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Phenotypes Associated with This Genotype
Genotype
MGI:3840080
Allelic
Composition
Fgfr3tm1Llm/Fgfr3+
Genetic
Background
involves: 129S2/SvPas * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgfr3tm1Llm mutation (0 available); any Fgfr3 mutation (54 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mice die 6 to 8 weeks after birth

skeleton
• at P0, mice exhibit skeletal dysplasia that worsens with age unlike wild-type mice
• mice exhibit anterior displacement of the foramen magnum
• the skull base is shortened compared to in wild-type mice
• with a slight increase in left-right and dorsal-ventral axes
• mice exhibit an abnormal temporal bone orientation
• the region of the temporal bone corresponding to the human mastoid is poorly developed with low pneumatization compared to in wild-type mice
• prognathic mandible
• delayed ossification at P14
• delayed ossification
• at P7, the orbibular apophysis of the malleus is still cartilaginous unlike in wild-type mice
• delayed ossification
• at 3 weeks of age
• at 3 weeks of age
• at 3 weeks of age
• at 3 weeks of age
• hypertrophic chondrocytes are reduced in number and size compared to in wild-type mice
• disorganized with shortened chondrocyte columns and hypertrophic chondrocytes that are reduced in number and size

hearing/vestibular/ear
• delayed ossification at P14
• delayed ossification
• at P7, the orbibular apophysis of the malleus is still cartilaginous unlike in wild-type mice
• delayed ossification
• at P0, ossification in the cochlea is severely delayed compared to in wild-type mice
• the tunnel of the Corti presents a smaller opening than in wild-type mice
• the space in between the outer hair cells is broader than in wild-type mice
• the two first rows of outer hair cells are not supported at their basal poles by Dieter's cell but are replaced by a pillar-like structure called modified Dieter's cells
• mice exhibit two ectopic pillars (modified Deiter's cells) close to the first two outer hair cells in addition to the two normal pillar cells and instead of normally placed Dieter cells
• mice display a significantly higher ABR threshold for frequencies between 3 to 50 kHz, with a maximum of 50 dB for the medium range frequencies, and around 30 dB for lower and higher frequencies indicating a mild hearing loss

craniofacial
• mice exhibit anterior displacement of the foramen magnum
• the skull base is shortened compared to in wild-type mice
• with a slight increase in left-right and dorsal-ventral axes
• mice exhibit an abnormal temporal bone orientation
• the region of the temporal bone corresponding to the human mastoid is poorly developed with low pneumatization compared to in wild-type mice
• prognathic mandible
• delayed ossification at P14
• delayed ossification
• at P7, the orbibular apophysis of the malleus is still cartilaginous unlike in wild-type mice
• delayed ossification
• the midface is hypoplastic compared to in wild-type mice

growth/size/body
• the midface is hypoplastic compared to in wild-type mice

nervous system
• the space in between the outer hair cells is broader than in wild-type mice
• the two first rows of outer hair cells are not supported at their basal poles by Dieter's cell but are replaced by a pillar-like structure called modified Dieter's cells

limbs/digits/tail
• at 3 weeks of age
• at 3 weeks of age
• at 3 weeks of age
• at 3 weeks of age

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
thanatophoric dysplasia DOID:13481 OMIM:187600
OMIM:187601
OMIM:273680
J:147208


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
11/12/2024
MGI 6.24
The Jackson Laboratory