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Phenotypes Associated with This Genotype
Genotype
MGI:3624516
Allelic
Composition
In(4)56Rk/+
Genetic
Background
involves: C57BL/6J * DBA/2J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
In(4)56Rk mutation (1 available); any In(4)56Rk mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
vision/eye
• optic atrophy appears in the fundus by 4 weeks of age
• retinal vessel attenuation appears in the fundus by 4 weeks of age
• pigment spots appear in the fundus by 4 weeks of age
• the outer nuclear layer begins to reduce at 10 days and is lost by 6 weeks of age
• layer begins to reduce at 10 days of age in mutants and is totally lost at 6 weeks
• by 2 weeks of age, the photoreceptor layer
• by 3 weeks of age, only cones are detected in mutants; by 6 weeks, there are no photoreceptors
• in mutants, the electroretinogram is never normal

nervous system
• by 3 weeks of age, only cones are detected in mutants; by 6 weeks, there are no photoreceptors

pigmentation
• pigment spots appear in the fundus by 4 weeks of age

cardiovascular system
• retinal vessel attenuation appears in the fundus by 4 weeks of age


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
03/31/2026
MGI 6.24
The Jackson Laboratory