Medicine:Oculodentodigital dysplasia
| Oculodentodigital dysplasia | |
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| Other names | Oculo-dento-digital syndrome, Oculodentodigital dysplasia , and Oculodentoosseous dysplasia |
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| Woman with oculodentodigital dysplasia | |
Oculodentodigital syndrome (ODD syndrome) is an extremely rare genetic condition that typically results in small eyes, underdeveloped teeth, and syndactyly and malformation of the fourth and fifth fingers. It is considered a kind of ectodermal dysplasia.
Signs and symptoms
People with ODD syndrome often have a characteristic appearance. Visible features of the condition include:[1]
- small teeth that are prone to dental caries because of underdeveloped tooth enamel;
- a long, thin nose;
- unusually small eyes; and
- type III syndactyly of the fourth and fifth fingers.
Iris atrophy and glaucoma are more common than average.[1] The size of the eyes often interferes with learning to read; special eyeglasses may be required. Hair may be fine, thin, dry, or fragile; in some families, it is curly.[2]
Neurologic abnormalities may be seen in adults. The neurologic changes may appear earlier in each subsequent generation[3] and can include abnormal white matter, conductive deafness, and various kinds of paresis,[4] including ataxia, spastic paraplegia, difficulty controlling the eyes, and bladder and bowel disturbances.[5][6][7]
Genetics
ODD is typically an autosomal dominant condition, but can be inherited as a recessive trait.[8] It is generally believed to be caused by a mutation in the gene GJA1, which codes for the gap junction protein connexin 43.[1] Slightly different mutations in this gene may explain the different way the condition manifests in different families. Most people inherit this condition from one of their parents, but new cases do arise through novel mutations.[9] The mutation has high penetrance and variable expression, which means that nearly all people with the gene show signs of the condition, but these signs can range from very mild to very obvious.[3]
Diagnosis
Epidemiology
The actual incidence of this disease is not known, but (As of 2002), only 243 cases had been reported in the scientific literature, suggesting an incidence of on the order of one affected person in ten million people.[5]
References
- ↑ 1.0 1.1 1.2 "A novel mutation in the GJA1 gene in a family with oculodentodigital dysplasia". Arch. Ophthalmol. 123 (10): 1422–6. 2005. doi:10.1001/archopht.123.10.1422. PMID 16219735.
- ↑ "A novel GJA 1 mutation in oculo-dento-digital dysplasia with curly hair and hyperkeratosis". Eur J Dermatol 16 (3): 241–5. 2006. PMID 16709485. http://www.john-libbey-eurotext.fr/en/revues/medecine/ejd/e-docs/00/04/18/FC/article.phtml.
- ↑ 3.0 3.1 "Linkage analysis narrows the critical region for oculodentodigital dysplasia to chromosome 6q22-q23". Genomics 58 (1): 34–40. 1999. doi:10.1006/geno.1999.5814. PMID 10331943.
- ↑ "Oculodentodigital dysplasia syndrome associated with abnormal cerebral white matter". Am. J. Med. Genet. 41 (1): 18–20. 1991. doi:10.1002/ajmg.1320410106. PMID 1659191.
- ↑ 5.0 5.1 "Neurological manifestations of the oculodentodigital dysplasia syndrome". J. Neurol. 249 (5): 584–95. 2002. doi:10.1007/s004150200068. PMID 12021949.
- ↑ "Oculodentodigital dysplasia with cerebral white matter abnormalities in a two-generation family". Am. J. Med. Genet. 57 (3): 458–61. 1995. doi:10.1002/ajmg.1320570320. PMID 7677152.
- ↑ "Connexin 43 (GJA1) mutations cause the pleiotropic phenotype of oculodentodigital dysplasia". Am. J. Hum. Genet. 72 (2): 408–18. 2003. doi:10.1086/346090. PMID 12457340.
- ↑ "A nonsense mutation in the first transmembrane domain of connexin 43 underlies autosomal recessive oculodentodigital syndrome". J. Med. Genet. 43 (7): e37. 2006. doi:10.1136/jmg.2005.037655. PMID 16816024.
- ↑ "Older paternal age and fresh gene mutation: data on additional disorders". J. Pediatr. 86 (1): 84–8. 1975. doi:10.1016/S0022-3476(75)80709-8. PMID 1110452.
External links
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