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Phenotypes Associated with This Genotype
Genotype
MGI:4453800
Allelic
Composition		 Cd79btm1Mnz/Cd79btm1Mnz
Tg(IghelMD4)4Ccg/0
Tg(Rag2-Igb)1Mnz/0
Genetic
Background		 involves: 129S1/Sv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cd79btm1Mnz mutation (0 available); any Cd79b mutation (35 available)
Tg(IghelMD4)4Ccg mutation (16 available)
Tg(Rag2-Igb)1Mnz mutation (0 available)
♀ phenotype observed in females
♂ phenotype observed in males
N normal phenotype
hematopoietic system
abnormal immature B cell morphology ( J:78601 )
• increase in apoptosis of immature B cells
arrested B cell differentiation ( J:78601 )
• B cells fail to develop beyond the IgMlow immature B cell stage and no mature recirculating CD25-IgMhigh B cells are seen

immune system
abnormal immature B cell morphology ( J:78601 )
• increase in apoptosis of immature B cells
arrested B cell differentiation ( J:78601 )
• B cells fail to develop beyond the IgMlow immature B cell stage and no mature recirculating CD25-IgMhigh B cells are seen

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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Send questions and comments to User Support. 		last database update
01/13/2026
MGI 6.24 		The Jackson Laboratory