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Phenotypes Associated with This Genotype
Genotype
MGI:3032926
Allelic
Composition
Fasltm1.1Lest/Fasltm1.1Lest
Genetic
Background
involves: 129 * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fasltm1.1Lest mutation (1 available); any Fasl mutation (35 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• reduced survival due to massive lymphoproliferation and autoimmune disease
• greater than 50% died by 4 months
• 85% had died by 7 months

endocrine/exocrine glands
• lymphocytic infiltration

hematopoietic system
• more accelerated and pronounced than in homozygous Tnfsf6gld mice on a C57BL/6 genetic background
• abnormal CD3+B220+CD4-CD8- T cells represented 70% to 87% of the cells that accumulated in the spleen and lymph nodes at 12 to 13 weeks of age
• hypergammaglobulinemia
• significantly higher than those observed in wild-type controls and in homozygous Tnfsf6gld mice

homeostasis/metabolism
• observed in most mice with a mixed genetic background involving 129/Sv and C57BL/6 as well as in incipient congenic mice (backcrossed to C57BL/6 for 5 generations)

immune system
• more accelerated and pronounced than in homozygous Tnfsf6gld mice on a C57BL/6 genetic background
• abnormal CD3+B220+CD4-CD8- T cells represented 70% to 87% of the cells that accumulated in the spleen and lymph nodes at 12 to 13 weeks of age
• hypergammaglobulinemia
• significantly higher than those observed in wild-type controls and in homozygous Tnfsf6gld mice
• lymphadenopathy associated with lymphocytic infiltration into multiple organs
• more accelerated and pronounced than in homozygous Tnfsf6gld mice on a C57BL/6 genetic background
• lymphoproliferation of both normal B and T cells as well as abnormal double negative T cells in spleen and lymph nodes
• observed in most mice with a mixed genetic background involving 129/Sv and C57BL/6 as well as in incipient congenic mice (backcrossed to C57BL/6 for 5 generations)

liver/biliary system
• associated with moderate to severe lymphocytic infiltration

renal/urinary system
• observed in most mice with a mixed genetic background involving 129/Sv and C57BL/6 as well as in incipient congenic mice (backcrossed to C57BL/6 for 5 generations)
• observed in most mice with a mixed genetic background involving 129/Sv and C57BL/6 as well as in incipient congenic mice (backcrossed to C57BL/6 for 5 generations)

digestive/alimentary system
• lymphocytic infiltration

growth/size/body
• associated with moderate to severe lymphocytic infiltration
• more accelerated and pronounced than in homozygous Tnfsf6gld mice on a C57BL/6 genetic background


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
01/28/2026
MGI 6.24
The Jackson Laboratory