|
Affiliation |
Faculty of Medicine School of Medicine Department of Infectious Diseases, Parasitology |
|
Title |
Assistant Professor |
|
External Link |
|
TANAKA Ryusei
|
|
|
Papers 【 display / non-display 】
-
Kawahara K, Inada T, Tanaka R, Dayi M, Makino T, Maruyama S, Kikuchi T, Sugimoto A, Kawata M
Genome biology and evolution 15 ( 4 ) 2023.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Genome biology and evolution
Why the recently discovered nematode Caenorhabditis inopinata differs so greatly from its sibling species Caenorhabditis elegans remains unknown. A previous study showed that C. inopinata has more transposable elements (TEs), sequences that replicate and move autonomously throughout the genome, potentially altering the expression of neighboring genes. In this study, we focused on how the body size of this species has evolved and whether TEs could affect the expression of genes related to species-specific traits such as body size. First, we compared gene expression levels between C. inopinata and C. elegans in the L4 larval and young adult stages-when growth rates differ most prominently between these species-to identify candidate genes contributing to their differences. The results showed that the expression levels of collagen genes were consistently higher in C. inopinata than in C. elegans and that some genes related to cell size were differentially expressed between the species. Then, we examined whether genes with TE insertions are differentially expressed between species. Indeed, the genes featuring C. inopinata-specific TE insertions had higher expression levels in C. inopinata than in C. elegans. These upregulated genes included those related to body size, suggesting that these genes could be candidates for artificial TE insertion to examine the role of TEs in the body size evolution of C. inopinata.
DOI： 10.1093/gbe/evad063
-
Ko P.P., Haraguchi M., Hara T., Hieu D.D., Ito A., Tanaka R., Tanaka M., Suzumura T., Ueda M., Yoshida A., Maruyama H., Nagayasu E.
Parasitology International 92 102663 2023.2
Language：English Publishing type：Research paper (scientific journal) Publisher：Parasitology International
Strongyloides is a genus of parasitic nematodes of vertebrates comprising approximately 50 documented species, each with various host ranges. Among these, three species (S. stercoralis, S. fuelleborni, and S. cebus) are known to infect primate hosts. S. fuelleborni typically infects non-human primates in the Old World. To complement the existing information on the global genetic structure of this species, we conducted a genotyping study of S. fuelleborni samples collected from rhesus macaques in Myanmar, Japanese macaques in Japan, and some zoo-kept primates. This study identified a novel haplotype group in isolates from the Myanmar rhesus macaques. Subsequently, we obtained the complete or nearly complete mitochondrial genome sequences of S. fuelleborni, S. cebus (Strongyloides of New World monkeys), and S. vituli (Strongyloides of cattle). Phylogenetic analysis based on concatenated mitochondrial protein sequences of various Strongyloides species indicated a close relationship between S. fuelleborni, S. vituli and S. papillosus (Strongyloides in sheep and cattle). S. cebus is quite distantly related to both S. fuelleborni and S. stercoralis, which led to the hypothesis that the three primate Strongyloides species evolved independently as parasites of primates.
-
Kanzaki N., Tanaka R., Giblin-Davis R.M.
Nematology 25 ( 5 ) 509 - 529 2023
Publishing type：Research paper (scientific journal) Publisher：Nematology
A Schistonchus species was isolated from the syconia of the creeping fig, Ficus pumila, collected from Miyazaki, Japan. The nematode was considered an undescribed species based on its typological characters, molecular profiles (near full length of small subunit and D3 expansion segment of large subunit of RNA) and phylogenetic status inferred from these two loci. The new species is characterised by the presence of flagellate sperm, spicule possessing small condylus, triangular rostrum with bluntly pointed tip and clear dorsal and ventral limbs, structure and arrangement of male caudal papillae, i.e., presence of papilliform P3 and P3a and small and gland opening-like P4 (glandpapillae), relatively short post-uterine sac and female tail forming elongate conoid. It is phylogenetically close to S. hirtus. However, the new species is distinguished from other nominal Schistonchus species by its female tail shape forming elongate conoid, the structure and arrangement of male caudal papillae and several other typological characters. In addition, the host fig of the nematode, F. pumila, is a creeper fig species belonging to subgenus Synoecia (section Rhizocladus; subsection Plagiostigma), from which no fig-Associated nematode has been reported so far, i.e., the present study is the first report of Schistonchus (and other syconia-inhabiting nematodes) from the Ficus subgenus Synoecia. Keywords
-
The compact genome of Caenorhabditis niphades n. sp., isolated from a wood-boring weevil, Niphades variegatus Reviewed International coauthorship
Sun S., Kanzaki N., Dayi M., Maeda Y., Yoshida A., Tanaka R., Kikuchi T.
BMC Genomics 23 ( 1 ) 765 2022.12
Language：English Publishing type：Research paper (scientific journal) Publisher：BMC Genomics
Background: The first metazoan genome sequenced, that of Caenorhabditis elegans, has motivated animal genome evolution studies. To date > 50 species from the genus Caenorhabditis have been sequenced, allowing research on genome variation. Results: In the present study, we describe a new gonochoristic species, Caenorhabditis niphades n. sp., previously referred as C. sp. 36, isolated from adult weevils (Niphades variegatus), with whom they appear to be tightly associated during its life cycle. Along with a species description, we sequenced the genome of C. niphades n. sp. and produced a chromosome-level assembly. A genome comparison highlighted that C. niphades n. sp. has the smallest genome (59 Mbp) so far sequenced in the Elegans supergroup, despite being closely related to a species with an exceptionally large genome, C. japonica. Conclusions: The compact genome of C. niphades n. sp. can serve as a key resource for comparative evolutionary studies of genome and gene number expansions in Caenorhabditis species.
-
Fungi isolated from phylloplane of <i>Lepisorus thunbergianus</i>
Shibata Saho, Kishimoto Keiko, Tanaka Ryusei, Takemoto Shuhei, Hirooka Yuuri
The Japanese Forest Society Congress 133 ( 0 ) 639 2022.5
Language：Japanese Publishing type：Research paper (conference, symposium, etc.) Publisher：THE JAPANESE FORESTRY SOCIETY
[in Japanese]
Books 【 display / non-display 】
-
Nematodes Exploiting P. japonensis
Toyoshi Yoshiga, Ryusei Tanaka, Etsuko Okamura（ Role： Contributor）
Springer Nature 2022.10
Book type：Scholarly book
-
生き物と音の辞典
高梨 琢磨 他（ Role： Joint author , 線虫の振動受容）
朝倉書店 2019.9
Total pages：441 Responsible for pages：336-337 Language：Japanese Book type：Scholarly book
音と音に類する刺激に対する様々な生物の反応の知見をまとめた著書。線虫の振動受容について担当。
Presentations 【 display / non-display 】
-
A sparganosis in which numerous plerocercoid were detected
Ryusei Tanaka, Mio Tanaka, Kanako Yamasaki, Eiji Nagayasu, Tomoaki Kubo, Haruhiko Maruyama
The 93rd Annual Meeting of the Japanese Society of Parasitology 2024.3.9
Event date： 2024.3.9 - 2024.3.10
Language：Japanese Presentation type：Oral presentation (general)
-
ネズミ糞線虫Strongyloides rattiの自由生活世代と細菌の関係
田中龍聖・石田まり・太田有咲・地下勇矢・丸山治彦
第92回日本寄生虫学会大会 2022.5
Event date： 2022.5.30 - 2022.5.31
Presentation type：Poster presentation
-
Relationship of Caenorhabditis inopinata with the wasp and bacteria in the fig ecosystem International conference
Ryusei Tanaka, Tanzila Afrin and Taisei Kikuchi
Seventh International Congress of Nematology 2022.5
Event date： 2022.5.1 - 2022.5.6
Presentation type：Poster presentation
-
オオバイヌビワ果実内部の線虫の動態
田中龍聖,Afrin tanzila,菊地泰生
2018 日本線虫学会大会 (熊本) 日本線虫学会
Event date： 2018.9.5 - 2018.9.6
Language：Japanese Presentation type：Oral presentation (general)
Venue：熊本
-
イチジク果実内部に生息する線虫Caenorhabdits sp. 34 の餌としての細菌
田中龍聖・神崎菜摘・菊地泰生
日本線虫学会
Event date： 2016.9.14 - 2016.9.16
Language：Japanese Presentation type：Oral presentation (general)
Grant-in-Aid for Scientific Research 【 display / non-display 】
-
イチジク果実内の生物群の共進化
2016.04 - 2019.03
科学研究費補助金 若手研究(B)
Authorship：Principal investigator