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Phenotypes Associated with This Genotype
Genotype
MGI:2654913
Allelic
Composition
Rag2tm1Cgn/Rag2tm1.1Cgn
Tg(Mx1-cre)1Cgn/0
Genetic
Background
involves: C57BL/6 * CBA
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rag2tm1.1Cgn mutation (4 available); any Rag2 mutation (115 available)
Rag2tm1Cgn mutation (2 available); any Rag2 mutation (115 available)
Tg(Mx1-cre)1Cgn mutation (10 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• the IgM+HSAhigh immature B cell compartment in the spleen is absent two weeks after induction of Cre expression in mice 8-10 weeks old
• B cell development is arrested at the pro-B cell stage two weeks after induction of Cre expression in mice 8-10 weeks old
• T cell development is arrested at the pro-T cell stage two weeks after induction of Cre expression in mice 8-10 weeks old
• the number of mature B cells in the bone marrow drop by half within two weeks of induction of Cre expression in mice 8-10 weeks old and then decline slowly over the next year with a half-life of 156 days
• the number of mature B cells in the spleen is reduced by 67% two weeks after Cre induction
• mature B cell numbers are reduced to 32% in the spleen 17 weeks after Cre induction and remain at this level for at least one year
• mature B cell numbers in lymph nodes drop to 58% of normal 10 weeks after Cre induction, and continue to drop to 11% of normal 17 weeks after Cre induction
• mature B cell numbers remain at 11% of normal between 17 and 54 weeks after induction of Cre expression
• when Cre is induced in neonates, mature B cells numbers are 10- to 30- fold below normal
• the number of follicular B cells in the spleen decline slowly after induction of Cre expression in mice 8-10 weeks old with a half-life of 134 days
• marginal zone B cells are decreased in number by 75% when Cre-induction occurs at birth
• the number of marginal zone B cells increases slightly with age but remains well below normal levels
• marginal zone B cell numbers are normal when Cre-induction occurs in mice 8 to 10 weeks of age
• the total number of IgM secreting plasma cells found in the spleen is 3- to 4- fold larger in mice where Cre induction is induced at birth than in controls
• pre-B cells are absent in the bone marrow of mice two weeks after induction of Cre expression in mice 8-10 weeks old
• peripheral B cells have an activated phenotype in mice that have Cre expression induced at birth
• the activated phenotype include larger cell size and increased expression of CD25, CD69, CD86 and MHC-II when analyzed at 8 weeks of age
• B cells do not have this activated phenotype when Cre is induced in mice 8-10 weeks of age

hematopoietic system
• the IgM+HSAhigh immature B cell compartment in the spleen is absent two weeks after induction of Cre expression in mice 8-10 weeks old
• B cell development is arrested at the pro-B cell stage two weeks after induction of Cre expression in mice 8-10 weeks old
• T cell development is arrested at the pro-T cell stage two weeks after induction of Cre expression in mice 8-10 weeks old
• the number of mature B cells in the bone marrow drop by half within two weeks of induction of Cre expression in mice 8-10 weeks old and then decline slowly over the next year with a half-life of 156 days
• the number of mature B cells in the spleen is reduced by 67% two weeks after Cre induction
• mature B cell numbers are reduced to 32% in the spleen 17 weeks after Cre induction and remain at this level for at least one year
• mature B cell numbers in lymph nodes drop to 58% of normal 10 weeks after Cre induction, and continue to drop to 11% of normal 17 weeks after Cre induction
• mature B cell numbers remain at 11% of normal between 17 and 54 weeks after induction of Cre expression
• when Cre is induced in neonates, mature B cells numbers are 10- to 30- fold below normal
• the number of follicular B cells in the spleen decline slowly after induction of Cre expression in mice 8-10 weeks old with a half-life of 134 days
• marginal zone B cells are decreased in number by 75% when Cre-induction occurs at birth
• the number of marginal zone B cells increases slightly with age but remains well below normal levels
• marginal zone B cell numbers are normal when Cre-induction occurs in mice 8 to 10 weeks of age
• the total number of IgM secreting plasma cells found in the spleen is 3- to 4- fold larger in mice where Cre induction is induced at birth than in controls
• pre-B cells are absent in the bone marrow of mice two weeks after induction of Cre expression in mice 8-10 weeks old
• peripheral B cells have an activated phenotype in mice that have Cre expression induced at birth
• the activated phenotype include larger cell size and increased expression of CD25, CD69, CD86 and MHC-II when analyzed at 8 weeks of age
• B cells do not have this activated phenotype when Cre is induced in mice 8-10 weeks of age


Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO)
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last database update
01/06/2026
MGI 6.24
The Jackson Laboratory