SCID mice are routinely used as model organisms for research into the basic biology of the immune system, cell transplantation strategies, and the effects of disease on mammalian systems. They have been extensively used as hosts for normal and malignant tissue transplants. In addition, they are useful for testing the safety of new vaccines or therapeutic agents in immunocompromised individuals.
The condition is due to a rare recessive mutation on Chromosome 16 responsible for deficient activity of an enzyme involved in DNA repair (Prkdc or "protein kinase, DNA activated, catalytic polypeptide"). Because V(D)J recombination does not occur, the humoral and cellular immune systems fail to mature. As a result, SCID mice have an impaired ability to make T or B lymphocytes, may not activate some components of the complement system, and cannot efficiently fight infections, nor reject tumors and transplants.
By crossing SCID mice with mice carrying mutations in related genes, such as interleukin-2Rgamma,[11] more efficient immunocompromised strains can be created to further aid research. The degree to which the various components of the immune system are compromised varies according to what other mutations the mice carry along with the SCID mutation.
https://en.wikipedia.org/wiki/Severe_combined_immunodeficiency_(non-human)#Mice
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