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The genetically modified mouse in which a gene affecting hair growth has been knocked out (left) shown next to a normal lab mouse. A genetically modified mouse, genetically engineered mouse model (GEMM) [1] or transgenic mouse is a mouse (Mus musculus) that has had its genome altered through the use of genetic engineering techniques.
Knocking out a gene also may fail to produce an observable change in a mouse or may even produce different characteristics from those observed in humans in which the same gene is inactivated. For example, mutations in the p53 gene are associated with more than half of human cancers and often lead to tumours in a particular set of tissues ...
For example, the gene encoding insulin-like growth factor 2 (IGF2/Igf2) is only expressed from the allele inherited from the male. Although imprinting accounts for a small proportion of mammalian genes, they play an important role in embryogenesis particularly in the formation of visceral structures and the nervous system. [14]
The laboratory mouse genome has been sequenced and many mouse genes have human homologues. [1] Lab mice are sold at pet stores for snake food and can also be kept as pets . Other mouse species sometimes used in laboratory research include two American species, the white-footed mouse ( Peromyscus leucopus ) and the North American deer mouse ...
The Mouse Genetics Project (MGP) is a large-scale mutant mouse production and phenotyping programme aimed at identifying new model organisms of disease. [1] [2] [3] [4]Based at the Wellcome Trust Sanger Institute, the project uses knockout mice most of which were generated by the International Knockout Mouse Consortium.
A recent study of 900 mouse genes concluded that 42% of them were essential although the selected genes were not representative. [47] Gene knockout experiments are not possible or at least not ethical in humans. However, natural mutations have led to the identification of mutations that lead to early embryonic or later death. [48]
The ob/ob or obese mouse is a mutant mouse that eats excessively due to mutations in the gene responsible for the production of leptin and becomes profoundly obese. It is an animal model of type II diabetes. Identification of the gene mutated in ob led to the discovery of the hormone leptin, which is important in the control of appetite.
A mouse (pl.: mice) 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 (Mus musculus). Mice are also popular as pets. In some places, certain kinds of field mice are locally common. They are ...