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タイトル: Loss of olfaction in sea snakes provides new perspectives on the aquatic adaptation of amniotes
著者: Kishida, Takushi
Go, Yasuhiro
Tatsumoto, Shoji
Tatsumi, Kaori
Kuraku, Shigehiro
Toda, Mamoru
著者名の別形: 岸田, 拓士
郷, 康広
辰本, 将司
辰見, 香織
工樂, 樹洋
戸田, 守
キーワード: OR
V1R
V2R
TAAR
amphibious
fully aquatic
発行日: 4-Sep-2019
出版者: Royal Society
誌名: Proceedings of the Royal Society B: Biological Sciences
巻: 286
号: 1910
論文番号: 20191828
抄録: Marine amniotes, a polyphyletic group, provide an excellent opportunity for studying convergent evolution. Their sense of smell tends to degenerate, but this process has not been explored by comparing fully aquatic species with their amphibious relatives in an evolutionary context. Here, we sequenced the genomes of fully aquatic and amphibious sea snakes and identified repertoires of chemosensory receptor genes involved in olfaction. Snakes possess large numbers of the olfactory receptor (OR) genes and the type-2 vomeronasal receptor (V2R) genes, and expression profiling in the olfactory tissues suggests that snakes use the ORs in the main olfactory system (MOS) and the V2Rs in the vomeronasal system (VNS). The number of OR genes has decreased in sea snakes, and fully aquatic species lost MOS which is responsible for detecting airborne odours. By contrast, sea snakes including fully aquatic species retain a number of V2R genes and a well-developed VNS for smelling underwater. This study suggests that the sense of smell also degenerated in sea snakes, particularly in fully aquatic species, but their residual olfactory capability is distinct from that of other fully aquatic amniotes. Amphibious species show an intermediate status between terrestrial and fully aquatic snakes, implying their importance in understanding the process of aquatic adaptation.
記述: ウミヘビ類のゲノム解読に成功 --海洋環境への適応進化の分子的基盤を探る--. 京都大学プレスリリース. 2019-09-11.
著作権等: This is the accepted manuscript of the article, which has been published in final form at https://doi.org/10.1098/rspb.2019.1828
This is not the published version. Please cite only the published version.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/244023
DOI(出版社版): 10.1098/rspb.2019.1828
PubMed ID: 31506057
関連リンク: https://www.kyoto-u.ac.jp/ja/research-news/2019-09-11-1
出現コレクション:学術雑誌掲載論文等

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