User:HirokiTomida/Japanese rice fish
Conservation status of Medaka
[edit]Medaka is categorized to be endangered species by ministry of environment in Japan[1]. There are two major conservational concerns about Medaka, habitat degradation and hybridization with domesticated Medaka(Himedaka). Due to modernization of rice field and irrigation canal, the optimal place for Medaka's reproduction is massively decreased[2]. In addition, recent studies confirmed that Himedaka was introduced into many local regions by artificial release. This will leads eliminate local genetic adaptation of each sub-population of Medaka[3][4]. Furthermore, Since Himedaka has vivid orange body color, the hybrid will attract more predators and decrease the total population of Medaka[5]. In 2011, the researchers discovered that almost 15% of wild caught Medaka in Nara had Himedaka specific gene marker.[6]. In addition to these concerns, invasive species like mosquitofish conflicts with Medaka by sharing same habitat. The study reports over 70% Medaka was injured their tail fin by attack from Mosquitofish[7]. The damage at anal fin will decrease fertility rate[8]. There is no comprehensive study of population size of Medaka. But the genetic analysis of one sub-population of Medaka indicates that their effective population size is around 25000-70000[9].
Use in science
[edit]Inbreeding lines
[edit]Medaka is relatively easy to establish inbred lines[10]. Since 1979, the researchers generated 10 inbred strains[11]. This inbred lines make genetic research easier[12][13].The researchers also plan to generate 200 inbred lines from single population[14].
Understanding Sex and Reproduction by Medaka
[edit]Medaka is first non-mammal vertebrate species that sex-determination gene(dmy) was identified[15] and their sex is reversible by sex steroid manipulation[16]. Moreover, the characteristics of Medaka that reproduce daily basis is optimal trait to study reproductive biology and sexual dimorphism and some tools such as ovariectomy[17] and changing light-dark cycle[18]. Since Medaka produce eggs everyday, it is also desirable to measure HPG axis activities[19][20].
Taxonomy and range
[edit]Origin of Southern＆ Northern Population
[edit]Phylogenetic analysis shows that the southern population was derived from Northern Kyushu area and spread into Honshu island. On the other hand, Northern population was derived from Tango and spread alongside with Japan sea coast[21].
- ^ Takehana, Yusuke; Nagai, Naoko; Matsuda, Masaru; Tsuchiya, Kimiyuki; Sakaizumi, Mitsuru (2003/10). "Geographic Variation and Diversity of the Cytochrome b Gene in Japanese Wild Populations of Medaka, Oryzias latipes". Zoological Science. 20 (10): 1279–1291. doi:10.2108/zsj.20.1279. ISSN 0289-0003.
{{cite journal}}: Check date values in:|date=(help) - ^ 牧人, 小林; 知尚, 頼経; 翔平, 鈴木; 彩美, 清水; 美香, 小井土; 優太郎, 川口; 洋一, 早川; さやか, 江口; 弘文, 横田; 義和, 山本 (2012). "屋外池における野生メダカ Oryzias latipes の繁殖行動". 日本水産学会誌. 78 (5): 922–933. doi:10.2331/suisan.78.922.
- ^ Nakao, Ryohei; Iguchi, Yuka; Koyama, Naoto; Nakai, Koji; Kitagawa, Tadao (2017-01-01). "Current status of genetic disturbances in wild medaka populations (Oryzias latipes species complex) in Japan". Ichthyological Research. 64 (1): 116–119. doi:10.1007/s10228-016-0528-5. ISSN 1616-3915.
- ^ 直人, 小山; 幹大, 森; 宏施, 中井; 忠生, 北川 (2011). "市販されているメダカのミトコンドリアdna 遺伝子構成". 魚類学雑誌. 58 (1): 81–86. doi:10.11369/jji.58.81.
- ^ Nakao, Ryohei; Kitagawa, Tadao (2015). "Differences in the behavior and ecology of wild type medaka (Oryzias latipes complex) and an orange commercial variety (himedaka)". Journal of Experimental Zoology Part A: Ecological Genetics and Physiology. 323 (6): 349–358. doi:10.1002/jez.1916. ISSN 1932-5231.
- ^ 宏施, 中井; 遼平, 中尾; 昌司, 深町; 直人, 小山; 忠生, 北川 (2011). "ヒメダカ体色原因遺伝子マーカーによる奈良県大和川水系のメダカ集団の解析". 魚類学雑誌. 58 (2): 189–193. doi:10.11369/jji.58.189.
- ^ 優秋, 田代; 康則, 上月; 陽一, 佐藤; 仁士, 村上 (2005). "外来種カダヤシによるメダカへの影響と保全策に関する一考察". 日本生態学会大会講演要旨集. ESJ52: 814–814. doi:10.14848/esj.ESJ52.0.814.0.
- ^ 珠央, 伊藤; 右介, 小関; 靖章, 新妻 (2006). "メダカOryzias latipesにおける雄の鰭の損傷による産卵数および受精率の低下". 野生生物保護. 10 (1–2): 1–7. doi:10.20798/wildlifeconsjp.10.1-2_1.
- ^ Spivakov, Mikhail; Auer, Thomas O.; Peravali, Ravindra; Dunham, Ian; Dolle, Dirk; Fujiyama, Asao; Toyoda, Atsushi; Aizu, Tomoyuki; Minakuchi, Yohei; Loosli, Felix; Naruse, Kiyoshi (2014-03-01). "Genomic and Phenotypic Characterization of a Wild Medaka Population: Towards the Establishment of an Isogenic Population Genetic Resource in Fish". G3: Genes, Genomes, Genetics. 4 (3): 433–445. doi:10.1534/g3.113.008722. ISSN 2160-1836. PMID 24408034.
- ^ Hilgers, Leon; Schwarzer, Julia. "The untapped potential of medaka and its wild relatives". eLife. 8. doi:10.7554/eLife.46994. ISSN 2050-084X. PMC 6615862. PMID 31287418.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ "NBRP Medaka". shigen.nig.ac.jp. Retrieved 2019-10-07.
- ^ Kasahara, Masahiro; Naruse, Kiyoshi; Sasaki, Shin; Nakatani, Yoichiro; Qu, Wei; Ahsan, Budrul; Yamada, Tomoyuki; Nagayasu, Yukinobu; Doi, Koichiro; Kasai, Yasuhiro; Jindo, Tomoko (2007-06). "The medaka draft genome and insights into vertebrate genome evolution". Nature. 447 (7145): 714–719. doi:10.1038/nature05846. ISSN 1476-4687.
{{cite journal}}: Check date values in:|date=(help) - ^ Kimura, Tetsuaki; Shimada, Atsuko; Sakai, Noriyoshi; Mitani, Hiroshi; Naruse, Kiyoshi; Takeda, Hiroyuki; Inoko, Hidetoshi; Tamiya, Gen; Shinya, Minori (2007-12-01). "Genetic Analysis of Craniofacial Traits in the Medaka". Genetics. 177 (4): 2379–2388. doi:10.1534/genetics.106.068460. ISSN 0016-6731. PMID 18073435.
- ^ Kirchmaier, Stephan; Naruse, Kiyoshi; Wittbrodt, Joachim; Loosli, Felix (2015-04-01). "The Genomic and Genetic Toolbox of the Teleost Medaka (Oryzias latipes)". Genetics. 199 (4): 905–918. doi:10.1534/genetics.114.173849. ISSN 0016-6731. PMID 25855651.
- ^ Matsuda, Masaru; Nagahama, Yoshitaka; Shinomiya, Ai; Sato, Tadashi; Matsuda, Chika; Kobayashi, Tohru; Morrey, Craig E.; Shibata, Naoki; Asakawa, Shuichi; Shimizu, Nobuyoshi; Hori, Hiroshi (2002-05). "DMY is a Y-specific DM-domain gene required for male development in the medaka fish". Nature. 417 (6888): 559–563. doi:10.1038/nature751. ISSN 1476-4687.
{{cite journal}}: Check date values in:|date=(help) - ^ Scholz, S; Gutzeit, H. O (2000-10-01). "17-α-ethinylestradiol affects reproduction, sexual differentiation and aromatase gene expression of the medaka (Oryzias latipes)". Aquatic Toxicology. 50 (4): 363–373. doi:10.1016/S0166-445X(00)00090-4. ISSN 0166-445X.
- ^ Kanda, Shinji; Akazome, Yasuhisa; Matsunaga, Takuya; Yamamoto, Naoyuki; Yamada, Shunji; Tsukamura, Hiroko; Maeda, Kei-ichiro; Oka, Yoshitaka (2008-05-01). "Identification of KiSS-1 Product Kisspeptin and Steroid-Sensitive Sexually Dimorphic Kisspeptin Neurons in Medaka (Oryzias latipes)". Endocrinology. 149 (5): 2467–2476. doi:10.1210/en.2007-1503. ISSN 0013-7227.
- ^ Weber, D. N.; Spieler, R. E. (1987-06-01). "Effects of the light-dark cycle and scheduled feeding on behavioral and reproductive rhythms of the cyprinodont fish, Medaka,Oryzias latipes". Experientia. 43 (6): 621–624. doi:10.1007/BF02126355. ISSN 1420-9071.
- ^ Karigo, Tomomi; Kanda, Shinji; Takahashi, Akiko; Abe, Hideki; Okubo, Kataaki; Oka, Yoshitaka (2012-07-01). "Time-of-Day-Dependent Changes in GnRH1 Neuronal Activities and Gonadotropin mRNA Expression in a Daily Spawning Fish, Medaka". Endocrinology. 153 (7): 3394–3404. doi:10.1210/en.2011-2022. ISSN 0013-7227.
- ^ Kanda, Shinji (2018-11-27). "Evolution of the regulatory mechanisms for the hypothalamic-pituitary-gonadal axis in vertebrates–hypothesis from a comparative view". General and Comparative Endocrinology. doi:10.1016/j.ygcen.2018.11.014. ISSN 0016-6480.
- ^ Katsumura, Takafumi; Oda, Shoji; Mitani, Hiroshi; Oota, Hiroki (2019-01-01). "Medaka Population Genome Structure and Demographic History Described via Genotyping-by-Sequencing". G3: Genes, Genomes, Genetics. 9 (1): 217–228. doi:10.1534/g3.118.200779. ISSN 2160-1836. PMID 30482798.