Oryzias latipes

メダカ

関

cyprinodont、japanese medaka、medaka、Oryzias

WordNet

1. any member of the family Cyprinodontidae

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/05/17 09:34:29」(JST)

wiki en

[Wiki en表示]

Japanese rice fish
Oryzias latipes
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Beloniformes
Family:	Adrianichthyidae
Subfamily:	Oryziinae
Genus:	Oryzias
Species:	O. latipes
Binomial name
Oryzias latipes Temminck & Schlegel 1846

For the manga and anime series, see Medaka Box.

The Japanese rice fish (Oryzias latipes), also known as the medaka and Japanese killifish, is a member of genus Oryzias (ricefish), the only genus in the subfamily Oryziinae. This rather small (2–4 cm long) native of Southeast Asia is a common denizen of rice paddies in coastal Asia. It became popular as an aquarium fish because of its hardiness and pleasant coloration: its coloration varies from brown or yellow-gold in the wild to white, creamy yellow, or orange in aquarium-bred individuals. The medaka has been a popular pet since the 17th century in Japan. It is amphidromous, meaning it moves between salt and freshwater at some point in its life. It is found in both ocean and river habitats. The female carries her eggs attached between her anal fins.

Description

Oryzias latipes is a model organism and is extensively used in many areas of biological research, most notably in toxicology. Medaka have a short gestation period and are reproductively prolific — characteristics that make them easy to rear in the laboratory. They can withstand cold and can be shipped easily. Nearly all aspects of the life cycle of medaka have been analyzed by researchers including sexual behavior, genetic inheritance of coloration, spawning habits, feeding, pathology, embryological development, ecology, etc. It has relatively small genome (~800 Mb, half the size of the genome of another popular model fish, the zebrafish) as well as a generation time of 7 weeks (rather than 9 weeks for zebrafish) also hardier growth in a broad temperature range (6–40 degrees °C).

Transgenic medaka are relatively easy to produce. They have been genetically modified to secrete various human hormones, express promoter sequences from other fish, and to make antimicrobial proteins and a protein that makes the medaka glow fluorescent green. There are also many mutations that show up in medaka at random, for example, a mutant strain that lacks scales, and one with extra-long fins. Haploid embryonic stem cell lines have been established.

In space

O. latipes carries the distinction of having been the first vertebrate to mate in orbit. The result of the mating was a brood of healthy fry, hatched on the Space Shuttle Columbia in 1994. O. latipes returned to space in 2012, launched aboard a Soyuz spacecraft Soyuz TMA-06M and housed in an aquarium aboard the International Space Station.

References

External links

• Medaka genome in Ensembl.

English Journal

• Light and electron microscopic analyses of Vasa expression in adult germ cells of the fish medaka.

• Yuan Y1, Li M1, Hong Y2.
• Gene.Gene.2014 Jul 15;545(1):15-22. doi: 10.1016/j.gene.2014.05.017. Epub 2014 May 9.
• Germ cells of diverse animal species have a unique membrane-less organelle called germ plasm (GP). GP is usually associated with mitochondria and contains RNA binding proteins and mRNAs of germ genes such as vasa. GP has been described as the mitochondrial cloud (MC), intermitochondrial cement (IC)
• PMID 24814190

• Comparative analysis of melanoma deregulated miRNAs in the medaka and Xiphophorus pigment cell cancer models.

• Mishra RR1, Kneitz S1, Schartl M2.
• Comparative biochemistry and physiology. Toxicology & pharmacology : CBP.Comp Biochem Physiol C Toxicol Pharmacol.2014 Jun;163:64-76. doi: 10.1016/j.cbpc.2014.01.002. Epub 2014 Jan 22.
• Malignant melanoma is the most aggressive and deadly form of skin cancer, with an almost 100% development of resistance to current therapeutic approaches at progression stages. The incidence of melanoma is steadily increasing worldwide. Although many details leading to the development of malignant m
• PMID 24462553

• Trenbolone acetate metabolites promote ovarian growth and development in adult Japanese medaka (Oryzias latipes).

• Forsgren KL1, Qu S2, Lavado R3, Cwiertny D2, Schlenk D3.
• General and comparative endocrinology.Gen Comp Endocrinol.2014 Jun 1;202C:1-7. doi: 10.1016/j.ygcen.2014.04.011. Epub 2014 Apr 26.
• Trenbolone acetate, a synthetic androgen, has been used as a growth promoter in beef cattle in the US since 1987. While several teleost studies have investigated the masculinization effects of the metabolite 17β-trenbolone, few have focused on the reproductive impacts of all three trenbolone acetat
• PMID 24780119

Japanese Journal

• Current status of genetic disturbances in wild medaka populations (Oryzias latipes species complex) in Japan

• Ichthyological research : an official journal of the Ichthyological Society of Japan 64(1), 116-119, 2017-01-25
• NAID 40021069552

• ミナミメダカ琉球型個体群における他個体群の放流による遺伝的撹乱の初事例

• 日本生物地理学会会報 = Bulletin of the Biogeographical Society of Japan 71, 121-129, 2017-01-20
• NAID 40021069724

• An Approach to Elucidate NBS1 Function in DNA Repair Using Frequent Nonsynonymous Polymorphism in Wild Medaka (Oryzias latipes) Populations

• PLOS ONE 12(1), 2017-01-20
• NAID 120005980875

---

★リンクテーブル★

リンク元	「メダカ」「medaka」「japanese medaka」「cyprinodont」
関連記事	「Oryzias」

「メダカ」

　　[★]

英

medaka、cyprinodont、Oryzias latipes

関

ニホンメダカ、メダカ属

「medaka」

　　[★]

メダカ

関

cyprinodont、japanese medaka、Oryzias、Oryzias latipes

「japanese medaka」

　　[★]

• ニホンメダカ

関

medaka、Oryzias、Oryzias latipes

「cyprinodont」

　　[★]

メダカ

関

medaka、Oryzias latipes

　

「Oryzias」

　　[★]

メダカ属

関

japanese medaka、medaka、Oryzias latipes