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A Missense Mutation in the Mouse Col2a1 Gene Causes Spondyloepiphyseal Dysplasia Congenita, Hearing Loss, and Retinoschisis
Author(s) -
Donahue Leah Rae,
Chang BO,
Mohan Subburaman,
Miyakoshi Nao,
Wergedal Jon E,
Baylink David J,
Hawes Norman L,
Rosen Clifford J,
WardBailey Patricia,
Zheng Qing Y,
Bronson Roderick T,
Johnson Kenneth R,
Davisson Muriel T
Publication year - 2003
Publication title -
journal of bone and mineral research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.882
H-Index - 241
eISSN - 1523-4681
pISSN - 0884-0431
DOI - 10.1359/jbmr.2003.18.9.1612
Subject(s) - missense mutation , retinoschisis , genetics , mutation , biology , phenotype , osteochondrodysplasia , exon , point mutation , gene mutation , gene , anatomy , biochemistry , retinal detachment , retinal
A missense mutation in the mouse Col2a1 gene has been discovered, resulting in a mouse phenotype with similarities to human spondyloepiphyseal dysplasia (SED) congenita. In addition, SED patients have been identified with a similar molecular mutation in human COL2A1 . This mouse model offers a useful tool for molecular and biological studies of bone development and pathology. Introduction: A new mouse autosomal recessive mutation has been discovered and named spondyloepiphyseal dysplasia congenita (gene symbol sedc ). Materials and Methods: Homozygous sedc mice can be identified at birth by their small size and shortened trunk. Adults have shortened noses, dysplastic vertebrae, femora, and tibias, plus retinoschisis and hearing loss. The mutation was mapped to Chr15, and Col2a1 was identified as a candidate gene. Results: Sequence analyses revealed that the affected gene is Col2a1 , which has a missense mutation at exon 48 causing an amino acid change of arginine to cysteine at position 1417. Two human patients with spondyloepiphyseal dysplasia (SED) congenita have been reported with the same amino acid substitution at position 789 in the human COL2A1 gene. Conclusions: Thus, sedc/sedc mice provide a valuable model of human SED congenita with molecular and phenotypic homology. Further biochemical analyses, molecular modeling, and cell culture studies using sedc/sedc mice could provide insight into mechanisms of skeletal development dependent on Col2a1 and its role in fibril formation and cartilage template organization.