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Phenotypes Associated with This Genotype
Genotype
MGI:5320482
cn3
Allelic
Composition
Isl1tm2Sev/Isl1tm2.1Sev
Tg(Hoxb6-cre)#Mku/0
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * FVB/N
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Isl1tm2.1Sev mutation (0 available); any Isl1 mutation (38 available)
Isl1tm2Sev mutation (1 available); any Isl1 mutation (38 available)
Tg(Hoxb6-cre)#Mku mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• expression analysis indicates proximal patterning defects in the hindlimb buds
• variable severity of hindlimb digit loss
• almost half of mice display hindlimbs with only 3 digits
• less severely affected mice develop 4 hindlimb digits, lacking the posterior digit 5
• only a single zeugopodal element, likely corresponding to the tibia, is present in most mice with 1 - 3 digits on the hindlimb
• mice with 4 digits on the hindlimb show more variability in zeugopodal defects
• in severely affected mice

embryo
• expression analysis indicates proximal patterning defects in the hindlimb buds

skeleton
• patterning failure
• patterning failure


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
03/24/2026
MGI 6.24
The Jackson Laboratory