Publications

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effects of isolation by continental islands in the seto inland sea, japan, on genetic diversity of the large japanese field mouse, apodemus speciosus (rodentia: muridae), inferred from the mitochondrial dloop region.to study the effects of post-glacial isolation by islands on population genetic diversity and differentiation of the large japanese field mouse, apodemus speciosus, we examined partial nucleotide sequences of the mitochondrial dloop region (ca. 300 bp) in 231 individuals collected from islands in the seto inland sea and adjacent regions on honshu and shikoku islands in the western part of the japanese archipelago. molecular phylogenetic and network analyses showed that haplotypes in each island ...201728397602
geographic variation of absolute and relative lower molar sizes in two closely related species of japanese field mice (apodemus speciosus and apodemus argenteus: muridae, rodentia).geographic variation of the sizes of lower molar (m1 size) and relative lower molar sizes (size proportions among m1, m2, and m3) were examined in two species of closely related japanese field mice (apodemus speciosus and apodemus argenteus). to determine the cause of the geographic variations observed, phylogeographic structure, interspecific competition, climate, and location (mainland or island) were compared. with regard to the phylogeographic structure, the sizes of the molar and the relati ...201728148213
chromosomal aberrations in large japanese field mice (apodemus speciosus) captured near fukushima dai-ichi nuclear power plant.since the fukushima dai-ichi nuclear power plant accident, radiation effects on nonhuman biota in the contaminated areas have been a major concern. here, we analyzed the frequencies of chromosomal aberrations (translocations and dicentrics) in the splenic lymphocytes of large japanese field mice (apodemus speciosus) inhabiting fukushima prefecture. a. speciosus chromosomes 1, 2, and 5 were flow-sorted in order to develop a. speciosus chromosome-specific painting probes, and fish (fluorescence in ...201728363014
comment on "chromosomal aberrations in large japanese field mice (apodemus speciosus) captured near fukushima dai-ichi nuclear power plant". 201728654249
estimation of evolutionary rates of mitochondrial dna in two japanese wood mouse species based on calibrations with quaternary environmental changes.reliable estimates of evolutionary rates of mitochondrial dna might allow us to build realistic evolutionary scenarios covering broad time scales based on phylogenetic inferences. in the present study, we sought to obtain estimates of evolutionary rates in murine rodents using calibrations against historical biogeographic events. we first assumed that land-bridge-like structures that appeared intermittently at glacial maxima with 100,000-year intervals shaped the divergence patterns of cytochrom ...201728589839
analysis of the effect of chronic and low-dose radiation exposure on spermatogenic cells of male large japanese field mice ( apodemus speciosus ) after the fukushima daiichi nuclear power plant accident.in this study we analyzed the effect of chronic and low-dose-rate (ldr) radiation on spermatogenic cells of large japanese field mice ( apodemus speciosus ) after the fukushima daiichi nuclear power plant (fnpp) accident. in march 2014, large japanese field mice were collected from two sites located in, and one site adjacent to, the fnpp ex-evacuation zone: tanashio, murohara and akogi, respectively. testes from these animals were analyzed histologically. external dose rate from radiocesium (com ...201728092218
brachylaima asakawai sp. nov. (trematoda: brachylaimidae), a rodent intestinal fluke in hokkaido, japan, with a finding of the first and second intermediate hosts.in the 1970's and 1980's, an unknown species of the genus brachylaima (trematoda: brachylaimidae) had been recorded from the intestines of rattus norvegicus and apodemus speciosus in hokkaido, japan. the rodent fluke was characteristic in extending a bilateral vitellarium till the level of posterior margin of anterior testis and in keeping almost the same-sized spherical ovary and testes. in this study, the rodent fluke was rediscovered from a. speciosus, apodemus argenteus, and myodes rufocanus ...201829705144
individual variation of daily torpor and body mass change during winter in the large japanese field mouse (apodemus speciosus).daily torpor is a strategy used by some overwintering small endotherms to aid in energy conservation. however, the pattern of torpor varies among individuals within species and populations, even under the same environmental conditions, with significant implications for survival rate and reproductive success. body mass is one factor that may influence this variation, especially in some small mammals that accumulate fat stores prior to overwintering. however, to our knowledge there has been no pre ...201830194463
radiation-induced bystander effect in large japanese field mouse (apodemus speciosus) embryonic cells.although evidence suggests that ionizing radiation can induce the bystander effect (radiation-induced bystander effect: ribe) in cultured cells or mouse models, it is unclear whether the effect occurs in cells of wild animals. we investigated medium-mediated bystander micronucleus (mn) formation and dna damage in un-irradiated cells from a large japanese field mouse (apodemus speciosus). we isolated four clones of a. speciosus embryonic fibroblasts (a603-1, a603-2, a603-3, and a603-4) derived fr ...201829785486
draft genome sequence of japanese wood mouse, apodemus speciosus.the wood mouse (genus apodemus) is one of the most common rodents in broad-leaf forests in the temperate zone of the palaearctic region. molecular studies of wood mice have critically enhanced the understanding of their evolution and ancestral biogeographic events. however, their molecular data are currently only limited to partial mitochondrial sequences and a few genes. therefore, we sequenced the wood mouse genome to facilitate the acquisition of useful resources for inferring their molecular ...201829541656
induction of superovulation using inhibin antiserum and competence of embryo development in wild large japanese field mice (apodemus speciosus).seasonally, bred wild mice provide a unique bioresource, with high genetic diversity that differs from wild-derived mice and laboratory mice. this study aimed to establish an alternative superovulation method using wild large japanese field mice (apodemus speciosus) as the model species. specifically, we investigated how the application of inhibin antiserum and equine chorionic gonadotropin (iase) during both the reproductive and non-reproductive seasons impact the ovulation rate and competence ...201931587388
determination of whole-body and lens dose conversion factors for japanese field mice, apodemus speciosus.the 11 march 2011 fukushima nuclear accident in japan resulted in widespread radioactive contamination within the 20 km evacuation zone. japanese field mice (apodemus speciosus) living within the contaminated region received radiation doses from external environmental contamination as well as internally deposited radionuclides. cataract formation in the lens of eyes of these mice is a possible deterministic effect of ionizing radiation; however, determination of actual doses is difficult. since ...201930908317
comparison of the intestinal helminth community of the large japanese field mouse (apodemus speciosus) between urban, rural, and natural sites in hokkaido, japan.anthropogenic ecosystem modification has affected over 80% of the global land cover. interest in its effects on wildlife has been growing over the past several decades, specifically in regard to biodiversity and ecosystem function. parasites are of particular interest, because they directly impact animal health, and can be transmitted to humans through the process of zoonosis. however, most studies so far tended to focus on only one or two parasites with few looking at the entire community, ther ...201930716461
seasonal changes in the spermatogenesis of the large japanese field mice (apodemus speciosus) controlled by proliferation and apoptosis of germ cells.the aim of this study was to investigate the proliferation and apoptosis of male germ cells during the seasonal reproductive cycle of the large japanese field mice (apodemus speciosus). male mice residing in their natural habitat were captured in niigata, japan. testis sections were stained with haematoxylin and eosin, and mitotic male germ cells were identified using immunofluorescence staining for proliferating cell nuclear antigen (pcna). apoptosis was analysed using terminal deoxynucleotidyl ...202032087913
cold temperature improves tannin tolerance in a granivorous rodent.the foraging ecology of mammalian herbivores is regulated in part by their ability to detoxify plant secondary metabolites (psm). ambient temperature has been shown to alter liver function in rodents and the toxicity of some psms, but little is known about the physiological and nutritional consequences of consuming psms at different ambient temperatures. furthermore, the effect of ambient temperature on the response of mammals to the most ubiquitous class of psm, tannins, is unknown. we measured ...202031580494
environmental radiation on large japanese field mice in fukushima reduced colony forming potential in hematopoietic progenitor cells without inducing genomic instability.to study the environmental radiation effects of wild animals after the fukushima dai-ichi nuclear power plant accident, we assessed effects on hematopoietic progenitor cells (hpcs) in large japanese field mice (apodemus speciosus).202032791031
assessment of chromosome aberrations in large japanese field mice (apodemus speciosus) in namie town, fukushima.after the fukushima daiichi nuclear power plant (fdnpp) accident in japan on march 11 2011, the surroundings became contaminated with radionuclides. to understand the possible biological effects after chronic low dose-rate radiation in contaminated areas of fukushima, we assessed the effects in large japanese field mice (apodemus speciosus) by means of chromosome aberration analysis.202032602392
developmental competence of interspecies cloned embryos produced using cells from large japanese field mice (apodemus speciosus) and oocytes from laboratory mice (mus musculus domesticus).the large japanese field mouse (apodemus speciosus) is endemic to japan and may be used as an animal model for studies related to environmental pollution, medical science, and basic biology. however, the large japanese field mouse has low reproductive ability due to the small number of oocytes ovulated per female. to produce experimental models, we investigated the in vitro developmental potential of interspecies somatic cell nuclear transfer (iscnt) embryos produced by fusing tail tip cells fro ...202032213735
rodent-borne orthohantaviruses in vietnam, madagascar and japan.hantaviruses are harbored by multiple small mammal species in asia, europe, africa, and the americas. to ascertain the geographic distribution and virus-host relationships of rodent-borne hantaviruses in japan, vietnam, myanmar, and madagascar, rnalater™-preserved lung tissues of 981 rodents representing 40 species, collected in 2011-2017, were analyzed for hantavirus rna by rt-pcr. our data showed hantaan orthohantavirus da bie shan strain in the chinese white-bellied rat (niviventer confucianu ...202134372549
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