Osteosclerotic bone dysplasia in siblings with a Fam20C mutation
Article first published online: 23 JUL 2010
© 2010 John Wiley & Sons A/S
Special Issue: Exome Sequencing
Volume 80, Issue 2, pages 177–183, August 2011
How to Cite
Fradin, M., Stoetzel, C., Muller, J., Koob, M., Christmann, D., Debry, C., Kohler, M., Isnard, M., Astruc, D., Desprez, P., Zorres, C., Flori, E., Dollfus, H. and Doray, B. (2011), Osteosclerotic bone dysplasia in siblings with a Fam20C mutation. Clinical Genetics, 80: 177–183. doi: 10.1111/j.1399-0004.2010.01516.x
- Issue published online: 12 JUL 2011
- Article first published online: 23 JUL 2010
- Accepted manuscript online: 23 JUL 2010 12:00AM EST
- Received 26 April 2010, revised and accepted for publication 19 July 2010
- bone dysplasia;
- Raine syndrome
Fradin M, Stoetzel C, Muller J, Koob M, Christmann D, Debry C, Kohler M, Isnard M, Astruc D, Desprez P, Zorres C, Flori E, Dollfus H, Doray B. Osteosclerotic bone dysplasia in siblings with a Fam20C mutation.
Raine syndrome is an autosomal recessive disorder caused by mutations in the FAM20C gene. FAM20C codes for the human homolog of DMP4, a dentin matrix protein highly expressed in odontoblasts and moderately in bone. DMP4 is probably playing a role in the mineralization process. Since the first case reported in 1989 by Raine et al. 21 cases have been published delineating a phenotype which associates dysmorphic features, cerebral calcifications, choanal atresia or stenosis and thoracic/pulmonary hypoplasia. Kan and Kozlowski suggested the name of Raine syndrome to describe this new lethal osteosclerotic bone dysplasia. All the cases described were lethal during the neonatal period except for the last two reported patients aged 8 and 11 years who presented severe mental retardation. Here we describe two sisters, with an attenuated phenotype of Raine syndrome, who present an unexpectedly normal psychomotor development at ages 4 and 1, respectively. Identification of a homozygous mutation in the FAM20C gene confirmed the Raine syndrome diagnosis, thus contributing to the expansion of the Raine syndrome phenotype. This case report also prompted us to revisit the FAM20 gene classification and allowed us to highlight the ancestral status of Fam20C.