Mice homozygous for the Cd8atm1Mak targeted mutation are deficient in functional cytotoxic T-cells; however helper T-cell development and function is comparable to normal. NOD.129S2(B6)-Cd8atm1Mak/DvsJ mice are homozygous for linkage markers delineating all known Idd loci of NOD origin and strongly diabetes resistant (1/17 females are diabetic by 30 weeks of age). Survival of allogeneic skin grafts in NOD.129S2(B6)-Cd8atm1Mak/DvsJ mice treated with an anti-Cd40 ligand specific mAb and donor specific transfusion (DST) is significantly shorter (MST=21days) than in B6.129S2-Cd8atm1Mak/J (MST=101days) and (NODXB6)F1-Cd8atm1Mak (MST=35days) mice. Homozygous mutant mice are strongly, but not completely diabetes resistant (<3% in females) and insulitis is strongly, but not completely repressed.
This model is useful for sorting out the genetic mechanism(s) involved in transplant tolerance and for studying the role of Cd8a in diabetes research.
Using marker assisted analysis for all known Idd loci, B6.129S2-Cd8atm1Mak/J at N13 from The Jackson Laboratory's Induced Mutant Resource (Stock #002665) was backcrossed to NOD/Lt for 10 generations, prior to intercrossing to generate homozygotes (Pearson et al, 2003). In 2005, NOD.129S2(B6)-Cd8atm1Mak/Dvs homozygous strain at N9F11 was transferred from David Serreze's research colony to the Type 1 Diabetes Resource at The Jackson Laboratory.
|Allele Name||targeted mutation 1, Tak Mak|
|Allele Type||Targeted (Null/Knockout)|
|Allele Synonym(s)||CD8 KO; CD8-; CD8-KO; CD8KO; CD8alpha-; CD8alpha-; Cd8atm1Mak; Lyt-2-|
|Gene Symbol and Name||Cd8a, CD8 antigen, alpha chain|
|Gene Synonym(s)||BB154331; CD8; Leu2; Ly-2; Ly-2; Ly-35; Ly-35; Ly-B; Lyt-2; Lyt-2; MAL; T-lymphocyte antigen 2; expressed sequence BB154331; lymphocyte antigen 2; lymphocyte antigen 35; p32|
|Strain of Origin||129S2/SvPas|
|Molecular Note||A neomycin resistance gene was inserted into exon 1. Flow cytometry analysis on thymus and lymph node cells derived from homozygous mice confirmed that no detectable encoded protein was expressed on the cell surface.|
|Mutations Made By|| |
Dr. Tak Mak, University Health Network/Un of Toronto
When using the NOD.CD8a<sup>null</sup> mouse strain in a publication, please cite the originating article(s) and include JAX stock #005513 in your Materials and Methods section.
|Homozygous for Cd8a<tm1Mak>|
The average number of mice provided from recovery of our cryopreserved strains is 10. The total number of animals provided,
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