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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 (74 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 (74 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 (74 available)
MitfMi-Or mutation (2 available); any Mitf mutation (74 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





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last database update
11/05/2024
MGI 6.24
The Jackson Laboratory