Prospective signs of cleidocranial dysplasia in Cebpb deficiency

Huang, Boyen, Takahashi, Katsu, Jennings, Ernest, Pumtang-on, Pongthorn, Kiso, Honoka, Togo, Yumiko, Saito, Kazuyuki, Sugai, Manabu, Akira, Shizuo, Shimizu, Akira, and Bessho, Kazuhisa (2014) Prospective signs of cleidocranial dysplasia in Cebpb deficiency. Journal of Biomedical Science, 21. 44. pp. 1-8.

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Background: Although runt-related transcription factor 2 (RUNX2) has been considered a determinant of cleidocranial dysplasia (CCD), some CCD patients were free of RUNX2 mutations. CCAAT/enhancer-binding protein beta (Cebpb) is a key factor of Runx2 expression and our previous study has reported two CCD signs including hyperdontia and elongated coronoid process of the mandible in Cebpb deficient mice. Following that, this work aimed to conduct a case-control study of thoracic, zygomatic and masticatory muscular morphology to propose an association between musculoskeletal phenotypes and deficiency of Cebpb, using a sample of Cebpb-/-, Cebpb+/- and Cebpb+/+ adult mice. Somatic skeletons and skulls of mice were inspected with soft x-rays and micro-computed tomography (μCT), respectively. Zygomatic inclination was assessed using methods of coordinate geometry and trigonometric function on anatomic landmarks identified with μCT. Masseter and temporal muscles were collected and weighed. Expression of Cebpb was examined with a reverse transcriptase polymerase chain reaction (RT-PCR) technique.

Results: Cebpb-/- mice displayed hypoplastic clavicles, a narrow thoracic cage, and a downward tilted zygomatic arch (p < 0.001). Although Cebpb+/- mice did not show the phenotypes above (p = 0.357), a larger mass percentage of temporal muscles over masseter muscles was seen in Cebpb+/- littermates (p = 0.012). The mRNA expression of Cebpb was detected in the clavicle, the zygoma, the temporal muscle and the masseter muscle, respectively.

Conclusions: Prospective signs of CCD were identified in mice with Cebpb deficiency. These could provide an additional aetiological factor of CCD. Succeeding investigation into interactions among Cebpb, Runx2 and musculoskeletal development is indicated.

Item ID: 33507
Item Type: Article (Research - C1)
ISSN: 1423-0127
Keywords: Cebpb; cleidocranial dysplasia; clavicle; thoracic cage; zygomatic arch; masseter; temporal muscle
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This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.

Funders: Japanese Society for the Promotion of Science (JSPS), Australian Academy of Science
Projects and Grants: JSPS Postdoctoral Fellowship P09741
Date Deposited: 02 Jun 2014 23:52
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1105 Dentistry > 110507 Paedodontics @ 50%
11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110311 Medical Genetics (excl Cancer Genetics) @ 50%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920110 Inherited Diseases (incl. Gene Therapy) @ 30%
92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920113 Oro-Dental Disorders @ 50%
92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920116 Skeletal System and Disorders (incl. Arthritis) @ 20%
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