A novel FAM20C mutation causing hypophosphatemic osteomalacia with osteosclerosis (mild Raine syndrome) in an elderly man with spontaneous osteonecrosis of the knee.
FAM20C mutations in humans cause Raine syndrome and our previous studies showed that global inactivation of mouse Fam20C led to bone and dental defects.
We report on a case of Raine syndrome with a mutation in FAM20C and typical phenotypic features consisting of midface hypoplasia, hypoplastic nose, choanal atresia, wide fontanelle, exophthalmos, generalized osteosclerosis and intracranial calcification.
We report on a case of Raine syndrome with a mutation in FAM20C and typical phenotypic features consisting of midface hypoplasia, hypoplastic nose, choanal atresia, wide fontanelle, exophthalmos, generalized osteosclerosis and intracranial calcification.
We report an adult case of Raine syndrome accompanying hypophosphatemic osteomalacia with a homozygous FAM20C mutation (R408W) associated with increased periosteal bone formation in the long bones and an increase in bone mineral density in the femoral neck.
Genetic studies showed that the loss-of-function mutations in FAM20C were associated with human lethal osteosclerotic bone dysplasia (Raine Syndrome), implying an inhibitory role of this molecule in bone formation.
Identification of a homozygous mutation in the FAM20C gene confirmed the Raine syndrome diagnosis, thus contributing to the expansion of the Raine syndrome phenotype.
Identification of a homozygous mutation in the FAM20C gene confirmed the Raine syndrome diagnosis, thus contributing to the expansion of the Raine syndrome phenotype.
However, the identification of mutations in these two patients confirms a broader phenotypic spectrum and that mutation of FAM20C does not always lead to the infantile lethality previously seen as a prerequisite for Raine syndrome diagnosis.
However, the identification of mutations in these two patients confirms a broader phenotypic spectrum and that mutation of FAM20C does not always lead to the infantile lethality previously seen as a prerequisite for Raine syndrome diagnosis.