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Phenotypes Associated with This Genotype
Genotype
MGI:3701079
Allelic
Composition
Ightm1(PAX5)Mbu/Ightm1(PAX5)Mbu
Genetic
Background
B6.Cg-Ightm1(PAX5)Mbu
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm1(PAX5)Mbu mutation (0 available); any Igh mutation (47 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• ~50% of homozygotes die within 4.4 months with only ~5.9% surviving to 10 months as result of development of lymphomas

cardiovascular system
• extensive tumor infiltrates are found in the heart in moribund mice

digestive/alimentary system
• extensive tumor infiltrates are seen in salivary glands in moribund mice

endocrine/exocrine glands
• extensive tumor infiltrates are seen in salivary glands in moribund mice
• complete disruption of normal architecture by monomorphic population of medium-sized lymphoid cells
• tumor cells are found outside the capsule
• majority of moribund mice have a huge thymus
• cellularity is reduced to ~33% of wild-type level
• most tumor cells are CD4+CD8+ with varying contribution by CD8 single positive cells
• in 20% of moribund mice, lymphoma cells in bone marrow and peripheral lymphoid organs consist of CD8 single positive T cells while lymphoma cells in thymus are primarily double positive T cells

hematopoietic system
• complete disruption of normal architecture by monomorphic population of medium-sized lymphoid cells
• tumor cells are found outside the capsule
• majority of moribund mice have a huge thymus
• cellularity is reduced to ~33% of wild-type level
• most tumor cells are CD4+CD8+ with varying contribution by CD8 single positive cells
• in 20% of moribund mice, lymphoma cells in bone marrow and peripheral lymphoid organs consist of CD8 single positive T cells while lymphoma cells in thymus are primarily double positive T cells
• under non-competitive conditions, pro-B cell compartment is increased 2-fold relative to wild-type mice
• B cell numbers normalize at later developmental stages
• T-cell development is partially blocked at the earliest pro-T cell stage
• absolute numbers are lower than in heterozygotes and significantly lower than in wild-type
• absolute numbers are lower than in heterozygotes and significantly lower than in wild-type
• complete disruption of normal architecture by monomorphic population of medium-sized lymphoid cells
• all diseased mice show splenomegaly

immune system
• complete disruption of normal architecture by monomorphic population of medium-sized lymphoid cells
• tumor cells are found outside the capsule
• majority of moribund mice have a huge thymus
• cellularity is reduced to ~33% of wild-type level
• most tumor cells are CD4+CD8+ with varying contribution by CD8 single positive cells
• in 20% of moribund mice, lymphoma cells in bone marrow and peripheral lymphoid organs consist of CD8 single positive T cells while lymphoma cells in thymus are primarily double positive T cells
• under non-competitive conditions, pro-B cell compartment is increased 2-fold relative to wild-type mice
• B cell numbers normalize at later developmental stages
• T-cell development is partially blocked at the earliest pro-T cell stage
• absolute numbers are lower than in heterozygotes and significantly lower than in wild-type
• absolute numbers are lower than in heterozygotes and significantly lower than in wild-type
• complete disruption of normal architecture by monomorphic population of medium-sized lymphoid cells
• all diseased mice show splenomegaly
• complete disruption of normal architecture by monomorphic population of medium-sized lymphoid cells
• tumor cells are found outside the capsule
• all diseased mice show lymphadenopathy

liver/biliary system
• extensive tumor infiltrates are found in the liver in moribund mice

renal/urinary system
• extensive tumor infiltrates are found in kidneys of moribund mice

respiratory system
• extensive tumor infiltrates are found in lungs in moribund mice

neoplasm
• mice develop disseminated lymphoma with complete penetrance by 10 months
• most tumor cells are CD4+CD8+ with varying contribution by CD8 single positive cells
• in 20% of moribund mice, lymphoma cells in bone marrow and peripheral lymphoid organs consist of CD8 single positive T cells while lymphoma cells in thymus are primarily double positive T cells

growth/size/body
• all diseased mice show splenomegaly


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