Mice homozygous for the Rag1tm1Mom mutation produce no mature T cells or B cells, and data suggest that B cell and T cell development has been arrested at an early stage.
Peter Mombaerts, Max Planck Research Unit for Neurogenetics
Mice homozygous for the Rag1tm1Mom mutation produce no mature T cells or B cells. Their phenotype can be described as a "non-leaky" severe combined immune deficiency (Prkdcscid/Prkdcscid) (Prkdcscid mice produce some B cells and IgM). They have no CD3+ or T cell receptor (TCR) alpha-beta positive cells. The thymus of the mutant mice contains 15 to 130 times fewer cells than heterozygous or wildtype siblings. The thymocytes are CD8-CD4- and most are IL2 receptor positive. Neither the spleen nor bone marrow contain any IgM or IgD staining cells, indicating an absence of mature B cells. These and other data suggest that B cell and T cell development has been arrested at an early stage. Macroscopically, the mutants are indistinguishable from heterozygotes or normal wildtype siblings.
|Allele Name||targeted mutation 1, Peter Mombaerts|
|Allele Type||Targeted (Null/Knockout)|
|Allele Synonym(s)||Rag1tm1Mom; targeted mutation 1, Peter Mombaerts|
|Gene Symbol and Name||Rag1, recombination activating gene 1|
|Gene Synonym(s)||Rag-1; RAG-1; RNF74; Rag-1|
|Site of Expression||expression is seen in bone marrow derived cell lines.|
|Strain of Origin||129S7/SvEvBrd-Hprt+|
|Molecular Note||A 1356 bp genomic fragment of the Rag1 gene, encoding the nuclear localization signal and the zinc-finger motif, was replaced by a neomycin cassette. A mutant transcript expressed from this allele was detected by Northern blot in bone marrow derived cell lines from homozygous mice.|
|Mutations Made By|| |
Peter Mombaerts, Max Planck Research Unit for Neurogenetics
This Rag1tm1Mom strain is maintained by mating homozygous siblings. This strain should be housed under pathogen free conditions similar to Prkdcscid/Prkdcscid mice or any other immunodeficient strain. Only homozygous mice may be ordered. Expected coat color from breeding:White Bellied Agouti
When using the RAG-1- mouse strain in a publication, please cite the originating article(s) and include JAX stock #002096 in your Materials and Methods section.
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