Severe cleidocranial dysplasia and hypophosphatasia in a child with microdeletion of the C-terminal region of RUNX2.

Journal Article (Journal Article)

Cleidocranial dysplasia (CCD) is a rare autosomal dominant skeletal dysplasia due to mutations causing haploinsufficiency of RUNX2, an osteoblast transcription factor specific for bone and cartilage. The classic form of CCD is characterized by delayed closure of the fontanels, hypoplastic or aplastic clavicles and dental anomalies. Clinical reports suggest that a subset of patients with CCD have skeletal changes which mimic hypophosphatasia (HPP). Mutations in RUNX2 are detected in approximately 65% of cases of CCD, and microdeletions occur in 13%. We present clinical and radiological features in a 6-year-old child with severe CCD manifested by absence of the clavicles marked calvarial hypomineralization, osteoporosis and progressive kyphoscoliosis. HPP features included Bowdler spurs, severe osteopenia, and low alkaline phosphatase. Following negative mutation analysis of RUNX2, comparative genomic hybridization (CGH) microarray was performed. The result revealed a microdeletion in RUNX2, disrupting the C-terminal part of the gene.

Full Text

Duke Authors

Cited Authors

  • El-Gharbawy, AH; Peeden, JN; Lachman, RS; Graham, JM; Moore, SR; Rimoin, DL

Published Date

  • January 2010

Published In

Volume / Issue

  • 152A / 1

Start / End Page

  • 169 - 174

PubMed ID

  • 20014132

Pubmed Central ID

  • PMC2799546

Electronic International Standard Serial Number (EISSN)

  • 1552-4833

Digital Object Identifier (DOI)

  • 10.1002/ajmg.a.33146

Language

  • eng

Conference Location

  • United States