Encyclopedia
Blepharocheilodontic (BCD) syndrome is a disorder that is present at birth. It mainly affects the eyelids (blepharo-), upper lip (-cheilo-), and teeth (-dontic).
- genetic conditions
1. Introduction
People with BCD syndrome have lower eyelids that turn out so that the inner surface is exposed (ectropion). The outside of the lower lid may sag away from the eye (euryblepharon), and the eyelids may not be able to close completely (lagophthalmia). There can be extra eyelashes (distichiasis) on the upper eyelids, ranging from a few extra eyelashes to a full extra set. These eyelashes do not grow along the edge of the eyelid with the normal lashes, but out of its inner lining. When the abnormal eyelashes touch the eyeball, they can cause damage to the clear covering of the eye (cornea). Affected individuals may also have widely spaced eyes (hypertelorism), a flat face, and a high forehead.
Other features of BCD syndrome usually include openings on both sides of the upper lip (bilateral cleft lip) and an opening in the roof of the mouth (cleft palate). Affected individuals may have fewer teeth than normal (oligodontia) and their teeth are often smaller than usual and cone-shaped. The dental abnormalities affect both primary teeth (sometimes called "baby teeth") and secondary (permanent) teeth. Other frequent features include sparse, fine hair and abnormal nails.
Occasionally people with BCD syndrome have additional features, including an obstruction of the anal opening (imperforate anus); malformation or absence of the butterfly-shaped gland in the lower neck called the thyroid, resulting in lack of thyroid gland function; or fused fingers or toes (syndactyly). Very rarely, affected individuals have incompletely formed arms or legs (limb reduction defects) or a spinal cord abnormality known as spina bifida.
2. Frequency
BCD syndrome is a rare disorder; its prevalence is unknown. At least 50 affected individuals have been described in the medical literature.
3. Causes
BCD syndrome is caused by mutations in the CDH1 or CTNND1 gene. These genes provide instructions for making proteins called epithelial cadherin (E-cadherin) and p120-catenin, respectively. The E-cadherin protein is found within the membrane that surrounds epithelial cells, which are the cells that line the surfaces and cavities of the body, including the inside of the eyelids and mouth. This protein is involved in the attachment of cells to one another (cell adhesion). The p120-catenin protein helps keep E-cadherin in its proper place in the cell membrane, preventing it from being taken into the cell and broken down prematurely. Interactions between the two proteins are also important for other cell processes that are involved in the development of the head and face (craniofacial development), including the eyelids and teeth.
While the specific effects of the CDH1 gene mutations that cause BCD syndrome are not well understood, researchers suggest that the mutations may result in an E-cadherin protein that is unstable and quickly broken down. CTNND1 gene mutations reduce or eliminate the production or function of p120-catenin, so E-cadherin is broken down prematurely. A shortage of these proteins disrupts normal development, especially craniofacial development, which is thought to underlie the features of BCD syndrome.
4. Inheritance
This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.
In some cases, an affected person inherits the mutation from one affected parent. Other cases result from new mutations in the gene and occur in people with no history of the disorder in their family.
5. Other Names for This Condition
- BCD syndrome
- BCDS
- blepharo-cheilo-dontic syndrome
- blepharo-cheilo-odontic syndrome
- clefting, ectropion, and conical teeth
- ectropion, inferior, with cleft lip and/or palate
- Elschnig syndrome
- lagophthalmia with bilateral cleft lip and palate
This entry is adapted from the peer-reviewed paper https://medlineplus.gov/genetics/condition/blepharocheilodontic-syndrome
References
- Ababneh FK, Al-Swaid A, Elhag A, Youssef T, Alsaif S. Blepharo-cheilo-dontic(BCD) syndrome: expanding the phenotype, case report and review of literature. AmJ Med Genet A. 2014 Jun;164A(6):1525-9. doi: 10.1002/ajmg.a.36465.
- Ghoumid J, Stichelbout M, Jourdain AS, Frenois F, Lejeune-Dumoulin S,Alex-Cordier MP, Lebrun M, Guerreschi P, Duquennoy-Martinot V, Vinchon M, FerriJ, Jung M, Vicaire S, Vanlerberghe C, Escande F, Petit F, Manouvrier-Hanu S.Blepharocheilodontic syndrome is a CDH1 pathway-related disorder due to mutationsin CDH1 and CTNND1. Genet Med. 2017 Sep;19(9):1013-1021. doi:10.1038/gim.2017.11.
- Gorlin RJ, Zellweger H, Curtis MW, Wiedemann HR, Warburg M, Majewski F,Gillessen-Kaesbach G, Prahl-Andersen B, Zackai E. Blepharo-cheilo-dontic (BCD)syndrome. Am J Med Genet. 1996 Oct 16;65(2):109-12.
- Guion-Almeida ML, Rodini ES, Kokitsu-Nakata NM, Bologna-Amantini D.Blepharo-Cheilo-Dontic (BCD) syndrome: report on four new patients. Am J MedGenet. 1998 Mar 5;76(2):133-6.
- Valdéz-de la Torre MH, Quintana-García M, Canún S. Blepharo-cheilo-dontic(BCD) syndrome in two Mexican patients. Am J Med Genet. 1999 Jul 16;85(2):157-9.
- Weaver KN, Rutledge KD, Grant JH, Robin NH. Imperforate anus is a rareassociated finding in blepharocheilodontic syndrome. Am J Med Genet A. 2010Feb;152A(2):438-40. doi: 10.1002/ajmg.a.33207.
