Cranio-fronto-nasal dysplasia Cranio-fronto-nasal dysplasia Cranio-fronto-nasal dysplasia is a type of craniosynostosis. The name describes the parts of the skull and face affected. This page from Great Ormond Street Hospital GOSH explains the causes, symptoms and treatment of cranio-fronto-nasal dysplasia also known as cranio-fronto-nasal dysostosis. As we grow older, the sutures gradually fuse stick together, usually after all head growth has finished. When a child has craniosynostosis, the sutures fuse before birth. It can affect one suture or several.
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Presentation[ edit ] CT-scan of the skull of a patient with coronal synostosis, orbital hypertelorism, and facial asymmetry as part of craniofrontonasal dysplasia. Picture of longitudinal ridging and splitting of the toenails as part of craniofrontonasal dysplasia. Phenotypic expression varies greatly between individuals with CFND.
Males can however have some of the same symptoms as females, but this is not frequently seen. This is called a mosaic pattern. Females have two X-chromosomes and males have one X-chromosome. This is due to the large heterogeneity between patients regarding phenotypic expression.
However, it is important to distinguish this population from CFND for research purposes. On the other hand, especially in males, it is possible that someone is a carrier of the EFNB1 gene mutation yet does not present with any physical manifestations. Genetic counseling or prenatal screening may be advised if there is a reason to suspect the presence of an EFNB1 gene mutation. However, this is quite difficult as facial involvement may not be obvious at such an early age, especially in cases with mild phenotypic presentation.
This however carries a greater risk of premature termination of the pregnancy. Each patient needs to be assessed and treated based on their specific presentation in order to restore the aesthetic and functional balance. Facial bipartition is the preferable choice as there are less additional corrections needed, as well as providing a more stable long-term result after treatment. This is for good alignment of the eyes with the nose for the best aesthetic result.
As such there is little information and no consensus in the published literature regarding the epidemiological statistics. The incidence values that were reported ranged from , to , Mutations of the ephrin-B1 gene cause craniofrontonasal syndrome.
Am J Hum Genet , Mutations of ephrin-B1 EFNB1 , a marker of tissue boundary formation, cause craniofrontonasal syndrome.
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Nat Rev Neurosci. The normal human female as a mosaic of X-chromosome activity: studies using the gene for GPD-deficiency as a marker. Dissecting the molecular mechanisms in craniofrontonasal syndrome: differential mRNA expression of mutant EFNB1 and the cellular mosaic. Eur J Hum Genet. Cleft Palate Craniofac J. Hum Mutat , The origin of EFNB1 mutations in craniofrontonasal syndrome: frequent somatic mosaicism and explanation of the paucity of carrier males.
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