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The first recorded knockout mouse was created by Mario R. Capecchi, Martin Evans, and Oliver Smithies in 1989, for which they were awarded the 2007 Nobel Prize in Physiology or Medicine. Aspects of the technology for generating knockout mice, and the mice themselves have been patented in many countries by private companies.
A knockout mouse (left) that is a model of obesity, compared with a normal mouse. Knockouts are primarily used to understand the role of a specific gene or DNA region by comparing the knockout organism to a wildtype with a similar genetic background. [citation needed]
Gene knock-in originated as a slight modification of the original knockout technique developed by Martin Evans, Oliver Smithies, and Mario Capecchi.Traditionally, knock-in techniques have relied on homologous recombination to drive targeted gene replacement, although other methods using a transposon-mediated system to insert the target gene have been developed. [3]
The International Knockout Mouse Consortium (IKMC) is a scientific endeavour to produce a collection of mouse embryonic stem cell lines that together lack every gene in the genome, and then to distribute the cells to scientific researchers to create knockout mice to study.
The effect of these gene knockouts appeared due to faulty leukocyte function and other causes leading to a breakdown in the innate immune response. The functions of the human FPR1 receptor may be equivalent to the overlapping functions of the mouse Fpr1 and Fpr2 functions and therefore be critical in the defense against at least certain bacteria.
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.
A MARCH1 knockout mouse shows accumulation of MHC II, which leads to reduced CD4 + T lymphocyte activation and reduced IL-12 production. [17] Conversely, a CD83 knockout mouse shows a reduction of MHC II and CD86 , better response to bacterial infection, and higher production of IL-12 than in the wild type.
The International Mouse Phenotyping Consortium (IMPC) is an international scientific endeavour to create and characterize the phenotype of 20,000 knockout mouse strains. [1] [2] [3] Launched in September 2011, [1] the consortium consists of over 15 research institutes across four continents with funding provided by the NIH, European national governments and the partner institutions.