About   Help   FAQ
Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Cd8b1+
wild type
MGI:2430275
Summary 3 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
ht1
Cd8b1M1Btlr/Cd8b1+ C57BL/6J-Cd8b1M1Btlr MGI:6113880
cx2
Cd8b1tm1Litt/Cd8b1+
Tg(Cd8b1)46Erob/0
involves: 129S4/SvJae * C57BL/6 * CBA MGI:3665228
cx3
Cd8b1tm1Litt/Cd8b1+
Tg(TcraH-Y,TcrbH-Y)71Vbo/0
involves: 129S4/SvJae * C57BL/6J * DBA/2 MGI:3665230


Genotype
MGI:6113880
ht1
Allelic
Composition
Cd8b1M1Btlr/Cd8b1+
Genetic
Background
C57BL/6J-Cd8b1M1Btlr
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cd8b1M1Btlr mutation (0 available); any Cd8b1 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system

hematopoietic system




Genotype
MGI:3665228
cx2
Allelic
Composition
Cd8b1tm1Litt/Cd8b1+
Tg(Cd8b1)46Erob/0
Genetic
Background
involves: 129S4/SvJae * C57BL/6 * CBA
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cd8b1tm1Litt mutation (1 available); any Cd8b1 mutation (21 available)
Tg(Cd8b1)46Erob mutation (0 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• CD8 to CD4 ratio is 2.2-fold lower than in wild-type
• there is a lack of mature CD8-lineage T cells
• mice have 3-fold fewer CD8-lineage thymocytes compared to wild-type

homeostasis/metabolism
• thymocytes display 4-fold less CD8-associated Lck activity vs wild-type
• activity of Lck is reduced but significant levels are detected in mutants; there is a slight reduction in CD8a-associated activity compared to wild-type

hematopoietic system
• CD8 to CD4 ratio is 2.2-fold lower than in wild-type
• there is a lack of mature CD8-lineage T cells
• mice have 3-fold fewer CD8-lineage thymocytes compared to wild-type

endocrine/exocrine glands
• mice have 3-fold fewer CD8-lineage thymocytes compared to wild-type




Genotype
MGI:3665230
cx3
Allelic
Composition
Cd8b1tm1Litt/Cd8b1+
Tg(TcraH-Y,TcrbH-Y)71Vbo/0
Genetic
Background
involves: 129S4/SvJae * C57BL/6J * DBA/2
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cd8b1tm1Litt mutation (1 available); any Cd8b1 mutation (21 available)
Tg(TcraH-Y,TcrbH-Y)71Vbo mutation (4 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• male transgenic mice show disruption of relative and absolute numbers of double positive T cells in the thymus

immune system
• male transgenic mice show disruption of relative and absolute numbers of double positive T cells in the thymus





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
12/30/2025
MGI 6.24
The Jackson Laboratory