Conflict of interest: none.
MMP13 mutations are the cause of recessive metaphyseal dysplasia, Spahr type
Version of Record online: 19 MAR 2014
© 2014 Wiley Periodicals, Inc.
American Journal of Medical Genetics Part A
Volume 164, Issue 5, pages 1175–1179, May 2014
How to Cite
2014. MMP13 mutations are the cause of recessive metaphyseal dysplasia, spahr type. Am J Med Genet Part A 321A:1175–1179., , , , , , , , , , , , , , , .
Luisa Bonafé, Jinlong Liang, and Maria Gorna contributed equally to this work.
Wei Wang, André Spahr, and Andrea Superti-Furga are the joint senior authors.
- Issue online: 14 APR 2014
- Version of Record online: 19 MAR 2014
- Manuscript Accepted: 19 DEC 2013
- Manuscript Received: 2 NOV 2013
- Swiss National Foundation. Grant Number: 310030_132940
- Leenaards Foundation (Lausanne)
- Faculty of Biology and Medicine of the Lausanne University (Fonds de Recherche en Pédiatrie)
- metaphyseal dysplasia;
- Spahr dysplasia;
- exome sequencing
Metaphyseal dysplasia, Spahr type (MDST; OMIM 250400) was described in 1961 based on the observation of four children in one family who had rickets-like metaphyseal changes but normal blood chemistry and moderate short stature. Its molecular basis and nosologic status remained unknown. We followed up on those individuals and diagnosed the disorder in an additional member of the family. We used exome sequencing to ascertain the underlying mutation and explored its consequences on three-dimensional models of the affected protein. The MDST phenotype is associated with moderate short stature and knee pain in adults, while extra-skeletal complications are not observed. The sequencing showed that MDST segregated with a c.619T>G single nucleotide transversion in MMP13. The predicted non-conservative amino acid substitution, p.Trp207Gly, disrupts a crucial hydrogen bond in the calcium-binding region of the catalytic domain of the matrix metalloproteinase, MMP13. The MDST phenotype is associated with recessive MMP13 mutations, confirming the importance of this metalloproteinase in the metaphyseal growth plate. Dominant MMP13 mutations have been associated with metaphyseal anadysplasia (OMIM 602111), while a single child homozygous for a MMP13 mutation had been previously diagnosed as “recessive metaphyseal anadysplasia,” that we conclude is the same nosologic entity as MDST. Molecular confirmation of MDST allows distinction of it from dominant conditions (e.g., metaphyseal dysplasia, Schmid type; OMIM # 156500) and from more severe multi-system conditions (such as cartilage-hair hypoplasia; OMIM # 250250) and to give precise recurrence risks and prognosis. © 2014 Wiley Periodicals, Inc.