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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Sbf1em1Frobi
endonuclease-mediated mutation 1, Fred Robinson
MGI:6860354
Summary 2 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Sbf1em1Frobi/Sbf1em1Frobi C57BL/6N-Sbf1em1Frobi MGI:7316771
cx2
Sbf1em1Frobi/Sbf1em1Frobi
Sbf2Gt(RRF511)Byg/Sbf2Gt(RRF511)Byg
involves: 129P2/OlaHsd * C57BL/6N MGI:7316772


Genotype
MGI:7316771
hm1
Allelic
Composition
Sbf1em1Frobi/Sbf1em1Frobi
Genetic
Background
C57BL/6N-Sbf1em1Frobi
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sbf1em1Frobi mutation (1 available); any Sbf1 mutation (43 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
growth/size/body
• mice are approximately 30% smaller than wild-type mice
• reduced weight is seen at weaning and continues throughout life

nervous system
• sciatic nerves at 3 months show an increase in the proportion of bundled axons that have a diameter of more than 1 um, indicating delayed or arrested sorting of some large axons from bundles
• mice exhibit fewer total myelinated axons in sciatic nerves
• sciatic nerves at 3 months show an increase in unmyelinated axons that are in 1:1 relationships with Schwann cells, although most axons are smaller than 1 um in diameter
• however, the number of axons per bundle does not differ
• a decrease in the percentage of bundles containing between 11 and 20 axons is seen in sciatic nerves
• bundled axons of sciatic nerves are more likely to be incompletely enwrapped by Schwann cell processes, as evidenced by direct contact of axons with basal laminae
• however, mice do not show loss of myelin outfoldings and show normal myelination, with no alterations in myelin thickness or diameter of myelinated axons

reproductive system

behavior/neurological
N
• overt motor or gait deficiencies are not seen at P38 or 17 months of age

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
Charcot-Marie-Tooth disease type 4B3 DOID:0110194 OMIM:615284
J:326685




Genotype
MGI:7316772
cx2
Allelic
Composition
Sbf1em1Frobi/Sbf1em1Frobi
Sbf2Gt(RRF511)Byg/Sbf2Gt(RRF511)Byg
Genetic
Background
involves: 129P2/OlaHsd * C57BL/6N
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sbf1em1Frobi mutation (1 available); any Sbf1 mutation (43 available)
Sbf2Gt(RRF511)Byg mutation (1 available); any Sbf2 mutation (105 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mice die during late gestation or within a few hours of birth
• however, overt morphological defects are not apparent

growth/size/body
• E13-15 mutants are smaller

nervous system
N
• nerve bundles in pinna appear morphologically normal





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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
09/17/2024
MGI 6.24
The Jackson Laboratory