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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Ltbtm1Avt
targeted mutation 1, Alexei V Tumanov
MGI:2388016
Summary 2 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
cn1
Cd19tm1(cre)Cgn/Cd19+
Ltbtm1Avt/Ltbtm1Avt
involves: 129P2/OlaHsd * C57BL/6 MGI:3768340
cn2
Cd19tm1(cre)Cgn/Cd19+
Ltbtm1Avt/Ltbtm1Avt
Tg(Lck-cre)1Jtak/?
involves: 129P2/OlaHsd * C57BL/6 MGI:3768341


Genotype
MGI:3768340
cn1
Allelic
Composition
Cd19tm1(cre)Cgn/Cd19+
Ltbtm1Avt/Ltbtm1Avt
Genetic
Background
involves: 129P2/OlaHsd * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cd19tm1(cre)Cgn mutation (11 available); any Cd19 mutation (60 available)
Ltbtm1Avt mutation (0 available); any Ltb mutation (19 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• following immunization, fewer peanut agglutinin positive (PNA+) clusters are present and very few IgD- areas typical of germinal centers are identified
• B cell follicle disruption is not as severe as in Ltb null mice
• however, some follicular dendritic cells are present and immune complex binding is observed
• follicular dendritic cell (FDC) networks are reduced to 15% to 20% of the number found in wild-type mice
• following exposure to sheep red blood cells (SRBC) mice fail to develop normal specific IgG responses
• memory IgG responses are reduced compared to wild-type but not as much as in Ltb null mice
• affinity maturation is only slightly reduced
• however, unlike Ltb null mice IgM levels are normal

hematopoietic system
• following immunization, fewer peanut agglutinin positive (PNA+) clusters are present and very few IgD- areas typical of germinal centers are identified
• B cell follicle disruption is not as severe as in Ltb null mice
• however, some follicular dendritic cells are present and immune complex binding is observed
• follicular dendritic cell (FDC) networks are reduced to 15% to 20% of the number found in wild-type mice




Genotype
MGI:3768341
cn2
Allelic
Composition
Cd19tm1(cre)Cgn/Cd19+
Ltbtm1Avt/Ltbtm1Avt
Tg(Lck-cre)1Jtak/?
Genetic
Background
involves: 129P2/OlaHsd * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cd19tm1(cre)Cgn mutation (11 available); any Cd19 mutation (60 available)
Ltbtm1Avt mutation (0 available); any Ltb mutation (19 available)
Tg(Lck-cre)1Jtak mutation (3 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• mice lack follicular dendritic cells and no immune complex binding is observed





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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
10/29/2024
MGI 6.24
The Jackson Laboratory