Deletions of the RUNX2 Gene are present in about 10% of Individuals with Cleidocranial Dysplasia

Claus Eric Ott (1) , Gundula Leschik (2) , Fabienne Trotier (2) , Louise Brueton (3) , Han G. Brunner (4) , Wim Brussel (5) , Encarna Guillen-Navarro (6) , Claudia Haase (7) , Juergen Kohlhase (8) , Dieter Kotzot (9) , Andrew Lane (10) , Min Ae Lee-Kirsch (11) , Susanne Morlot (12) , Marleen Eh Simon (13) , Elisabeth Steichen-Gersdorf (14) , David H Tegay (15) , Hartmut Peters (2) , Stefan Mundlos (2, 16) , Eva Klopocki (2)

1 Institut für Medizinische Genetik
2 Institut für Medizinische Genetik
3 Clinical Genetics Unit
4 Dept. of Human Genetics
5 Department of Pediatrics
6 Pediatrics
7 Department of Pediatrics
8 Praxis für Humangenetik
9 Division of Clinical Genetics
10 Department of Pediatrics
11 Klinik für Kinder- und Jugendmedizin
12 Praxis für Humangenetik
13 Department of Clinical Genetics
14 Department of Pediatrics
15 Department of Medicine
16 MPIMG - Max-Planck-Institut für Molekulare Genetik

Cleidocranial Dysplasia (CCD) is an autosomal dominant skeletal disorder characterized by hypoplastic or absent clavicles, increased head circumference, large fontanels, dental anomalies, and short stature. Hand malformations are also common. Mutations in RUNX2 cause CCD, but are not identified in all CCD patients. In this study we screened 135 unrelated patients with the clinical diagnosis of CCD for RUNX2 mutations by sequencing analysis and demonstrated 82 mutations 48 of which were novel. By quantitative PCR we screened the remaining 53 unrelated patients for copy number variations in the RUNX2 gene. Heterozygous deletions of different size were identified in 13 patients, and a duplication of the exons 1 to 4 of the RUNX2 gene in one patient. Thus, heterozygous deletions or duplications affecting the RUNX2 gene may be present in about 10% of all patients with a clinical diagnosis of CCD which corresponds to 26% of individuals with normal results on sequencing analysis. We therefore suggest that screening for intragenic deletions and duplications by qPCR or MLPA should be considered for patients with CCD phenotype in whom DNA sequencing does not reveal a causative RUNX2 mutation.

Mots clés: Life Sciences

Claus Eric Ott, Gundula Leschik, Fabienne Trotier, Louise Brueton, Han G. Brunner, et al.. Deletions of the RUNX2 Gene are present in about 10% of Individuals with Cleidocranial Dysplasia. Human Mutation, 2010, 31 (8), ⟨10.1002/humu.21298⟩. ⟨hal-00552401⟩