Japanese house mouse | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Rodentia |
Family: | Muridae |
Genus: | Mus |
Species: | |
Subspecies: | M. m. molossinus |
Trinomial name | |
Mus musculus molossinus Temminck, 1845 |
The Japanese house mouse or Japanese wild mouse (Mus musculus molossinus) is a type of house mouse that originated in Japan. Genetically, it is a hybrid between the southeastern Asian house mouse ( M. m. castaneus ) and the eastern European house mouse ( M. m. musculus ). It is thus not a unique subspecies, but is treated as such for its characteristic features. [1] It is among the smallest house mice. Different strains such as MSM/Ms, JF1, Japanese waltzing mouse, C57BL/6J and MSKR exist following cross breeding with other house mice, and are used in different genetic and medical investigations.
The adults can be easily distinguished from common laboratory mice from their size and body colours. They are slightly smaller, and they have characteristic two-coloured body, agouti with white bellies. [2] The two colours are not marked by a distinct margin but fused as the colour fades. The tail is also bi-coloured, white with a black tip. Adult females measure 8.1 cm in length without tail, much larger than males, which are 7.2 cm without the tail. Their tails can be up to 13.8 cm long for males, and 16.2 cm for females. [3]
Based on classical taxonomy, the Japanese house mouse was first described by Dutch zoologist Coenraad Jacob Temminck as a unique species, Mus molossinus in 1845 from a specimen discovered in Nagasaki. [3] The Japanese zoologist Nagamichi Kuroda adopted this classification in 1940 to describe many species of house mice including subspecies under the species. [4] German zooligists Ernst Schwarz and Henriette K. Schwarz redescribed it as a subspecies under Mus musculus in 1943. [3] The subspecies status was used as valid classification. In 1981, an American zoologist Joe Truesdell Marshall revised Kuroda's taxonomy and merged all subspecies under M. molossinus into the subspecies M. m. molossinus. [5] In 1988, Japanese researchers found that the subspecies is not unique as they are the products of natural hybridisation between other mice subspecies, [6] although they are still treated as subspecies. [7]
Genetic analysis of the mitochondrial DNA in 1988 revealed that Japanese house mice originated from gene mixing (hybridisation) between southeastern Asian house mouse and the eastern European house mouse. [6] Further genetic studies supported this finding. Analysis of nuclear genome shows that hybridisation mainly occurred at intersection of the northern and southern regions of the Japanese mainland, and the Japanese wild mouse was created at the eastern region of the hybridisation zone. [8] The southeastern Asian house mouse appeared to have inhabited Japan first. It is possible that these mice arrived from the northern side of the island. The eastern European house mouse then invaded Japanese mainland from the southern end, and gradually progressed towards the northern region. [9] The southeastern Asian house mouse could have arrived sometime in 1-1.5 B.C.E from Yunnan, southern China; while the eastern European house mouse arrived a little after 1 B.C.E. [10]
The standard name is an abbreviation MISHIMA/Mishima designating the place of its origin, Mishima, a city of Shizuoka Prefecture, Japan, as first described in 2009. [11] It is an inbred strain that is widely used in the study of genetic linkage for its old genetic divergence from the original house mouse about 1 million years ago. In addition, its unique biological features make it a model animal in other genetic and disease investigations. It is smaller than other laboratory mice and exhibits high locomotor activity. [12] It is also resistant to experimentally induced high-fat-diet diabetes, age-onset hearing loss, inflammation, and carcinogenesis. [1] It is also used in stem cell research using it cell line called ES. [13]
This is another inbred strain that is popularly used as a fancy mouse. Genome analysis shows that JF1 emerged as a reproductive fusion (introgression) of M. m. molossinus into European house mouse (M. m. domesticus). [14] It was first described in 1998 when it was identified to have a recessive piebald (s) allele. [15] Genome analysis indicates that it was domesticated in Japan in the 18th century and was introduced to Europe in the second half of the 19th century. It became one of the main animal models in genetics in America in the early 20th century. [14]
This is also a Japanese fancy mouse but an outbred strain in Europe. It is one of the first models used to test Mendelian inheritance by cross-breeding with other house mice. Its name is given for its habit of running around in the cage as in waltz. The first demonstration of Mendel's laws in animals was published by a British zoologist Arthur Dukinfield Darbishire in 1904 using this strain. [16] It was from this research that the British scientist J. B. S. Haldane was inspired to conduct an experiment and first demonstrated genetic linkage in mammals in 1915 with the help of his sister Naomi and a friend Alexander Dalzell Sprunt. [17] [18] In the early 20th century, the mouse was an ideal model for production of different coat and eye colours, including fancy race mice, based on Mendelian genetics. [19] The strain is closely related to JF1 and genome analysis suggests that it was created from cross-breeding the JF1 with European house mouse (fancy mouse) in the 19th century. [14]
This black coloured mouse is a sub-strain of C57BL/6 created in 1921 by C. C. Little at the Bussey Institute for Research in Applied Biology. It is used widely in genetics, toxicology and as pet. [20] The majority of the genome is from M. m. domesticus, while smaller portion is of M. m. molossinus. [21]
This strain was established in 1998 from Kansai region. It has genetic similarity to C57BL/6N, and generally differs from other inbred stains. [22] It has been used as a model in the study of tawny coat colouration [23] and immunology. [24]
A mouse is a small rodent. Characteristically, mice are known to have a pointed snout, small rounded ears, a body-length scaly tail, and a high breeding rate. The best known mouse species is the common house mouse. Mice are also popular as pets. In some places, certain kinds of field mice are locally common. They are known to invade homes for food and shelter.
Inbred strains are individuals of a particular species which are nearly identical to each other in genotype due to long inbreeding. A strain is inbred when it has undergone at least 20 generations of brother x sister or offspring x parent mating, at which point at least 98.6% of the loci in an individual of the strain will be homozygous, and each individual can be treated effectively as clones. Some inbred strains have been bred for over 150 generations, leaving individuals in the population to be isogenic in nature. Inbred strains of animals are frequently used in laboratories for experiments where for the reproducibility of conclusions all the test animals should be as similar as possible. However, for some experiments, genetic diversity in the test population may be desired. Thus outbred strains of most laboratory animals are also available, where an outbred strain is a strain of an organism that is effectively wildtype in nature, where there is as little inbreeding as possible.
The house mouse is a small mammal of the order Rodentia, characteristically having a pointed snout, large rounded ears, and a long and almost hairless tail. It is one of the most abundant species of the genus Mus. Although a wild animal, the house mouse has benefited significantly from associating with human habitation to the point that truly wild populations are significantly less common than the semi-tame populations near human activity.
The laboratory mouse or lab mouse is a small mammal of the order Rodentia which is bred and used for scientific research or feeders for certain pets. Laboratory mice are usually of the species Mus musculus. They are the most commonly used mammalian research model and are used for research in genetics, physiology, psychology, medicine and other scientific disciplines. Mice belong to the Euarchontoglires clade, which includes humans. This close relationship, the associated high homology with humans, their ease of maintenance and handling, and their high reproduction rate, make mice particularly suitable models for human-oriented research. The laboratory mouse genome has been sequenced and many mouse genes have human homologues. Lab mice are sold at pet stores for snake food and can also be kept as pets.
Mary Frances Lyon was an English geneticist best known for her discovery of X-chromosome inactivation, an important biological phenomenon.
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Mus musculus domesticus, the Western European house mouse, is a subspecies of the house mouse. Some laboratory mouse strains, such as C57BL/6, are domesticated from M. m. domesticus.
The genus Mus or typical mice refers to a specific genus of muroid rodents, all typically called mice, though the term can be used for other rodents. They are the only members of the tribe Murini. However, the term mouse can also be applied to species outside of this genus.
C57BL/6, often referred to as "C57 black 6", "B6", "C57" or "black 6", is a common inbred strain of laboratory mouse.
Dr. Alexander Bachmanov studied veterinary medicine at the Saint Petersburg Veterinary Institute, Russia (1977-1982), received his Ph.D. in biological sciences from the Pavlov Institute of Physiology in Saint Petersburg, Russia in 1990. He completed postdoctoral fellowships at the Physiological Laboratory at Cambridge University in 1993 and at the Monell Chemical Senses Center, Philadelphia, Pennsylvania, in the United States from 1994 to 1997. He later joined Monnell's faculty.
A genetically modified mouse or genetically engineered mouse model (GEMM) is a mouse that has had its genome altered through the use of genetic engineering techniques. Genetically modified mice are commonly used for research or as animal models of human diseases and are also used for research on genes. Together with patient-derived xenografts (PDXs), GEMMs are the most common in vivo models in cancer research. Both approaches are considered complementary and may be used to recapitulate different aspects of disease. GEMMs are also of great interest for drug development, as they facilitate target validation and the study of response, resistance, toxicity and pharmacodynamics.
A recombinant inbred strain or recombinant inbred line (RIL) is an organism with chromosomes that incorporate an essentially permanent set of recombination events between chromosomes inherited from two or more inbred strains. F1 and F2 generations are produced by intercrossing the inbred strains; pairs of the F2 progeny are then mated to establish inbred strains through long-term inbreeding.
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Abbie E. C. Lathrop was a rodent fancier who bred fancy mice and inbred strains for animal models, particularly for research on development and hereditary properties of cancer.
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