About   Help   FAQ
Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
MitfMi-Or
microphthalmia Oak Ridge
MGI:1856087
Summary 3 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
MitfMi-Or/MitfMi-Or involves: 101/Rl * C3H/Rl MGI:4356528
ht2
MitfMi-Or/Mitf+ involves: 101/Rl * C3H/Rl MGI:4356529
ht3
MitfMi-b/MitfMi-Or involves: 101/Rl * C3H/Rl MGI:4410317


Genotype
MGI:4356528
hm1
Allelic
Composition
MitfMi-Or/MitfMi-Or
Genetic
Background
involves: 101/Rl * C3H/Rl
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
MitfMi-Or mutation (2 available); any Mitf mutation (72 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mice die after weaning
• however, mice fed powdered food survive

reproductive system

skeleton
• incisors are poorly formed if they erupt
• often (J:13426)
• incisors fail to erupt (J:89821)
• increased size at P1 but not at P37 and 3 to 8 months
• TRAP activity is decreased at P37 but not at 3 to 8 months
• mice exhibit a slight widening of lateral length at the metaphyses of distal femurs and proximal tibiae unlike in wild-type mice
• at 10, 18, and 37 days, mice exhibit an accumulation of unresorbed endochondral trabeculae unlike in wild-type mice
• however, no accumulation occurs at the of primary spongiosa at the mid-diaphyses
• metaphyseal borders are irregular
• mice exhibit increased density of the cancellous bone, with some cartilagenous matricies remaining inside the trabeculae at 3-4 months of age
• at 8 months, one mouse still had densely accumulated trabeculae in the caudal vertebrae
• mice exhibit osteopetrotic lesions during the first 5 weeks that improves after 3 months (J:30149)
• osteopetrosis is more severe than that seen in Mitfmi-ew homozygotes but less severe than in Mitfmi homozygotes (J:89821)
• at P37, sclerotic lesions are observed at the proximal end of the humerus and tibias unlike in wild-type mice
• mice exhibit sclerotic lesions at the costochondral junction and at the metaphysis of the vertebrae unlike in wild-type mice
• at 3 to 4 months, mice exhibit sclerotic lesions in the metaphyseal areas that are less obvious than at P37
• mice develop osteopetrotic lesions that improve with age
• mice exhibit degeneration in the growth plate
• at P37, slight lesions are found in the long bone epiphyseal plate
• mice exhibit an increase in the length of growth plate length at the costochondral junction at P1 that decreases with age

vision/eye
• in some mice (J:13426)
• in some mice

pigmentation
• fur is white (J:13426)

craniofacial
• incisors are poorly formed if they erupt
• often (J:13426)
• incisors fail to erupt (J:89821)

hematopoietic system
• increased size at P1 but not at P37 and 3 to 8 months
• TRAP activity is decreased at P37 but not at 3 to 8 months

immune system
• increased size at P1 but not at P37 and 3 to 8 months
• TRAP activity is decreased at P37 but not at 3 to 8 months

integument
• fur is white (J:13426)

growth/size/body
• incisors are poorly formed if they erupt
• often (J:13426)
• incisors fail to erupt (J:89821)

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
osteopetrosis DOID:13533 OMIM:PS259700
OMIM:PS607634
J:30149




Genotype
MGI:4356529
ht2
Allelic
Composition
MitfMi-Or/Mitf+
Genetic
Background
involves: 101/Rl * C3H/Rl
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
MitfMi-Or mutation (2 available); any Mitf mutation (72 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
pigmentation
• pale and pinkish
• slightly (J:13426)
• slightly (J:30149)
• often (J:13426)
• often
• pale and pinkish
• at birth, eye pigment is reduced
• however, adult mice exhibit full-color eye pigmentation

vision/eye
• at birth, eye pigment is reduced
• however, adult mice exhibit full-color eye pigmentation

craniofacial
• pale and pinkish

hearing/vestibular/ear
• pale and pinkish

limbs/digits/tail
• pale and pinkish

integument
• pale and pinkish
• slightly (J:13426)
• slightly (J:30149)
• often (J:13426)
• often
• pale and pinkish

growth/size/body
• pale and pinkish




Genotype
MGI:4410317
ht3
Allelic
Composition
MitfMi-b/MitfMi-Or
Genetic
Background
involves: 101/Rl * C3H/Rl
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
MitfMi-b mutation (2 available); any Mitf mutation (72 available)
MitfMi-Or mutation (2 available); any Mitf mutation (72 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
pigmentation
• mice are white, indistinguishable from mice homozygous for Mitf

vision/eye

integument
• mice are white, indistinguishable from mice homozygous for Mitf





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
04/23/2024
MGI 6.23
The Jackson Laboratory