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      A rare case of cleidocranial dysplasia presenting with failure to thrive

      case-report

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          Abstract

          Cleidocranial dysplasia (CCD) is a rare (1:1,000,000) congenital condition secondary to spontaneous mutation (40%) or autosomal dominant inheritance (60%) affecting skeletal and dental systems. Hypomineralization of the hypoplastic clavicles and/or cranium is the major feature observed by prenatal ultrasound. Radiologically clavicles are hypoplastic or absent in chest X-ray. Delayed closure of the fontanelle and the skull sutures in pediatric and adolescent population and increased mobility of shoulders in all age groups (exhibited by the ability to bring shoulders close to each other) are prominent clinical diagnostic features of CCD. The diagnosis of CCD is often missed or significantly delayed. The management of CCD involves a multidisciplinary approach and its early diagnosis is essential to select an optimum plan and therapeutic benefit. We present here a case of CCD in a 17-month-old girl referred to us for investigation of below average weight and height gain; we stress on the usefulness of early diagnosis in the management of CCD and discuss current management concepts.

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          Missense mutations abolishing DNA binding of the osteoblast-specific transcription factor OSF2/CBFA1 in cleidocranial dysplasia.

          Cleidocranial dysplasia (CCD) is an autosomal dominant disorder characterized by hypoplastic or absent clavicles, large fontanelles, dental anomalies and delayed skeletal development. The phenotype is suggestive of a generalized defect in ossification and is one of the most common skeletal dysplasias not associated with disproportionate stature. To date, no genetic determinants of ossification have been identified. CCD has been mapped to chromosome 6p21, where CBFA1, a gene encoding OSF2/CBFA1, a transcriptional activator of osteoblast differentiation, has been localized. Here, we describe two de novo missense mutations, Met175Arg and Ser191Asn, in the OSF2/CBFA1 gene in two patients with CCD. These two mutations result in substitution of highly conserved amino acids in the DNA-binding domain. DNA-binding studies with the mutant polypeptides show that these amino acid substitutions abolish the DNA-binding ability of OSF2/CBFA1 to its known target sequence. Concurrent studies show that heterozygous nonsense mutations in OSF2/CBFA1 also result in CCD, while mice homozygous for the osf2/cbfa1 mull allele exhibit a more severe lethal phenotype. Thus, these results together suggest that CCD is produced by haploinsufficiency of OSF2/CBFA1 and provide direct genetic evidence that the phenotype is secondary to an alteration of osteoblast differentiation.
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            Cleidocranial dysplasia: a review of the dental, historical, and practical implications with an overview of the South African experience.

            Cleidocranial dysplasia (CCD) is an uncommon but well-known genetic skeletal condition. Several hundred affected persons are members of a large extended family in the Cape Town Mixed Ancestry community of South Africa. The clinical manifestations are often innocuous, but hyperdontia and other developmental abnormalities of the teeth are a major feature and may require special dental management. Over the past 40 years, the authors have encountered more than 100 affected persons in Cape Town. Emphasis has been on dental management, but medical, genetic, and social problems have also been addressed. In this article, we have reviewed the manifestations of the disorder in the light of our own experience, and performed a literature search with emphasis on the various approaches to dental management and treatment options in CCD. Advances in the understanding of the biomolecular pathogenesis of CCD are outlined and the international and local history of the disorder is documented. Copyright © 2013 Elsevier Inc. All rights reserved.
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              Cleidocranial Dysplasia: A Case Report

              Cleidocranial dysplasia (CCD) is a rare autosomal dominant skeletal disease. CCD is caused by mutation in the gene on 6p21 encoding transcription factor CBFA1, i.e. runt−related transcription factor 2(RUNX2). The disease is characterized by a persistently open anterior fontanelle and skull sutures, hypoplastic or aplastic clavicles, dental abnormalities, short stature, a wide pubic symphysis, and a variety of other skeletal changes. A major finding of CCD is hypoplasia or aplasia of clavicular bones resulting in the ability of the patient to approximate the shoulders. Delayed closure of the anterior fontanelle and of metopic sutures causes frontal bossing. We report a case of CCD in a 3.5−yearold boy who referred to our clinic because of an unclosed anterior fontanelle and emphasize the importance of clinical findings in CCD. Conflict of interest:None declared.
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                Author and article information

                Journal
                J Nat Sci Biol Med
                J Nat Sci Biol Med
                JNSBM
                Journal of Natural Science, Biology, and Medicine
                Medknow Publications & Media Pvt Ltd (India )
                0976-9668
                2229-7707
                Jan-Jun 2015
                : 6
                : 1
                : 232-235
                Affiliations
                [1] Radiology Department, Hamad Medical Corporation, Doha, Qatar
                [1 ] Mahajan Clinic, Kandivali (West), Mumbai, Maharashtra, India
                Author notes
                Address for correspondence: Dr. Parag Suresh Mahajan, Radiology Department, Hamad Medical Corporation, P. O. Box 3050, Doha, Qatar. E-mail: mdfrcr@ 123456gmail.com
                Article
                JNSBM-6-232
                10.4103/0976-9668.149198
                4367046
                4bd1c939-c56d-43fc-b235-4858fa8631ce
                Copyright: © Journal of Natural Science, Biology and Medicine

                This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Categories
                Case Report

                Life sciences
                absent or hypoplastic clavicles,cleidocranial dysplasia,short stature,supernumerary teeth,wide fontanelle

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