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Phenotypes Associated with This Genotype
Genotype
MGI:6272304
Allelic
Composition
Myd88tm1.1Defr/Myd88tm1.1Defr
Genetic
Background
B6.129P2(SJL)-Myd88tm1.1Defr
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Myd88tm1.1Defr mutation (1 available); any Myd88 mutation (42 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• infiltrating CD45hi leukocytes are reduced by about 50% in JHMV-infected mice at 3 and 5 dpi, with differences less prominent after 7 dpi
• infiltrating neutrophils (CD45hi Ly6G+) are reduced more than 60% in JHMV-infected mice at 3 and 5 dpi
• CD4 T cell recruitment in the CNS is impaired in JHMV-infected mice, reaching only 50% or less of wild-type levels
• however, overall numbers of CD8 T cells in the CNS is not altered
• infiltrating monocytes/macrophages (CD45hi F480+) are reduced by more than 70% in JHMV-infected mice at 3 and 5 dpi but increase subsequently
• infiltrating monocytes/macrophages (CD45hi F480+) are reduced by more than 70% in JHMV-infected mice at 3 and 5 dpi but increase subsequently
• only about 7% of CNS-derived CD4 T cell population produces IFN-gamma compared to about 25% of wild-type CD4 T cells in JHMV-infected mice
• the percentage of IFN-gamma-producing CD4 T cells are reduced by about 50% in cervical lymph nodes of JHMV-infected mice
• infiltrating macrophages exhibit impaired and delayed MHC class II expression in JHMV-infected mice
• microglia exhibit reduced MHC class II expression in JHMV-infected mice
• JHMV-infected mice show reduced IFN-gamma levels and activity in the CNS throughout infection
• only about 7% of CNS-derived CD4 T cell population produces IFN-gamma compared to about 25% of wild-type CD4 T cells in JHMV-infected mice
• the percentage of IFN-gamma-producing CD4 T cells are reduced by about 50% in cervical lymph nodes of JHMV-infected mice
• mice infected intracranially with a sublethal, gliatrophic, monoclonal antibody-derived variant of mouse hepatitis virus strain JHM (JHMV) 2.2v-1 develop more severe paralytic disease than wild-type mice and do not show signs of recovery by 14 days post infection (dpi)
• JHMV-infected mice show higher viral loads within the central nervous system at 5 dpi and show no viral control until 10 dpi, showing a modest reduction at 14 dpi
• the numbers of viral antigen+ cells in JHMV-infected mice are increased and foci are more widely distributed throughout the brain, the numbers of infected cells in white matter are increased, and viral dissemination to gray matter is seen
• however, JHMV-infected mice do not exhibit hepatitis
• JHMV-infected mice show diminished recruitment of inflammatory cells during early infection, showing less pronounced perivascular inflammation in the CNS, allowing for viral dissemination
• mice infected with JHMV gradually succumb to infection with a survival rate of only about 10% by 21 dpi compared to 90% survival in wild-type mice

mortality/aging
• mice infected with JHMV gradually succumb to infection with a survival rate of only about 10% by 21 dpi compared to 90% survival in wild-type mice

nervous system
• microglia exhibit reduced MHC class II expression in JHMV-infected mice
• JHMV-infected mice exhibit increased demyelination in the brain stem and spinal cord

behavior/neurological
• JHMV-infected mice exhibit more severe paralysis than wild-type mice

hematopoietic system
• infiltrating CD45hi leukocytes are reduced by about 50% in JHMV-infected mice at 3 and 5 dpi, with differences less prominent after 7 dpi
• infiltrating neutrophils (CD45hi Ly6G+) are reduced more than 60% in JHMV-infected mice at 3 and 5 dpi
• CD4 T cell recruitment in the CNS is impaired in JHMV-infected mice, reaching only 50% or less of wild-type levels
• however, overall numbers of CD8 T cells in the CNS is not altered
• infiltrating monocytes/macrophages (CD45hi F480+) are reduced by more than 70% in JHMV-infected mice at 3 and 5 dpi but increase subsequently
• infiltrating monocytes/macrophages (CD45hi F480+) are reduced by more than 70% in JHMV-infected mice at 3 and 5 dpi but increase subsequently
• only about 7% of CNS-derived CD4 T cell population produces IFN-gamma compared to about 25% of wild-type CD4 T cells in JHMV-infected mice
• the percentage of IFN-gamma-producing CD4 T cells are reduced by about 50% in cervical lymph nodes of JHMV-infected mice
• infiltrating macrophages exhibit impaired and delayed MHC class II expression in JHMV-infected mice
• microglia exhibit reduced MHC class II expression in JHMV-infected mice


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
09/07/2021
MGI 6.17
The Jackson Laboratory