About   Help   FAQ
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





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)
Citing These Resources
Funding Information
Warranty Disclaimer, Privacy Notice, Licensing, & Copyright
Send questions and comments to User Support.
last database update
11/12/2024
MGI 6.24
The Jackson Laboratory