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Published Papers 【 display / non-display 】

• First report of the snail mite Riccardoella triodopsis (Acari: Ereynetidae) from Mainland China

  Tsukasa Waki, Takahiro Hirano, Bin Ye, Satoshi Shimano

  Edaphologia   112   31 - 34   2023.01 [ Peer Review Accepted ]

  Type of publication: Research paper (other science council materials etc.)

• Phylogenomic analyses reveal incongruences between divergence times and fossil records of freshwater snails in East Asia

  Takahiro Hirano, Takumi Saito, Shun Ito, Bin Ye, T. Mason Linscott, Do Van Tu, Zhengzhong Dong, Satoshi Chiba

  Molecular Phylogenetics and Evolution   in press   2023 [ Peer Review Accepted ]

  Type of publication: Research paper (other science council materials etc.)

• Taxonomic insights and evolutionary history in East Asia terrestrial slugs of the genus Meghimatium

  Shun Ito, Daishi Yamazaki, Yuichi Kameda, Osamu Kagawa, Bin Ye, Takumi Saito, Kazuki Kimura, Van Tu Do, Satoshi Chiba, Takahiro Hirano

  Molecular Phylogenetics and Evolution   in press   2023 [ Peer Review Accepted ]

  Type of publication: Research paper (other science council materials etc.)

• De novo genome assembly and genome skims reveal LTRs dominate the genome of a limestone endemic Mountainsnail (Oreohelix idahoensis)

  T. Mason Linscott, Andrea González-González, Takahiro Hirano, Christine E. Parent

  BMC Genomics ( Springer Science and Business Media LLC )  23 ( 1 )   2022.12 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Abstract Background Calcareous outcrops, rocky areas composed of calcium carbonate (CaCO₃), often host a diverse, specialized, and threatened biomineralizing fauna. Despite the repeated evolution of physiological and morphological adaptations to colonize these mineral rich substrates, there is a lack of genomic resources for calcareous rock endemic species. This has hampered our ability to understand the genomic mechanisms underlying calcareous rock specialization and manage these threatened species. Results Here, we present a new draft genome assembly of the threatened limestone endemic land snail Oreohelix idahoensis and genome skim data for two other Oreohelix species. The O. idahoensis genome assembly (scaffold N50: 404.19 kb; 86.6% BUSCO genes) is the largest (~ 5.4 Gb) and most repetitive mollusc genome assembled to date (85.74% assembly size). The repetitive landscape was unusually dominated by an expansion of long terminal repeat (LTR) transposable elements (57.73% assembly size) which have shaped the evolution genome size, gene composition through retrotransposition of host genes, and ectopic recombination. Genome skims revealed repeat content is more than 2–3 fold higher in limestone endemic O. idahoensis compared to non-calcareous Oreohelix species. Gene family size analysis revealed stress and biomineralization genes have expanded significantly in the O. idahoensis genome. Conclusions Hundreds of threatened land snail species are endemic to calcareous rock regions but there are very few genomic resources available to guide their conservation or determine the genomic architecture underlying CaCO₃ resource specialization. Our study provides one of the first high quality draft genomes of a calcareous rock endemic land snail which will serve as a foundation for the conservation genomics of this threatened species and for other groups. The high proportion and activity of LTRs in the O. idahoensis genome is unprecedented in molluscan genomics and sheds new light how transposable element content can vary across molluscs. The genomic resources reported here will enable further studies of the genomic mechanisms underlying calcareous rock specialization and the evolution of transposable element content across molluscs.

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• The mutual history of Schlegel's Japanese gecko (Reptilia: Squamata: Gekkonidae) and humans inscribed in genes and ancient literature

  Minoru Chiba, Takahiro Hirano, Daishi Yamazaki, Bin Ye, Shun Ito, Osamu Kagawa, Komei Endo, Shu Nishida, Seiji Hara, Kenichiro Aratake, Satoshi Chiba

  PNAS Nexus ( Oxford University Press (OUP) )  1 ( 5 )   2022.11 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Abstract Knowing how the present distribution of organisms was formed is an essential issue in evolutionary ecology. Recently, the distribution of organisms on Earth has been significantly changed by human-mediated dispersal due to globalization. Therefore, significant attention has been paid to such processes. However, although humankind has taken considerable time to achieve modernization, the impact of ancient human activity on ecosystems has not yet been thoroughly studied. We hypothesized that ancient urban development and transitions had a non-negligible effect on species distribution. Inferring the impact of past human activity on ecosystems from ancient literature and verifying that impact by genetic analysis and human history is an effective means of tackling this problem. As geckos, a popular neighbor of human dwellings, are good material for this model, we performed this combination approach using Schlegel's Japanese gecko, Gekko japonicus. We show that G. japonicus migrated from China to the western Japanese archipelago before Christ. The gecko species dispersed itself from western to eastern the archipelago on a time scale of thousands of years. There are many synchronizations between the dispersal history of G. japonicus and the historical development of human society. It is suggested by such synchronizations that humans have influenced the distribution of G. japonicus many times throughout its dispersal history.

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Books 【 display / non-display 】

• Routledge handbook of Japanese cinema

  Bernardi Joanne R., Ogawa Shota T. ( Part: Single Author )

  Routledge  2021

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• Morphological diversification of the intertidal snail in the narrow distribution range: a case of Littorina horikawai endemic to the western Kyushu, Japan

  Yamazaki D, Seo T, Hirano T, Saito T, Kameda Y, Fukuda H, Chiba S

  International Congress on Invertebrate Morphology 5 (Vienna, Austria)  1900.01  -  1900.01 

• Diversification of Littorina horikawai endemic in the western coast of Kyushu, Japan

  Yamazaki D, Seo T, Hirano T, Saito T, Kameda Y, Fukuda H, Chiba S

  World Congress of Malacology 2022 (Munich, Germany)  1900.01  -  1900.01 

• Dispersal is a driver for the diversification of Gyraulus spp. on both continental and oceanic islands

  Saito T, Hirano T, Prozorova L, Do VT, Ye B, Shovon MS, Uchida S, Surenkhorloo P, Morii Y, Kimura K, Yamazaki D, Sasaki T, Tsunamoto Y, Satake K, Fukuda H, Suyama Y, Chiba S

  World Congress of Malacology 2022 (Munich, Germany)  1900.01  -  1900.01 

Academic Awards 【 display / non-display 】

Academic Awards 【 display / non-display 】

• The Best Award Selected by the Chairman of the Graduate School of Life Sciences

  2016.03   Graduate School of Life Sciences, Tohoku University  

  Winner: Hirano, T

• The Award for Excellent Doctoral Thesis

  2016.03   Graduate School of Life Sciences, Tohoku University  

  Winner: Hirano, T

Social Activity 【 display / non-display 】

Social Activity 【 display / non-display 】

• 2023.10

  　

  　

  

• 2023.04

  　

  　

  

• 2013

  　

  　

Academic Activities 【 display / non-display 】

Academic Activities 【 display / non-display 】

• 沖縄県・長崎県・岡山県・三重県・宮城県・山形県・環境省 

  2015

  　

  　

  種別： Academic research