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Phenotypes Associated with This Genotype
Genotype
MGI:8349864
Allelic
Composition
Gja1em1Ipche/Gja1em1Ipche
Genetic
Background
C57BL/6J-Gja1em1Ipche
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Gja1em1Ipche mutation (0 available); any Gja1 mutation (62 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• mice at 3 months of age exhibit increased radiopacity of craniofacial bones
• mice exhibit thickening of skull bones
• mice exhibit narrowed neural foramina at the cranial base
• thickened calvariae
• mice show jawbone thickening, with increased bone volume, total volume, and bone volume/total volume ratio
• mice at 3 months of age exhibit increased alveolar bone mass and thickened mandibular alveolar bone
• however, mice have normal tooth eruption and positioning of cervical loops
• mice at 3 months of age exhibit club-shaped femurs with thickened diaphyseal cortical bone
• males exhibit increased femur length
• hypersclerotic diaphyseal cortical bone in femurs
• mice exhibit widened, flared femur metaphysis
• however, no differences in metaphyseal measurements of the femur are seen, such as trabecular bone mass, trabecular number, trabecular spacing, or trabecular thickness
• mice have increased sub-periosteal and sub-endosteal area
• cortical bones of the mid-diaphyseal region of femurs exhibit increased TRAP+ cells on the endosteal surface and very little on periosteum indicating an opposite location pattern of bone forming cells and TRAP+ cells in mutants compared to wild-type mice
• mandibles and femurs exhibit increased bone volume, total volume, and bone mineral density in mandibles and femurs
• increase in cortical diaphyseal porosity
• cortical bone thickening in the diaphysis
• increase in cortical thickness
• the lacunar area of osteocytes is increased due to increased perilacunar space but the cell body area is normal
• dendrites of osteocytes in diaphyseal cortical bone are reduced in number and length
• mice show increased bone mass in craniofacial bones and diaphyseal cortical bones but no changes in vertebrae nor metaphyseal trabecular bones
• mice show increased bone mass in diaphyseal cortical bones
• mice progressively develop bone overgrowths in multiple sites of craniofacial and long bones, including but not limited to, femurs and mandibles
• females present with more prominent skeletal abnormalities with aging
• diaphyseal cortical bones show active bone formation on the periosteal surface unlike in wild-type mice which show it on the endosteal surface, with the mineralizing surface/bone surface (MS/BS), mineral apposition rate (MAR), and bone formation rate (BFR) increased in the periosteum but decreased in the endosteum
• females exhibit increased MAR in the periosteum in areas of bone overgrowths, suggesting that more bone deposition occurs in females
• serum levels of P1NP, a marker for bone formation, are increased at 8 months but not 3 months of age in females
• however, no differences in mineral apposition rate (MAR), bone formation rate (BFR), osteoblast surface (including bone forming and bone lining surfaces , osteoclast surface including bone resorbing surface and bone remodeling surface in femoral metaphyses are seen and serum levels of CTX, a marker for bone resorption, are normal
• the mineralizing surface/bone surface (MS/BS) and mineral apposition rate (MAR) are increased in the periosteum and are decreased in the endosteum
• females exhibit increased osteoclast surface and bone remodeling unit surface than male mice
• calvarial osteoblasts grown in osteogenic differentiation medium show increased proliferation but comparable apoptosis and mineral nodule formation to wild-type cells
• bone marrow-derived macrophages plated on bone chips show a reduction of the resorptive activity of active osteoclasts in the bone resorption pit assay
• reduction in numbers of active osteoclasts form on bone chips from bone marrow-derived macrophages

craniofacial
• mice at 3 months of age exhibit increased radiopacity of craniofacial bones
• mice exhibit thickening of skull bones
• mice exhibit narrowed neural foramina at the cranial base
• thickened calvariae
• mice show jawbone thickening, with increased bone volume, total volume, and bone volume/total volume ratio
• mice at 3 months of age exhibit increased alveolar bone mass and thickened mandibular alveolar bone
• however, mice have normal tooth eruption and positioning of cervical loops

growth/size/body
• mice show jawbone thickening, with increased bone volume, total volume, and bone volume/total volume ratio
• mice at 3 months of age exhibit increased alveolar bone mass and thickened mandibular alveolar bone
• however, mice have normal tooth eruption and positioning of cervical loops

hematopoietic system
• bone marrow-derived macrophages plated on bone chips show a reduction of the resorptive activity of active osteoclasts in the bone resorption pit assay
• reduction in numbers of active osteoclasts form on bone chips from bone marrow-derived macrophages

immune system
• bone marrow-derived macrophages plated on bone chips show a reduction of the resorptive activity of active osteoclasts in the bone resorption pit assay
• reduction in numbers of active osteoclasts form on bone chips from bone marrow-derived macrophages

limbs/digits/tail
• increase in cortical thickness
• mice at 3 months of age exhibit club-shaped femurs with thickened diaphyseal cortical bone
• males exhibit increased femur length

cellular
• calvarial osteoblasts grown in osteogenic differentiation medium show increased proliferation but comparable apoptosis and mineral nodule formation to wild-type cells

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
autosomal recessive craniometaphyseal dysplasia DOID:0080802 OMIM:218400
J:386099


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
06/09/2026
MGI 6.24
The Jackson Laboratory