with a pressure gradient of 12 mmHg. Accessory mitral valve leaflet resection and mitral valvuloplasty were performed during open-heart surgery. Histology performed on the membrane-like structures were indicative of fibrous connective tissues. Postoperative echocardiography confirmed removal of the valve-like structure with resolution of the left ventricular outflow tract obstruction. The pressure gradient was decreased to 4.6 mmHg. The dog was in good condition and no further treatment was required 5 months after surgery. Both cardiac troponin I and NT-proBNP were markedly decreased. In this dog, surgical resection combined with mitral valve plasty resolved the left ventricular outflow tract obstruction and the clinical signs.
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Affiliation(s)
- Y Yaginuma
- VCA Japan Shiraishi Animal Hospital, Saitama, Japan
| | - K Matsuura
- VCA Japan Shiraishi Animal Hospital, Saitama, Japan
| | - S Yamada
- VCA Japan Shiraishi Animal Hospital, Saitama, Japan
| | - T Yoshida
- VCA Japan Shiraishi Animal Hospital, Saitama, Japan
| | - M Hasegawa
- VCA Japan Shiraishi Animal Hospital, Saitama, Japan
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Konishi T, Tasaki E, Takata M, Matsuura K. King- and queen-specific degradation of uric acid contributes to reproduction in termites. Proc Biol Sci 2023; 290:20221942. [PMID: 36598016 PMCID: PMC9811635 DOI: 10.1098/rspb.2022.1942] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 11/24/2022] [Indexed: 01/05/2023] Open
Abstract
Caste-based reproductive division of labour in social insects is built on asymmetries in resource allocation within colonies. Kings and queens dominantly consume limited resources for reproduction, while non-reproductive castes such as workers and soldiers help reproductive castes. Studying the regulation of such asymmetries in resource allocation is crucial for understanding the maintenance of sociality in insects, although the molecular background is poorly understood. We focused on uric acid, which is reserved and used as a valuable nitrogen source in wood-eating termites. We found that king- and queen-specific degradation of uric acid contributes to reproduction in the subterranean termite Reticulitermes speratus. The urate oxidase gene (RsUAOX), which catalyses the first step of nitrogen recycling from stored uric acid, was highly expressed in mature kings and queens, and upregulated with differentiation into neotenic kings/queens. Suppression of uric acid degradation decreased the number of eggs laid per queen. Uric acid was shown to be provided by workers to reproductive castes. Our results suggest that the capacity to use nitrogen, which is essential for the protein synthesis required for reproduction, maintains colony cohesion expressed as the reproductive monopoly held by kings and queens.
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Affiliation(s)
- Takao Konishi
- 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
| | - Mamoru Takata
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, 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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11
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Komagata Y, Fukasawa Y, Matsuura K. Low temperature enhances the ability of the termite-egg-mimicking fungus Athelia termitophila to compete against wood-decaying fungi. FUNGAL ECOL 2022. [DOI: 10.1016/j.funeco.2022.101178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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12
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Lee CC, Hsu HW, Lin CY, Gustafson N, Matsuura K, Lee CY, Yang CCS. First Polycipivirus and Unmapped RNA Virus Diversity in the Yellow Crazy Ant, Anoplolepis gracilipes. Viruses 2022; 14:v14102161. [PMID: 36298716 PMCID: PMC9612232 DOI: 10.3390/v14102161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 09/26/2022] [Accepted: 09/27/2022] [Indexed: 12/01/2022] Open
Abstract
The yellow crazy ant, Anoplolepis gracilipes is a widespread invasive ant that poses significant threats to local biodiversity. Yet, compared to other global invasive ant species such as the red imported fire ant (Solenopsis invicta) or the Argentine ant (Linepithema humile), little is known about the diversity of RNA viruses in the yellow crazy ant. In the current study, we generated a transcriptomic database for A. gracilipes using a high throughput sequencing approach to identify new RNA viruses and characterize their genomes. Four virus species assigned to Dicistroviridae, two to Iflaviridae, one to Polycipiviridae, and two unclassified Riboviria viruses were identified. Detailed genomic characterization was carried out on the polycipivirus and revealed that this virus comprises 11,644 nucleotides with six open reading frames. Phylogenetic analysis and pairwise amino acid identity comparison classified this virus into the genus Sopolycivirus under Polycipiviridae, which is tentatively named "Anoplolepis gracilipes virus 3 (AgrV-3)". Evolutionary analysis showed that AgrV-3 possesses a high level of genetic diversity and elevated mutation rate, combined with the common presence of multiple viral strains within single worker individuals, suggesting AgrV-3 likely evolves following the quasispecies model. A subsequent field survey placed the viral pathogen "hotspot" of A. gracilipes in the Southeast Asian region, a pattern consistent with the region being recognized as part of the ant's native range. Lastly, infection of multiple virus species seems prevalent across field colonies and may have been linked to the ant's social organization.
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Affiliation(s)
- Chih-Chi Lee
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 6068502, Japan
- Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto 6110011, Japan
- Department of Evolutionary and Environmental Biology, Institute of Evolution, University of Haifa, Haifa 3498838, Israel
| | - Hung-Wei Hsu
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 6068502, Japan
- Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto 6110011, Japan
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan
| | - Chun-Yi Lin
- Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto 6110011, Japan
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL 33850, USA
| | - Nicolas Gustafson
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 6068502, Japan
| | - Chow-Yang Lee
- Department of Entomology, University of California, 900 University Avenue, Riverside, CA 92521, USA
| | - Chin-Cheng Scotty Yang
- Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
- Correspondence: ; Tel.: +1-540-231-3052
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Tsukahara Y, Tomonaga N, Tomonaga S, Kumagai H, Hirooka H, Matsuura K. PSVIII-B-16 Potential of Termites as a Protein Source for Chickens. J Anim Sci 2022. [DOI: 10.1093/jas/skac247.564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Termite (Hodotermopsis sjostedti) meal was evaluated as a potential protein alternative for chicken feed. After chemical compositions, mineral and vitamin contents, and amino acid concentrations of termite meal were analyzed, 20-layer male chickens (8 d old and 78±0.9 g initial BW) were allocated into individual pens and randomly assigned one of the 4 diet treatments; a commercial diet (CON) and inclusion of freeze-dried ground termite meal of 3.3%, 6.7%, and 10.0% to monitor growth and feed intake. At 11 d old, chickens were slaughtered and meat and liver weight and blood plasma parameters were measured. Termite meal composited 61.5, 15.0, 7.8, and 4.9% of CP, crude fat, crude fiber, and ash, respectively. Mineral contents were 1.58, 8.25, 4.38, 13.1, 1.49, and 2.18 g/kg for Na, P, Ca, K, Mg, Cl, respectively, and 321, 108, and 0.38 mg/kg for Fe, Cu, and Se, respectively. Amino acid concentrations were 2.76, 1.35, 2.11, 3.52, 3.03, 0.72, 1.99, 2.20, 2.88, 3.70, 4.18, 0.50, 6.10, 3.25, 2.75, 2.30, 0.57, and 3.52% for arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, valine, alanine, aspartic acid, cystine, glutamic acid, glycine, proline, serine, tryptophan, and tyrosine. There were quadratic effects on final BW (P=0.09; 109, 110, 113, and 110 g for CON, 3.3%, 6.7%, and 10.0%, respectively; SE=1.42), ADG (P=0.09; 10.1, 10.7, 11.6, and 10.4 g for CON, 3.3%, 6.7%, and 10.0%, respectively; SE=0.47), intake (P=0.02; 23, 21, 24, and 20 g for CON, 3.3%, 6.7%, and 10.0%, respectively; SE=1.16), and plasma Ca concentration (P=0.02; 10.1, 10.5, 10.0, and 10.3 mg/dL for CON, 3.3%, 6.7%, and 10.0%, respectively; SE=0.13), whereas main effects of the treatment for all the items tested were not detected (P>0.05). In conclusion, termite meal can be used as an alternative protein source for chicken feed but could have an adverse effect at 10% inclusion.
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Tsukahara Y, Tomonaga N, Tomonaga S, Kumagai H, Hirooka H, Matsuura K. PSXIII-B-10 Effects of Termite (Hodotermopsis Sjostedti) Meal Supplement in Broiler Chicken Diets on Growth and Intake. J Anim Sci 2022. [DOI: 10.1093/jas/skac247.598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Effects of partial replacement of fishmeal with termite (Hodotermopsis sjostedti) meal in chicken diets on BW, ADG, intake, and organ and meat weight were tested with Chunky broiler female chickens in two experiments. In Exp.1, 20 chickens (8 d of age and 239 ± 3.0 g BW initially) were allocated in individual pens and assigned one of the four diet treatments; commercial diet with fishmeal supplement (0.0%) and replacement of fishmeal with freeze-dried ground termite meal of 0.5%, 2.5%, and 5.0%. In Exp.2, 18 chickens (9 d of age and 309 ± 3.8 g BW initially) were assigned one of the three diet treatments; commercial diet (COM), 2.5% fishmeal supplement (FM), and 2.5% termite meal supplement (TM). At 21 d old, chickens were slaughtered, and meat and organ weight were measured. Treatment diet CP concentrations resulted in 29.7 and 27.9% DM for Exp.1 and Exp.2, respectively. There was no treatment effect (P>0.05) on BW, ADG, intake, feed conversion rate, meat (i.e., thigh, breast fillet, and inner breast fillet) weights, or organ (i.e., liver, heart, spleen, gizzard, proventriculus, and intestine) weight in both experiments. In Exp.1, empty cecum weight was greater (P=0.03) when termite meal was not included (0.37, 0.33, 0.31, and 0.31 % per shrunk BW for 0.0%, 0.5%, 2.5%, and 5.0%, respectively; SE=0.022). Similarly, whole cecum weight (0.38, 0.54, and 0.40 % per shrunk BW for COM, FM, and TM, respectively; SE=0.043) and cecum fill (0.08, 0.21, and 0.09 % per shrunk BW for COM, FM, and TM, respectively; SE=0.037) were greater (P=0.05) for FM than COM and TM in Exp.2. In conclusion, termite meal supplements did not have either favorable or adverse effects on the growth or weight of meat and organs except cecum weight. Further investigation is needed for cecum function and meat quality.
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Maekura K, Yamano R, Matsuura K, Kadoyama K, Matsuyama S, Hamada M, Takano M. Proteomic analysis of the heart in normal aging mice. J Med Invest 2022; 69:217-223. [PMID: 36244772 DOI: 10.2152/jmi.69.217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Aging induces pathological cardiovascular changes such as cardiac dysfunction and arteriosclerosis. With aging, heart cells, especially, become more susceptible to lethal damage. In this report, we tried to understand the precise mechanism of myocardial change resulting from aging by examining the heart proteome in aging mice using two-dimensional gel electrophoresis (2DE). The proteins were stained with fluorescence dyes (SYPRO Ruby and Pro-Q Diamond) and identified by subsequent MALDI-TOF-MS / MS. As a result, markedly altered levels of 14 proteins and 7 phosphoproteins were detected in the hearts of 3-, 7-, 11-, and 20-month-old mice. The functions of these identified proteins and phosphoproteins were energy metabolism, muscle contraction, glycolysis, and cytoskeletal support. Additionally, the results of Western blotting confirmed changes in the expression of FTH, CPNE5, and SUCLA2. These findings showed that aging modified the expression of proteins and phosphoproteins in the heart. We suggest that changes in the expression of these proteins are critical to the development of cardiac dysfunction resulting from aging. J. Med. Invest. 69 : 217-223, August, 2022.
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Affiliation(s)
- Koji Maekura
- Laboratory of Molecular Cellular Biology, School of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan
| | - Ryo Yamano
- Laboratory of Molecular Cellular Biology, School of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan
| | - Kenji Matsuura
- Laboratory of Toxicology, Faculty of Pharmacy, Osaka Ohtani University, 3-11-1 Nishikigorikita, Tondabayashi, Osaka 584-8540, Japan
| | - Keiichi Kadoyama
- Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, 7-2-1 Kamiohno, Himeji 670-8524, Japan
| | - Shogo Matsuyama
- Biosignal Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Michiko Hamada
- Laboratory of Molecular Cellular Biology, School of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan
| | - Masaoki Takano
- Laboratory of Molecular Cellular Biology, School of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan
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Yashiro T, Tea YK, Van Der Wal C, Nozaki T, Mizumoto N, Hellemans S, Matsuura K, Lo N. Enhanced heterozygosity from male meiotic chromosome chains is superseded by hybrid female asexuality in termites. Proc Natl Acad Sci U S A 2021; 118:e2009533118. [PMID: 34903643 PMCID: PMC8713478 DOI: 10.1073/pnas.2009533118] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/02/2021] [Indexed: 11/18/2022] Open
Abstract
Although males are a ubiquitous feature of animals, they have been lost repeatedly in diverse lineages. The tendency for obligate asexuality to evolve is thought to be reduced in animals whose males play a critical role beyond the contribution of gametes, for example, via care of offspring or provision of nuptial gifts. To our knowledge, the evolution of obligate asexuality in such species is unknown. In some species that undergo frequent inbreeding, males are hypothesized to play a key role in maintaining genetic heterozygosity through the possession of neo-sex chromosomes, although empirical evidence for this is lacking. Because inbreeding is a key feature of the life cycle of termites, we investigated the potential role of males in promoting heterozygosity within populations through karyotyping and genome-wide single-nucleotide polymorphism analyses of the drywood termite Glyptotermes nakajimai We showed that males possess up to 15 out of 17 of their chromosomes as sex-linked (sex and neo-sex) chromosomes and that they maintain significantly higher levels of heterozygosity than do females. Furthermore, we showed that two obligately asexual lineages of this species-representing the only known all-female termite populations-arose independently via intraspecific hybridization between sexual lineages with differing diploid chromosome numbers. Importantly, these asexual females have markedly higher heterozygosity than their conspecific males and appear to have replaced the sexual lineages in some populations. Our results indicate that asexuality has enabled females to supplant a key role of males.
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Affiliation(s)
- Toshihisa Yashiro
- School of Life and Environmental Sciences, University of Sydney, Sydney NSW 2006, Australia;
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Yi-Kai Tea
- School of Life and Environmental Sciences, University of Sydney, Sydney NSW 2006, Australia
- Ichthyology, Australian Museum Research Institute, Sydney, NSW 2010, Australia
| | - Cara Van Der Wal
- School of Life and Environmental Sciences, University of Sydney, Sydney NSW 2006, Australia
| | - Tomonari Nozaki
- Laboratory of Evolutionary Genomics, National Institute for Basic Biology, Okazaki 444-8585, Japan
| | - Nobuaki Mizumoto
- Evolutionary Genomics Unit, Okinawa Institute of Science and Technology Graduate University, Onna-son 904-0495, Japan
| | - Simon Hellemans
- Evolutionary Genomics Unit, Okinawa Institute of Science and Technology Graduate University, Onna-son 904-0495, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Nathan Lo
- School of Life and Environmental Sciences, University of Sydney, Sydney NSW 2006, Australia;
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Kamiyama MT, Matsuura K, Yoshimura T, Yang CCS. Improving invasive species management using predictive phenology models: an example from brown marmorated stink bug (Halyomorpha halys) in Japan. Pest Manag Sci 2021; 77:5489-5497. [PMID: 34363432 DOI: 10.1002/ps.6589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 08/01/2021] [Accepted: 08/07/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND In order to better understand the population dynamics of invasive species in their native range, we developed two predictive phenological models using the ubiquitous invasive insect pest, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), as the model organism. Our work establishes a zero-inflated negative binomial regression (ZINB) model, and a general additive mixed model (GAMM) based on 11 years of black light trap monitoring of H. halys at three locations in Japan. RESULTS The ZINB model indicated that degree days (DD) have a significant effect on the trap catch of adult H. halys, and that precipitation has no effect. A dataset generated by 1000 simulations from the ZINB suggested that higher predicted trap catches equated to a lower probability of encountering a zero-count. The GAMM produced a cubic regression smooth curve which forecasts the seasonal phenology of H. halys as following a bell-shaped trend in Japan. Critical DD points during the field season in Japan included 261 DD for first H. halys adult detection and 1091 DD for peak activity. CONCLUSIONS This study establishes the first models capable of forecasting native H. halys population dynamics based on DD. These robust models practically improve population forecasting of H. halys in the future and help fill gaps in knowledge pertaining to its native phenology, thus ultimately contributing to the progression of efficient management of this globally invasive species. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Matthew T Kamiyama
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
- Research Institute of Sustainable Humanosphere, Kyoto University, Kyoto, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Tsuyoshi Yoshimura
- Research Institute of Sustainable Humanosphere, Kyoto University, Kyoto, Japan
| | - Chin-Cheng Scotty Yang
- Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
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Tamaki C, Takata M, Matsuura K. The lose-to-win strategy of the weak: intraspecific parasitism via egg abduction in a termite. Biol Lett 2021; 17:20210540. [PMID: 34932926 PMCID: PMC8692029 DOI: 10.1098/rsbl.2021.0540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Accepted: 11/30/2021] [Indexed: 12/24/2022] Open
Abstract
Predation by larger conspecifics poses a major threat to small juveniles in many animal species. However, in social insects, raids perpetrated by large colonies may provide smaller colonies with opportunities for parasitization. Herein, in the termite Reticulitermes speratus, we demonstrate that small incipient colonies parasitize large mature colonies through egg abduction when attacked by raiding conspecifics. We observed that the eggs of incipient colonies were brought into raiding colonies while their parents were killed during the attack. In this species, unmated females found new colonies with female-female (FF) cooperation, in addition to the typical monogamous colony foundation. Interestingly, the abducted eggs of FF pairs developed into nymphs (reproductive caste) in the raiding colonies, whereas the eggs of male-female (MF) pairs developed into workers (non-reproductive caste). Parthenogenetic eggs are known to be developmentally predisposed to becoming female reproductives owing to genomic imprinting in termites. This study demonstrates that the plundering of small colonies by larger conspecific colonies not only results in the extinction of the weaker colonies, but also serves as a strategy that incipient colonies use to obtain the reproductive position in large colonies by stealth. The results elucidate the diversity and complexity of inter-colonial interactions in social insects.
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Affiliation(s)
- Chihiro Tamaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
| | - Mamoru Takata
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
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Kuwayama T, Matsuura K, Gouchi J, Yamakawa Y, Mizukami Y, Kasahara S, Matsuda Y, Shibauchi T, Kontani H, Uwatoko Y, Fujiwara N. Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe. Sci Rep 2021; 11:17265. [PMID: 34446750 PMCID: PMC8390510 DOI: 10.1038/s41598-021-96277-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 08/04/2021] [Indexed: 11/19/2022] Open
Abstract
FeSe is a unique high-\documentclass[12pt]{minimal}
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\begin{document}$$T_c$$\end{document}Tc iron-based superconductor in which nematicity, superconductivity, and magnetism are entangled with each other in the P-T phase diagram. We performed \documentclass[12pt]{minimal}
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\begin{document}$$^{77}$$\end{document}77Se-nuclear magnetic resonance measurements under pressures of up to 3.9 GPa on 12% S-substituted FeSe, in which the complex overlap between the nematicity and magnetism are resolved. A pressure-induced Lifshitz transition was observed at 1.0 GPa as an anomaly of the density of states and as double superconducting (SC) domes accompanied by different types of antiferromagnetic (AF) fluctuations. The low-\documentclass[12pt]{minimal}
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\begin{document}$$T_{\mathrm{c}}$$\end{document}Tc SC dome below 1 GPa is accompanied by strong AF fluctuations, whereas the high-\documentclass[12pt]{minimal}
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\begin{document}$$T_{\mathrm{c}}$$\end{document}Tc SC dome develops above 1 GPa, where AF fluctuations are fairly weak. These results suggest the importance of the \documentclass[12pt]{minimal}
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\begin{document}$$d_{xy}$$\end{document}dxy orbital and its intra-orbital coupling for the high-\documentclass[12pt]{minimal}
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\begin{document}$$T_{\mathrm{c}}$$\end{document}Tc superconductivity.
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Affiliation(s)
- T Kuwayama
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cyo, Sakyo-ku, Kyoto, 606-8501, Japan
| | - K Matsuura
- Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan.,Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8904, Japan
| | - J Gouchi
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - Y Yamakawa
- Department of Physics, Nagoya University, Furo-cho, Nagoya, 464-8602, Japan
| | - Y Mizukami
- Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - S Kasahara
- Division of Physics and Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.,Department of Physics, Okayama University, Okayama, 700-8530, Japan
| | - Y Matsuda
- Division of Physics and Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - T Shibauchi
- Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - H Kontani
- Department of Physics, Nagoya University, Furo-cho, Nagoya, 464-8602, Japan
| | - Y Uwatoko
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - N Fujiwara
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cyo, Sakyo-ku, Kyoto, 606-8501, Japan.
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Fujisawa T, Motegi A, Zenda S, Hojo H, Nakamura M, Hirano Y, Hirata H, Vijay Parshuram R, Matsuura K, Shinozaki T, Hayashi R, Akimoto T. PO-1007 Radiotherapy with delayed accelerated hyperfractionated boost for node negative hypopharynx cancer. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07458-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Takeuchi A, Uemura A, Goya S, Shimada K, Yoshida T, Hara S, Sato K, Shiraishi K, Yairo A, Kto K, Matsuura K, Tanaka R. The utility of patent ductus arteriosus closure with hemostatic clip in dogs. Pol J Vet Sci 2021; 23:255-260. [PMID: 32627978 DOI: 10.24425/pjvs.2020.133640] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This study investigated the utility of patent ductus arteriosus (PDA) closure with hemostatic clip by comparing with traditional PDA closure. Medical records of 51 dogs with surgical closure of PDA were reviewed and retrospective study was conducted. 29 dogs were treated by procedure with hemostatic clip (Group HC), and 22 dogs were treated by surgical ligation (Group SL). Data pertaining to breed, sex, age and body weight at the time of surgery, echocardiographic minimal ductal diameter, duration of surgery, hemostatic clip size, echocardiographic findings, hemor-rhage, residual ductal flow and recanalization were collected from records. The results showed that procedure with hemostatic clip had been selected in lighter dogs than traditional PDA closure. Duration of surgery performed only hemostatic clip technique was significantly shorter than that in group SL. Preoperative LVIDd, E-wave and FS were significantly lower than postoperative ones. As regard all parameters, the differences between pre- and postoperative periods were not significantly different between group HC and group SL. Hemorrhage, residual ductal flow, and recanalization were not significantly different in both groups. The present study showed that procedure with hemostatic clip is beneficial in that it is available in smaller dogs and can make shorter operation duration than traditional PDA closure. Moreover, the procedure is effective for the resolution of volume overload of the left atrium and ventricle in short-term outcome. Complications including hemorrhage, residual ductal flow and recanaliza-tion were not significantly different with both techniques.
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Affiliation(s)
- A Takeuchi
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - A Uemura
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan
| | - S Goya
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - K Shimada
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - T Yoshida
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - S Hara
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - K Sato
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - K Shiraishi
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - A Yairo
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - K Kto
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - K Matsuura
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
| | - R Tanaka
- Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo, 183-8509, Japan
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Nozaki T, Matsuura K. Oocyte resorption in termite queens: Seasonal dynamics and controlling factors. J Insect Physiol 2021; 131:104242. [PMID: 33845091 DOI: 10.1016/j.jinsphys.2021.104242] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/17/2021] [Accepted: 04/05/2021] [Indexed: 06/12/2023]
Abstract
Female insects can resorb their oocytes that could not be oviposited. Oocyte resorption is proposed to be an adaptive mechanism to optimize fitness in hostile environments, recouping resources that might otherwise be lost. Social insects have developed reproductive division of labor, wherein a small number of queens are devoted to egg production. Matured queens are highly specialized in reproduction and are largely dependent on nestmate workers for their nourishment. Therefore, oocyte resorption in the queens should be influenced by social factors such as the amount of available workforce, as well as external and abiotic factors. In this study, we investigated the seasonal dynamics and regulation factors of oocyte resorption in actively reproducing termite queens. We continuously collected the field-nests of the subterranean termite Reticulitermes speratus and demonstrated that queens frequently resorbed their oocytes in late summer, even though it is one of the most productive seasons in this species. On the other hand, our laboratory experiment showed that oocyte resorption itself was strongly induced regardless of the season. We also found that the rate of oocyte resorption was influenced by colony size (the number of attending workers). These results suggest that termite queens seasonally resorb their oocytes, yet oocyte resorption itself is regulated by social factors rather than by seasonal factors. Our study provides a unique insight into the regulation of reproduction in social insects.
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Affiliation(s)
- Tomonari Nozaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan; Laboratory of Evolutionary Genomics, National Institute for Basic Biology, Okazaki, Japan.
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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Abstract
Lifespan varies greatly across the tree of life. Of the various explanations for this phenomenon, those that involve trade-offs between reproduction and longevity have gained considerable support. There is an important exception: social insect reproductives (queens and in termites, also kings) exhibit both high reproductive outputs and extraordinarily long lives. As both the ultimate and proximate mechanisms underlying the absence of the fecundity/longevity trade-off could shed light on the unexpected dynamics and molecular mechanisms of extended longevity, reproductives of social insects have attracted much attention in the field of ageing research. Here, we highlight current ecological and physiological studies on ageing and discuss the various possible evolutionary and molecular explanations of the extended lifespans of termite reproductives. We integrate these findings into a coherent framework revealing the evolution of longevity in these reproductives. Studies on termites may explain why and how ageing is shaped by natural selection. This article is part of the theme issue 'Ageing and sociality: why, when and how does sociality change ageing patterns?'
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Affiliation(s)
- Eisuke Tasaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Mamoru Takata
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
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Maekawa N, Yokoi H, Sotome K, Matsuura K, Tanaka C, Endo N, Nakagiri A, Ushijima S. Athelia termitophila sp. nov. is the teleomorph of the termite ball fungus Fibularhizoctonia sp. MYCOSCIENCE 2020. [DOI: 10.1016/j.myc.2020.08.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Lee CC, Lin CY, Tseng SP, Matsuura K, Yang CCS. Ongoing Coevolution of Wolbachia and a Widespread Invasive Ant, Anoplolepis gracilipes. Microorganisms 2020; 8:E1569. [PMID: 33053771 PMCID: PMC7601630 DOI: 10.3390/microorganisms8101569] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 10/07/2020] [Accepted: 10/08/2020] [Indexed: 01/25/2023] Open
Abstract
While Wolbachia are commonly found among arthropods, intraspecific infection rates can vary substantially across the geographic populations. Here we report nearly 100% prevalence of Wolbachia in the global populations of the yellow crazy ant, Anoplolepis gracilipes. To understand coevolutionary history between Wolbachia and A. gracilipes, we identified single nucleotide polymorphisms (SNPs) in Wolbachia from the ant across 12 geographical regions and compared the phylogeny of SNP-based Wolbachia to patterns of the ant's mitochondrial DNA (mtDNA) variation. Our results revealed a strong concordance between phylogenies of Wolbachia and host mtDNA, providing immediate evidence of co-divergence. Among eight identified SNP loci separating the genetic clusters of Wolbachia, seven loci are located in potential protein-coding genes, three of which being non-synonymous SNPs that may influence gene functions. We found a Wolbachia hypothetical protein gene with signature of positive selection. These findings jointly allow us to characterize Wolbachia-ant coevolution and also raise a question about mechanism(s) underlying maintenance of high prevalence of Wolbachia during the colonization of this invasive ant.
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Affiliation(s)
- Chih-Chi Lee
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan;
- Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto 611-0011, Japan;
| | - Chun-Yi Lin
- Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto 611-0011, Japan;
| | - Shu-Ping Tseng
- Department of Entomology, University of California, 900 University Avenue, Riverside, CA 92521, USA;
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan;
| | - Chin-Cheng Scotty Yang
- Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto 611-0011, Japan;
- Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
- Department of Entomology, National Chung Hsing University, Taichung 402204, Taiwan
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26
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Eguchi A, Yoneoka D, Shi S, Tanoue Y, Kawashima T, Nomura S, Matsuura K, Makiyama K, Ejima K, Gilmour S, Nishiura H, Miyata H. Trend change of the transmission route of COVID-19-related symptoms in Japan. Public Health 2020; 187:157-160. [PMID: 32980782 PMCID: PMC7455197 DOI: 10.1016/j.puhe.2020.08.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/08/2020] [Accepted: 08/20/2020] [Indexed: 11/02/2022]
Abstract
OBJECTIVES The Japanese prime minister declared a state of emergency on April 7 2020 to combat the outbreak of coronavirus disease 2019 (COVID-19). This declaration was unique in the sense that it was essentially driven by the voluntary restraint of the residents. We examined the change of the infection route by investigating contact experiences with COVID-19-positive cases. STUDY DESIGN This study is a population-level questionnaire-based study using a social networking service (SNS). METHODS To assess the impact of the declaration, this study used population-level questionnaire data collected from an SNS with 121,375 respondents (between March 27 and May 5) to assess the change in transmission routes over the study period, which was measured by investigating the association between COVID-19-related symptoms and (self-reported) contact with COVID-19-infected individuals. RESULTS The results of this study show that the declaration prevented infections in the workplace, but increased domestic infections as people stayed at home. However, after April 24, workplace infections started to increase again, driven by the increase in community-acquired infections. CONCLUSIONS While careful interpretation is necessary because our data are self-reported from voluntary SNS users, these findings indicate the impact of the declaration on the change in transmission routes of COVID-19 over time in Japan.
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Affiliation(s)
- A Eguchi
- Department of Sustainable Health Science, Center for Preventive Medical Sciences, Chiba University, Chiba, Japan
| | - D Yoneoka
- Department of Health Policy and Management, School of Medicine, Keio University, Tokyo, Japan; Graduate School of Public Health, St. Luke's International University, Tokyo, Japan; Department of Global Health Policy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - S Shi
- Department of Systems Pharmacology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; Laboratory for Synthetic Biology, RIKEN Center for Biosystems Dynamics Research, Osaka, Japan
| | - Y Tanoue
- Institute for Business and Finance, Waseda University, Tokyo, Japan
| | - T Kawashima
- Department of Mathematical and Computing Science, Tokyo Institute of Technology, Tokyo, Japan
| | - S Nomura
- Department of Health Policy and Management, School of Medicine, Keio University, Tokyo, Japan; Department of Global Health Policy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - K Matsuura
- Department of Management Science, Graduate School of Engineering, Tokyo University of Science, Tokyo, Japan; HOXO-M Inc., Tokyo, Japan
| | - K Makiyama
- HOXO-M Inc., Tokyo, Japan; Yahoo Japan Corporation, Tokyo, Japan
| | - K Ejima
- Department of Epidemiology and Biostatistics, Indiana University School of Public Health-Bloomington, Bloomington, USA
| | - S Gilmour
- Department of Global Health Policy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - H Nishiura
- Graduate School of Medicine, Hokkaido University, Hokkaido, Japan
| | - H Miyata
- Department of Health Policy and Management, School of Medicine, Keio University, Tokyo, Japan.
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Mitaka Y, Matsuura K. Age-Dependent Increase in Soldier Pheromone of the Termite Reticulitermes speratus. J Chem Ecol 2020; 46:483-489. [PMID: 32440722 DOI: 10.1007/s10886-020-01182-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 05/05/2020] [Accepted: 05/13/2020] [Indexed: 11/28/2022]
Abstract
Pheromone communication helps maintaining the sophisticated colony organization in social insects. In the termite Reticulitermes speratus, there are two functionally distinct soldier groups: royal guards and entrance guards. Royal guards protect kings and queens in the innermost part of the nest, whereas entrance guards prevent predators from intruding into the nest at the periphery. A recent study revealed that younger and older soldiers work as royal and entrance guards, respectively. This age-dependent distribution is thought to help workers to recognize where in the nest they are located. However, it is not known whether workers can discriminate the age of soldiers. Here, we show that the abundance of soldier pheromone changes with age and that workers discriminate a soldier's age by recognizing the pheromone abundance. Gas chromatography-mass spectrometry analysis revealed that the chemical profiles of extracts in three soldier groups of different ages (newly differentiated, royal guard, and entrance guard soldiers) are markedly different. Entrance guard soldiers have the most soldier pheromone among the three age classes. Furthermore, our bioassays suggested that the worker's movement from chamber to chamber is inhibited only when a soldier with less soldier pheromone is located at the chamber entrance. These results suggest that the soldier pheromone functions as a soldier age indicator and that workers change their behavior depending on the age of the soldier defending the chamber entrance. This study contributes to our understanding of the relationship between aging and pheromone communication in social insects.
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Affiliation(s)
- Yuki Mitaka
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan. .,Applied Entomology Laboratory, Department of Bioresource Field Science, Kyoto Institute of Technology, 1 Saga-Ippongi-cho, Ukyo-ku, Kyoto, 616-8354, 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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28
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Kadoyama K, Matsuura K, Takano M, Otani M, Tomiyama T, Mori H, Matsuyama S. Proteomic analysis involved with synaptic plasticity improvement by GABA A receptor blockade in hippocampus of a mouse model of Alzheimer's disease. Neurosci Res 2020; 165:61-68. [PMID: 32348793 DOI: 10.1016/j.neures.2020.04.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 04/03/2020] [Accepted: 04/15/2020] [Indexed: 12/31/2022]
Abstract
GABAergic system plays a part in synaptic plasticity in the hippocampus. We had reported a long-term potentiation (LTP)-like facilitation in vivo, known as synaptic plasticity, through GABAA receptor blockade by bicuculline and the expression of proteins involved with this synaptic plasticity in mouse hippocampus. In the present study, we aimed to show improvement of impaired synaptic plasticity through GABAA receptor blockade and to clarify the molecular mechanisms involved with this improvement in the hippocampus of mice overexpressing human amyloid precursor protein with the E693Δ mutation (APPOSK-Tg) as an Alzheimer's disease model showing impaired synaptic plasticity. Electrophysiological study showed that the LTP-like facilitation expressed with application of bicuculline in vivo was significantly greater than impaired tetanic LTP in APPOSK-Tg mice, which was improved by bicuculline. Proteomic analysis showed that the expression of 11 proteins in the hippocampus was significantly changed 8 h after bicuculline application to APPOSK-Tg mice. The identified proteins could be functionally classified as chaperone, cytoskeletal protein, energy metabolism, metabolism, neuronal development, and synaptic component. Additionally, western blotting validated the changes in four proteins. We therefore propose that the improvement of impaired synaptic plasticity through GABAA receptor blockade could be mediated by the changed expression of these proteins.
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Affiliation(s)
- Keiichi Kadoyama
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Himeji 670-8524, Japan
| | - Kenji Matsuura
- Faculty of Pharmacy, Osaka-Ohtani University, Tondabayashi 584-8540, Japan
| | - Masaoki Takano
- Department of Life Sciences Pharmacy, School of Pharmaceutical Sciences, Kobe Gakuin University, Kobe 650-8586, Japan
| | - Mieko Otani
- Department of Life Sciences Pharmacy, School of Pharmaceutical Sciences, Kobe Gakuin University, Kobe 650-8586, Japan
| | - Takami Tomiyama
- Department of Translational Neuroscience, Osaka City University Graduate School of Medicine, Osaka 545-8585, Japan
| | - Hiroshi Mori
- Department of Clinical Neuroscience, Osaka City University Medical School, Osaka 545-8585, Japan
| | - Shogo Matsuyama
- Biosignal Research Center, Kobe University, Kobe 657-8501, Japan.
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29
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Tasaki E, Komagata Y, Inagaki T, Matsuura K. Reproduction deep inside wood: a low O 2 and high CO 2 environment promotes egg production by termite queens. Biol Lett 2020; 16:20200049. [PMID: 32264784 DOI: 10.1098/rsbl.2020.0049] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Extreme conditions are normal for animals living in harsh environments. These animals adapt to their habitats and can use difficult conditions by default. Organisms living in enclosed spaces, notably termites in decaying wood, experience low O2 and high CO2 gas conditions due to limited gas exchange and high insect density. Termite queens, in particular, reproduce in royal chambers deep inside the wood, wherein tens of thousands of individuals engage in social labour. Here, we demonstrate that royal chambers in termite nests have low O2 and high CO2 gas concentrations, which enhance egg production by queens. We identified a unique gas condition of royal chambers in the nest of the subterranean termite Reticulitermes speratus, which is characterized by low O2 (15.75%) and high CO2 (4.99%) concentrations. Queens showed significantly greater fecundity under the low O2 and high CO2 gas conditions in the royal chambers than under ambient gas conditions. Quantitative PCR analysis revealed that the royal chamber gas conditions significantly promoted the expression levels of the vitellogenin genes RsVg1, RsVg2 and RsVg3 in queens compared with ambient gas conditions. This study highlights the adaptation of animals that live in closed habitats, which are hypoxic and hypercapnic as the result of their own metabolism, so as to have a high fitness in such environmental conditions.
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Affiliation(s)
- Eisuke Tasaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
| | - Yasuyuki Komagata
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
| | - Tatsuya Inagaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
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30
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Mitaka Y, Tasaki E, Nozaki T, Fuchikawa T, Kobayashi K, Matsuura K. Transcriptomic analysis of epigenetic modification genes in the termite Reticulitermes speratus. Insect Sci 2020; 27:202-211. [PMID: 30203565 DOI: 10.1111/1744-7917.12640] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 08/17/2018] [Accepted: 08/29/2018] [Indexed: 06/08/2023]
Abstract
Eusocial insects display a caste system in which different castes are morphologically and physiologically specialized for different tasks. Recent studies have revealed that epigenetic modifications, including DNA methylation and histone modification, mediate caste determination and differentiation, longevity, and polyethism in eusocial insects. Although there has been a growing interest in the relationship between epigenetic mechanisms and phenotypic plasticity in termites, there is little information about differential expression levels among castes and expression sites for these genes in termites. Here we show royal-tissue-specific expression of epigenetic modification genes in the termite Reticulitermes speratus. Using RNA-seq, we identified 74 genes, including three DNA methyltransferases, seven sirtuins, 48 Trithorax group proteins, and 16 Polycomb group proteins. Among these genes, 15 showed king-specific expression, and 52 showed age-dependent differential expression in kings and queens. Quantitative real-time PCR revealed that DNA methyltransferase 3 is expressed specifically in the king's testis and fat body, whereas some histone modification genes are remarkably expressed in the king's testis and queen's ovary. These findings imply that epigenetic modification plays important roles in the gamete production process in termite kings and queens.
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Affiliation(s)
- Yuki Mitaka
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, Japan
- Applied Entomology Laboratory, Center for Bioresource Field Science, Kyoto Institute of Technology, Ukyo-ku, Kyoto, Japan
| | - Eisuke Tasaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Tomonari Nozaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Taro Fuchikawa
- Laboratory of Animal Physiology, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, Japan
| | - Kazuya Kobayashi
- Hokkaido Forest Research Station, Field Science Education and Research Center, Kyoto University, Kawakami-gun, Hokkaido, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, Japan
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31
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Affiliation(s)
- Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of AgricultureKyoto University Kyoto Japan
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32
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Affiliation(s)
- Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of AgricultureKyoto University Kyoto Japan
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33
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Morishita Y, Hayashi R, Matsuura K, Shinozaki T, Okano W, Tomioka T. Segmental mandibulectomy without reconstruction. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz428.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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34
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Matsuura K, Sato Y, Terauchi M, Aono M, Hashimoto S, Ogawa S, Takakuwa Y. PM-06 Electronic Structure of Nitrogen-Doped Graphite Films Studied by Soft X-ray Emission Spectroscopy. Microscopy (Oxf) 2019. [DOI: 10.1093/jmicro/dfz092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Y Sato
- IMRAM, Tohoku University, Sendai, Japan
| | | | - M Aono
- Kagoshima University, Kagoshima, Japan
| | | | - S Ogawa
- IMRAM, Tohoku University, Sendai, Japan
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35
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Nozaki T, Matsuura K. Evolutionary relationship of fat body endoreduplication and queen fecundity in termites. Ecol Evol 2019; 9:11684-11694. [PMID: 31695878 PMCID: PMC6822035 DOI: 10.1002/ece3.5664] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 08/24/2019] [Accepted: 08/26/2019] [Indexed: 01/01/2023] Open
Abstract
Endoreduplication or nuclear genome replication without cell division is widely observed in the metabolically active tissues of plants and animals. The fat body cells of adult female insects produce abundant yolk proteins and become polyploid, which is assumed to accelerate egg production. Recently, it was reported that in termites, endopolyploidy in the fat body occurs only in queens but not in the other females; however, the relationship between the fecundity and ploidy level in the fat body remains unclear. Termite queens exhibit a huge variation in their egg-producing capacity among different species; queens in the species with a foraging lifestyle, in which workers leave the nest to forage outside, are much more fecund than those in the species living in a single piece of wood. In this study, we conducted ploidy analyses on three foragings and three wood-dwelling termites via flow cytometry. In all the species, the fat body of queens contained significantly more polyploid cells than that of other nonreproductive females, considering their body size effect. However, the male fat body, which is not involved in yolk production, did not show consistency in polyploid cell numbers among the species studied. Moreover, highly fecund queens in foraging termites exhibit higher levels of endopolyploidy in their fat body than those with less fecundity in wood-dwelling termites. These results suggest that endopolyploidy in the fat body of termite queens can boost their egg production, and the level of endopolyploidy in their fat body is linked to their fecundity. Our study provides a novel insight into the evolutionary relationship between endoreduplication and caste specialization in social insects.
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Affiliation(s)
- Tomonari Nozaki
- Laboratory of Insect EcologyGraduate School of AgricultureKyoto UniversityKyotoJapan
- Center for the Development of New Model OrganismsNational Institute for Basic BiologyOkazakiJapan
| | - Kenji Matsuura
- Laboratory of Insect EcologyGraduate School of AgricultureKyoto UniversityKyotoJapan
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36
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Kadoyama K, Matsuura K, Takano M, Maekura K, Inoue Y, Matsuyama S. Changes in the expression of prefoldin subunit 5 depending on synaptic plasticity in the mouse hippocampus. Neurosci Lett 2019; 712:134484. [PMID: 31505240 DOI: 10.1016/j.neulet.2019.134484] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 09/02/2019] [Accepted: 09/04/2019] [Indexed: 10/26/2022]
Abstract
Prefoldin is a molecular chaperone that assists the folding of newly synthesized polypeptide chains and prevents aggregation of misfolded proteins. Dysfunction of prefoldin is one of the causes of neurodegenerative diseases such as Alzheimer's disease. The aim of this study was to clarify the involvement of prefoldin subunit 5 (PFDN5) in synaptic plasticity. PFDN5 protein expressed in the hippocampus was predominantly localized in the pyramidal cell layer of CA1-CA3 regions. Nicotine application caused a long-term potentiation (LTP)-like facilitation in vivo, that is synaptic plasticity, in the mouse hippocampus. The levels of PFDN5 mRNA and protein were increased 2-24 h and 4-24 h, respectively, after intraperitoneal application of nicotine (3 mg/kg, i.p.), finally returning to the basal level. This increase of PFDN5 protein was significantly inhibited by mecamylamine (0.5 mg/kg, i.p.), a non-selective nicotinic acetylcholine receptors (nAChRs) antagonist, and required combined application of ABT-418 (10 mg/kg, i.p.), a selective α4β2 nAChR agonist, and choline (30 mg/kg, i.p.), a selective α7 nAChR agonist. In transgenic mice overexpressing human tau with N279 K mutation as a model of Alzheimer's disease that showed impaired synaptic plasticity, the levels of PFDN5 mRNA and protein in the hippocampus were significantly decreased in an age-dependent manner as compared with age-matched control. The findings demonstrated that the level of PFDN5 protein in the hippocampus was changed depending on the situation of synaptic plasticity. We propose that PFDN5 could be one of the important components of synaptic plasticity.
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Affiliation(s)
- Keiichi Kadoyama
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Himeji 670-8524, Japan
| | - Kenji Matsuura
- Faculty of Pharmacy, Osaka-Ohtani University, Tondabayashi 584-8540, Japan
| | - Masaoki Takano
- Department of Life Sciences Pharmacy, School of Pharmaceutical Sciences, Kobe Gakuin University, Kobe 650-8586, Japan
| | - Koji Maekura
- Department of Life Sciences Pharmacy, School of Pharmaceutical Sciences, Kobe Gakuin University, Kobe 650-8586, Japan
| | - Yukari Inoue
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Himeji 670-8524, Japan
| | - Shogo Matsuyama
- Biosignal Research Center, Kobe University, Kobe 657-8501, Japan.
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Kuwayama T, Matsuura K, Mizukami Y, Kasahara S, Matsuda Y, Shibauchi T, Uwatoko Y, Fujiwara N. Pressure-induced Lifshitz transition in FeSe$_{0.88}$S$_{0.12}$ probed via $^{77}$Se-NMR. Pap Phys 2019. [DOI: 10.4279/pip.110003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Recently, FeSe$_{1-x}$S$_x$ systems have received much attention because of the unique pressure-temperature phase diagram. We performed $^{77}$Se-NMR measurements on a single crystal of FeSe$_{0.88}$S$_{0.12}$ to investigate its microscopic properties. The shift of $^{77}$Se spectra exhibits anomalous enhancement at $1.0~\mathrm{GPa}$, suggesting a topological change in the Fermi surfaces, so-called Lifshitz transition, occurs at $1.0~\mathrm{GPa}$. The magnetic fluctuation simultaneously changes its properties, which implies a change in the dominant nesting vector.
Edited by: A. Goñi, A. Cantarero, J. S. Reparaz
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Yashiro T, Takematsu Y, Ogawa N, Matsuura K. Taxonomic assessment of the termite genus Neotermes (Isoptera: Kalotermitidae) in the Ryukyu-Taiwan Island arc, with description of a new species. Zootaxa 2019; 4604:zootaxa.4604.3.10. [PMID: 31717184 DOI: 10.11646/zootaxa.4604.3.10] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Indexed: 11/04/2022]
Abstract
The Ryukyu Archipelago of Japan is a recognized global biodiversity hotspot with many endemic species. However, our knowledge of the termite fauna of the Ryukyu Archipelago is insufficient. Here, we report a new species of endemic drywood termite (Kalotermitidae) from the Ryukyu Archipelago. Our systematic study of the genus Neotermes (Isoptera: Kalotermitidae) from the Ryukyu-Taiwan Island arc using molecular and morphological methods found that N. koshunensis had also been composed of a second cryptic species, N. sugioi sp. nov. These two species are distributed allopatrically in the Ryukyu-Taiwan Island arc, with the former only in Taiwan and the latter only in the Ryukyu Archipelago. Our discovery of a new drywood termite species from the Ryukyu Archipelago suggests that both morphological and molecular assessments of the species now considered to be distributed widely in the Ryukyu-Taiwan Island arc are needed to clarify the termite fauna of the Ryukyu Archipelago. [Species Zoobank registration: http://zoobank.org/urn:lsid:zoobank.org:pub:E8C9693A-E24F-445D-8445-320564565964].
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Affiliation(s)
- Toshihisa Yashiro
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan School of Life and Environmental Sciences, University of Sydney, Sydney, NSW 2006, Australia.
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Otsuki T, Uka D, Ito H, Ichinose G, Nii M, Morita S, Sakamoto T, Nishiko M, Tabunoki H, Kobayashi K, Matsuura K, Iwabuchi K, Yoshimura J. Mass killing by female soldier larvae is adaptive for the killed male larvae in a polyembryonic wasp. Sci Rep 2019; 9:7357. [PMID: 31089143 PMCID: PMC6517382 DOI: 10.1038/s41598-019-43643-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 04/27/2019] [Indexed: 11/08/2022] Open
Abstract
Self-sacrifice is very rare among organisms. Here, we report a new and astonishing case of adaptive self-sacrifice in a polyembryonic parasitic wasp, Copidosoma floridanum. This wasp is unique in terms of its larval cloning and soldier larvae. Male clone larvae have been found to be killed by female soldier larvae, which suggests intersexual conflict between male and female larvae. However, we show here that mass killing is adaptive to all the killed males as well as the female soldiers that have conducted the killing because the killing increases their indirect fitness by promoting the reproduction of their clone sibs. We construct a simple model that shows that the optimal number of surviving males for both male and female larvae is very small but not zero. We then compare this prediction with the field data. These data agree quite well with the model predictions, showing an optimal killing rate of approximately 94-98% of the males in a mixed brood. The underlying mechanism of this mass kill is almost identical to the local competition for mates that occurs in other wasp species. The maternal control of the sex ratio during oviposition, which is well known in other hymenopterans, is impossible in this polyembryonic wasp. Thus, this mass kill is necessary to maximize the fitness of the female killers and male victims, which can be seen as an analogy of programmed cell death in multicellular organisms.
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Affiliation(s)
- Takahiro Otsuki
- Department of Mathematical and Systems Engineering, Shizuoka University, Hamamatsu, 432-8561, Japan
| | - Daisuke Uka
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan
- Forestry promotion and Environment Department, Kochi Prefecture Office, Kochi, 780-0850, Japan
| | - Hiromu Ito
- Department of International Health, Institute of Tropical Medicine, Nagasaki University, Nagasaki, 852-8523, Japan
- Department of Environmental Sciences, Zoology, University of Basel, 4051, Basel, Switzerland
| | - Genki Ichinose
- Department of Mathematical and Systems Engineering, Shizuoka University, Hamamatsu, 432-8561, Japan
| | - Momoka Nii
- Department of Mathematical and Systems Engineering, Shizuoka University, Hamamatsu, 432-8561, Japan
| | - Satoru Morita
- Department of Mathematical and Systems Engineering, Shizuoka University, Hamamatsu, 432-8561, Japan
| | - Takuma Sakamoto
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan
| | - Maaya Nishiko
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan
| | - Hiroko Tabunoki
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan
| | - Kazuya Kobayashi
- Hokkaido Forest Research Station, Field Science Education and Research Center, Kyoto University, Hokkaido, 088-2339, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Kikuo Iwabuchi
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan.
| | - Jin Yoshimura
- Department of Mathematical and Systems Engineering, Shizuoka University, Hamamatsu, 432-8561, Japan.
- Department of Environmental and Forest Biology, State University of New York College of Environmental Science and Forestry, Syracuse, NY, 13210, USA.
- Marine Biosystems Research Center, Chiba University, Kamogawa, Chiba, 299-5502, Japan.
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Hsu HW, Chiu MC, Shih CJ, Matsuura K, Yang CCS. Apoptosis as a primary defense mechanism in response to viral infection in invasive fire ant Solenopsis invicta. Virology 2019; 531:255-259. [DOI: 10.1016/j.virol.2019.03.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 03/25/2019] [Accepted: 03/25/2019] [Indexed: 10/27/2022]
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Matsuura K, Takami T, Maeda M, Hisanaga T, Fujisawa K, Saeki I, Matsumoto T, Hidaka I, Yamamoto N, Sakaida I. Evaluation of the Effects of Cultured Bone Marrow Mesenchymal Stem Cell Infusion on Hepatocarcinogenesis in Hepatocarcinogenic Mice With Liver Cirrhosis. Transplant Proc 2019; 51:925-935. [PMID: 30979485 DOI: 10.1016/j.transproceed.2019.03.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVES Liver transplantation remains the only curative therapy for decompensated liver cirrhosis. However, it has several limitations, and not all patients can receive liver transplants. Therefore, liver regenerative therapy without liver transplantation is considered necessary. In this study, we attempted minimally invasive liver regenerative therapy by peripheral vein infusion of bone marrow-derived mesenchymal stem cells (BMSCs) cultured from a small amount of autologous bone marrow fluid and evaluated the effects of BMSCs on hepatocarcinogenesis in a mouse model. METHODS C57BL/6 male mice were injected intraperitoneally with N-nitrosodiethylamine once at 2 weeks of age, followed by carbon tetrachloride twice a week from 6 weeks of age onwards, to create a mouse model of highly oncogenic liver cirrhosis. From 10 weeks of age, mouse isogenic green fluorescent protein-positive BMSCs (1.0 × 106/body weight) were infused once every 2 weeks, for a total of 5 times, and the effects of frequent BMSC infusion on hepatocarcinogenesis were evaluated. RESULTS In the histologic evaluation, no significant differences were observed between the controls and BMSC-administered mice in terms of incidence rate, number, or average size of foci and tumors. However, significant suppression of fibrosis and liver injury was confirmed in the group that received BMSC infusions. DISCUSSION Considering that BMSC infusion did not promote carcinogenesis, even in the state of highly oncogenic liver cirrhosis, autologous BMSC infusion might be a safe and effective therapy for human decompensated liver cirrhosis.
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Affiliation(s)
- K Matsuura
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
| | - T Takami
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan; Center for Regenerative Medicine, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan.
| | - M Maeda
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
| | - T Hisanaga
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan; Department of Medical Education, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
| | - K Fujisawa
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan; Center for Regenerative Medicine, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
| | - I Saeki
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
| | - T Matsumoto
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan; Department of Oncology and Laboratory Medicine, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
| | - I Hidaka
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan; Center for Liver Disease, Yamaguchi University Hospital, Yamaguchi University School of Medicine, Yamaguchi, Japan
| | - N Yamamoto
- Health Administration Center, Yamaguchi University, Yamaguchi, Japan
| | - I Sakaida
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan; Center for Liver Disease, Yamaguchi University Hospital, Yamaguchi University School of Medicine, Yamaguchi, Japan
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Abstract
Who should take on risky tasks in an age-heterogeneous society? Life-history theory predicts that, in social insects, riskier tasks should be undertaken by sterile individuals with a shorter life expectancy. The loss of individuals with shorter life expectancy is less costly for colony reproductive success than the loss of individuals with longer life expectancy. Termite colonies have a sterile soldier caste, specialized defenders engaged in the most risky tasks. Here we show that termite soldiers exhibit age-dependent polyethism, as old soldiers are engaged in front-line defence more than young soldiers. Our nest defence experiment showed that old soldiers went to the front line and blocked the nest opening against approaching predatory ants more often than young soldiers. We also found that young soldiers were more biased toward choosing central nest defence as royal guards than old soldiers. These results demonstrate that termite soldiers have age-based task allocation, by which ageing predisposes soldiers to switch to more dangerous tasks. This age-dependent soldier task allocation increases the life expectancy of soldiers, allowing them to promote their lifetime contribution to colony reproductive success.
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Affiliation(s)
- Saki Yanagihara
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
| | - Wataru Suehiro
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
| | - Yuki Mitaka
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan
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Eyer PA, Matsuura K, Vargo EL, Kobayashi K, Yashiro T, Suehiro W, Himuro C, Yokoi T, Guénard B, Dunn RR, Tsuji K. Inbreeding tolerance as a pre-adapted trait for invasion success in the invasive ant Brachyponera chinensis. Mol Ecol 2018; 27:4711-4724. [PMID: 30368959 DOI: 10.1111/mec.14910] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 10/03/2018] [Accepted: 10/08/2018] [Indexed: 01/17/2023]
Abstract
Identifying traits that facilitate species introductions and successful invasions of ecosystems represents a key issue in ecology. Following their establishment into new environments, many non-native species exhibit phenotypic plasticity with post-introduction changes in behaviour, morphology or life history traits that allow them to overcome the presumed loss of genetic diversity resulting in inbreeding and reduced adaptive potential. Here, we present a unique strategy in the invasive ant Brachyponera chinensis (Emery), in which inbreeding tolerance is a pre-adapted trait for invasion success, allowing this ant to cope with genetic depletion following a genetic bottleneck. We report for the first time that inbreeding is not a consequence of the founder effect following introduction, but it is due to mating between sister queens and their brothers that pre-exists in native populations which may have helped it circumvent the cost of invasion. We show that a genetic bottleneck does not affect the genetic diversity or the level of heterozygosity within colonies and suggest that generations of sib-mating in native populations may have reduced inbreeding depression through purifying selection of deleterious alleles. This work highlights how a unique life history may pre-adapt some species for biological invasions.
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Affiliation(s)
- Pierre-André Eyer
- Department of Entomology, 2143 TAMU, Texas A&M University, College Station, Texas
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Edward L Vargo
- Department of Entomology, 2143 TAMU, Texas A&M University, College Station, Texas
| | - Kazuya Kobayashi
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Toshihisa Yashiro
- Molecular Ecology, Evolution, and Phylogenetics (MEEP) laboratory School of Life and Environmental Sciences, The University of Sydney, Sydney, Australia
| | - Wataru Suehiro
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Chihiro Himuro
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Tomoyuki Yokoi
- Laboratory of Conservation Ecology, University of Tsukuba, Tsukuba, Japan
| | - Benoit Guénard
- School of Biological Sciences, The University of Hong Kong, Hong Kong SAR, Hong Kong
| | - Robert R Dunn
- Department of Applied Ecology, North Carolina State University, Raleigh, North Carolina.,German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany.,Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Copenhagen Ø, Denmark
| | - Kazuki Tsuji
- Faculty of Agriculture, University of the Ryukyus, Nishihara, Okinawa, Japan
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Tasaki E, Matsuura K, Iuchi Y. Hypoxia adaptation in termites: hypoxic conditions enhance survival and reproductive activity in royals. Insect Mol Biol 2018; 27:808-814. [PMID: 29989656 DOI: 10.1111/imb.12519] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Termite royals (queen and king) exhibit extraordinary longevity without sacrificing reproductive performance, unlike most animals, in whom lifespan is generally negatively associated with reproduction. Therefore, the regulatory mechanisms underlying longevity have attracted much attention. Although the ageing process is influenced by environmental factors in many insects during their life cycle, it remains unclear whether any factors have an effect on the extended survival and high reproductive capacity of termite royals. Here, we show that hypoxia, possibly an important environmental factor in the nests, enhances survival and reproductive activity in incipient royals of the subterranean termite Reticulitermes speratus compared with those in control conditions. Quantitative real-time PCR analysis revealed that the expression levels of the vitellogenin gene in queens are maintained to a greater extent under hypoxic conditions than under control conditions. The expression levels of the antioxidant enzyme genes RsCAT1 and RsPHGPX are also significantly promoted by hypoxia in queens and kings respectively. These results suggest that hypoxic exposure can contribute in part to achieving high reproductive output by altering gene expression after founding of colonies in the royals. Our study provides novel insights into the effect of a nest environment on the reproductive characteristics in termite royals.
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Affiliation(s)
- E Tasaki
- Department of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
- Department of Applied Bioresources Chemistry, The United Graduate School of Agriculture, Tottori University, Tottori, Japan
| | - K Matsuura
- Department of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Y Iuchi
- Department of Applied Bioresources Chemistry, The United Graduate School of Agriculture, Tottori University, Tottori, Japan
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, Japan
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Hirokawa J, Matsuura K, Katsuta T, Kagemoto M. Investigation of the Optimum S-1 Dosing Schedule of Concurrent Chemoradiotherapy for T2N0 Glottic Cancer: A Comparison of Alternate-Day Administration Versus Daily Administration. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Tasaki E, Mitaka Y, Nozaki T, Kobayashi K, Matsuura K, Iuchi Y. High expression of the breast cancer susceptibility gene BRCA1 in long-lived termite kings. Aging (Albany NY) 2018; 10:2668-2683. [PMID: 30312170 PMCID: PMC6224230 DOI: 10.18632/aging.101578] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Accepted: 09/25/2018] [Indexed: 12/12/2022]
Abstract
Aging is associated with the accumulation of DNA damage. High expression of DNA repair genes has been suggested to contribute to prolonged lifespan in several organisms. However, the crucial DNA repair genes contributing to longevity remain unknown. Termite kings have an extraordinary long lifespan compared with that of non-reproductive individuals such as workers despite being derived from the same genome, thus providing a singular model for identifying longevity-related genes. In this study, we demonstrated that termite kings express higher levels of the breast cancer susceptibility gene BRCA1 than other castes. Using RNA sequencing, we identified 21 king-specific genes among 127 newly annotated DNA repair genes in the termite Reticulitermes speratus. Using quantitative PCR, we revealed that some of the highly expressed king-specific genes were significantly upregulated in reproductive tissue (testis) compared to their expression in somatic tissue (fat body). Notably, BRCA1 gene expression in the fat body was more than 4-fold higher in kings than in workers. These results suggest that BRCA1 partly contributes to DNA repair in somatic and reproductive tissues in termite kings. These findings provide important insights into the linkage between BRCA1 gene expression and the extraordinary lifespan of termite kings.
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Affiliation(s)
- Eisuke Tasaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
- Department of Applied Bioresources Chemistry, The United Graduate School of Agriculture, Tottori University, Tottori 680-8553, Japan
- Equal contribution
| | - Yuki Mitaka
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
- Equal contribution
| | - Tomonari Nozaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Kazuya Kobayashi
- Hokkaido Forest Research Station, Field Science Education and Research Center, Kyoto University, Hokkaido 088-2339, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Yoshihito Iuchi
- Department of Applied Bioresources Chemistry, The United Graduate School of Agriculture, Tottori University, Tottori 680-8553, Japan
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8515, Japan
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Imamura Y, Kiyota N, Akimoto T, Ogawa G, Eba J, Minami S, Hasegawa Y, Iwae S, Monden N, Matsuura K, Fujii H, Onozawa Y, Homma A, Hayashi R, Tahara M. Nutritional support dependence after curative chemoradiotherapy in head and neck cancer: A supplementary analysis of a phase II trial (JCOG0706S1). Ann Oncol 2018. [DOI: 10.1093/annonc/mdy287.068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Asahi Y, Hamada T, Hattori A, Matsuura K, Odaka M, Nomura F, Kaneko T, Abe Y, Takasuna K, Sanbuissho A, Yasuda K. On-chip spatiotemporal electrophysiological analysis of human stem cell derived cardiomyocytes enables quantitative assessment of proarrhythmia in drug development. Sci Rep 2018; 8:14536. [PMID: 30266924 PMCID: PMC6162288 DOI: 10.1038/s41598-018-32921-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 09/17/2018] [Indexed: 12/17/2022] Open
Abstract
We examined a simultaneous combined spatiotemporal field potential duration (FPD) and cell-to-cell conduction time (CT) in lined-up shaped human embryonic stem cell-derived cardiomyocytes (hESC-CMs) using an on-chip multielectrode array (MEA) system to evaluate two origins of lethal arrhythmia, repolarization and depolarization. The repolarization index, FPD, was prolonged by E-4031 and astemizole, and shortened by verapamil, flecainide and terfenadine at 10 times higher than therapeutic plasma concentrations of each drug, but it did not change after lidocaine treatment up to 100 μM. CT was increased by astemizol, flecainide, terfenadine, and lidocaine at equivalent concentrations of Nav1.5 IC50, suggesting that CT may be an index of cardiac depolarization because the increase in CT (i.e., decrease in cell-to-cell conduction speed) was relevant to Nav1.5 inhibition. Fluctuations (short-term variability; STV) of FPD and CT, STVFPD and STVCT also discriminated between torsadogenic and non-torsadogenic compounds with significant increases in their fluctuation values, enabling precise prediction of arrhythmogenic risk as potential new indices.
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Affiliation(s)
- Yumiko Asahi
- Medicinal Safety Research Laboratories, Kasai R&D Center, Daiichi-Sankyo Co. Ltd., Edogawa, Tokyo, 134-8630, Japan
| | - Tomoyo Hamada
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo, 101-0062, Japan
- Chiome Bioscience Inc. Shibuya, Tokyo, 151-0071, Japan
| | - Akihiro Hattori
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo, 101-0062, Japan
- Organization for University Research Initiatives, Waseda University, 3-14-9 Ookubo, Shinjuku, Tokyo, 169-0072, Japan
- Waseda Bioscience Research Institute in Singapore (WABOIS), Helios, 11 Biopolis Way, 138667, Singapore
| | - Kenji Matsuura
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo, 101-0062, Japan
- Organization for University Research Initiatives, Waseda University, 3-14-9 Ookubo, Shinjuku, Tokyo, 169-0072, Japan
- Waseda Bioscience Research Institute in Singapore (WABOIS), Helios, 11 Biopolis Way, 138667, Singapore
| | - Masao Odaka
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo, 101-0062, Japan
- Organization for University Research Initiatives, Waseda University, 3-14-9 Ookubo, Shinjuku, Tokyo, 169-0072, Japan
- Waseda Bioscience Research Institute in Singapore (WABOIS), Helios, 11 Biopolis Way, 138667, Singapore
| | - Fumimasa Nomura
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo, 101-0062, Japan
| | - Tomoyuki Kaneko
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo, 101-0062, Japan
- Department of Frontier Bioscience, Hosei Univ., Koganei, Tokyo, 184-8584, Japan
| | - Yasuyuki Abe
- Medicinal Safety Research Laboratories, Kasai R&D Center, Daiichi-Sankyo Co. Ltd., Edogawa, Tokyo, 134-8630, Japan
| | - Kiyoshi Takasuna
- Medicinal Safety Research Laboratories, Kasai R&D Center, Daiichi-Sankyo Co. Ltd., Edogawa, Tokyo, 134-8630, Japan
| | - Atsushi Sanbuissho
- Medicinal Safety Research Laboratories, Kasai R&D Center, Daiichi-Sankyo Co. Ltd., Edogawa, Tokyo, 134-8630, Japan
| | - Kenji Yasuda
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo, 101-0062, Japan.
- Organization for University Research Initiatives, Waseda University, 3-14-9 Ookubo, Shinjuku, Tokyo, 169-0072, Japan.
- Waseda Bioscience Research Institute in Singapore (WABOIS), Helios, 11 Biopolis Way, 138667, Singapore.
- Department of Pure and Applied Physics, Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan.
- Department of Physics, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan.
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Yashiro T, Lo N, Kobayashi K, Nozaki T, Fuchikawa T, Mizumoto N, Namba Y, Matsuura K. Loss of males from mixed-sex societies in termites. BMC Biol 2018; 16:96. [PMID: 30249269 PMCID: PMC6154949 DOI: 10.1186/s12915-018-0563-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2018] [Accepted: 08/09/2018] [Indexed: 11/13/2022] Open
Abstract
Background Sexual reproduction is the norm in almost all animal species, and in many advanced animal societies, both males and females participate in social activities. To date, the complete loss of males from advanced social animal lineages has been reported only in ants and honey bees (Hymenoptera), whose workers are always female and whose males display no helping behaviors even in normal sexual species. Asexuality has not previously been observed in colonies of another major group of social insects, the termites, where the ubiquitous presence of both male and female workers and soldiers indicate that males play a critical role beyond that of reproduction. Results Here, we report asexual societies in a lineage of the termite Glyptotermes nakajimai. We investigated the composition of mature colonies from ten distinct populations in Japan, finding six asexual populations characterized by a lack of any males in the reproductive, soldier, and worker castes of their colonies, an absence of sperm in the spermathecae of their queens, and the development of unfertilized eggs at a level comparable to that for the development of fertilized eggs in sexual populations of this species. Phylogenetic analyses indicated a single evolutionary origin of the asexual populations, with divergence from sampled sexual populations occurring about 14 million years ago. Asexual colonies differ from sexual colonies in having a more uniform head size in their all-female soldier caste, and fewer soldiers in proportion to other individuals, suggesting increased defensive efficiencies arising from uniform soldier morphology. Such efficiencies may have contributed to the persistence and spread of the asexual lineage. Cooperative colony foundation by multiple queens, the single-site nesting life history common to both the asexual and sexual lineages, and the occasional development of eggs without fertilization even in the sexual lineage are traits likely to have been present in the ancestors of the asexual lineage that may have facilitated the transition to asexuality. Conclusions Our findings demonstrate that completely asexual social lineages can evolve from mixed-sex termite societies, providing evidence that males are dispensable for the maintenance of advanced animal societies in which they previously played an active social role. Electronic supplementary material The online version of this article (10.1186/s12915-018-0563-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Toshihisa Yashiro
- School of Life and Environmental Sciences, Edgeworth David Building A11, University of Sydney, Sydney, NSW, 2006, Australia. .,Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan.
| | - Nathan Lo
- School of Life and Environmental Sciences, Edgeworth David Building A11, University of Sydney, Sydney, NSW, 2006, Australia
| | - Kazuya Kobayashi
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Tomonari Nozaki
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Taro Fuchikawa
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Nobuaki Mizumoto
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Yusuke Namba
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Kenji Matsuura
- Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
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Inagaki T, Matsuura K. Extended mutualism between termites and gut microbes: nutritional symbionts contribute to nest hygiene. Naturwissenschaften 2018; 105:52. [DOI: 10.1007/s00114-018-1580-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 08/14/2018] [Accepted: 08/14/2018] [Indexed: 01/16/2023]
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